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421.

Which of the following joint is used for pipes carrying water under low pressures?

A.	Adhesive joint	B.	Socket joint
C.	Welded joint	D.	Expansion joint

422.

In case of pressure vessels having open ends the fluid pressure induces

A.	shear stress	B.	longitudinal compressive stress
C.	longitudinal tensile stress	D.	circumferential stress

423.

In case of worm and worm wheel drives, the axes of the two are

A.	parallel and non-intersecting	B.	non-parallel and intersecting
C.	non-parallel and non-intersecting	D.	parallel and intersecting

424.

Which of the following is not the result of cold work?

A.	Reduced hardness	B.	Reduced ductility
C.	Increased tensile strength	D.	Reduced shock resistance

425.

Which of the following alloying metal for steels acts as a deoxidizing and desulphurising agent?

A.	Nickel	B.	Chromium
C.	Manganese	D.	Tungsten

426.

Flexible shafts are made of

A.	thin mild steel rod	B.	hollow mild steel rod
C.	wavy steel wires

427.

Jaw clutches are generally used for

A.	low horse power low rpm applications	B.	high horse power high rpm applications
C.	low horse power high rpm applications	D.	high horse power low rpm applications

428.

A belt when struck vibrates at a particular frequency determined by

A.	shape of bell	B.	size of ball
C.	material of bell	D.	All of the above

429.

The critical speed of a shaft can be increased by

A.	bearings may be brought closer together	B.	reciprocating load may be applied
C.	shaft diameter may be increased	D.	frictionless bearings be used

430.

Wing screws are used where

A.	high torque is needed for tightening	B.	frequently manual locking and unlocking is necessary
C.	stress reversal is severe	D.	tight grip is essential