**
In the torsion equation, $\frac{T}{J}=\frac{\tau}{R}=\frac{C.\theta}{l}$ the term J/R is called**

**(A)**shear modulus

**(B)**section modulus

**(C)**polar modulus

**(D)**none of these

**C**

**
When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal**

**(A)**polar moment of inertia

**(B)**polar modulus

**(C)**diameter

**(D)**angle of twist

**B**

**
Torque transmitted by a solid shaft of diameter (d), when subjected to shear stress (𝞽) is equal to**

**(A)**$\frac{\pi}{16}\times \tau \times {d}^{2}$

**(B)**$\frac{\pi}{16}\times \tau \times {d}^{3}$

**(C)**$\frac{\pi}{32}\times \tau \times {d}^{2}$

**(D)**$\frac{\pi}{32}\times \tau \times {d}^{3}$

**B**

**
Polar moment of inertia of a solid shaft of diameter (d) is**

**(A)**$\frac{\pi}{16}{d}^{3}$

**(B)**$\frac{\pi}{16}{d}^{4}$

**(C)**$\frac{\pi}{32}{d}^{3}$

**(D)**$\frac{\pi}{32}{d}^{4}$

**D**

**
When a machine member is subjected to torsion, the torsional shear stress set up in the member is**

**(A)**zero at both the centroidal axis and outer surface of the member

**(B)**maximum at both the centroidal axis and outer surface of the member

**(C)**zero at the centroidal axis and maximum at the outer surface of the member

**(D)**maximum at the centroidal axis and zero at the outer surface of the member

**C**