DAY 31 WORKSHEET KWA - (Threading and Fasteners)

Which thread form has unequal flank angles specifically designed for heavy unidirectional thrust transmission?

• Square

• Buttress

• Metric

• Knuckle

The pitch diameter of a thread is defined as —

• Smallest diameter of thread

• Largest diameter of thread

• Diameter where thread thickness = space thickness

• Mean of major & minor diameters

Which thread series is specified in IS:4218?

• Whitworth

• Metric

• BA

• Unified

For ACME threads, the included angle is —

• 47.5°

• 55°

• 60°

• 29°

A Type C stud is preferred when threaded into —

• Steel body

• CI body

• Aluminium body

• Hardened steel body

Knuckle threads are semicircular in profile and are mostly used in hose couplings and valve fittings.

• True

• False

In a double-start thread, the lead is half the pitch.

• True

• False

Assertion (A): ACME threads are commonly used in power screws where high wear resistance is required. Reason (R): Their flank angle (29°) reduces wedging action and provides better sliding contact.

• A True, R True and R explains A

• A True, R True but R not explanation

• A True, R False

• A False, R True

In square threads, the depth of thread is equal to ............................

The lead of a triple-start thread is ..