1
GATE ME 2016 Set 1
MCQ (Single Correct Answer)
+1
-0.3
The cross sections of two hollow bars made of the same material are concentric circles as shown in the figure. It is given that 𝑟3 > 𝑟1 and 𝑟4 > 𝑟2 , and that the areas of the cross-sections are the same. J1 and J2 are the torsional rigidities of the bars on the left and right, respectively. The ratioJ2/J1 is
A
> 1
B
< 0.5
C
$$=$$ 1
D
between 0.5 and 1
2
GATE ME 2015 Set 2
Numerical
+1
-0
A rope brake dynamometer attached to the crank shaft of an $$I.C.$$ engine measures a brake power of $$10$$ kW when the speed of rotation of the shaft is $$400$$ rad/s. The shaft torque (in N-m) sensed by the dynamometer is ________
3
GATE ME 2015 Set 1
Numerical
+1
-0
Consider a stepped shaft subjected to a twisting moment applied at $$B$$ as shown in the figure. Assume shear modulus, $$G=77$$ GPa. The angle of twist at $$C$$ (in degrees) is ________
4
GATE ME 2014 Set 3
Numerical
+1
-0
Two solid circular shafts of $${{R_1}}$$ and $${{R_2}}$$ are subjected to same torque. The maximum shear stresses developed in the two shafts are $${\tau _1}$$ and $${\tau _2}.$$ If $${{{R_1}} \over {{R_2}}} = 2,$$ then $${{{\tau _1}} \over {{\tau _2}}}$$ is _______.