# A water cooled bearing having the following dimensions has operated at 600 rpm under 9000 N load with automobile oil for a number of years without any trouble. The viscosity of this at the oil temperature of 500 C in 0.050 kg/ms. Journal diameter = 50 mm, Bearing length = 80 mm, Radial clearance = 0.25 mm. What changes should be made in oil if bearing is given a radial clearance of 0.015 mm, i.e. viscosity of oil will be

1.  0.25 kg/ms

2.  0.018 kg/ms

3.  0.75 kg/ms

4.  0.020 kg/ms

4

0.018 kg/ms

Explanation :
No Explanation available for this question

# The most suitable bearing for carrying very heavy loads with slow speed is

1.  Hydrodynamic bearing

2.  Ball bearing

3.  Roller bearing

4.  Hydrostatic bearing

4

Hydrostatic bearing

Explanation :
No Explanation available for this question

# Thrust bearing of sliding type are often provided with multiple sector-shaped bearing pads of the filling type instead of a continuous angular bearing surface in order to

1.  Distribute the thrust load more non-uniformly

2.  Provide limited adjustments to shaft misalignments

3.  Enable the formation of a wedge-shaped oil film

4.  Enable lubricating or to come into contact with the total bearing area

4

Enable the formation of a wedge-shaped oil film

Explanation :
No Explanation available for this question

# For a radial ball bearing the desired rated life is 5000 hours for a speed of 1200 rev/min and radial load of 5 kN. The basic load rating for the bearing will be

1.  30 kN

2.  35.6 kN

3.  32.5 kN

4.  40.5 kN

4

35.6 kN

Explanation :
No Explanation available for this question

# In red wood visco meter

1.  Absolutevalue of viscosity is determined

2.  Part of the head of fluids utilised in overcoming friction

3.  Fluid discharges through orifice with negligible velocity

4.  Comparison of viscosity is done

4

Comparison of viscosity is done

Explanation :
No Explanation available for this question

# Centre of buoyancy is

1.  The point of intersection of buoyant force and centre line of the body

2.  Centre of gravity of the body

3.  Centroid of displaced volume fluid

4.  mid point between C.G. and meta centre

4

Centroid of displaced volume fluid

Explanation :
No Explanation available for this question

# Length of mercury column at a place at an altitude will vary with respect to that at ground in a

1.  Linear relation

2.  Hyperbolic relation

3.  Parabolic relation

4.  Manner first slowly and then steeply

4

Manner first slowly and then steeply

Explanation :
No Explanation available for this question

# With rise in gas temperature , dynamic viscosity of most of the gases

1.  Increases

2.  Decreases

3.  Does not change significantly

4.  None of the above

4

Increases

Explanation :
No Explanation available for this question

# A small plastic boat loaded with pieces of steel rods is floating in a bath tub. If the cargo is dumped in to the water allowing the boat to float empty, the water level in the tub will

1.  Rise

2.  Fall

3.  Remains same

4.  Rise and then fall

4

Fall

Explanation :
No Explanation available for this question

# Buoyant force is

1.  Resultant of up thrust and gravity forces acting on the body

2.  Resultant force on the body due to the fluid surrounding it

3.  Resultant of static weight of body and dynamic thrust of fluid

4.  Equal to the volume of liquid displaced by the body

4