Screw Threads MCQ - Machinist(Set-1) with Answers

1) The distance through which a screw thread advances axially in one turn is called :

Answer is:

Lead of thread

Explanation:

Lead is the distance of a threaded component moves along the matching component during one complete revolution. For a single start thread the lead is equal to the pitch.

The distance through which a screw thread advances axially in one turn is called :

2) The pitch of a 3-start is the lead divided by :

Answer is:

3

Explanation:

The pitch of a 3-start is the lead divided by 3

3) The angle of I.S. thread (V shaped) is :

Answer is:

60 Degree

Explanation:

The angle of I.S. thread (V shaped) is 60 Degree

4) What type of threads are suitable for small precision components and measuring gauges ?

Answer is:

British Association threads

Explanation:

This thread has an included angle of 47 1/2°. Depth and other elements are as shown in the figure. It is used in small screws of electrical appliances, watch screws, screws of scientific apparatus.

What type of threads are suitable for small precision components and measuring gauges ?

5) What type of threads are suitable for lead screws of machine tools ?

Answer is:

Acme threads

Explanation:

Acme threads are used in lathe lead screws. This form of thread enables the easy engagement of the half nut. The metric acme thread has an included angle of 30°.