Top 250+ Solved Theory of Machines MCQ Questions Answer
Q. Which of the following road offers maximum resistance to automobiles?
a. Loose sand
b. Well rolled gravel
c. Wood paving
d. Macadam
e. Sperm
Q. The mechanism used to enlarge or reduce moments for reproducing drawings to different scales is known as
a. Durograph
b. Graphometer
c. Pantograph
d. Clinograph
e. Trisquare
Q. The frictional torque transmitted by a cone clutch is the same as that of
a. flat collar bearing
b. conical pivot bearing
c. truncated conical pivot bearing
d. None of the above
e. None of the above
Q. Froude's dynamometer is
a. Torsion dynamometer
b. Fan type dynamometer
c. Vortex type hydraulic dynamometer
d. Mechanical friction type dynamometer
e. Transmission type of dynamometer
Q. In vibration analysis 'Beat' frequency is
a. The frequency at which vibrations of a system are damped
b. Said to occur when two vibrations of almost equal frequency are present
c. The frequency when a system exceeds the vibrations frequency from the critical value
d. The frequency below which vibrations do not cause appreciable damage to equipment
e. One at which the vibrations of a system act exactly opposite to the other thereby causing damping
Q. In case of Scotch Yoke Mechanism the Coriolis component is
a. Involved but generally neglected
b. Not involved
c. Involved if some other conditions are satisfied
d. Sometimes involved
e. Involved
Q. A 0.5 kg weight attached to a light spring elongates it 0.981 mm. The natural frequency of the system would be approximately
a. 26 cps
b. 21 cps
c. 6 cps
d. 16 cps
e. 11 cps
Q. A vibrating system is said to be stable if
a. The amplitude of vibration decreases with time
b. The amplitude of vibration does not change with time
c. Only transient increases indefinitely with time
d. The total energy in the system does not change with time
e. None of the above
Q. The cam angle is
a. The angle of rotation of the cam for a definite displacement of the follower
b. Angle subtended by live portion of cam at the cam centre
c. The angle subtended at the cam centre by the portion of cam during which the follower moves
d. The angle subtended by the cam at the cam centre when the follower dwells
e. None of the above
Q. The coefficient of friction between pulley and belt is reduced to half. If the initial ratio of tension in belt is 5, then the new value will be
a. 2
b. 4
c. 5
d. 7.5
e. None of the above
Q. In a system if the speed reduction of 60 : 1 is desired the convenient way is to use
a. Helical gears
b. Worm and worm wheel
c. Differential system
d. Bevel gears
e. Simple gear train
Q. Which of following gear system have minimum axial thrust?
a. Double helical gears
b. Bevel gears
c. Spur gears
d. Helical gears
e. Miter gears
Q. In Iocomotives, swaying couple is caused due to
a. Unbalanced part of the secondary forces acting at a distance between the line of stroke of the cylinders
b. Vertical unbalanced primary forces acting in the plane of the wheels
c. Vertical unbalanced primary forces acting in the plane of the wheels
d. Unbalanced parts of the primary forces acting at a distance between the line of stroke of the cylinders
e. Horizontal unbalanced primary forces acting in the plane of the wheel
Q. A governor is said to be isochronous when
a. The equilibrium ball radii is constant for a given speed
b. For each speed within the working range the ball weights occupy a definite specific position
c. There is only one radius of the governor weights for each equilibrium sped
d. There is only one equibilbrium speed which is constant for all radii of rotation of the bells within the working range
e. None of the above
Q. In a Hartnell governor if the stiffness of spring is increased the governor will
a. Become more sensitive
b. Become less sensitive
c. Remain unaffected as far sensitivity is concerned
d. Start hunting (E) Become isochronous
e. 21 cps