GATE Mechanical Engineering Notes Pdf - 2

Question: 6

The concentric helical springs are wound in opposite direction

(A) to avoid binding of adjacent coils

(B) to maintain identical shear stress in the two springs

(C) to avoid unequal deflection in the two springs

(D) to maintain identical stiffness in both springs

Question: 7

Induction hardening of components is done

(A) to increase hardness on the surface only

(B) to increase hardness uniformly

(C) to increase the hardness of the core

(D) to increase hardness at the centre

Question: 8

Screw parts with a right hand thread must only be stressed

(A) in the plane of principal axis

(B) in the direction normal to the screw axis

(C) in the direction of screwing out

(D) in the direction of screwing in

Question: 9

Piston rings are usually made of

(A) aluminium

(B) high carbon steel

(C) stainless steel

(D) cast iron

Question: 10

In a beam, at the neutral axis,

(A) bending stress is zero

(B) shear stress is minimum and bending stress is zero

(C) bending stress is average value

(D) bending stress is minimum