Q. A circular shaft is subjected to torque. The torsional rigidity is defined as
(A) ratio of torque and polar moment of inertia
(B) product of polar moment of inertia and modulus of rigidity
(C) sum of polar moment of inertia and modulus of rigidity
(D) product of torque and length
Q. The twisting moment of a circular shaft increases when
(A) polar moment of inertia decreases
(B) modulus of rigidity increases
(C) length of the shaft increases
(D) radius of the shaft decreases
Q. For a circular shaft under torsion, shear stress value at the centre of the shaft is
(A) minimum
(B) maximum
(C) unity
(D) zero
Q. Shear stress of a circular shaft is maximum at which of the following point?
(A) Inner surface of the shaft
(B) Outer surface of the shaft
(C) Center of the shaft
(D) Axis of the shaft
Q. Two similar shafts of same material,weight and length of which one is hollow and other is solid.In comparison to strength
(A) solid one is stronger
(B) hollow one is stronger
(C) both shafts are equally strong
(D) none of the above