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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
5. An AC Servo Motor is basically a
(a) hysteresis motor
(b) synchronous motor
(c) DC shunt motor
(d) 2-phase induction motor [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
6. Which of the following special motor has no winding?
(a) repulsion motor
(b) stepper motor
(c) hysteresis motor
(d) reluctance motor [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
8. In AC series motors, armature coils are usually connected to commutator through
(a) inductor
(b) resistor
(c) capacitor
(d) none of the above [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
10. The electric motor generally used in computer printer driver is
(a) reluctance motor
(b) hysteresis motor
(c) universal motor
(d) stepper motor [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
13. An infinite busbar has
(a) constant voltage
(b) constant frequency
(c) same phase sequence
(d) all of the above [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
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 [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
15. If the supply frequency of universal motor increases, its speed is
(a) increase
(b) decrease
(c) remain unchanged
(d) none of the above [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]