In DC machine torque is proportional to which of the following

Electrical Engineering XYZ MCQs

In DC machine torque is proportional to which of the following:

1. Armature current(Ia)
2. Flux(φ)
3. Both of these
4. None of these

Correct answer: 3. Both of these

Explanation:

In a DC machine, the torque developed is proportional to both the armature current (Ia) and the flux (φ). The torque equation for a DC machine is given by:

ΦT=K⋅I_a​⋅Φ

where:

• T is the torque,
• K is a constant,
• I_a​ is the armature current,
• Φ is the flux.

This equation shows that the torque is directly proportional to both the armature current and the flux. Therefore, the correct answer is “Both of these.”