261. Compressed dry air is used as the cutting fluid, while machining____________________?
A. Steel
B. Cast iron
C. Aluminium
D. None of these

262. With increase in compression ratio, the volumetric efficiency of air compressor____________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease (depends on the suction pressure)

263. Which of the following has the least value of ultimate tensile strength (UTS) ?
A. Medium carbon steel
B. High carbon steel
C. Cast iron
D. Wrought iron

264. Current employed in resistance welding ranges from ____________________ kVA/cm2?
A. 1.2 to 2.5
B. 4.5 to 6.2
C. 7.5 to 8.5
D. 10.5 to 15.5

265. Presence of nickel & chromium in steel does not raise its _________________?
A. Elastic limit
B. Machining properties
C. Ductility
D. Resilience

266. Materials having ________________ lattice structure are usually the most ductile ?
A. Body centred cubic (bcc)
B. Hexagonal close packed (hcp)
C. Face centred cubic (fcc)
D. None of these

267. Stresses encountered in the metal forming processes are less than the _____________ of the material?
A. Fracture strength
B. Yield strength
C. Elastic limit
D. Limit of proportionality

268. Damage to metal surface by mechanical action is called____________________?
A. Pitting
B. Corrosion
C. Erosion
D. None of these

269. Minimum number of members required to form a Public Limited Joint Stock Com-pany is___________________?
A. 7
B. 10
C. 12
D. 17

270. Increase in the entropy of a system represents the_____________________?
A. Degradation of energy
B. Decrease in system pressure
C. Increase in the availability of energy
D. Increase in the temperature

NOTE
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PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
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