Thursday, January 31, 2019

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

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