Engineering Thermodynamics

Addition of heat at constant pressure to a gas results in

Which of the following items is not a path function?

An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is

The absolute zero pressure can be attained at a temperature of

Molecular volume of any perfect gas at 600 × 10 3 N/m 2 and 27°C will be

For the same maximum pressure and temperature,

Mixture of ice and water form a

The entropy may be expressed as a function of

A molecule consisting of one atom is known as

The ratio of molar specific heats for mono-atomic gas is

When the gas is cooled at constant pressure,

The specific heat at constant volume is

Which of the following is the correct statement?

In an isothermal process,

Which is the incorrect statement about Carnot cycle?

One kilowatt is equal to

Which of the following is correct?

One Joule (J) is equal to

Reversed joule cycle is called

The entropy __________ in an irreversible cyclic process.

The pressure of a gas in terms of its mean kinetic energy per unit volume 'E' is equal to

The efficiency of Diesel cycle approaches to Otto cycle efficiency when

The heat energy stored in the gas and used for raising the temperature of the gas is known as

According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.

In an isothermal process, the internal energy

Calorie is a measure of

Kerosene is distilled at

Carnot cycle efficiency depends upon

The expansion ratio (r) is the ratio of (where v 1 = Volume at the beginning of expansion and v 2 = Volume at the end of expansion)

The gas turbine cycle with regenerator improves

The efficiency of a Carnot engine depends on

Which of the following statement is incorrect?

Thermal power plant works on

Which of the following is the property of a system?

Which law states that the specific heat of a gas remains constant at all temperatures and pressures?

The temperature at which the volume of a gas becomes zero is called

In a steady flow process, the ratio of

The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

Which of the following processes is irreversible process?

The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

A diathermic wall is one which

An adiabatic wall is one which

The polytropic index (n) is given by

Minimum work in compressor is possible when the value of adiabatic index ‘n’ is equal to

Which of the following cycles has maximum efficiency?

No liquid can exist as liquid at

A sudden fall in the barometer reading is a sign of approaching

If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly

A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is

One molecule of oxygen is __________ times heavier than the hydrogen atom.

The oxygen atom is ________ times heavier than the hydrogen atom.

Heat and work are

During throttling process

Universal gas constant is defined as equal to product of the molecular weight of the gas and

The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when

The fuel mostly used in cement industry and in metallurgical processes is

One kg of carbon monoxide requires _________ kg of oxygen to produce $$frac{{11}}{7}$$ kg of carbon dioxide gas.

The heating of a gas at constant pressure is governed by

One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to

Charle's law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.

When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is

Which of the following cycles is not a reversible cycle?

Which of the following is an irreversible cycle?

In an extensive property of a thermodynamic system

The more effective way of increasing efficiency of Carnot engine is to

The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents

Kelvin-Planck’s law deals with

The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227°C and 27°C. His claim is

Characteristic gas constant of a gas is equal to

The variables which control the physical properties of a perfect gas are

According to Avogadro's Hypothesis

The following cycle is used for air craft refrigeration

In closed cycle gas turbine, the air is compressed

A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is

The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.

For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

Select the wrong statement

The change of entropy, when heat is absorbed by the gas, is

When gas is heated at constant pressure, the heat supplied is utilized in

Superheated vapour behaves

Which of the following statement is correct?

The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as

Which of the following process can be made reversible with the help of a regenerator?

The value of 1 mm of Hg is equal to

The efficiency of Joule cycle is

A mixture of gas expands from 0.03 m 3 to 0.06 m 3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

Zeroth law of thermodynamics

First law of thermodynamics

According to first law of thermodynamics

According to Clausius statement of second law of thermodynamics

The statement that molecular weights of all gases occupy the same volume is known as

In a no flow reversible process for which p = (-3V + 15) × 10 5 N/m 2 , V changes from 1 m 3 to 2 m 3 . The work done will be about

The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents

The main cause for the irreversibility is

The isothermal and adiabatic processes are regarded as

An adiabatic process is one in which

Isochoric process is one in which

Kelvin Planck's law deals with

Kelvin-Planck's law deals with

The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

Intensive property of a system is one whose value

Extensive property of a system is one whose value

A perpetual motion machine is

Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?

In order that a cycle be reversible, following must be satisfied

The standard value of atmospheric pressure taken at sea level is

Which law states that the internal energy of a gas is a function of temperature?

The term N.T.P. stands for

First law of thermodynamics deals with

The value of n = 1 in the polytropic process indicates it to be

The general gas energy equation is (where $${{ ext{Q}}_{1 - 2}}$$ = Heat supplied, dU = Change in internal energy and $${{ ext{W}}_{1 - 2}}$$ = Work done in heat units)

Otto cycle consists of following four processes

According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.

The natural petroleum may be separated into

One kg of carbon requires $$frac{4}{3}$$ kg of oxygen and produces ________ kg of carbon monoxide gas.

One kg of carbon requires $$frac{4}{3}$$ kg of oxygen and produces __________ kg of carbon monoxide gas.

For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be

Properties of substances like pressure, temperature and density, in thermodynamic coordinates are

Which of the following processes are thermodynamically reversible?

Entropy change depends on

Coke is produced

When a gas is heated at constant pressure

The fuel mostly used in steam boilers is

Water contained in a beaker can be made to boil by passing steam through it

For which of the following substances, the internal energy and enthalpy are the functions of temperature only

The mass of flue gas per kg of fuel is the ratio of the

An open cycle gas turbine works on

One watt is equal to

If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to

The specific heat of air increases with increase in

The sum of internal energy (U) and the product of pressure and volume (PV) is known as

The gas constant (R) is equal to the

The __________ is obtained when carbonization of coal is carried out at 500° to 700° C.

When a gas is heated at constant volume

In a reversible adiabatic process, the ratio of $$frac{{{{ ext{T}}_1}}}{{{{ ext{T}}_2}}}$$ is equal to

The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).

The processes occurring in open system which permit the transfer of mass to and from the system, are known as

Which of the following is not the intensive property?

To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is

When the gas is heated at constant pressure, the heat supplied

When the gas is heated at constant volume, the heat supplied

Kinetic theory of gases assumes that the collisions between the molecules are

According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.

The efficiency of Stirling cycle is __________ Carnot cycle.

The efficiency of Ericsson cycle is __________ Carnot cycle.

The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.

For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.

Diesel cycle consists of __________ processes.

When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.

The throttling process is __________ process.

The atomic mass of nitrogen is __________ oxygen.

A tri-atomic molecule consists of __________ atoms.

The first law of thermodynamics is the law of

Stirling and Ericsson cycles are

The behavior of super-heated vapour is similar to that of

Which of the following has the minimum atomic mass?

The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is

The value of gas constant (R) in S. I. units is

In an ideal gas turbine plant, it is assumed that the compression and expansion processes are

The hard coke is obtained when carbonization of coal is carried out at

The unit of energy is S. I. units is

The universal gas constant (or molar constant) of a gas is the product of

In a free expansion process,

The efficiency of the Carnot cycle may be increased by

Carnot cycle efficiency is maximum when

The efficiency of Diesel cycle depends upon

The work ratio of simple gas turbine cycle depends upon

The efficiency of Carnot cycle depends upon

One kg of hydrogen requires 8 kg of oxygen and produces

One kg of carbon monoxide requires $$frac{4}{7}$$ kg of oxygen and produces

A cycle consisting of two constant pressure and two isentropic processes is known as

A cycle consisting of two adiabatic and two constant pressure processes is known as

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will

The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

Absolute zero pressure will occur

In a free expansion process

The ratio of two specific heats of air is equal to

One kg of carbon produces ________ kg of carbon dioxide.

The calorific value of gaseous fuel is expressed in

The efficiency of Diesel cycle increases with

The efficiency of Carnot cycle is maximum for

Boyle's law i.e. pV = constant is applicable to gases under

The state of a substance whose evaporation from its liquid state is complete, is known as

For a perfect gas, according to Boyle’s law (where p = Absolute pressure, v = Volume and T = Absolute temperature)

For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume and T = Absolute temperature)

A closed system is one in which

An isolated system is one in which

An open system is one in which

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is

The principal constituents of a fuel are

The compression ratio is the ratio of

The gas constant (R) is equal to the __________ of two specific heats.

When the expansion or compression takes place according to the law pvn = C, the process is known as

If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as

In an irreversible process, there is a

Second law of thermodynamics defines

Which of the following variables controls the physical properties of a perfect gas?

Which of the following laws is applicable for the behaviour of a perfect gas?

The ultimate analysis of coal consists of the determination of the percentage of

Which of the following is the lightest and most volatile liquid fuel?

Which of the following gas is mostly used in town for street and domestic lighting and heating?

According to Avogadro’s law

According to Avogadro's law

The efficiency and work ratio of a simple gas turbine cycle are

Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure

Which of the following quantities is not the property of the system?

Carnot cycle has maximum efficiency for

Compressed air coming out from a punctured football

The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s 2 . The absolute pressure in the vessel is

Total heat of a substance is also known as

Otto cycle is also known as

The entropy of water at 0°C is assumed to be

According to kinetic theory of gases, the absolute zero temperature is attained when

Energy can neither be created nor destroyed but can be converted from one form to other is inferred from

The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called

In an isothermal process, the internal energy of gas molecules

The absolute zero pressure will be

According to which law, all perfect gases change in volume by $${frac{1}{{273}}^{{ ext{th}}}}$$ of their original volume at 0°C for every 1°C change in temperature when pressure remains constant

Which of the following gas has a minimum molecular mass?

The atomic mass of oxygen is

For the same compression ratio, the efficiency of dual combustion cycle is

The heating of gas at constant volume is governed by

The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

Which of the following is the extensive property of a thermodynamic system?

Which of the following is an intensive property of a thermodynamic system?

According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

The energy of molecular motion appears as

One kg of ethylene (C 2 H 4 ) requires 2 kg of oxygen and produces $$frac{{22}}{7}$$ kg of carbon dioxide and __________ kg of water or steam.

1 kgf/cm 2 is equal to

Work done is zero for the following process

The fuel mostly used in blast furnace for extracting pig iron from iron ores is

On weight basis, air contains following parts of oxygen

On volume basis, air contains following parts of oxygen

A gas is compressed in a cylinder by a movable piston to a volume one half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be

Gases have

According to Dalton's law, the total pressure of the mixture of gases is equal to

When a gas is heated, change takes place in

The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

Work done in a free expansion process is

Work-done in a free expansion process is

The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is

According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

The heat and mechanical energies are mutually convertible. This statement was established by

Mond gas is obtained by

Producer gas is obtained by

In open cycle gas turbine plants

The atomic mass of sulphur is

When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

All perfect gases change in volume by $${frac{1}{{273}}^{{ ext{th}}}}$$ of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called

Which of the following statement is wrong?

A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as

The process is adiabatic, if the value of n in the equation pv n = C, is

First law of thermodynamics furnishes the relationship between

The measurement of a thermodynamic property known as temperature is based on

Measurement of temperature is based on

The basis for measuring thermodynamic property of temperature is given by

The absolute zero temperature is taken as

One kg of carbon produces __________ kg of carbon dioxide.

If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be

The air standard efficiency of an Otto cycle is given by (where r = Compression ratio and $$gamma $$ = Ratio of specific heats)

Work-done during adiabatic expansion is given by (where p 1 , v 1 , T 1 = Pressure, volume and temperature for the initial condition of gas, p 2 , v 2 , T 2 = Corresponding values for the final condition of gas, R = Gas constant and $$gamma $$ = Ratio of specific heats)

According to First law of thermodynamics,

According to Kelvin-Planck’s statement of second law of thermodynamics,

According to Kelvin-Planck's statement of second law of thermodynamics,

The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.

Which of the following statement is correct according to Clausis statement of second law of thermodynamics?

Which of the following is the correct statement of the second law of thermodynamics?

Diesel cycle consists of following four processes

Brayton cycle consist's of following four processes

When coal is first dried and then crushed to a fine powder by pulverizing machine, the resulting fuel is called

For reversible adiabatic process, change in entropy is

If a system after undergoing a series of processes, returns to the initial state then

The value of one bar (in S. I. units) is equal to

The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

Which of the following is a reversible non-flow process?

The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called

The efficiency of Diesel cycle with decrease in cut-off

Otto cycle consists of

Stirling cycle consists of

Carnot cycle consists of

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

Reversed Joule cycle is known as

The same volume of all gases would represent their

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

The compression ratio for Diesel engines is

The efficiency of the Carnot cycle is (where T 1 and T 2 = Highest and lowest temperature during the cycle)

The volumetric or molar specific heat at constant pressure is the product of

In a Carnot cycle, heat is transferred at

The pressure exerted by an ideal gas is ________ of the kinetic energy of all the molecules contained in a unit volume of gas.

For which of the following substances, the gas laws can be used with minimum error

The condition for the reversibility of a cycle is

If value of n is infinitely large in a polytropic process pVn = C, then the process is known as constant

The unit of universal gas constant is

In S. I. units, the value of the universal gas constant is

General gas equation is

Petrol is distilled at

The compression ratio for petrol engines is

Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant

Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant

A definite area or a space where some thermodynamic process takes place is known as

The work ratio of a gas turbine plant is given by

The mass of excess air supplied is equal to

An ideal gas as compared to a real gas at very high pressure occupies

The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

If the value of n = 0 in the equation pvn = C, then the process is called

If in the equation pv n = C, the value of n = $$ propto $$, then the process is called

When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as

A cycle consisting of two isothermal and two isentropic processes, is known as

Barometric pressure is equal to

Specific heat of air at constant pressure is equal to

One barometric pressure or 1 atmospheric pressure is equal to

The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as

A heat exchange process in which the product of pressure and volume remains constant is known as

Work done in an adiabatic process between a given pair of end states depends on

Steam coal is a

The increase in entropy of a system represents

Which of the following has the highest calorific value?

Which of the following gas has the highest calorific value?

Carbonization of coal consists of

The value of cp/cv for air is

A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as

The amount of heat generated per kg of fuel is known as

The specific heat of water is

Change in enthalpy of a system is the heat supplied at

The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to

During which of the following process does heat rejection takes place in Carnot cycle?

The unit of mass in S.I. units is

The unit of pressure in S.I. units is

The unit of length in S.I. units is

The unit of energy in S.I. units is

The unit of time in S.I. units is

The unit of temperature in S.I. units is

The unit of power in S.I. units is

The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is

Temperature of a gas is produced due to

Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to

A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.

A cycle consisting of _________ and two isothermal processes is known as Stirling cycle.

The behavior of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)

The general law for the expansion or compression of gases, is

In an isothermal process

The hyperbolic process is governed by

An isothermal process is governed by

If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called

The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature and R = Gas constant)

The heat supplied to the gas at constant volume is (where m = Mass of gas, C v = Specific heat at constant volume, C p = Specific heat at constant pressure, T 2 - T 1 = Rise in temperature and R = Gas constant)

Relation between c p and c v is given by (where c p = Specific heat at constant pressure, c v = Specific heat at constant volume, $$gamma = frac{{{{ ext{c}}_{ ext{p}}}}}{{{{ ext{c}}_{ ext{v}}}}},$$ xa0 known as adiabatic index and R = Gas constant)

Those substances which have so far not been resolved by any means into other substances of simpler form are called

For same compression ratio and for same heat added

The natural solid fuel is

The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature and dQ = Heat absorbed or rejected)

The efficiency of a gas turbine is given by

One kg of carbon monoxide requires __________ kg of oxygen to produce $$frac{{11}}{7}$$ kg of carbon dioxide gas.

When cut-off ratio is ________

the efficiency of Diesel cycle approaches to Otto cycle efficiency

One molecule of oxygen consists of __________ atoms of oxygen.