Electrical Engineering MCQs

A shunt generator can self-excite:_________________?

A. Only if the resistance of the field circuit is less than critical value
B. Only if the resistance of the field circuit is greater than critical value
C. Irrespective of the value of the resistance in the field circuit
D. None

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The critical resistance of the D.C. generator is the resistance of_____________?

A. Field
B. Brushes
C. Armature
D. Load

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When two D.C. series generators are running in parallel, an equilizer bar is used________________?

A. To increase the speed and hence generated e.m.f.
B. To increase the series flux
C. So that two similar machines will pass approximately equal currents to the load
D. To reduce the combined effect of ar-mature reaction of both machines

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Which of the following generating machine will offer constant voltage on all loads?

A. Self-excited generator
B. Separately excited generator
C. Level compounded generator
D. All of the above

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In a D.C. generator:___________________?

A. External resistance = internal char-acteristic – armature reaction
B. Internal characteristic = magnetisation characteristic – ohmic drop
C. External characteristic = magnetisation characteristic – ohmic drop – armature reaction
D. Magnetisation characteristic = external characteristic

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Wave winding is composed of_______________?

A. Any even number of conductors
B. Any odd number of conductors
C. That even number which is exact multiple of poles + 2
D. That even number which is exact multiple of poles

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In a separately excited generator supplying rated load the armature reaction.

A. Is always present
B. Is always absent
C. May be sometimes present
D. None of the above

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If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________?

A. Zero
B. Small
C. The same as rated voltage
D. High

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Armature reaction in a generator results in_____________?

A. Demagnetisation of leading pole tip and magnetisation of trailing pole tip
B. Demagnetisation of trailing pole tip and magnetisation of leading pole tip
C. Damagnetising the center of all poles
D. Magnetising the center of all poles

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Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.

A. Series field
B. Compensating field
C. Inter pole field
D. Shunt field

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