Question

When the shaft is transmitting torque, which of the following phenomenon occurs?

(a) Visible Flashing of light

(b) Flashing of light cannot be seen

(c) Angle of torsion cannot be measured

(d) Torsion meter stops working

This question was addressed to me in class test.

Asked question is from Bevis Gibson Flash Light Torsion Dynamometer in portion Brakes and Dynamometers of Machine Dynamics

Answer 1

Correct answer is (b) Flashing of light cannot be seen

The explanation is: When the shaft is transmitting torque, the position of slit does change relative to one another, as a result flashing of light cannot be seen. This phenomenon occurs only because the relative position of slits is changing.