Question

What type of force handles for active torques?

(a) Strong nuclear forces

(b) Weak nuclear forces

(c) Gravitational forces

(d) Electrostatic forces

The question was posed to me in a national level competition.

This intriguing question comes from Dynamics topic in section Dynamics of Electrical Drives of Electric Drives

Answer 1

The correct choice is (c) Gravitational forces

The explanation: Gravitational forces are responsible for active torques. Active torques due to gravitational forces can be obtained in the case of hoists, lifts or elevators and railway locomotives operating on gradients.