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Chapter:

6. Which of following represents correct symbol of vertified bond in a specification of grinding wheel?

V R B S

V

‘V’ represents for vertified bond. Fifth place of ISO designation of grinding wheel represents type of bond.

Hint Answer

7. Material removal rate in grinding operation is small due to

Negative rake angle Positive rake angle Zero rake angle Material removal rate does not depend on the rake angle

Negative rake angle

Grinding wheel have negative rake angle and hence have very small material removal rate. Hence grinding is mostly use as a finishing process.

Hint Answer

8. Grinding ratio generally lies between

0.5-10 100-200 1000-200 30-40

0.5-10

Grinding ratio = (volume of material removed/volume of wheel wear). G.R is generally between 0.5-10.

Hint Answer

9. Which of following is a surface finishing operation?

Drilling Lapping Milling Turning

Lapping

Lapping is a surface finishing operation used to give better surface finish and have very small material removal rate.

Hint Answer

10. Which of following grinding wheel specified in ISO designation will represent Resin 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

C 600 K 5 B 17

Fifth place of ISO designation of grinding wheel represents type of bond and “B” represents resin bond.

Hint Answer

11. A grinding wheel is specified as “A 8 K 5 P 17”. Which of following is correct about this grinding wheel?

Very fine grains Open structure Rubber bond Coarse grain

Coarse grain

‘8’ represents grain size, which is coarse.

Hint Answer

12. Which of following grinding machine will give a better result for rough machining?

Fine grain Very fine grain Coarse grain None of the mentioned

Coarse grain

Coarse grain wheel will give better metal removal rate and space for chip removal as rate of chip flow in rough machining is high.

Hint Answer

13. Which of following symbol’s range of alphabet represent medium hardness grain in grinding wheel?

A – H I – P Q – T T – Z

I – P

I-P represents medium hard grains in grinding wheel.

Hint Answer

14. Which of following grinding wheel would be more economical for grinding of hard work piece?

Open structure grinding wheel Dense structure wheel Both dense and open structure grinding wheel None of the mentioned

Dense structure wheel

In dense structure grinding wheels, during machining of hard work piece material removal rate is small and also wheel has good strength.

Hint Answer

15. Which of following is a correct range for grain number of grinding wheel for coarse grains?

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

10-24

For coarse grain, grain number ranges from 10 to 24.

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 represents correct symbol of vertified bond in a specification of grinding wheel?

Material removal rate in grinding operation is small due to

Grinding ratio generally lies between

Which of following is a surface finishing operation?

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

A grinding wheel is specified as “A 8 K 5 P 17”. Which of following is correct about this grinding wheel?

Which of following grinding machine will give a better result for rough machining?

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

Which of following grinding wheel would be more economical for grinding of hard work piece?

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

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