Question:-
The crank of a slider-crank punching press has a mass moment of inertia of 1 kgm2. The above figure shows the torque demand per revolution for a punching operation. If the speed of the crank is found to drop from 30 rad/s to 20 rad/s during punching what is the maximum torque demand during the punching operation?

Option (A)
95.4 Nm
Option (B)
104.7 Nm
Option(C)
477.2 Nm
Option(D)
523.8 Nm
Correct Option:
(C)
Question Solution:
ΔE = (1/2) x 1 (w22 - w21)
= (1/2) x 1 x (302 - 202)
= 250 Nm
\ (1/2) x T x (p/3) = 250
\ T = 477.2 Nm
question-answer-faq-6350