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This set of Theory of Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Theory Of Mechanics Set 1
Q1 | The uniform wear conditions are used_____.
- for maximum power to be transmitted
- for safe design of clutches
- for safe design bearing
- for overcoming the frictional torque
Q2 | The uniform Pressure conditions are used_____.
- for maximum power to be transmitted
- for safe design of clutches
- for safe design bearing
- for overcoming the frictional torque
Q3 | For safe design of bearing, we assume____.
- maximum power to be transmitted
- safe design of clutches
- safe design bearing
- overcoming the frictional torque
Q4 | For safe design of clutches, we assume____.
- uniform pressure conditions
- uniform wear condition
- neither uniform pressure nor uniform wear
- all of the above
Q5 | According to uniform wear theory____. Where ,w=Angular velocity of shaft, r=radius of shaft, W=Axial lead on shaft
- p.w=constant
- p.r=constant
- p.w=constant
- p.t=constant
Q6 | In case of foot step bearing, the frictional force under the conditions of uniform pressure may be assumed to be acting at____.
- r
- (1/2).r
- (3/2).r
- (2/3)r
Q7 | In case of foot step bearing, the frictional force under the conditions of uniform wear may be assumed to be acting at____.
- r
- (1/2).r
- (3/2).r
- (2/3).r
Q8 | The ratio of friction torque for uniform pressure to uniform wear for the same dimensions and load is _______.
- >1
- 1
- <1
- (1/2)
Q9 | Torque required to overcome the friction between shaft and bearing surface in case of multiple flat collar bearing is ___________.
- independent on of collars
- dependent on radius of collar
- dependent of no of collars
- none of above
Q10 | In case of flat pivot bearing,the rubbing velocity is _________.
- maximum at the center of the contact area
- zero at the center and maximum at the outer radius
- uniform throughout the contact area
- zero at the outer radius
Q11 | The rate of wearing in case of flat pivot bearing is ______.
- inversely proportional to the pressure intensity
- directly proportional to the rubbing velocity
- directly proportionl to the pressure intensity
- both (b) and (c )
Q12 | For calculating the friction power for bearing, the assumptions made in practice are_____.
- the rate of wearing at the surface is uniform
- the rubbing velocity is constant
- the pressure intensity is uniform
- (a) and (c ) only
Q13 | In case of flat pivot bearing the frictional torque transmitted for uniform pressure as compared to the frictional torque transmitted for uniform wear_____.
- is more
- is less
- is constant
- may be more or less
Q14 | The ratio of friction torque transmitted for uniform pressure to frictional torque transmitted for uniform wear in case of flat pivot, is equal to_______.
- (1/3)
- (2/3)
- 1
- (4/3)
Q15 | 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____.
- to reduce the frictional torque
- to increase the frictional torque
- to reduce the intensity of pressure
- to increse the intensity of pressure
Q16 | Choose the correct statement regarding the safe design of a bearing.
- when horse power lost in friction is to be determined, uniform rate of wear is assumed
- when horse power transmitted is to be determined, uniform pressure is assumed
- 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
- none of the above
Q17 | For uniform pressure the ratio of frictional torque for a flat collar bearing to the frictional torque for conical collar bearing is equal to____. Where ϴ=semi-angle of the cone
- 1.33
- 1
- sinϴ
- cosϴ
Q18 | For uniform wear, the ratio of frictional torque for a flat collar bearing to the frictional torque for conical collar bearing is equal to____. Where ϴ=semi-angle of the cone
- 1.33
- 1
- sinϴ
- cosϴ
Q19 | The ratio of frictional torque for a conical collar bearing to that for flat collar bearing is proportional to____. Where ϴ=semi-angle of the cone
- sinϴ
- cosϴ
- tanϴ
- 1/sinϴ
Q20 | For flat and conical pivots, the ratio of friction torque with uniform wear to friction torque with uniform pressure is ____.
- (2/3)
- (3/2)
- (4/3)
- (3/4)
Q21 | The ratio of frictional torque produced for uniform wear to frictional torque produced for uniform pressure is ____.
- (3/4)
- (4/3)
- (2/3)
- 1
Q22 | The frictional torque for the same diameter in a conical bearing is ____.
- more
- less
- equal
- may be more or less
Q23 | The frictional torque transmitted by a conical bearing is ____.
- less than that of flat collar bearing
- equal to that of flat collar bearing
- more than that of flat collar bearing
- none of the above
Q24 | The frictional torque produced due to friction for same shaft diameter, in conical bearing is____.
- less than that for flat collar bearing
- equal to that for flat collar bearing
- more than that for flat collar bearing
- may be more or less depending upon cone angle
Q25 | Choose the wrong statement
- the frictional torque transmitted by a shaft fitted with a large number of collars is the same as transmitted by a shaft with one collar
- the frictional force for uniform pressure, in case of a flat pivot bearing, can be assumed to be acting at a distance of two-thirds of the radius of the shaft from the axis of shaft.
- when horse power lost in friction is to be determined, uniform pressure is assumed for safe design of bearing
- the frictional force for uniform pressure, in case of a flat collar pivot bearing, can be assumed to be acting at a distance of half of the sum of internal and external radii of the shaft