Theory Of Mechanics Set 1

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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