Test: Bearings - 3 - Mechanical Engineering MCQ

In a journal bearing, the radius of the friction circle increases with increase in

Which one of the following types of bearings is employed in shafts of gear boxes of automobiles

In a single row deep groove ball bearing cage is needed to

What is the main advantage of hydrodynamic bearing over roller bearing

In hydrodynamic bearings

In hydrostatic bearings

Which of the following bearing is preferred for oscillating conditions

Cage is not required in

Which one of the following is known as maximum capacity bearing?

If K = 3 for ball bearing and K = 3.33 for roller bearings. Which one of the following correctly states load (p) life (L) relationship for rolling contact bearings?

The bearing characteristic number in a hydrodynamic bearing depends upon

Which one of the following bearing is suitable for the application where large radial load at very high speed is use

Which one of the following is criterion in the design of hydrodynamic journal bearings

In sliding contact bearings, a positive pressure can be built up and a load supported by a fluid only by the use of a

It is seen from the curve that there is a minimum value of the coefficient of friction (m) for a particular value of the Bearing Characterstic Number denoted by a. What is this value of the Bearing Characteristic Number called?

A ball-bearing is characterized by basic static capacity = 11000 N and dynamic capacity = 18000 N. This bearing is subjected to equivalent static load = 5500 N. The bearing loading ratio and life in million revolutions respectively are

Consider the following statements:
For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is
1. Proportional to the area of contact
2. Proportional to the viscosity of lubricant
3. Proportional to the speed of rotation
4. Independent of the pressure
Q. Which of the statements given above are correct?

In three ball bearings identified as SKF 2015, 3115 and 4215

A journal has a shaft diameter of 40 mm and a length of 40 mm. The shaft rotating at 20 rad/s and the viscosity of the lubricant is 20 MPa.s. The clearance is 0.20 mm. The loss of torque due to the viscosity of the lubricant is approximately

A natural feed journal bearing of diameter 50 mm and length 50 mm operating at 20 revolution/sec. carries a load of 2.0 kN. The lubricant used has a viscosity of 20 MPa/s. The radial clearance is 50 μm. The Sommerfield number for the bearings is

The dynamic load capacity of 6306 is 22 kN. The maximum radial load it can sustain to operate at 600 rev/min, for 2000 hours is

The basic load rating of a ball bearing is

The life of a ball bearing at a load of 10 kN is 8000 hours. Its life in hours, if the load is increased to 20 kN, keeping all other conditions the same, is

Consider the following statements:
For a proper hydrodynamic lubrication for a given journal bearing
1. The higher the viscosity, the lower the rotating speed needed to float the journal at a given load.
2. The higher the rotating speed, the higher the bearing load needed to float the journal at a given viscosity.
3. The higher the bearing load, the higher the viscosity needed to float the journal at a given speed.
Q. Which of these statement are correct?

In a hydrodynamic journal bearing, there is

Consider the following statements:
The fatigue ‘L’ of rolling bearing is
1. Inversely proportional to the third power of the load for ball bearing.
2. Inversely proportional to the fourth power of the load for ball bearing.
3. Inversely proportional to the 10/3 power for roller bearing.
4. Inversely proportional to the third power of the load for roller bearing.

Which one of the following statement is not true of rolling contact bearing?