In case of DC machine, the torque depends on which of the below mentioned

In case of DC machine, the torque depends on which of the below mentioned:

1. Armature current (I)
2. Flux (φ)
3. Both 1 and 2
4. Speed

Correct answer: 3. Both 1 and 2

Explanation:

In a DC machine, the torque produced is given by the expression:

T = (k⋅Φ⋅I_a)/Z​​

where:

• T is the torque,
• k is a constant,
• Φ is the flux,
• I_a​ is the armature current,
• Z is the total number of armature conductors.

From the expression, it’s evident that both armature current (I_a​) and flux (Φ) play a role in determining the torque.

The correct answer is “Both 1 and 2” – torque depends on both armature current and flux in a DC machine.