Multiple Choice Questions (MCQ) on Mechanical Engineering
45-Which one is not the advantage of cold working?
(A) A high quality surface finish
(B) Improved mechanical property
(C) Close dimensional tolerance
(D) More ductile material available
46-Percent elongation is an indicator of which mechanical property?
(A) UTS
(B) Yield strength
(C) Ductility
(D) Resilience
47-Simple viscoplastic constitutive equations are used to model
(A) Stress relaxation
(B) Creep
(C) Low cycle fatigue
(D) Ductile fracture
48-Which of the following is a measure of the pressure exerted by a state of stress?
(A) Deviatoric stress
(B) Hydrostatic stress
(C) von Mises stress
(D) Cauchy stress
49-The Grubler’s criterion for determining the degrees of freedom of a mechanism having plane motion is
(A) (n-1)-j
(B) 3(n-1)-2j
(C) 2(n-1)-2j
(D) 4(n-1)-3j
Where n=number of links and j=number of binary joints.
50-The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is
(A) ½* μ.W.R. cosec α
(B) 2/3* μ.W.R. cosec α
(C) 3/4* μ.W.R. cosec α
(D) μ.W.R. cosec α
51-Absorption of energy into a flywheel is
(A) at constant speed
(B) accompanied by increase of speed
(C) accompanied by decrease of speed
(D) not concerned with increase/decrease of speed
52-For static balancing
(A) dynamic forces acting on the shaft must be zero
(B) net couple acting on the shaft due to dynamic forces must be zero
(C) both (A) and (B)
(D) none of the above
53-The maximum secondary unbalanced force due to a reciprocating mass has
(A) same frequency as of maximum primary force
(B) n times the frequency as of maximum primary force
(C) 1/n times the frequency as of maximum primary force
(D) none of the above
54-The supply of working fluid to the engine to suit the load conditions is controlled by
(A) Flywheel
(B) Governor
(C) Throttle valve
(D) All of the above
55-Sensitiveness of a governor is defined as
(A) range of speed / mean speed
(B) range of speed / 2 x mean speed
(C) mean speed / range of speed
(D) 2 x mean speed / range of speed
ANSWERS:
45-(D), 46-(C), 47-(B), 48-(A), 49-(B), 50-(A), 51-(B), 52-(A), 53-(C), 54-(B), 55-(A)