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397.

In a biased differential relay, the bias is defined as a ratio of [1 mark]
(A) number of turns of restraining and operating coil
(B) operating coil current and restraining coil current
(C) fault current and operating coil current
(D) fault current and restraining coil current

asked in Electrical Engineering, 2006

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398.

Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching [1 mark]
(A) vacuum
(B) air blast
(C) SF₆
(D) Oil

asked in Electrical Engineering, 2006

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399.

The concept of an electrically short, medium, and long line is primarily based on the [1 mark]
(A) nominal voltage of the line
(B) physical length of the line
(C) wavelength of the line
(D) power transmitted over the line

asked in Electrical Engineering, 2006

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400.

In a DC machine, which of the following statements is true? [1 mark]
(A) Compensating winding is used for neutralizing armature reaction while interpole winding is used for producing residual flux
(B) Compensating winding is used for neutralizing armature reaction while interpole winding is used for improving commutation
(C) Compensating winding is used for improving commutation while interpole winding is used for neutralizing armature reaction
(D) Compensating winding is used for improving commutation while interpole winding is used for producing residual flux

asked in Electrical Engineering, 2006

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401.

For a single phase capacitor start induction motor which of the following statements is valid? [1 mark]
(A) The capacitor is used for power factor improvement
(B) The direction of rotation can be changed by reversing the main winding terminals
(C) The direction of rotation cannot be changed
(D) The direction of rotation can be changed by interchanging the supply terminals

asked in Electrical Engineering, 2006

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402.

In transformers, which of the following statements is valid? [1 mark]
(A) In an open circuit test, copper losses are obtained while in short circuit test, core losses are obtained
(B) In an open circuit test, current is drawn at high power factor
(C) In a short circuit test, current is drawn at zero power factor
(D) In an open circuit test, current is drawn at low power factor

asked in Electrical Engineering, 2006

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