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Chapter:

1. Which of following range of numbers represents open structure of abrasives?

0-3 4-6 8-16 None of the mentioned

8-16

8 ? 16 represents open structure. It represents distance between grain in grinding wheel.

Hint Answer

2. Which of following represents correct symbol of Shellac bond in a specification of grinding wheel?

V P B S

P

‘P’ represents for shellac bond. Fifth place of ISO designation of grinding wheel represents type of bond.

Hint Answer

3. Which of following is a correct range for grain number of grinding wheel for fine grains?

220-600 80-180 30-60 10-24

80-180

For fine grains, grain number ranges from 80 to 180.

Hint Answer

4. Which of following process has lowest cutting speed?

Drilling Honing Milling Turning

Honing

Honing is a surface finishing operation and hence it is generally performed at low speed.

Hint Answer

5. Which of following specified grinding wheel will have Aluminum oxide abrasive?

Z 46 K 5 B 17 C 600 K 5 B 17 C 8 K 5 B 17 A 80 K 5 B 17

A 80 K 5 B 17

First place of ISO designation of grinding wheel represents grain type and “A” represents aluminum oxide.

Hint Answer

6. During a honing process, reciprocating speed of honing tool was 9m/min with a rotary speed of 25m/min. Cross hatch angle in degrees is equal to

40 35 30 25

40

tan(X) = (Reciprocating speed in m/min)/ (Rotary speed in m/min). Cross hatch angle = 2*X, where ‘X’ is cross hatch angle.

Hint Answer

7. A grinding wheel is specified as “C 10 K 8 R 17”. Which of following is correct about this grinding wheel?

Very fine grains Open structure Aluminum oxide abrasive Coarse grain

Open structure

Fourth place of ISO designation of grinding wheel represents Structure and “8” comes under open structure.

Hint Answer

8. Removing dull grains in order to make grinding wheel sharp is known as

Loading Glazing Dressing Trueing

Dressing

Dressing is done to make grinding wheel shaft by removing dull grains at top.

Hint Answer

9. Which of following represents correct symbol of Silicate bond in a specification of grinding wheel?

V R B S

S

‘S’ represents for Silicate bond. Fifth place of ISO designation of grinding wheel represents type of bond.

Hint Answer

10. Which of following is correct grain size range of abrasive grains for honing stones?

800 grit to 1000 grit 5 grit to 10 grit 50 grit to 60 grit 80 grit to 600 grit

80 grit to 600 grit

80 grit to 600 grit is correct grain size range of abrasive grains for honing stones.

Hint Answer

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Topics

This Chapter consists of the following topics

Grinding

Surface Finishing Operations and Unconventional Machining Processes

Which of following range of numbers represents open structure of abrasives?

Which of following represents correct symbol of Shellac bond in a specification of grinding wheel?

Which of following is a correct range for grain number of grinding wheel for fine grains?

Which of following process has lowest cutting speed?

Which of following specified grinding wheel will have Aluminum oxide abrasive?

During a honing process, reciprocating speed of honing tool was 9m/min with a rotary speed of 25m/min. Cross hatch angle in degrees is equal to

A grinding wheel is specified as “C 10 K 8 R 17”. Which of following is correct about this grinding wheel?

Removing dull grains in order to make grinding wheel sharp is known as

Which of following represents correct symbol of Silicate bond in a specification of grinding wheel?

Which of following is correct grain size range of abrasive grains for honing stones?

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