Mechanical Engineering MCQs

A steel bar 2 m long, 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poission’s ratio of the bar in tension will be __________ the Poisson’s ratio for the bar in compression.

by
equal to
less than
greater than
✅ The correct answer is option A.

The indicated power of a four-stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m2, L = Length of stroke in metres, A = Cross-sectional area of the piston in m2, and N = Speed of the engine in revolutions per second (r.p.s))

by
P.L.A.N/2
P.L.A.N
2 x P.L.A.N
P.L.A.N/4
✅ The correct answer is option A.

Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

by
none of these
✅ The correct answer is option B.