Multiple Choice Questions (MCQ) on Mechanical Engineering
56-If there are several unbalanced masses in a rotor in different planes, the minimum number of balancing masses required is/are
(A) one
(B) two
(C) three
(D) four
57-Six sigma company accepts the following number of defective products in one million numbers of products
(A) 3
(B) 6
(C) 30
(D) 60
58-A flexure formula is used for
(A) pure bending only
(B) bending with shear only
(C) bending as well as for bending with shear
(D) none of the above
59-The number of elastic constants in Triclinic material is
(A) 36
(B) 9
(C) 2
(D) 21
60-The ___ of strength in ___ due to overloading in known as Bouschinger effect.
(A) loss, compression
(B) loss, tension
(C) gain, compression
(D) gain, tension
61-Stress is
(A) Zero order tensor
(B) First order tensor
(C) second order tensor
(D) third order tensor
62-The Poisson’s ratio (μ) of bottle cork is
(A) 0.5
(B) 0.3
(C) 0.25
(D) 0
63-With increase in pressure, the latent heat of the steam
(A) remains the same
(B) increases
(C) decreases
(D) behaves unpredictably
64-In steam power cycle, reheat factor is usually in the range
(A) 1.02 to 1.05
(B) 1.12 to 1.15
(C) 1.5 to 1.8
(D) 1.9 to 2.1
65-In a steam power plant, feed water heater is a heat exchanger to preheat feed water by
(A) live steam from steam generator
(B) hot air from air preheater
(C) hot flue gases coming out of the boiler
(D) extracting steam from turbine
66-A condenser of a refrigeration system rejects heat at a rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system would be
(A) 1/4
(B) 1/3
(C) 3
(D) 4
ANSWERS:
56-(A), 57-(A), 58-(A), 59-(D), 60-(A), 61-(C), 62-(D), 63-(B), 64-(A), 65-(D), 66-(B)