TRUE
FALSE
✅ The correct answer is option A.
Mechanical Engineering MCQs
The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p1 = Intake pressure of air, p2 = Intercooler pressure, and p3 = Delivery pressure of air)
p2 = p1 x p3
p2 = p1/p3
p2 = p1 x p3
p2 = p3/p1
✅ The correct answer is option C.
In welding aluminium with TIG arc welding, alternating current is used.
Correct
Incorrect
✅ The correct answer is option A.
The process which improves the machinability of steels, but lowers the hardness and tensile strength is
normalising
full annealing
process annealing
spheroidising
✅ The correct answer is option D.
A body is said to be under forced vibrations, when
there is a reduction in amplitude after every cycle of vibration
no external force acts on a body, after giving it an initial displacement
a body vibrates under the influence of external force
none of the above
✅ The correct answer is option A.
The ratio of surface convection resistance to the internal conduction resistance is known as
Grashoff number
Biot number
Stanton number
Prandtl number
✅ The correct answer is option B.
The distance between the centre of a rivet hole to the nearest edge of plate, is called
margin
pitch
back pitch
diagonal pitch
✅ The correct answer is option A.
A machine which violates the first law of thermodynamics is known as perpetual motion machine of the second kind.
Correct
Incorrect
✅ The correct answer is option B.
The emissivity for a black body is
0
0.5
0.75
1
✅ The correct answer is option D.
In a four stroke cycle engine, the sequence of operations is
suction, compression, expansion and exhaust
suction, expansion, compression and exhaust
expansion, compression, suction and exhaust
compression, expansion
✅ The correct answer is option A.