A motor has a speed of 600 rpm, 4 pairs of poles and operates at a frequency of (a)   Hz.

A motor has a speed of (a)   rpm, 8 pairs of poles and operates at a frequency of 60 Hz.

A motor has a speed of 150 rpm, (a)   pairs of poles and operates at a frequency of 25 Hz.

A motor has a speed of 150 rpm, (a)   poles and operates at a frequency of 30Hz.

A motor has a speed of 750 rpm, 4 pairs of poles and operates at a frequency of (a)   Hz.

A motor has a speed of (a)   rpm, 12 poles and operates at a frequency of 60 Hz.

A motor has a speed of 3000 rpm, _ pairs of poles and operates at a frequency of 100 Hz.

(a)  

A motor has a speed of (a)   rpm, 8 pairs of poles and operates at a frequency of 80 Hz.

A motor has a speed of 2100 rpm, 1 pair of poles and operates at a frequency of (a)   Hz.

A motor has a speed of 600 rpm, 2 pairs of poles and operates at a frequency of (a)   Hz.

A motor has a speed of 1500 rpm, _ pairs of poles and operates at a frequency of 50 Hz.

(a)  

A motor has a speed of 450 rpm, 4 pairs of poles and operates at a frequency of (a)   Hz.

A motor has a speed of (a)   rpm, 6 poles and operates at a frequency of 40 Hz.

A motor has a speed of (a)   rpm, 4 pairs of poles and operates at a frequency of 60 Hz.

A motor has a speed of 750 rpm, _ pairs of poles and operates at a frequency of 100 Hz.

(a)  

A motor has a speed of 300 rpm, 10 pairs of poles and operates at a frequency of (a)   Hz.

A motor has a speed of 900 rpm, _ poles and operates at a frequency of 30 Hz.

(a)  

A motor has a speed of (a)   rpm, 1 pairs of poles and operates at a frequency of 40 Hz.

A motor has a speed of 750 rpm, 2 pairs of poles and operates at a frequency of (a)   Hz.