Top 150+ Solved Theory of Mechanics MCQ Questions Answer
Q. Choose the correct statement regarding the safe design of a bearing.
a. when horse power lost in friction is to be determined, uniform rate of wear is assumed
b. when horse power transmitted is to be determined, uniform pressure is assumed
c. when horse power lost in friction is to be determined, uniform pressure is assumed and when horse power transmitted is to be determined, uniform wear is assumed
d. none of the above
Q. For flat and conical pivots, the ratio of friction torque with uniform wear to friction torque with uniform pressure is ____.
a. (2/3)
b. (3/2)
c. (4/3)
d. (3/4)
Q. The ratio of frictional torque produced for uniform wear to frictional torque produced for uniform pressure is ____.
a. (3/4)
b. (4/3)
c. (2/3)
d. 1
Q. The frictional torque for the same diameter in a conical bearing is ____.
a. more
b. less
c. equal
d. may be more or less
Q. The frictional torque transmitted by a conical bearing is ____.
a. less than that of flat collar bearing
b. equal to that of flat collar bearing
c. more than that of flat collar bearing
d. none of the above
Q. The frictional torque produced due to friction for same shaft diameter, in conical bearing is____.
a. less than that for flat collar bearing
b. equal to that for flat collar bearing
c. more than that for flat collar bearing
d. may be more or less depending upon cone angle
Q. The ratio of frictional torque produced for uniform wear to that for uniform pressure is ____.
a. 1
b. (2/3)
c. (4/3)
d. (3/4)
Q. In case of pivot bearing the rate of wear is _____.
a. maximum at the center of the contact area
b. zero at the center of contact
c. uniform throughout the contact area
d. zero at the maximum radius of the contact area
Q. The number of collars are provided to carry a fixed axial force in a flat collar bearing _______.
a. to increase torque
b. to decrease torque
c. to decrease intensity of pressure
d. to decrease intensity of pressure
Q. In flat pivot bearing the total moment of friction force______.
a. for uniform wear is greater than that for uniform pressure
b. for uniform wear is less than that for uniform pressure
c. for uniform wear is equal to that for uniform pressure
d. for uniform wear may be more or less and cannot be predicted
Q. To be safe side in the design, the unform pressure and uniform wear is assumed respectively_____.
a. for power transmitted by friction and power lost due to friction
b. for power lost due to friction and power transmitted by friction
c. for torque transmitted by friction and friction torque overcome
d. none of the above
Q. Choose the correct statement for safe design.
a. for power lost in friction uniform wear is assumed
b. for power lost in friction uniform pressure is assumed
c. for power transmitted due to friction uniform pressure is assumed
d. for power transmitted due to friction or lost in friction uniform wear is assuned
Q. Choose the correct statement for safe design.
a. for power transmitted by friction uniform wear is assumed
b. for power transmitted by friction uniform pressure is assumed
c. for power lost in friction and power transmitted uniform wear is assumed
d. power lost in friction and power transmitted uniform pressure is assuned
Q. The purpose of providing multiple collars on a flat collar pivot bearing is to ____.
a. establish self sustaining bearing conditions
b. increase the frictional resistance
c. distribute the axial load because of limiting bearing pressure on bearing
d. increase the power absorbed by the bearing
Q. In a multi-collared thrust bearing consisting of 'n' collars and subjected to axial load W, load sheared by each collar is _______.
a. w
b. w/n
c. w/(n-1)
d. none of these