For P pole machine relation between electrical degrees and mechanical degrees is

Electrical Engineering XYZ MCQs

For P pole machine relation between electrical degrees and mechanical degrees is:

1. θ_elec = 4/P × θ_mech
2. θ_elec = 2/P × θ_mech
3. θ_elec = θ_mech
4. θ_elec = P/2*θ_mech

Correct answer: 4. θ_elec = P/2*θ_mech

Explanation: In a P-pole machine, the number of electrical cycles per revolution (360 degrees) is equal to the number of pole pairs (P/2). Therefore, the electrical angle (θ_elec) for a given mechanical angle (θ_mech) can be determined by multiplying the mechanical angle by the ratio of pole pairs to 2. Hence, the correct relation is:

θ_elec = P/2 × θ_mech

This equation establishes the relationship between the electrical and mechanical angles in a P-pole machine, allowing engineers to analyze and design electrical machinery accurately.