Top 250+ Solved Theory of Machines MCQ Questions Answer
Q. The vibrations in which the restoring forces are not proportional to the displacements and the first power of velocity are known as
a. Bearing vibrations
b. Over damped vibrations
c. Torsional vibrations
d. Non-linear vibrations
e. Under damped vibrations
Q. If a particle of a link has a velocity when changes both in magnitude and direction at any instant, then
a. It must have three components of acceleration e.g. centripetal, centrifugal and gravitational
b. It must have two components of acceleration e.g. centripetal, and tangential
c. It must have three components of acceleration e.g. centripetal centrifugal and tangential
d. It must have four components of acceleration e.g. centripetal, centrifugal gravitational and tangential
e. It must have only unidirectional acceleration
Q. Which of the following oil has highest specific gravity?
a. Turpentine
b. Diesel
c. Castor oil
d. Petrol
e. Sperm
Q. In case of involute gears
a. Interference is inherently absent
b. A convex flank is always in contact with concave flank
c. Variation in centre distance of shafts increases radial force
d. Pressure angle is constant throughout the teeth engagement
e. None of the above
Q. The rotor of a ship rotates in anticlock wise direction when viewed from the bow end and the ship takes a left turn. The effect of gyroscopic couple on the ship is
a. to lower the bow and raise the stern
b. to raise the bow and lower then stern
c. to roll the ship slightly clockwise when viewed fro bow end
d. None of the above
e. None of the above
Q. In case of gears, the module is
a. The length of the pitch circule diameter per tooth
b. The number of teeth per unit length on pitch circle diameter
c. The pistance measured along the pitch circle from a point on one tooth to a corresponding point on the adjacent point
d. Any of the above
e. None of the above
Q. Hammer blow in locomotives results in
a. Variable horizontal force
b. Tendency to lift wheel from rails
c. Uniform torque
d. Pulsating torque
e. Uneven speed
Q. In Iocomotive operation, the swaying couple results due to
a. Primary disturbing force
b. Use of double acting cylinders
c. Hammer blow
d. Use of two cylinders
e. High speeds
Q. Which of the following is a centrifugal type governor?
a. Watt governor
b. Hartnell governor
c. Porter governor
d. All of the above
e. None of the above
Q. The maximum efficiency of a screw jack provided with square threads and angle of friction 30? will be
a. 47.50%
b. 60%
c. 25%
d. 33%
e. 50%
Q. A governor is said to be stable when
a. There is one radius of the governor weights for each equilibrium speed
b. There is minimum change of the radius of the governor weights at a operating speed
c. The position of balls does not change within the operating speed
d. The position of balls changes within permissible limits within the working range of a governor
e. None of the above
Q. Klien's construction gives graphical construction for
a. Both of above
b. Acceleration polygon
c. Slider-crank mechanism
d. Velocity polygon
e. Four bar chain mechanism
Q. Can simple band brake be made self-energising type
a. No
b. Yes, but with require several modifications
c. Will not be economical
d. Yes
e. Yes, but with few limitations
Q. For speed reduction in the ratio of 100 the type of gear preferred is
a. Spur gear
b. Worm and worm wheel
c. Bevel gear
d. Hypoid gear
e. Helical gear
Q. The moment of friction with the assumption of uniform wear to uniform pressure is
a. Same
b. Greater
c. Lower
d. (A) and (B) above
e. (A) and (C) above