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Practice Set - 57              Marks - 75

1. In a unilateral system of tolerance, the tolerance is allowed on

A. one side of the actual size

B. one side of the nominal size
C. both sides of the actual size
D. both sides of the nominal size

2. A two high rolling mill consists of two rolls which rotate


A. at the same speed and in the same direction

B. at the same speed but in opposite direction
C. at different speeds and in the same direction
D. at different speeds and in the opposite direction

3. Carburising flame is used to weld


A.steel, cast iron, copper, aluminium etc

B.brass and bronze
C.hard surfacing materials such as stellite
D.all of these

4. The electrode tip diameter (d) in spot welding should be equal to (where t = Thickness of plate to be welded)


A.t

B.1.5 t
C.3 t
D.6 t

5. For obtaining a cup of diameter 25 mm and height 15 mm by drawing, the size of the round blank should be approximately


A.42 mm

B.44 mm
C.46 mm
D.48 mm

6. Cores are used to


A. form internal cavities in the casting

B. improve mould surface
C. form a part of a green sand mould
D. all of these

7. The drawing down is a process of ______ the cross-section of a bar.


A.increasing

B.reducing

8. During hot working of metals


A.poor surface finish is produced

B.scale is formed on the metal surface
C  .close tolerances can not be maintained
D.all of these

9. When a pattern is made in three parts, the ______ is known as a drag.


A. bottom part

B. middle part
C. top part

10. Shrinkage allowance is made by adding to external dimensions and subtracting from internal dimensions.


A.Agree

B.Disagree

11.  Galvanising is a


A.zinc diffusion process

B.process of coating zinc by hot dipping
C.process used for making thin phosphate coating on steel
D.none of the above

12. The ferrous metals require more machining allowance than non-ferrous metals.


A.True

B.False

13. In a four high rolling mill, there are four rolls out of which


A. one is working roll and three are backing up rolls

B.two are working rolls and two are backing up rolls
C.three are working rolls and one is backing up roll
D.all of the four are working rolls

14. When a pattern is made in three parts, the bottom part is known as a cope.


A.True

B.False

15. In __ welding, the weld may be made either from left to right or from right to left.

A.fore-hand
B.back-hand
C.verticalhttps://www.instamojo.com/bihargaya93/fitter-theory/?discount=new50

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