51. In a steam engine, the link constitutes a
piston, piston rod and crosshead
connecting rod with big and small end brasses, caps and bolts
crank pin, crankshaft and flywheel
all of the above
✅ The correct answer is option D.
Theory of machines MCQs
52. The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the
unbalanced couples are caused only at higher speeds
unbalanced forces are not dangerous at higher speeds
effects of unbalances are proportional to the square of the speed
effects of unbalances
✅ The correct answer is option C.
54. The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.
less
more
same
✅ The correct answer is option B.
55. The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.
TRUE
FALSE
✅ The correct answer is option A.
58. In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.
equal to
directly proportional to
inversely proportional to
independent of
✅ The correct answer is option C.
59. A spring controlled governor is said to be unstable, if the relation between the controlling force (Fc) and radius of rotation (r) is Fc = ar.
Agree
Disagree
✅ The correct answer is option B.
60. In the two rotor system as shown in the below figure (I1 < I2), a node of vibration is situated
between I1, and I2 but nearer I1
between I1, and I2 but nearer to I2
exactly in the middle of the shaft
nearer to I1 but outsi
✅ The correct answer is option B.