Mechanical Engineering - Machine Design

1. 

Which of the following statement is correct?

A. The distance from a point on one thread to the corresponding point on the next thread is called pitch
B. The distance which a screw thread advances axially in one rotation of the nut is called lead
C. In single start threads, lead is equal to pitch
D. all of the above

Answer: Option D

Explanation:

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2. 

The taper on cotter and slot is made on both the sides.

A. Agree
B. Disagree

Answer: Option B

Explanation:

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3. 

Teflon is used for bearings because of

A. low coefficient of friction
B. better heat dissipation
C. smaller space consideration
D. all of these

Answer: Option A

Explanation:

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4. 

In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

A. 2 d
B. 3 d
C. 4 d
D. 5 d

Answer: Option B

Explanation:

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5. 

The acme threads are usually found on

A. spindles of bench vices
B. railway carriage couplings
C. feed mechanism of machine tools
D. screw cutting lathes

Answer: Option D

Explanation:

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