Top 250+ Solved Theory of Machines MCQ Questions Answer
Q. The type of teeth used on a gear used in sugar crushing is
a. Hyperboild
b. Semi-epicycloidal
c. Involute
d. Cycloidal
e. Epicycloidal
Q. In a pin jointed mechanism, the line of thrust on a link is
a. tangential to the friction circles at the ends
b. along the friction axis
c. inclined to axis of link by an angle ?, known as angle of friction
d. All the above
e. None of the above
Q. In automobiles, Hooke's joint is used between
a. Flywheel and clutch
b. Clutch and gear box
c. Gear box and differential
d. Differential and wheels
e. None of the above
Q. A pair is termed as a higher pair when relative motion between two elements of the pair is
a. partly sliding and partly turning
b. rolling only
c. Outer circle
d. sliding only
e. turning only
Q. The swaying couple in a locomotive is due to
a. unbalanced primary forces
b. unbalanced secondary forces
c. partial balancing
d. None of the above
e. None of the above
Q. Bearing suitable for fluctuating loads is
a. Ball bearing
b. Needle roller bearing
c. Sleeve bearing
d. Bush bearing
e. Roller bearing
Q. Radial distance from the top to the pitch circle for a tooth is known as
a. working depth
b. dedendum
c. addendum
d. None of the above
e. None of the above
Q. Higher pressure angle results in
a. Narrow base and weaker teeth
b. Weaker teeth
c. Non-uniform motion transmission
d. Bigger size of gear teeth
e. Wider base and stronger teeth
Q. In a radial cam with a roller on follwer the prime circle can be defined as
a. the smallest circle tangent to the pitch curve
b. the smallest circle tangent to the cam profile
c. a circle drawn with radius equal to the distance between the pitch point and the centre of base circle
d. None of the above
e. None of the above
Q. Identify the incorrect statement in case of cycloidal gears
a. No lubrication needed
b. Interference does not exist
c. Have less wear
d. Interference exists
e. Ease in transmitting variable loads
Q. Which one of the following is not applicable to involute profile
a. The angular velocity ratio when tow involutes are in mesh, is inversely proportional to the size of the base circles
b. No involute has a pressure angle until it is brought in contact with other mating involute
c. Involute is the only tooth form that is not sensitive to centre distance of their base circles
d. The shape of the involute profile is dependent only on the dimensions of the base circle
e. The pitch diameters of mating involutes are inversely proportional to their base circle diameters
Q. A shaft having one end fixed has a disc oscillating freely at the other end. If the shaft stiffness, increases the natural frequency of vibrations will
a. Increase
b. Decrease
c. There will be no effect
d. Will depend on the stiffness of the disc
e. None of the above
Q. If a machine uses four V belts, while purchasing care should be taken to ensure that
a. All belts are same section
b. All above
c. All belts are of same batch number
d. All belts are of same size
e. All belts are of same manufacturers
Q. In case of balancing problems pertaining to locomotives, the resultant unbalanced force is minimum when
a. Half of the reciprocating masses are balanced by rotating masses
b. 1/2 of the reciprocating mass are balanced by equivalent rotating mass
c. More than half of the reciprocating masses are balanced by rotating masses
d. Reciprocating masses are balanced half by equivalent opposite reciprocating masses and the balance by rotating masses
e. None of the above
Q. Which of the following is a higher pair?
a. A shaft revolving in a bearing
b. Piston reciprocating inside the cylinder
c. Automobile steering gear
d. Ball and socket
e. None of the above