Multiple Choice Questions (MCQ) with answers on Theory of Machines
23-The fraction of unbalanced mass used for primary balancing of a reciprocating engine is
(A) 0.2
(B) 0.9
(C) 0.6
(D) 0.05
24-If the balancing mass of a locomotive wheel is 15 kg acting at a radius of 0.7 m when the wheel has dead weight of 110 kg, the limiting rotational speed of the wheel in rad/sec to avoid lifting from rails is close to:
(A) 7.1
(B) 3.2
(C) 9.7
(D) 8.4
25-A flywheel of moment of inertia 9.8 kgm2 fluctuates by 30 rpm for a fluctuation in energy of 1936 joules. The mean speed of the flywheel is:
(A) 900 rpm
(B) 600 rpm
(C) 936 rpm
(D) 1200 rpm
26-The product of moment of inertia and angular velocity is known as:
(A) Angular torque
(B) Kinetic energy
(C) Angular momentum
(D) None of the above
27-The frictional torque transmitted in the case of flat pivot bearing for uniform pressure is:
(A) μWR
(B) (1/3)μWR
(C) (2/3)μWR
(D) (1/2)μWR
28-Which of the following is an example of friction clutch?
(A) Disc
(B) Cone
(C) Plate
(D) all of the above
29-The module if defined as the ratio of:
(A) Number of teeth to the pitch circle diameter
(B) Pitch circle diameter to number of teeth
(C) Circumference of the pitch circle to number of teeth
(D) None of the above
30-The locus of a point on the circumference of a circle, which rolls without slipping on a fixed straight line, is known as:
(A) Cycloid
(B) Involute
(C) Epicycloid
(D) Hypocycloid
31-When the axes of the first and last wheels of a compound gear train are co-axial then the train is known as
(A) Simple gear train
(B) Epicyclic gear train
(C) Reverted gear train
(D) Compound gear train
32-The follower of a cam has
(A) Uniform acceleration and retardation
(B) Cycloidal motion
(C) Simple harmonic motion
(D) Any one of the above
33-Which one of the following is a spring loaded governor?
(A) Proell governor
(B) Porter governor
(C) Watt governor
(D) Hartnell governor
34-If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half mean radius of the former, the energy stored in the latter at the same speed will be:
(A) 4 times the first
(B) Same as the first
(C) One-fourth of the first
(D) Half of the first
ANSWERS:
23-(C), 24-(B), 25-(D), 26-(C), 27-(C), 28-(D), 29-(B), 30-(C), 31-(C), 32-(D), 33-(D), 34-(C)