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Mechanical Engineering - Machine Design

Exercise : Machine Design - Section 11
26.
A castle nut is a locking device in which
a thinner nut is tightened down over a thicker or main nut and the main nut is tightened against the thinner nut by loosening
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
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
the bottom cylindrical portion is recessed to receive the tip of the locking set screw
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
If P1 is the initial tension due to tightening up the bolt and P2 is the external load on the bolt, then the resultant load (P) on a bolt may be obtained by using the relation (where a = Ratio of elasticity of connected parts to the elasticity of bolt)
P = P1 + P2
P = P1 - P2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
The application of second type levers is found in
handle of a hand pump
hand wheel of a punching press
lever of a loaded safety valve
a pair of tongs
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
The spindles of bench vices are usually provided with knuckle threads.
Agree
Disagree
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
According to Indian standards, total number of tolerance grades are
8
12
18
20
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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