1. In a repulsion motor, direction of rotation can be changed by a changing the
(a) supply terminals
(b) supply frequency
(c) position of brush
(d) supply voltage Answer
2. The few field turns are used in AC series motor in orders to reduce
(a) hysteresis loss
(b) eddy current losses
(c) starting current
(d) reluctance Answer
3. In a repulsion start induction motor, the short circuiting device is operated by
(a) Lorentz force
(b) centrifugal force
(c) mutual induction
(d) self induction Answer
4. In a shaded pole motor the direction of rotation is always from
(a) shaded pole to unshaded pole
(b) unscheduled pole to shaded pole
(c) in anticlockwise
(d) in clockwise Answer
5. An AC Servo Motor is basically a
(a) hysteresis motor
(b) synchronous motor
(c) DC shunt motor
(d) 2-phase induction motor Answer
6. Which of the following special motor has no winding?
(a) repulsion motor
(b) stepper motor
(c) hysteresis motor
(d) reluctance motor Answer
7. Which of the following motor always as a permanent magnet?
(a) Universal motor
(b) Stepper motor
(c) Reluctance motor
(d) None of the above Answer
8. In AC series motors, armature coils are usually connected to commutator through
(a) inductor
(b) resistor
(c) capacitor
(d) none of the above Answer
9. In hysteresis motors, the rotor is made of magnetic material having area of hysteresis loop
(a) negligible
(b) very small
(c) medium
(d) large Answer
10. The electric motor generally used in computer printer driver is
(a) reluctance motor
(b) hysteresis motor
(c) universal motor
(d) stepper motor Answer
11. Which of the following motor produce uniform torque at torque at all speed?
(a) stepper motor
(b) universal motor
(c) reluctance motor
(d) hysteresis motor Answer
12. Which of the following single phase induction motor has the highest power factor at full load?
(a) Split phase
(b) Shaded pole
(c) Capacitor-start
(d) Capacitor-run Answer
13. An infinite busbar has
(a) constant voltage
(b) constant frequency
(c) same phase sequence
(d) all of the above Answer
14. In a shaded pole motor, the rotating field is developed by using
(a) split phase
(b) shading coil
(c) inter-pole capacitor
(d) a capacitor Answer
15. If the supply frequency of universal motor increases, its speed is
(a) increase
(b) decrease
(c) remain unchanged
(d) none of the above Answer