Question

A rope-brake dynamometer attached to the crank shaft of an I.C. engine measures a brake power of 10kW when the speed of rotation of the shaft is 400 rad/s. The shaft torque (in N-m) sensed by the dynamometer is _______

Answer 1

Brake power developed by the engine is given by 

Brake Power = Torque × angular velocity

B.P = T× ω =2πNT/60

Given, B.P = 10 kW =10000 W and ω = 400 rad/s

from  B.P = T× ω

10000 = T × 400

\(T = \frac{{10000}}{{400}} = 25N - m\)