Mechanical Engineering - Machine Design

6. 

The toughness of a material __________ when it is heated.

A. increases
B. decreases
C. does not change

Answer: Option B

Explanation:

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7. 

The number of slots in a 25 mm castle nut is

A. 2
B. 4
C. 6
D. 8

Answer: Option C

Explanation:

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8. 

A screw is said to be over hauling screw, if its efficiency is

A. less than 50%
B. more than 50%
C. equal to 50%
D. none of these

Answer: Option B

Explanation:

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9. 

The application of third type levers is found in

A. handle of a hand pump
B. hand wheel of a punching press
C. lever of a loaded safety valve
D. a pair of tongs

Answer: Option D

Explanation:

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10. 

For unequal width of butt straps, the thickness of butt straps are

A. 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
B. 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
C. 0.75 t for both the straps on the inside and outside
D. 0.625 t for both the straps on the inside and outside

Answer: Option A

Explanation:

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