✅ The correct answer is option D.
Engineering MCQs
If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.
Yes
No
✅ The correct answer is option A.
The evaporator changes the low pressure liquid refrigerant from the expansion valve into
high pressure liquid refrigerant
low pressure liquid and vapour refrigerant
low pressure vapour refrigerant
none of these
✅ The correct answer is option C.
Steam coal is a
pulverised coal
brown coal
coking bituminous coal
non-coking bituminous
✅ The correct answer is option D.
The critical pressure ratio for gases is
0.528
0.546
0.577
0.582
✅ The correct answer is option A.
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.
smaller
greater
✅ The correct answer is option B.
During cold working process
grain structure is distorted
strength and hardness of metal increases
close dimensional tolerance can be maintained
all of the above
✅ The correct answer is option D.
The blast furnace gas is a by-product in the production of pig iron in the blast furnace.
Yes
No
✅ The correct answer is option A.
When a hole of diameter ‘d’ is punched in a metal of thickness ‘t’, then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)
d.t.τu
πd.t.τu
x d2τu
x d2 x tτu
✅ The correct answer is option B.
The ratio of the indicated thermal efficiency to the air standard efficiency is known as
mechanical efficiency
overall efficiency
volumetric efficiency
relative efficiency
✅ The correct answer is option D.