3) 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 ?

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4) 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°.

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

5) Which one of the following screw thread forms has an included angle of 29 Degree between the flanks of thread ?

Answer is:

Acme thread

Explanation:

The American Acme form has an included flank angle of 29-degrees. The metric Trapezoidal thread is at 30-degrees.

Which one of the following screw thread forms has an included angle of 29 Degree between the flanks of thread ?

6) The pitch diameter of the external screw thread is checked by

Answer is:

Screw thread micrometer

Explanation:

Screw thread micrometer is used to measure the effective diameter of the screw threads. This dimension is important, because the area of the thread flanks in the vicinity of the pitch line is where the greatest transmission of force occurs between mating threads.