A flat footstep bearing 10 cm radius supports a load of 3 kN. The shaft runs at 600/π r.p.m. and co-efficient of friction is 0.1. The friction torque and frictional power in watts with uniform wear are respectively.

not possible to find for insufficient data

For same μr and all wheels are impending slip, stopping distance for four wheel vehicle is _____

directly proportional to weight of vehicle

directly proportional to the velocity of vehicle

directly proportional to square of the velocity of the vehicle

directly proportional to weight of vehicle

Torque transmitted by single plate clutch with axial spring load = 1 kN, and inner and outer radii of 10 cm and 15 cm and µ = 0.5 with assumption of uniform wear is ____.

not possible to find with given data

Refer fig.3 Pivot point O3, force at A vertically up and if µ.d ≥ b then____.

the brake is self-locking in both the direction

the brake is self-locking in clockwise direction

the brake is self-locking in counter-clockwise direction

the brake is self-locking in both the direction

the brake is not self-locking in any direction

A flat footstep bearing 10 cm radius supports a load of 3 kN. The shaft runs at 600/π r.p.m. and co-efficient of friction is 0.1.The friction torque and frictional power in watts with uniform pressure are respectively.

not possible to find for insufficient data

Friction torque transmitted by a disc or plat clutch is same as that of ____.

truncated conical pivot bearing

A vehicle has weight W and co-efficient of tractive co-efficient μr. It is moving with velocity V when brakes are applied, and all the wheels are at impending slip. The stopping distance Is x. If weight is increased by 50% and μr decreased by 50% then _______

the stopping distance cannot be determined

the stopping distance remains same

the stopping distance increases by 50%

the stopping distance decrease by 50%

the stopping distance cannot be determined

Frictional torque as per uniform were theory is __________.

Î¼p(roÂ³-/riÂ³)/2 (roÂ²-/riÂ²)

Â½ Î¼p [(roÂ³+/riÂ³)/(roÂ²+/riÂ²)]

Î¼p(roÂ³-/riÂ³)/2 (roÂ²-/riÂ²)

The uniform wear condition are used__________

for maximum power to be transmitted

for overcoming the frictional torque

For safe design of brakes, we assume____.

neither uniform pressure nor uniform wear

Cooling water is used in________

epicyclic gear train dynamometer

In case of dynamometer function of counter weight is to _____

adjust pressure on pulley to control speed

balance the brake when unloaded

adjust pressure on pulley to control speed

prevent rotation of block due to fraction between block and pulley

Which of the following is classified as transmission dynamometer?

belt dynamometer or tathan dynamometer

The stopping distance for four wheel vehicle is______

unaltered by increase for four wheel vehicle

decrease with increase of Î¼r

directly proportional to square of velocity of vehicle

A vehicle has weight W and co-efficient of tractive co-efficient Î¼r. It is moving with velocity V when brakes are applied, and all the wheels are at impending slip. The stopping distance Is x. If weight is increased by 50% and Î¼r decreased by 50% then _______

the stopping distance cannot be determined

the stopping distance remains same

the stopping distance increases by 50%

the stopping distance decrease by 50%

the stopping distance cannot be determined

152 + Mcqs in Theory Of Mechanics in Mechanical Engineering Page 1 McqOptions

1.	A flat footstep bearing 10 cm radius supports a load of 3 kN. The shaft runs at 600/π r.p.m. and co-efficient of friction is 0.1. The friction torque and frictional power in watts with uniform wear are respectively.
A.	30 n-m and 600 watt
B.	15 n-m and 300 watts
C.	15 n-m and 600 watts
D.	not possible to find for insufficient data
Answer» C. 15 n-m and 600 watts

Discussion

2.	For same μr and all wheels are impending slip, stopping distance for four wheel vehicle is _____
A.	directly proportional to the velocity of vehicle
B.	directly proportional to square of the velocity of the vehicle
C.	directly proportional to weight of vehicle
D.	none of the above
Answer» C. directly proportional to weight of vehicle

Discussion

3.	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
A.	1.33
B.	1
C.	sinϴ
D.	cosϴ
Answer» D. cosϴ

Discussion

4.	Torque transmitted by single plate clutch with axial spring load = 1 kN, and inner and outer radii of 10 cm and 15 cm and µ = 0.5 with assumption of uniform wear is ____.
A.	250 n-m
B.	125 n-m
C.	62.5 n-m
D.	not possible to find with given data
Answer» D. not possible to find with given data

Discussion

5.	Refer fig.3 Pivot point O3, force at A vertically up and if µ.d ≥ b then____.
A.	the brake is self-locking in clockwise direction
B.	the brake is self-locking in counter-clockwise direction
C.	the brake is self-locking in both the direction
D.	the brake is not self-locking in any direction
Answer» C. the brake is self-locking in both the direction

Discussion

6.	A flat footstep bearing 10 cm radius supports a load of 3 kN. The shaft runs at 600/π r.p.m. and co-efficient of friction is 0.1.The friction torque and frictional power in watts with uniform pressure are respectively.
A.	10 n-m and 400 watts
B.	20 n-m and 400 watts
C.	30 n-m and 600 watts
D.	not possible to find for insufficient data
Answer» C. 30 n-m and 600 watts

Discussion

7.	For safe design, a frictional clutch is designed assuming ____.
A.	uniform pressure theory
B.	uniform wear theory
C.	any one of the two
D.	none of the above
Answer» C. any one of the two

Discussion

8.	Frictional torque transmission through multi plate clutch is equivalent to____.
A.	conical pivot bearing
B.	flat pivot bearing
C.	trapezoidal pivot bearing
D.	flat roller bearing
Answer» E.

Discussion

9.	A friction clutch should be designed on the assumption of
A.	uniform wear
B.	uniform pressure
C.	constant friction
D.	any one
Answer» B. uniform pressure

Discussion

10.	The frictional torque transmitted by a disc clutch is same as that of _____.
A.	flat pivot bearing
B.	flat collar bearing
C.	conical pivot bearing
D.	trapezoidal pivot bearing
Answer» C. conical pivot bearing

Discussion

11.	The equivalent coefficient of friction for a cone clutch is ____.
A.	µ sinα
B.	µ tanα
C.	µ/sinα
D.	µ/tanα
Answer» D. µ/tanα

Discussion

12.	Determine the axial force required to engage a cone clutch transmitting 25 kW power at 750 rpm. Average friction diameter of the cone is 400 mm, semicone angle 10 degree and coefficient of friction 0.25.
A.	325.30 nm and 1100.25 n
B.	318.31 nm and 1105.47 n
C.	320.25 nm and 1008.20 n
D.	325.89 nm and 1120.30 n
Answer» C. 320.25 nm and 1008.20 n

Discussion

13.	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
A.	1.33
B.	1
C.	sinϴ
D.	cosϴ
Answer» D. cosϴ

Discussion

14.	Friction torque transmitted by a disc or plat clutch is same as that of ____.
A.	flat pivot bearing
B.	flat collar bearing
C.	conical pivot bearing
D.	truncated conical pivot bearing
Answer» C. conical pivot bearing

Discussion

15.	For multiple plate friction clutch with n plates, the number of active surfaces n
A.	n
B.	n+1
C.	n-1
D.	n/2
Answer» B. n+1

Discussion

16.	A vehicle has weight W and co-efficient of tractive co-efficient μr. It is moving with velocity V when brakes are applied, and all the wheels are at impending slip. The stopping distance Is x. If weight is increased by 50% and μr decreased by 50% then _______
A.	the stopping distance remains same
B.	the stopping distance increases by 50%
C.	the stopping distance decrease by 50%
D.	the stopping distance cannot be determined
Answer» D. the stopping distance cannot be determined

Discussion

17.	Frictional torque transmission through plate clutch is equivalent to____
A.	conical pivot bearing
B.	flat pivot bearing
C.	trapezoidal pivot bearing
D.	flat roller bearing
Answer» E.

Discussion

18.	A multiple clutch with 5 plate transmits torque of 400 N-m. If µ = 0.5 and inner radius = 10 cm and outer radius = 15 cm and four spring expert-axial and load per spring is ___.
A.	200 n
B.	300 n
C.	400 n
D.	1280 n
Answer» D. 1280 n

Discussion

19.	A bicycle and rider is mass 125 kg are travelling at speed of 10km/hr. The rider applies a break to the near wheel of 1 m diameter. How far the bicycle will travel before it comes to rest? The pressure applied to the brake is 120 N and μ = 0.05. Also find the number of revolutions made by bicycle before coming to rest.
A.	24.58
B.	25.58
C.	23.79
D.	35.48
Answer» C. 23.79

Discussion

20.	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
A.	sinϴ
B.	cosϴ
C.	tanϴ
D.	1/sinϴ
Answer» E.

Discussion

21.	Frictional torque as per uniform were theory is __________.
A.	Î¼p (ro+/ri)
B.	Â½ Î¼p (ro+/ri)
C.	Â½ Î¼p [(roÂ³+/riÂ³)/(roÂ²+/riÂ²)]
D.	Î¼p(roÂ³-/riÂ³)/2 (roÂ²-/riÂ²)
Answer» D. Î¼p(roÂ³-/riÂ³)/2 (roÂ²-/riÂ²)

Discussion

22.	According to uniform were theory frictional torque transmitted by conical pivot bearing is ________.
A.	2/3 (Î¼ w r cosec Î±)
B.	1/2 (Î¼ w r cosec Î±)
C.	1/2 (Î¼ w r cos Î±)
D.	Î¼ w r cosec Î±
Answer» C. 1/2 (Î¼ w r cos Î±)

Discussion

23.	The ratio of friction torque for uniform pressure to uniform were for the same dimensions and load is _____________.
A.	>1
B.	=1
C.	<1
D.	=1/2
Answer» B. =1

Discussion

24.	According to uniform wear theory____. Where, w=Angular velocity of shaft, r=radius of shaft, W=Axial lead on shaft
A.	pw=constant
B.	pr=constant
C.	pt=constant
D.	pw=constant
Answer» C. pt=constant

Discussion

25.	According to uniform wear theory____. Where,w=Angular velocity of shaft, r=radius of shaft, W=Axial lead on shaft
A.	pw=constant
B.	pr=constant
C.	pt=constant
D.	pw=constant
Answer» C. pt=constant

Discussion

26.	The uniform wear condition are used__________
A.	for maximum power to be transmitted
B.	for safe design of clutches
C.	for safe design of bearing
D.	for overcoming the frictional torque
Answer» C. for safe design of bearing

Discussion

27.	For safe design of brakes, we assume____.
A.	uniform pressure conditions
B.	uniform wear condition
C.	neither uniform pressure nor uniform wear
D.	all of the above
Answer» B. uniform wear condition

Discussion

28.	A torsion dynamometer is fitted on turbine shaft to measure the angle of twist. The shaft twist 1.60 for a length of 8 meters at 600 rpm. The diameter of shaft is 250 mm. Find the power transmitted by the turbine. Take G= 80 GPa
A.	68.22 kw
B.	67.22 kw
C.	65.22 kw
D.	66.32 kw
Answer» C. 65.22 kw

Discussion

29.	The following data refer to a laboratory experiment with rope brake____.Diameter of the flywheel=1m Diameter of the rope = 10mm , Dead weight on the brake = 50kg , Speed of the engine = 200rpm , Spring balance reading = 120N . Find brake power of the engine.
A.	3.91 kw
B.	2.90 kw
C.	4.90 kw
D.	3.80 kw
Answer» B. 2.90 kw

Discussion

30.	Tathem dynamometer is name given to______
A.	rope brake dynamometer
B.	belt transmission dynamometer
C.	absorption dynamometer
D.	epicyclic train dynamometer
Answer» C. absorption dynamometer

Discussion

31.	Cooling water is used in________
A.	prony brake dynamometer
B.	epicyclic gear train dynamometer
C.	torsion dynamometer
D.	rope brake dynamometer
Answer» E.

Discussion

32.	In case of dynamometer function of counter weight is to _____
A.	balance the brake when unloaded
B.	adjust pressure on pulley to control speed
C.	prevent rotation of block due to fraction between block and pulley
D.	to clamp the blocks
Answer» B. adjust pressure on pulley to control speed

Discussion

33.	In case of Glibson flash light torsion dynamometer angle of twist can be measured up to _______
A.	1/20th of degree
B.	1/10th of degree
C.	1/70th of degree
D.	1/100th of degree
Answer» E.

Discussion

34.	Which of the following is classified as transmission dynamometer?
A.	torsion dynamometer
B.	froude\s hydraulic dynamometer
C.	belt dynamometer or tathan dynamometer
D.	prony brake dynamometer
Answer» D. prony brake dynamometer

Discussion

35.	An example of a transmission dynamometer is______
A.	prony brake dynamometer
B.	rope brake dynamometer
C.	froude dynamometer
D.	torsion dynamometer
Answer» E.

Discussion

36.	Which of the following is classified as absorption dynamometer?
A.	prony brake dynamometer
B.	rope brake dynamometer
C.	froude\s hydraulic dynamometer
D.	all of the above
Answer» D. all of the above

Discussion

37.	Which of the following is an absorption type dynamometer?
A.	prony brake dynamometer
B.	rope brake dynamometer
C.	epicyclic-train dynamometer
D.	both a and b
Answer» E.

Discussion

38.	Which of the following is classified as transmission type of dynamometer?
A.	prony brake dynamometer
B.	rope brake dynamometer
C.	hydraulic dynamometer
D.	epicyclic dynamometer
Answer» E.

Discussion

39.	An example of an absorption type dynamometer is ___
A.	prony brake dynamometer
B.	epicyclic train dynamometer
C.	torsion dynamometer
D.	belt transmission dynamometer
Answer» B. epicyclic train dynamometer

Discussion

40.	Which of the following is classified a absorption type of dynamometer?
A.	prony brake dynamometer
B.	rope brake dynamometer
C.	hydraulic dynamometer
D.	all of the above
Answer» E.

Discussion

41.	Dynamometer is a device for measuring ____
A.	torque exerted by the machine
B.	power developed by the machine
C.	power absorbed by the machine
D.	all of the above
Answer» E.

Discussion

42.	A dynamometer is a device used for measuring
A.	power developed by a machine
B.	torque developed by a machine
C.	power absorbed by a machine
D.	all the above
Answer» E.

Discussion

43.	In a simple band brake applied to a shaft carrying a flywheel of mass 250kg and radius of gyration 350mm , one end of the band is attached to the fulcrum and the other at a distance 300 mm from the fulcrum. The angle embraced by the band is 2250 and the brake drum diameter is 220 mm coefficient of friction 0.25 and the shaft speed is 300 rpm clockwise. Determine the brake torque when a force of 150 N is applied
A.	102.99 n
B.	105.24 n
C.	103.26 n
D.	195.38 n
Answer» D. 195.38 n

Discussion

44.	A bicycle and rider is mass 125 kg are travelling at speed of 10km/hr. The rider applies a break to the near wheel of 1 m diameter. How far the bicycle will travel before it comes to rest? The pressure applied to the brake is 120 N and Î¼ = 0.05. Also find the number of revolutions made by bicycle before coming to rest.
A.	24.58
B.	25.58
C.	23.79
D.	35.48
Answer» C. 23.79

Discussion

45.	For above question determine the required force 'P' to be applied when the rotation of drum is anticlockwise.
A.	378.99 n
B.	420.99 n
C.	435.45 n
D.	450.38 n
Answer» B. 420.99 n

Discussion

46.	A single block brake as shown in Fig.6 has a brake drum diameter of 1m and the angle of contact is 300. It takes 280 Nm torque at 300rpm. The coefficient of friction is 0.35. Determine the required force 'P' to be applied when the rotation of drum is clockwise.
A.	378.99 n
B.	420.99 n
C.	435.45 n
D.	450.38 n
Answer» C. 435.45 n

Discussion

47.	In a band brake the ratio of tight side band tension to the tension on the slack side is 3. If the angle of band on the drum is 1800 the coefficient of friction required between drum and band is_____
A.	0.2
B.	0.25
C.	0.3
D.	0.35
Answer» E.

Discussion

48.	Find the brake power of the engine running at 755 rpm. The length of lever from center of pulley is 1.43 m. The weight in pan is 40 kg.
A.	40 kw
B.	42.44 kw
C.	44.36 kw
D.	45.41 kw
Answer» D. 45.41 kw

Discussion

49.	The stopping distance for four wheel vehicle is______
A.	unaltered by increase for four wheel vehicle
B.	decrease with increase of Î¼r
C.	directly proportional to square of velocity of vehicle
D.	all the above
Answer» E.

Discussion

50.	A vehicle has weight W and co-efficient of tractive co-efficient Î¼r. It is moving with velocity V when brakes are applied, and all the wheels are at impending slip. The stopping distance Is x. If weight is increased by 50% and Î¼r decreased by 50% then _______
A.	the stopping distance remains same
B.	the stopping distance increases by 50%
C.	the stopping distance decrease by 50%
D.	the stopping distance cannot be determined
Answer» D. the stopping distance cannot be determined

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

A flat footstep bearing 10 cm radius supports a load of 3 kN. The shaft runs at 600/π r.p.m. and co-efficient of friction is 0.1. The friction torque and frictional power in watts with uniform wear are respectively.

For same μr and all wheels are impending slip, stopping distance for four wheel vehicle is _____

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

Torque transmitted by single plate clutch with axial spring load = 1 kN, and inner and outer radii of 10 cm and 15 cm and µ = 0.5 with assumption of uniform wear is ____.

Refer fig.3 Pivot point O3, force at A vertically up and if µ.d ≥ b then____.

A flat footstep bearing 10 cm radius supports a load of 3 kN. The shaft runs at 600/π r.p.m. and co-efficient of friction is 0.1.The friction torque and frictional power in watts with uniform pressure are respectively.

For safe design, a frictional clutch is designed assuming ____.

Frictional torque transmission through multi plate clutch is equivalent to____.

A friction clutch should be designed on the assumption of

The frictional torque transmitted by a disc clutch is same as that of _____.

The equivalent coefficient of friction for a cone clutch is ____.

Determine the axial force required to engage a cone clutch transmitting 25 kW power at 750 rpm. Average friction diameter of the cone is 400 mm, semicone angle 10 degree and coefficient of friction 0.25.

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

Friction torque transmitted by a disc or plat clutch is same as that of ____.

For multiple plate friction clutch with n plates, the number of active surfaces n

A vehicle has weight W and co-efficient of tractive co-efficient μr. It is moving with velocity V when brakes are applied, and all the wheels are at impending slip. The stopping distance Is x. If weight is increased by 50% and μr decreased by 50% then _______

Frictional torque transmission through plate clutch is equivalent to____

A multiple clutch with 5 plate transmits torque of 400 N-m. If µ = 0.5 and inner radius = 10 cm and outer radius = 15 cm and four spring expert-axial and load per spring is ___.

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

Frictional torque as per uniform were theory is __________.

According to uniform were theory frictional torque transmitted by conical pivot bearing is ________.

The ratio of friction torque for uniform pressure to uniform were for the same dimensions and load is _____________.

According to uniform wear theory____. Where, w=Angular velocity of shaft, r=radius of shaft, W=Axial lead on shaft

According to uniform wear theory____. Where,w=Angular velocity of shaft, r=radius of shaft, W=Axial lead on shaft

The uniform wear condition are used__________

For safe design of brakes, we assume____.

A torsion dynamometer is fitted on turbine shaft to measure the angle of twist. The shaft twist 1.60 for a length of 8 meters at 600 rpm. The diameter of shaft is 250 mm. Find the power transmitted by the turbine. Take G= 80 GPa

The following data refer to a laboratory experiment with rope brake____.Diameter of the flywheel=1m Diameter of the rope = 10mm , Dead weight on the brake = 50kg , Speed of the engine = 200rpm , Spring balance reading = 120N . Find brake power of the engine.

Tathem dynamometer is name given to______

Cooling water is used in________

In case of dynamometer function of counter weight is to _____

In case of Glibson flash light torsion dynamometer angle of twist can be measured up to _______

Which of the following is classified as transmission dynamometer?

An example of a transmission dynamometer is______

Which of the following is classified as absorption dynamometer?

Which of the following is an absorption type dynamometer?

Which of the following is classified as transmission type of dynamometer?

An example of an absorption type dynamometer is ___

Which of the following is classified a absorption type of dynamometer?

Dynamometer is a device for measuring ____

A dynamometer is a device used for measuring

For above question determine the required force 'P' to be applied when the rotation of drum is anticlockwise.

A single block brake as shown in Fig.6 has a brake drum diameter of 1m and the angle of contact is 300. It takes 280 Nm torque at 300rpm. The coefficient of friction is 0.35. Determine the required force 'P' to be applied when the rotation of drum is clockwise.

In a band brake the ratio of tight side band tension to the tension on the slack side is 3. If the angle of band on the drum is 1800 the coefficient of friction required between drum and band is_____

Find the brake power of the engine running at 755 rpm. The length of lever from center of pulley is 1.43 m. The weight in pan is 40 kg.

The stopping distance for four wheel vehicle is______

A vehicle has weight W and co-efficient of tractive co-efficient Î¼r. It is moving with velocity V when brakes are applied, and all the wheels are at impending slip. The stopping distance Is x. If weight is increased by 50% and Î¼r decreased by 50% then _______