GRINDING MCQ FOR SEM 2

1) Which one of the following bonds is most commonly used on grinding wheels?

Vitrified

Shellac

Rubber

Silicate 

2) The cause for glazing of a grinding wheel is ......

A) grain size is too fine

B) wheel is hard.

C) ‘A’ and ‘B’ both

D) wheel speed is too fast

3) As per Indian Standards, the grain size ‘46’ comes under the group

medium

very fine

fine

coarse

4) A grinding wheel marked with ‘C’ is made with the abrasive

Diamond

Corundum

Silicon carbide

Aluminum oxide

5) As per Indian Standards, the ‘M’ grade of grinding wheel comes under the group

soft

hard

medium

very hard

6) The symbol conventionally used for the resinoid bond is

‘V’

‘B’

‘R’

‘E’

7) A grinding wheel is marked: 51 A 46 L 5 V —23. Here what does 5 denote?

Kind of bond

Grain size

Kind of abrasive

Structure

8) Balancing of the wheel is done to

make the sides of the wheel parallel.

make the outside diameter concentric with the bore.

equalize the weight in every position of the wheel

none of the above

9) Grinding fluids are used to

reduce the friction between the wheel face and the job.

wash away chips.

prevent loading of the wheel.

all of the above.

10) For cylindrical grinding a small diameter work with a fairly large wheel, which among the following grades of the wheel should be used?

Soft

Medium

Hard

Very soft

11) Which one of the following is NOT the cause for glazing of the wheel?

Feed rate is too fine

The improper dressing of wheel

Hard wheel in place of the soft wheel

Dirty coolant

12) The effect of using a glazed or loaded wheel is

more heat generation.

poor surface finish.

excessive culling pressure between the wheel face

and the work surface.

all the above

13) Which among the following is NOT the cause for loading of grinding wheel?

Proper grain size and grade of wheel

Wheel speed more than recommended.

Dense structure

Feed too fine

14) It is commonly observed that the face of a grinding wheel becomes shiny and smooth or glazed after some use due to one of the following reasons. Choose the correct answer.

Structure of the wheel is too open

Grain size is too coarse

The grade of the wheel is too hard

Abrasive of the wheel is not suitable for the purpose

15) What is the cause of a grinding wheel becoming glazed in a grinding machine?

Grinding wheels grade is too soft

Feed and traverse are less

Grinding wheel’s speed is too high and work speed is low

Grinding wheel’s grade is too large

16) Which one the following features, refers to vitrified bond wheels?

Suitable for wet and dry grinding

Used for a longer period due to the dense structure

Used for a longer period due to an elastic structure

Not sensitive to shocks and pressure

17) You have to select a grinding wheel with suitable abrasive to grind glass. What is the type of abrasive you ‘will select?

Emery

Silicon carbide

Quartz

Diamond

18) Dressing and truing of a grinding wheel are

only for form grinding wheels

done only for coarse grinding wheels

exactly the same operation

done with the same equipment

20) Which one of the following cutting fluids are used during grinding mild steel?

Paraffin

Mineral oil

Non-synthetic cutting oil

Soluble oil