In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be________?
A1500 r.p.m.
Bnone of the above
C3000 r.p.m.
D750 r.p.m.
Correct answer
A. 1500 r.p.m.
Explanation
The correct answer is 1500 r.p.m..