Exercise: Machine Design

Questions for: Machine Design

A castle nut is a locking device in which
A:
a thinner nut is tightened down over a thicker or main nut and the main nut is tightened against the thinner nut by loosening
B:
a slot is cut in line with the centre of each face and a split pin passes through two slots in the nut and a hole in the bolt, so that a positive lock is obtained unless the pin shears
C:
a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction
D:
the bottom cylindrical portion is recessed to receive the tip of the locking set screw
Answer: B
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When carbon in the cast iron is in the form of cementite, the cast iron will be of white colour.
A:
Correct
B:
Incorrect
C:
D:
Answer: A
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The taper on a rectangular sunk key is
A:
1 in 16
B:
1 in 32
C:
1 in 48
D:
1 in 100
Answer: D
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The form factor of a helical gear __________ with the increase in the helix angle.
A:
increases
B:
decreases
C:
remains constant
D:
Answer: A
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A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zig-zag riveting is proposed. Which of the following statement is correct?
A:
There are four rivets per pitch length, all in double shear
B:
There are four rivets per pitch length, out of which two are in single shear and two are in double shear
C:
There are five rivets per pitch length, all in double shear
D:
There are five rivets per pitch length, out of which four are in double shear and one is in single shear
Answer: D
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