Which of the following motors can be run on AC. as well as D.C. supply ?
(A) Universal motor
(B) Repulsion motor
(C) Synchronous motor
(D) Reluctance motor
The starting winding of a single-phase motor is placed in_________?
(A) armature
(B) field
(C) rotor
(D) stator
The speed of a universal motor is usually reduced by using____________?
(A) gearing
(B) belts
(C) brakes
(D) chains
Which motor is normally free from mechanical and magnetic vibrations ?
(A) Split phase motor
(B) Universal motor
(C) Hysteresis motor
(D) Shaded pole motor
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________?
(A) fans
(B) blowers
(C) sound equipment
(D) mixer grinders
The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?
(A) armature winding
(B) field winding
(C) either armature winding or field winding
(D) none of the above
When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?
(A) high inductance of field and armature circuits
(B) induced current in rotor due to variations of flux
(C) fine copper wire winding
(D) none of the above
In which single-phase motor, the rotor has no teeth or winding ?
(A) Split phase motor
(B) Reluctance motor
(C) Hysteresis motor
(D) Universal motor
The speed of a universal motor is generally reduced by using_________?
(A) gear trains
(B) V-belts
(C) brakes
(D) chains
Which of the following single-phase motors has relatively poor starting torque ?
(A) Universal motor
(B) Repulsion motor
(C) Capacitor motor
(D) All single phase motors have zero starting torque