MULTIPLE CHOICE QUESTIONS ON TRIBOLOGY

MULTIPLE CHOICE QUESTIONS ON TRIBOLOGY:-

1-The following is (are) the example(s) of static friction

1. Shoe brake applied to a vehicle
2. Shoe brake applied to a train
3. Dry grinding stone abrades the surface of metal
4. All of the above

(Ans: d)

2-As per laws of dry friction, the frictional force

1. depends upon the nature of sliding surface
2. is independent of the sliding velocity
3. is directly proportional to the load
4. All of the above

(Ans: d)

3-Lubricant converts

1. Solid friction into liquid friction
2. Liquid friction into solid friction
3. both ‘a’ and ‘b’
4. None of the above

(Ans: a)

4-The following is not a type of sliding contact bearing

1. Ball bearing
2. Journal bearing
3. Bush bearing
4. Thrust bearing

(Ans: a)

5- The following is not a type of roller contact bearing

1. Ball bearing
2. Journal bearing
3. Roller bearing
4. All of the above

(Ans: b)

6-In thrust bearings, the load acts

1. perpendicular to the axis of shaft
2. in axial direction
3. both ‘a’ and ‘b’
4. None of the above

(Ans: b)

7-Boundary friction conditions may develop in journal bearings, when shaft passes through zero speed during

1. starting
2. stopping
3. reversing
4. All of the above

(Ans: d)

8-The following lubricants are obtained by fractional distillation of petroleum

1. Mineral oils
2. Fatty oils
3. Solid lubricants
4. All of the above

(Ans: a)

9-For low pressure and low speeds, we use

1. Mineral oils
2. Semi-solid lubricants
3. Solid lubricants
4. All of the above

(Ans: c)

10-The pour point test is employed to indicate the suitability of oil for ____ temperature operations.

1. low
2. high
3. both ‘a’ and ‘b’
4. None of the above

(Ans: a)

11-The flash point of lubricant must be _______ the working temperature.

1. well below
2. well above
3. equal to
4. None of the above

(Ans: b)

12-Specific gravity of lubricant can be measured by using

1. Hydrometer
2. Viscometer
3. Anemometer
4. Pyranometer

(Ans: a)

13-API number of water is

1. 1
2. 5
3. 10
4. 20

(Ans: c)

14-The colour code for various grades of lubricants is as follows

Grade of lubricant	Colour code
A. Spindle oil	1. Red
B. Heavy-medium	2. Orange
C. Heavy/Extra heavy	3. Brown
D. Grease	4. Yellow

The correct order is

1. A-3, B-1, C-2, D-4
2. A-4, B-3, C-1, D-2
3. A-1, B-2, C-3, D-4
4. A-4, B-3, C-2, D-1

(Ans: b)

15-The bi-weekly lubrication is indicated by

1. rectangle
2. triangle
3. circle
4. hexagon

(Ans: c)

16-The monthly lubrication is indicated by

1. rectangle
2. triangle
3. circle
4. hexagon

(Ans: a)

17-Lubrication Oil from automobile machines come under ____ oil.

1. Clean oil
2. Less dirty
3. More dirty
4. Highly dirty

(Ans: d)

18-The six monthly lubrication is indicated by

1. rectangle
2. triangle
3. circle
4. hexagon

(Ans: d)