For a hydrostatic thrust bearing,Thrust load=450kN, shaft speed=730rpm, shaft diameter=450mm, recess diameter=310mm,film thickness=0.15mm,viscosity of lubricant=160SUS and specific gravity=0.86.

nCalculate power loss in pumping.

In hydrodynamic lubrication, film thickness remains unaffected by change in speeds.

Decrease with increase in speed

Increase with increase in speed

Decrease with increase in speed

Disappear as the speed tends to infinty

Which of the following are not true for petroff s equation?

Shaft is considered concentric with the bearing

Bearing is subjected to light load

Is used to find coefficient of friction

Frictional torque is given by fpr l

Viscosity is defined as the external resistance offered by a fluid to change its shape or relative motion of its parts.

It is not offered but exerted on the fluids

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1.	For a hydrostatic thrust bearing, Thrust load=450kN, shaft speed=730rpm, shaft diameter=450mm, recess diameter=310mm,film thickness=0.15mm,viscosity of lubricant=160SUS and specific gravity=0.86.
A.	nCalculate power loss in pumping.
B.	2.68kW
C.	3.35kW
D.	2.6kW
E.	4.2kW
Answer» D. 2.6kW

Discussion

2.	For a hydrostatic thrust bearing, Thrust load=450kN, shaft speed=730rpm, shaft diameter=450mm, recess diameter=310mm, film thickness=0.15mm, viscosity of lubricant=160SUS and specific gravity=0.86.
A.	nCalculate supply pressure
B.	10.2Pa
C.	4.01Pa
D.	4.01Mpa
E.	10.2Mpa
Answer» D. 4.01Mpa

Discussion

3.	In hydrodynamic lubrication, film thickness remains unaffected by change in speeds.
A.	True
B.	Increase with increase in speed
C.	Decrease with increase in speed
D.	Disappear as the speed tends to infinty
Answer» C. Decrease with increase in speed

Discussion

4.	Which of the following are not true for petroff s equation?
A.	Shaft is considered concentric with the bearing
B.	Bearing is subjected to light load
C.	Is used to find coefficient of friction
D.	Frictional torque is given by fpr l
Answer» E.

Discussion

5.	Viscosity is defined as the external resistance offered by a fluid to change its shape or relative motion of its parts.
A.	Yes
B.	It is internal resisting force
C.	It is not offered but exerted on the fluids
D.	None of the listed
Answer» C. It is not offered but exerted on the fluids

Discussion

Explore topic-wise MCQs in Machine Design.

For a hydrostatic thrust bearing,Thrust load=450kN, shaft speed=730rpm, shaft diameter=450mm, recess diameter=310mm,film thickness=0.15mm,viscosity of lubricant=160SUS and specific gravity=0.86.

For a hydrostatic thrust bearing,Thrust load=450kN, shaft speed=730rpm, shaft diameter=450mm, recess diameter=310mm, film thickness=0.15mm, viscosity of lubricant=160SUS and specific gravity=0.86.

In hydrodynamic lubrication, film thickness remains unaffected by change in speeds.

Which of the following are not true for petroff s equation?

Viscosity is defined as the external resistance offered by a fluid to change its shape or relative motion of its parts.

For a hydrostatic thrust bearing,
Thrust load=450kN, shaft speed=730rpm, shaft diameter=450mm, recess diameter=310mm,film thickness=0.15mm,viscosity of lubricant=160SUS and specific gravity=0.86.

For a hydrostatic thrust bearing,
Thrust load=450kN, shaft speed=730rpm, shaft diameter=450mm, recess diameter=310mm, film thickness=0.15mm, viscosity of lubricant=160SUS and specific gravity=0.86.