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Chapter:

21. Which of following grinding wheel will have fine grain size?

A 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

Second place of ISO designation of grinding wheel represents grain size and “80” comes under fine rain size.

Hint Answer

22. Which of following grinding wheel specified in ISO designation will represent Shellac bond?

Z 46 K 5 E 17 C 600 K 5 B 17 C 8 K 5 R 17 A 80 K 5 V 17

Z 46 K 5 E 17

Fifth place of ISO designation of grinding wheel represents a type of bond and “E” represents shellac.

Hint Answer

23. Which of following symbol’s range of alphabet represent hard grain in grinding wheel?

D – H I – P A – D Q – Z

D – H

A-H represents soft grains in grinding wheel.

Hint Answer

24. Which of following will be better to use for machining of hard work piece?

V-bond R-bond Both V and R bond None of the mentioned

V-bond

Vertified bond grinding wheel is generally used for machining of hard work piece. Fifth place of ISO designation of grinding wheel represents type of bond.

Hint Answer

25. Which of following grinding wheel will have fine grain size?

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

C 8 K 5 B 17

Second place of ISO designation of grinding wheel represents grain size and “600” comes under very fine rain size.

Hint Answer

26. Loss in sharpness of grinding wheel due to presence of chips in gaps of grains is termed as

Loading Glazing Dressing Trueing

Loading

Loading decrease sharpness of grinding wheel, when foreign material comes in between free space of wheel.

Hint Answer

27. Which of following is correct range for grain number of grinding wheel for very fine grains?

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

220-600

For very fine grains, grain number ranges from 220 to 600.

Hint Answer

28. A grinding wheel is specified as “A 5 K 5 R 17”. Which of following is correct about this grinding wheel?

Very fine grains Open structure Aluminum oxide abrasive Coarse grain

Aluminum oxide abrasive

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

Hint Answer

29. During a honing process, reciprocating speed of honing tool was 9m/min with a cross hatch angle of 30 degree. Rotary speed in m/min is equal to

33.58 35 30 25.23

33.58

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

30. Operation done to make periphery of grinding wheel concentric with its axis to recover its lost shape is known as

Loading Glazing Dressing Trueing

Trueing

Trueing is done to make periphery of grinding wheel concentric with its axis and to recover its lost shape.

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 grinding wheel will have fine grain size?

Which of following grinding wheel specified in ISO designation will represent Shellac bond?

Which of following symbol’s range of alphabet represent hard grain in grinding wheel?

Which of following will be better to use for machining of hard work piece?

Which of following grinding wheel will have fine grain size?

Loss in sharpness of grinding wheel due to presence of chips in gaps of grains is termed as

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

A grinding wheel is specified as “A 5 K 5 R 17”. Which of following is correct about this grinding wheel?

During a honing process, reciprocating speed of honing tool was 9m/min with a cross hatch angle of 30 degree. Rotary speed in m/min is equal to

Operation done to make periphery of grinding wheel concentric with its axis to recover its lost shape is known as

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