Fourteen MCQ’s on Torsion
QUESTION.1. The unit of Torque in SI units
(a) kg-m
(b) kg-cm
(c) N-m
(d) N/m2
QUESTION.2. When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under
(a) Tensile stress
(b) Compressive stress
(c) Shear stress
(d) All of these
QUESTION.3. The shear stress is minimum at
(a) Axis of the shaft
(b) Outer surface of the shaft
(c) Anywhere inside the shaft
(d) None of these
QUESTION.4. The shear stress varies from centre to the surface of the shaft with
(a) Uniform rate
(b) Varying rate
(c) Remains same
(d) None of these
QUESTION.5. The shaft are made of
(a) Mild steel
(b) alloy steel
(c) Cooper alloys
(d) Any of these
QUESTION.6.The shafts are designed on the basis of
(a) Rigidity
(b) Strength
(c) Both of these
(d) Either of these
QUESTION.7.The product of the tangential force acting on the shaft and radius of shaft known as
(a) Torsional rigidity
(b) Flexural rigidity
(c) Bending moment
(d) Twisting moment
QUESTION.8.The polar moment of inertia of a solid circular shaft of diameter (d) is
(a)
(b)
(c)
(d)
QUESTION.9.The polar moment of inertia of a hollow shaft of outer diameter (D) and inner diameter (d) is given by.
(a)
(b)
(c)
(d)
QUESTION.10. The torque transmitted by a solid shaft is
(a) 
(b) 
(c) 
(d) 
QUESTION.11. The torque transmitted by a hollow shaft of outer diameter (D) and inner diameter (d)
(a) 
(b) 
(c) 
(d) 
QUESTION.12. The criteria for the design of a shaft is the stress at
(a) The external surface
(b) The axis
(c) Any inside layer
(d) Any of these
QUESTION.13. The strength of a hollow shaft is ……… for the same length, material and weight of a solid shaft.
(a) More
(b) Less
(c) Equal
(d) None of these
QUESTION.14. For the same material, length and given torque, a hollow shaft weighs……………… a solid shaft.
(a) Less than
(b) More than
(c) Equal to
(d) None of these
Answers
1. (c) 2.(c) 3. (c) 4. (a) 5. (d) 6. (c) 7. (d)
8. (c) 9. (b) 10. (b) 11. (c) 12. (a) 13. (b) 14. (a)