Workshop Technology - Study Mode

[#161] During hot working of metals
Correct Answer

(D) All of the above

Explanation

Solution: During hot working of metals the Porosity of the metal is largely eliminated and Grain structure of the metal is refined and Mechanical properties are improved due to refinement of grains

[#162] The temperature of oxy-hydrogen flame is ________ oxyacetylene flame.
Correct Answer

(B) Less than

Explanation

Solution: The maximum temperature of Oxy-hydrogen flame is about 2,800°C. The temperature of the oxyacetylene flame 3,480°C.

[#163] When more volume of acetylene and less volume of oxygen is supplied, then a ________ flame is obtained.
Correct Answer

(C) Carburizing

Explanation

Solution: When more volume of acetylene and less volume of oxygen is supplied, then a Carburizing flame is obtained. Carburizing flame is one with little oxygen, which produces a sooty, lower-temperature flame. It is often used to anneal metal, making it more malleable and flexible during the welding process.

[#164] In permanent mould casting method
Correct Answer

(D) None of the above

Explanation

Solution: Permanent mold casting is a metal casting process that employs reusable molds , usually made from metal. The most common process uses gravity to fill the mold, however gas pressure or a vacuum are also used.

[#165] Cutting and forming operations can be performed in a single operation in a
Correct Answer

(D) Combination die

Explanation

Solution: It is difficult from compound die in that in this die, a cutting operation is combined with a bending or drawing operation, due to that it is called combination die