Universal Motor Multiple Choice Questions and Answers
6. The speed/load characteristics of a universal motor is same as that of
A.A.C. motor
B.D.C. shunt motor
C.D.C. series motor
D.None of the above
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C.D.C. series motor
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7. In a universal motor, the most common cause of brush sparking is
A.Open armature winding
B.Shorted armature winding
C.Shorted field winding
D.High commutator mica
E.All of the above
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8. A universal motor is one which
A.Can be operated either on D.C. or A.C. supply at approximately the same speed and output
B.Can be marketed internationally
C.Runs at dangerously high speed on no-load
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9. Speed control of a universal motor is achieved by
A.Varying field flux with tapped field windings
B.Connecting rheostat in series
C.Applying variable voltage by means of silicon controlled rectifier
D.Applying variable voltage by means of variable auto-transformer
E.All of the above methods
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10. The speed of a universal motor is usually reduced by using
A.Gearing
B.Belts
C.Brakes
D.Chains
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