Chemical Engineering Basics

The units of the rate constant for a second order reaction are

The single most imortant requirement for a turbine blade material is

Moist climate is the most favourable factor in the site selection far a

__________ wire is never used for making the heating element.

Basic open hearth furnace (BOF) is not used for producing __________ steel.

Water flow in the river during flood can be categorised as the __________ flow.

__________ is a non volatile film forming constituent of a paint.

The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral?

Which of the following alloying elements when added in steel does not improve its lachinability?

Sudden immersion/dipping of red hot steel bar in water makes it

Fire in fuel gas pipelines is extinguished most effectively by

Boiling point of water gets lowered at high altitudes (e.g., hills), because

Desert air coolers being rendered ineffective in rainy season is due to

Auto collimator is used to check

About __________ ton of coke is required in a cupola to produce one ton of casting.

The most commonly used moderator in nuclear power plants is

Role of a "collector" in froth floatation is to

Pick out the wrong statement.

The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.

A reduction in thermal resistance during heat transfer does not occur in the

Catalyst used in the catalytic converter employed in automobiles to convert CO into CO 2 and for complete oxidation of un-burnt hydrocarbons is

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m.k) of 15 mm diameter exposed to air (h = 20W/m 2 .k), when the insulation thickness is __________ mm.

Which of the following is prone to cup and cone fracture?

In the diving apparatus, helium is used along with oxygen, because it is

The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.

On-off control

Which of the following is an unconventional source of energy ?

Refrigerative cooling employed during long distance transportation of food stuffs is normally done by

Machine tool bodies are usually made of

Increase in the entropy of a system represents the

Spherical shape of mercury droplets is due to its

Which of the following polymers is obtained by copolymerisation of three monomers?

Metalloids . . . . . . . .

Temperature attained in soldering of metals is about __________ °C.

Methyl orange indicator turns

When an isolated thermodynamic system executes a process,

In chemical dehumidification process

In a fuel cell, chemical energy is converted into

Out of the following surfaces, the emis-sivity will be minimum for

Which set of materials is used as a moderator in nuclear reactor?

Factor of safety is the ratio of the __________ stress to the working stress.

Electrolytic reduction cell used for conversion of calcined Al 2 O 3 to Al is a carbon lined furnace operating at 800 - 900°C. The purpose of electric current supplied to the furnace is to

In radiative heat transfer, a grey surface is the one, which has

Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.

Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.

High speed steel tools retain their hardness upto a temperature of __________ °C.

Super conduction in metals is observed at a temperature of __________ °K.

Rain drops falling through atmospheric air attain limited terminal velocity, because of

The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system

Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation

Tip of the match stick contains a mixture of

A friction lighter is normally used for lighting gas welding torch, because of the reason that

Gratings is associated with the measurement of

Nickel is a __________ material.

Coarse grained steels have

Colloids can be purified by

An oxidation process is accompanied with decrease in the

A reduction process is accompanied with increase in the

Ceramic compounds as compared to metallic compounds

Which of the following gases cause global warming?

Principal alloying element in Elinvar (used for making hair springs for watches) is

The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

The life of a ball bearing is inversely proportional to

Boiler rating is normally done in terms of

Which of the following is not an ore of aluminium?

Matte smelting is used in the extraction of

Which of the following material handling equipments is not suitable for moving materials in varying paths?

Earing is a defect found in steels after the following metal working operation (s).

A boy weighing 110lb climbs up a 50 ft high vertical destination in 100 seconds. Horse power of the boy is __________ hp.

Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.

The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10 -16 m 2 .S -1 and it is 1.94 × 10 -14 m 2 .S -1 at 1200 K. The activation energy (in k.J.mole -1 ) for the diffusion of Ni in Cu is

Hoope's cell is predominantly used for the electrolytic refining of

Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same

'Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction.

Internal cracks in drawn bars are due to

RADAR is

All modes of heat transfer i.e., conduction, convection & radiation occur in case of the

Usual value of the resistance suitable for a wire resistance strain gauge is __________ ohms.

The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature.

The term 'Value' in value engineering technique refers to the __________ cost of the product.

On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.

__________ can not be forged.

Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.

Production of one ton of steel plate in a modern integrated steel plant in India consumes about __________ kWh of electricity.

The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.

Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.

In multipass welds, shot peening is done after each pass to

Preheating prior to welding is done for the purpose of

The product (s) of roasting of a sulphide ore is (are)

Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?

Which of the following pair is correctly matched?

A material having good damping property is likely to have

The swift cup test evaluates the following property of a sheet metal.

Shock resisting steels should possess high

Which of the following parameters is actually measured during tensile testing of a specimen using Universal testing machine?

__________ rubber is generally used for making 'O' rings used for vacuum sealings.

Which of the following has the highest modulus of elasticity (about 7 × 10 6 kg/cm 2 )?

Pick out the correct statement.

Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of

Addition of silicon to aluminium improves its

In continuous casting of liquid steel, the mould is made of

The surface tension of a liquid, at critical temperature is

Identify the false statement

Fatigue life is expected to increase by

In chemical dehumidification of air

Liquid nitrogen containers can be made from

According to thermodynamic Farenhite scale, the fundamental interval between ice point to steam point is

Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be

If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity

Saturated steam at a pressure of 25 kg/cm 2 is throttled to attain 5 kg/cm 2 . Then the outcoming steam will be

The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.

Addition of __________ to steel can not impart it high strength at elevated temperature.

Lead percentage in pure galena is about

When a copper ball is heated, the largest percentage increase will be in its

__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

Hydrogen in liquid steels is dissolved

Laser welding is widely employed in the __________ industries.

Air refrigeration cycle is used in the air crafts, because of

Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?

Frost formation on the evaporator tubes in the domestic refrigerators

Milk is fat dispersed in water. It is an example of

The velocity of sound in air is independent of changes in its

The most important material handling system in an integrated steel plant is the

Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

Puddling process is used for converting pig iron into

Between 230°C and 370°C, blue brittleness is caused in mild steel because of the

Metal shots used in shot blasting are made of

Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ?

Fibrous fracture is normally encountered in the __________ materials.

Wood is a/an __________ material.

Lead is most readily dissolved in

Holes in a plate for rivetted joints is preferably made by

Hard magnetic materials have high

Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8

Which of the, following is not associated with the functioning of a petrol engine ?

With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.

Which of the following fastening devices has a head at one end and a nut fitted to the other?

Evaporative cooling process employs a combination of cooling and humidification in which the

Difference at any instant between the value of the controlled variable and the set point is called the

A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.

Large scale fire on fuel gas line is normally extinguished by

Theoretical volume of oxygen required for complete combustion of 1 Nm 3 of acetylene, in oxy-acetylene welding is __________ Nm 3 .

Annealing of a material does not

Multistage compression is necessary for high efficiency,

Water-tube boiler is the one, in which

The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.

Resilience of a bolt can be increased by increasing its

The temperature at which a gas, when subjected to Joule-Thomson expansion, neither cools or heats up, is termed as the __________ temperature. Above this temperature the gas heats up on throttling and below this the gas cools down.

Unit molar solution of __________ is the best conductor of electricity.

Lead is poured into the joint between two- __________ pipes.

The hardenability of steel decreases with

Which of the following phenomenon will exhibit the minimum heat transfer?

__________ are normally subjected to sub-zero treatment.

Blast furnace is a

Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)

Expansion device used in a window air-conditioner is a/an

With increase in annealing temperature, the following defect density decreases.

Which of the following has the least oili-ness ?

Which of the following is a permanent fastening?

Which of the following is a synthetic abrasive ?

Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?

In __________ process, there is an increase in entropy with no degradation of energy.

Wrought iron does not have

Wrought iron does not have the

Inspection of surface and sub-surface cracks in non-magnetic alloys is done by __________ testing method.

For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ?

In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :

Milligram of KOH required to saponify 1 gm of oil is called its __________ number.

A controller action in which there is a con-tinous relation between the values of controlled variable and the rate of change of conrolled output signal is called the __________ action.

Angular displacement can be measured suitably by a

Cold cracking in the heat affected zone of a high strength steel weld can take place because of the

Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ?

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is

Function of feed check valve in a boiler is to

Mechanism/phenomenon involved in the improvement of fatigue strength of a material by shot peening is the

__________ test is the appropriate test to determine whether a material is ductile or brittle.

The capacity of a material to absorb energy depends upon both its strength & stiffness. The term 'stiffness' of a material is the opposite of its

__________ can not increase the fatigue strength of a material.

Austempering process results in the formation of __________ structure.

Primary designation of steel is based on its

Dislocations are __________ defects.

Which of the following are considered applications of ultrasonic testing ?

The most commonly used moderator in nuclear power plant is

With increase in pressure, the saturation temperature of steam

Which of the following has the highest density and the lowest melting point ?

Machinability of hard alloys and tool steels is improved by

In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be

Annealing of cast iron

The dimensions of Planck's constant is the same as that of the

Sulphur is melted in the sulphuric acid plant most commonly by employing

With increase in carbon percentage in steel, its

Coating provided on the electrodes used in the arc welding is not expected to

Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?

Machinability of hard alloys & tool steels is improved by

The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.

Gas turbine normally employs a constant __________ cycle.

The substance used as a smoke screen in warfare is

Old cycle handles are coated with nickel using

The activity of pure hydrogen gas at 1000°C and 5 atm pressure

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher

A common disinfectant used in village wells for disinfection of water is

Use of water as a manometric liquid suffers from the disadvantage of its

Which of the following metals can not be hot worked at room temperature?

Improvement in mechanical properties of metals in its hot working is due to the grains

High __________ of cast iron makes it suitable for use in machine beds.

__________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material.

Duralumin is an alloy of aluminium and copper. Percentage of copper in duralumin is

Stainless steel is welded using

Pick out the wrong statement about the machinability of metals. Machinability of a metal

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

Temper brittleness of a material can be fairly detected by the __________ test.

Hardening of steel is not possible, unless it is heated __________ critical point.

Presence of sulphur in steel reduces the

For the Stoke's law to be valid in the case of a falling sphere in a fluid, the

'Ice point' is designated on Farenhite temperature scale by

Safety matches is produced using

A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m 2 . The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m 2 °C.

Material having negative co-efficient of linear expansion is

Fine grained steels have

Floating control action

Styrofoam is the commercial name of

Which of the following is an inedible oil ?

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Change in volume of metals from absolute zero temperature to their melting points is

The most serious manufacturing defect from fracture toughness point of view is

Unit of surface tension in S.I. unit is

Limestone is added in the blast furnace (during pig iron manufacture) to

The following thermocouple may be used for measuring temperature upto 1873°K.

Pick out the correct combination about the role of various additives used in polymers.

Which of the following does not discharge the dust collected as a dry solid?

All of the following alloying elements of steel increases hardness but sacrifice ductility, except

Chlorine acts as a bleaching agent only in the presence of

During sensible cooling of air, its wet bulb temperature

The best criterion for analysing an economic investment is the

Atomic __________ of an element is a whole number.

Specific heat of an ideal gas depends upon its

Rankine cycle comprises of two isothermal and two __________ processes.

__________ iron is produced by the annealing of white cast iron.

Brinell Hardness Number (BHN) for talc is approximately in the range of

Gantt charts are used for streamlining the

Materials having __________ lattice structure are usually the most ductile.

A pipeline buried in soil is commonly protected from corrosion by

Which of the following is not the commercial name of polymethyl-methacrylate (PMMA)?

The routing function in a production system design is concerned with the

What is the percentage of chromium in 18-4-1 high speed steel?

Which is the most suitable joint for the pipes, with are laid submerged under water, where the bottom of the river bed is uneven?

In an eutectic system, two elements are completely

Unbreakable crockeries are made from __________ polymers.

Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.

An engineer's hammer is made of high __________ steel.

Magnesium is present in

Thermistors are used in __________ devices.

More than 1000 tons refrigeration capacity plants are usually of __________ type.

The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.

Addition of __________ in steel can help in increasing the depth of hardness.

A solar cell converts the sunlight directly into __________ energy.

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

In case of fluid moving machineries, the relationship between saturation temperature and pressure decides the process of

Which of the following materials has the poorest electrical conductivity?

Material having maximum density is

A hot short metal is

Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.

A static fluid can not have

Percentage of differential pressure lost in a venturimeter with a tapering of 15° may be about

Maximum permissible air velocity in pipelines is about __________ metre/second.

Aluminium oxide (an abrasive) is used for grinding

For infinite parallel planes having emis-sivities $${{varepsilon _1}}$$ & $${{varepsilon _2}}$$, the interchange factor for radiation from surface 1 to surface 2 is given by

In case of simple harmonic motion, displacement is proportional to the

The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is

The path and movements followed by men, materials & equipments in executing the activities is indicated by the

Boiler tube size is specified by its thickness and __________ diameter.

Break even point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost

Direct conversion of thermal energy to electrical energy is facilitated by the

Which of the following approaches the ideal gas behaviour most closely?

Heat treatment of steel is done mainly to change its

Fire on fuel oil lines can be extinguished by

__________ property of steel increases by addition of large amount of silicon in it.

LASER

Laser is a device to produce

Superheating of steam is done at constant

Gas carrying pipelines are best joined by

Out of the following, the rays having the lowest wavelength is the

In Newton's law of viscosity, which states that the shear stress is proportional to the __________ co-efficient of viscosity is called dynamic or absolute viscosity (where, V = velocity, $${{ ext{V}}_{ ext{g}}}$$ = velocity gradient).

Galena is an ore of

Galvanic corrosion

Volumetric composition of flue gas analysed with the Orsat apparatus is : CO 2 = 12%, O 2 = 8%, CO = nil, N 2 = 80%. This flue gas composition indicates that

Age hardening is connected with

The main charge in blast furnace is usually

In sheet metal forming, stretcher strains occur in

Heat treatment of steel is done to mainly change its __________ properties.

Current employed in resistance welding ranges from __________ kVA/cm 2 .

High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.

Fatigue strength of a metal is improved by

In practice, the compression ratio of compression-ignition (CI) engine ranges from

Energy of the sun arises mainly from __________ reactions.

The specific gravity of coal depends mainly on its __________ content.

A __________ type pressure sensing element is commonly used in aneroid barometer.

No cutting fluid is normally used, while machining

Thermal conductivity of a material does not depend upon its

Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.

Which of the following is termed as the boiler mounting ?

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

Window panes of aeroplanes are normally made of

Viscoelastic behaviour is observed in __________ materials.

The value of $$gamma = frac{{{{ ext{c}}_{ ext{p}}}}}{{{{ ext{c}}_{ ext{v}}}}}$$ xa0at < 500°C for air & most common gases can be safely assumed to be

Electrolytes conduct electric current by

Copper is not present as an alloying constituent in

Kinematic viscosity of water as compared to that of air is

Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.

__________ test can be termed as the semi-distructive test.

A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec 2 is

The weight of a body at the centre of the earth is

The efficiency of a Carnot heat engine operating between absolute temperatures T 1 and T 2 (when, T 1 > T 2 ) is given by $$frac{{{{ ext{T}}_1} - {{ ext{T}}_2}}}{{{{ ext{T}}_1}}}.$$ xa0The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T 1 and T 2 is given by

Lead is poured into the joint between two __________ pipes.

Lead is poured into the joints between two __________ pipes.

Free oxygen is removed from boiler feed water, because it

Use of flux during soldering is done to

Internal energy of a gas obeying Van-Der-Wall's equation of state, $$left( {{ ext{p}} + frac{{ ext{a}}}{{{{ ext{v}}^2}}}}
ight)left( {{ ext{V}} - { ext{b}}}
ight) = { ext{RT,}}$$ xa0 xa0 depends upon its

The quantity of electricity required to deposit one gm equivalent of any substance is one

Feed check valve is used in steam boilers to

Function of blow down valve in a boiler is to

Draft allowance given to patterns is for

Potable water means the water used for

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm 3 ) while the C.V. is same on weight basis (i.e., kcal/kg)?

The phenomenon of weld decay is found in case of

A floating body oscillates about its __________ when it is displaced slightly.

Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than

Uniform ramming of sand in green sand moulding process leads to

Pick out the wrong statement. Termination of polymerisation reaction occurs, if the

Statistical quality control was developed by __________ , an American scientist during world war II.

Most important property of steels for use in automobile bodies is the

The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.

In a titration involving weak acid and strong base, the preferred indicator is

Projection welding & stud welding is categorised as the __________ welding.

Filler metal is not used in the __________ welding.

A freely floating object is stable, if its centre of buoyancy

__________ welding will be the most suitable for butt welding two 20 cms thick boiler drum mild steel plates.

An atom bomb works on the principle of

Damage to metal surface by mechanical action is called

Screws are specified by their __________ diameters.

The following is a typical anionic collector used in flotation.

With increase in compression ratio, the volumetric efficiency of air compressor

The thickness of oxide film is y at time t. If K 1 , K 2 and K 3 are the temperature dependent constants, the parabolic law of oxidation is given by

What is the range of tempering temperature (°C) for most of the materials ?

Streaklines, streamlines & pathlines are almost identical for __________ fluid flow.

__________ stress can not be sustained by a fluid in equilibrium.

Needles are produced by

Which of the following accounts for maximum loss of energy in a coal fired boiler?

An ideal material for making cooking vessels should have

Leakage in a cooking gas cylinder is detected by

Secondary hardening in steels arises out of the

Which of the following is not a natural abrasive?

__________ has the highest melting point out of the following.

The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

In hot working, dynamic recovery occurs in

Lap joints are preferred over butt joints in soldering/brazing, because these joints are

α-rays are

In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be

__________ is the most suitable lubricant for drawing mild steel wires?

Maraging steels derive their strength from the following mechanism:

Ignition of fuel in a diesel engine is by

Blast furnace slag is mainly molten

Paint spray gun works on the principle of

For the irreversible reaction, C a + 2C = C a C 2 , ΔH°298 = -60000 J.mole -1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be

__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

Which of the following welding processes employs the highest welding temperature ?

Which of the following is a boiler accessory i.e., not a boiler mounting ?

The capital & running costs of similar machines having unequal service life can be compared by the __________ method.

Carburettor in a spark ignition engine is used to

A spark ignition petrol engine has

__________ joint is mostly used for joining pipes carrying water at low pressure.

Quartz is a __________ material.

In cold working of metal as compared to its hot working

Cast iron has the unique property of high

Which of the following is the terminology used for the temperature at which the phase changes occur in a metal ?

Ceramic tips for the cutting tool are prepared from __________ powder.

Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when

The most suitable material for a sewer for carrying storm water is

If Reynolds number is greater than 1, then the

Property responsible for the talcum powder to cling to the skin is the

Increasing the temperature of a material makes it

Which of the following alloying elements is present in maximum percentage in high speed steel.

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

Value of a material is usually considered as a relationship between

Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

Satellites burn off during re-entry to earth's atmosphere, because of the

Which of the following is used to produce draught in the locomotive boilers ?

Hydrocyclone is a

Hydrogen can be

In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is

In inventory control theory, the economic order quantity (EOQ) is the

Gross & Net calorific values will be the same for

Tumbling is the process of improving the __________ of the materials/parts.

Natural water contains approximately __________ percent of heavy water.

According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.

Isotropic materials have the same __________ in all the directions.

Insulation of liquid surface can be achieved by __________ on top of its surface.

The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material.

A fluid is termed as the Newtonion fluid, when the shear stress is __________ the velocity gradient.

On being hit with a hammer, __________ will readily fracture.

When metals are heated to high temperature, their __________ increases in general.

The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.

Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of

Steam condenser tubes are made of ad-mirability brass, in which percentage of zinc & copper are __________ respectively.

In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.

CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the

Batch process is preferred over continuous process, when the

Transformer cores are normally made from

The co-ordination number in simple cubic structure is

L.D. (Linz-Donawitz) converter is used in the production of

The excess air required for the combustion of pulverised coal is of the order of about __________ percent.

Cast iron compared to steel is better in

With increase in temperature, the electrical conductivity of semiconductors

Constituents of stellite are

__________ is not used as a material of construction in thermocouples.

Ganister contains maximum percentage of

In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases

Corrosion is

Aromatics are desired constituents of

The product out from a cupola is called

Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?

Dephosphorisation of molten pig iron is favoured by

Commonly used flux for brazing is

For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

Air-petrol ratio in an automotive petrol engine is around

A balanced draught boiler furnace employs __________ draught fan.

The normal stress is the same in all directions at a point in a fluid, only when the fluid

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is

__________ of test specimens is not involved in any hardness testing method.

The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as

Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is

Notched bar test is used for testing the __________ of a material.

There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.

Air standard Otto cycle is more efficient than the diesel cycle for the same

Out of the following, the dimensionless quantity is

Load cells used for the measurement of weight has

__________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.

The main function of the deaerator used in the thermal power plant is to

Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to

X-rays do not exhibit the property of

Dowtherm is a

Often earing defects are found during deep drawing operation, because the

Drills are usually made of

Which drug is made from vegetables ?

Titanium is produced by __________ of TiCl 4 .

Globular form of cementite is formed during the __________ process.

The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.

Dew point temperature always gives an indication of the __________ of the moist air.

Absolute zero pressure can be attained at a temperature of

Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore?

Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?

Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

Fog is an example of colloidal system of

Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.

Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel.

The underground well of a biogas plant is called the

Heat required to raise the temperature of a body by 1°C is called its

Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

Wavelength of radiation emitted by a body depends on the __________ of its surface.

Cementite is in the lamellar form in the __________ phase of steel.

Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.

The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the

Which of the following is a weak acid?

The 'laughing gas' is

Out of the following, __________ pipe is the least corrosion resistant.

Out of the following, the most melleable material is

What happens, when SO 2 is passed through a solution of H 2 S in water?

Which of the following is the most suitable abrasive for grinding high tensile strength materials?

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?

Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of

The primary strengthening mechanism in 70 : 30 brass is the

Which of the following hardness tests uses the depth of penetration caused by the indentor as the parameter for arriving at the hardness value of a material ?

The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?

Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.

The pH value is the measure of hydrogen ion concentration in a solution. The term pH stands for the __________ in the solution.

When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.

A pycnometer is used for the measurement of

Filler metal is used in __________ welding.

A colloidal system, in which a liquid is dispersed in gas is called a/an

Disposable patterns are made of

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x 0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.

If a solid is compressed adiabatically in its elastic range, its __________ remains constat

The product of a commercial direct reduction process is

__________ flux is used for the extraction of metal from its self fluxing ores.

Metals in general have a low value of thermal

The machanism involved in the removal of metal in drilling operation is by

Spheriodising of a material is a/an __________ process.

Good design of the casing of a centrifugal pump aims at minimising the

The maximum axial compression stress during cold upsetting of a cylinderical rod of radius (r) occurs at

Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.

Fahrenheit and Centigrade scales have the same readings at

A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution.

Yield strength of a material is determined by the __________ test.

Work done by a/an __________ process is determined by ∫p.dV.

The cathode in an electrochemical cell always carries

Rockwell number represents the

Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

Steel & cast iron pipes are produced by __________ casting.

Electric arc furnace is employed mainly for the production of __________ steel.

Powder metallurgy technique is used in the production of __________ tools.

Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines?

Babbit lining is used on brass/bronze bearings to increase the

Consideration of the creep is the most important in case of the

Creep consideration is the most important in case of the

On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is

Which of the following metals is the most prone to work hardening?

__________ is not a case hardening process.

__________ is not a heat treatment process.

Nitrogen is not an essential component of

What is the value of included angle of a triangular notch for maximum discharge ?

Pick the odd man out of the following.

Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.

The driving force for the sintering of a powder compact is

The moment of inertia of a body comes into play in __________ motion.

Overheating of satellites during re-entry to earth is controlled by

Ferromagnetic material owe their properties to __________ inner sub-shells.

Which of the following mainly decides the current to be employed is arc welding?

The delivery pressure of boiler feed water pump compared to the boiler steam pressure is

The radioactive isotope of hydrogen is

In the floatation process, pine oil is used as the

Normalising does not __________ of a metal.

Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.

A high pressure boiler generates steam at a pressure greater than __________ kg/cm 2 .

For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

Electrochemical corrosion occurs

The Al 2 O 3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent.

'End cooler' or 'after cooler' is employed in air compressor mainly to

Cathodic protection is widely used in controlling corrosion in

The hardness of the lathe bed material is measured by the

Hot & cold working of material causes its __________ deformation.

__________ of austenite decreases the hardenability in steel.

The starting of a car takes time in winter, because the

The critical pressure at which the latent heat of vaporization of steam becomes zero is __________ Kg/cm 2 .

As the fluid flow rate increases, the float of the rotameter

The rolling process can not be used to produce

Multistage compression of air as compared to single stage compression offers the advantage of

Water hammer in pipelines results, when the flowing fluid

Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore?

The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : C p of copper is 23 J.K -1 mole -1 )

While the recrystallisation temperature for pure metals is 0.3 T m , the same for alloys is equal to __________ × T m (where, T m Melting temperature).

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m 2 .°K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

M10 index of coke indicates its

Heat flow across a hollow sphere of inner radius 'r 1 ' and outer radius 'r 2 ' is directly proportional to

The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.

The power of a low capacity prime mover is most suitably measured by a __________ type dynamometer.

Which of the following is not a charge material for cupola ?

To counteract the bad effects of strain hardening on a cold formed part, it must be

A good abrasive

The fugacity of liquid water at 298 K is approximately 3171 P a . Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be

With increase in temperature, the electrical conductivity of a __________ decreases.

The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then

In 18-4-1 high speed steel, 18, 4 & 1 respectively denote the percentage of

Property of a material to resist a tensile force without giving away is a measure of its

A material being tested for endurance strength is subjected to the __________ load.

As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint.

Killed steels

Hot working of lead is carried out at

An "orange peel" effect is observed

The tensile strength of plastics ranges from __________ kg/mm².

Cobalt-60 is used as a source of __________ in medical therapy & industrial radiography.

Device used as a standard for the calibration of pressure gauges is a

Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C.

Hot extrusion of aluminium is done in the temperature range of __________ °C.

A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its

Which of the following rays has the least wavelength?

A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm 2 .

Normalising of a casting does not

Normalising of an object does not

__________ is not used as the control rod material in a nuclear reactor.

Young's modulus of a material is the measure of its

__________ is the hardest material out of the following.

Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.

Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?

Which of the following is not a principal alloying element for the structural steel?

Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and

Presence of small quantity of sulphur in low carbon steel improves its

A suitable lubricant used for watches is

The approximate height of a blast furnace having a useful volume of 2000 m 3 is about __________ metres

Materials used for making permanent magnets containing iron and nickel are made by __________ technique.

Tempering of a material does not improve its

In age-hardenable alloys, maximum ductility is obtained

Which of the following materials has the maximum shrinkage allowance ?

Powder metallurgy is used to produce

A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.