Top 250+ Solved Theory of Machines MCQ Questions Answer
Q. A vibrating system with unity as damping factor will be
a. Free from vibrations
b. Damped to 1% of critical speed
c. Damped to safe limits
d. Partly damped
e. Critically damped
Q. In case of spur gears the flank of the tooth is
a. The surface of the top of the tooth
b. The part of the tooth surface lying below the pitch surface
c. The curve forming face and flank
d. Radius that connects in the root circle to the profile of the tooth
e. The width of the gear tooth measured axially along the pitch surface
Q. In case of an elliptical trammel
a. One pair turns and three pairs slide
b. All four pairs slide
c. Three pairs turn and one pair slides
d. All four pairs turn
e. Two pairs turn and two pairs slide
Q. Creep in belts is due to
a. Plasticity of belt material
b. Elasticity of belt material
c. Plastic deformation of belt material due to constant use
d. Differential elougation of belt due to difference in tension on two sides of a pulley
e. Elongation of belt due to tension
Q. Which one of the following is the inversion of slider crank mechanism
a. Reciprocating internal combustion engine
b. Crank and slotted level mechanism
c. Whitworth quick return mechanism
d. (A) and (B) above
e. (A), (B) and (C) above
Q. The radial depth of a ger tooth below the pitch circle is
a. Addendum + dedendum
b. Addendum
c. Addendum-clearance
d. Dedendum-clearance
e. Dedendum
Q. The pitch point on a cam is
a. Any point on pitch curve
b. The point on cam pitch circle having the maximum pressure angle
c. Any point on pitch curve
d. A point at a distance equal to pitch circle radius from the centre
e. None of the above
Q. While evaluating the minimum number of teeth on a opinion the major consideration is
a. Operating speed
b. To minimise clearance
c. To avoid interference
d. The shaft diameter on which pinion is to be mounted
e. The minimum diameter of the pinion
Q. Gears of watches are generally manufactured by
a. Stamping
b. Machining on a gear shaper
c. Power metallurgy process
d. Die casting
e. Machining on a hobber
Q. The effect of creep in case of cross belt drive is
a. to increase power transmission
b. to increase the speed of driven pulley
c. to reduce the speed of driven pulley
d. None of the above
e. None of the above
Q. Isochronism in a governor is desirable when
a. One speed is desired under one load
b. The engine operates at high speeds
c. The engine operates at variable speeds
d. One speed is desired to be kept for all loads
e. The engine operatres at low speeds
Q. In case of locomotives, the swaying couple is resisted by
a. Dead weight of the engine
b. Fish plates of the tails
c. Inside section of the rails
d. Side pressure between the flanges of the wheels
e. (C) and (D) together
Q. A gear cutter suitable for cutting 42 to 54 teeth will provide correct form
a. For any gear having teeth anywhere between 42 to 54
b. For only 42 teeth gear
c. For only 54 teeth gear
d. For only 48 teeth gear
e. None of the above