Top 150+ Solved Theory of Mechanics MCQ Questions Answer
Q. The uniform wear conditions are used_____.
a. for maximum power to be transmitted
b. for safe design of clutches
c. for safe design bearing
d. for overcoming the frictional torque
Q. The uniform Pressure conditions are used_____.
a. for maximum power to be transmitted
b. for safe design of clutches
c. for safe design bearing
d. for overcoming the frictional torque
Q. For safe design of bearing, we assume____.
a. maximum power to be transmitted
b. safe design of clutches
c. safe design bearing
d. overcoming the frictional torque
Q. For safe design of clutches, we assume____.
a. uniform pressure conditions
b. uniform wear condition
c. neither uniform pressure nor uniform wear
d. all of the above
Q. According to uniform wear theory____. Where ,w=Angular velocity of shaft, r=radius of shaft, W=Axial lead on shaft
a. p.w=constant
b. p.r=constant
c. p.w=constant
d. p.t=constant
Q. In case of foot step bearing, the frictional force under the conditions of uniform pressure may be assumed to be acting at____.
a. r
b. (1/2).r
c. (3/2).r
d. (2/3)r
Q. In case of foot step bearing, the frictional force under the conditions of uniform wear may be assumed to be acting at____.
a. r
b. (1/2).r
c. (3/2).r
d. (2/3).r
Q. Torque required to overcome the friction between shaft and bearing surface in case of multiple flat collar bearing is ___________.
a. independent on of collars
b. dependent on radius of collar
c. dependent of no of collars
d. none of above
Q. In case of flat pivot bearing,the rubbing velocity is _________.
a. maximum at the center of the contact area
b. zero at the center and maximum at the outer radius
c. uniform throughout the contact area
d. zero at the outer radius
Q. The rate of wearing in case of flat pivot bearing is ______.
a. inversely proportional to the pressure intensity
b. directly proportional to the rubbing velocity
c. directly proportionl to the pressure intensity
d. both (b) and (c )
Q. For calculating the friction power for bearing, the assumptions made in practice are_____.
a. the rate of wearing at the surface is uniform
b. the rubbing velocity is constant
c. the pressure intensity is uniform
d. (a) and (c ) only
Q. In case of flat pivot bearing the frictional torque transmitted for uniform pressure as compared to the frictional torque transmitted for uniform wear_____.
a. is more
b. is less
c. is constant
d. may be more or less
Q. When the axial load carried by the shaft in case of flat collar bearing, is large; a number of collars are provided on the shaft. This is done____.
a. to reduce the frictional torque
b. to increase the frictional torque
c. to reduce the intensity of pressure
d. to increse the intensity of pressure