Single phase induction motors

41. A shaded pole motor does not possess

centrifugal switch
capacitor
commutator
all of the above

Detailed SolutionA shaded pole motor does not possess

42. Locked rotor current of a shaded pole motor is

equal to full load current
less than full load current
slightly more than full load current
several times the full load current

Detailed SolutionLocked rotor current of a shaded pole motor is

43. The speed of a universal motor is generally reduced by using

gear trains
V-belts
brakes
chains

Detailed SolutionThe speed of a universal motor is generally reduced by using

44. Most of the fractional horsepower motors have either

hard and annealed bearings
ball or roller bearings
soft and porous bearings
plain or sleeve bearings

Detailed SolutionMost of the fractional horsepower motors have either

45. The speed/load characteristics of a universal motor is same as that of

D.C. motor
D.
motor B.
none of the above

Detailed SolutionThe speed/load characteristics of a universal motor is same as that of

46. If a single phase induction motor runs slower than normal, the most likely defect is

worn bearings
short-circuit in the winding
open-circuit in the winding
none of the above

Detailed SolutionIf a single phase induction motor runs slower than normal, the most likely defect is

47. In split phase motor main winding is of

thin wire placed at the top of the slots
thin wire placed at the bottom of the slots
thick wire placed at the bottom of the slots
thick wire placed at the top of the? slots

Detailed SolutionIn split phase motor main winding is of

48. A shaded pole motor can be used for

toys
hair dryers
circulators
any of the above

Detailed SolutionA shaded pole motor can be used for

49. The repulsion start induction run motor is used because of

good power factor
high efficiency
minimum cost
high starting torque

Detailed SolutionThe repulsion start induction run motor is used because of

50. Which of the following motors is used in a situation where load increases with speed ?

Induction motor
Three-phase series motor
Schrage motor
Hysteresis motor

Detailed SolutionWhich of the following motors is used in a situation where load increases with speed ?

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