A. is opposite to that of brush shift
B. is the same as that of brush shift
C. is independent of brush shift
A. smaller brush width
B. less number of field turns
C. more number of armature turns
D. less air gap
E. all of the above
A. improves the efficiency
B. helps the rotor teeth to remain under the stator teeth
C. helps in reducing the tendency of the rotor teeth to remain under the stator teeth
D. improves the power factor
A. Capacitor start motor
B. Capacitor run motor
C. Split phase motor
D. Shaded pole motor
A. toys
B. hair dryers
C. circulators
D. any of the above
A. run for about 1 minute
B. run for about 5 minutes
C. picked up about 50 to 70 per cent of rated speed
D. picked up about 10 to 25 per cent of rated speed
A. brush axis is 45° electrical to field axis
B. brush axis coincides with the field axis
C. brush axis is 90° electrical to field axis
D. both B. and (c)