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781.

In the protection of transformers, harmonic restraint is used to guard against
[1 mark]
(a) magnetizing inrush current
(b) unbalanced operation
(c) lightning
(d) switching over-voltages

asked in Electrical Engineering, 2001

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782.

A 50 Hz balanced three-phase, Y-connected supply is connected to a balanced three phase Y-connected load. If the instantaneous phase-α of the supply voltage is Vcos(ωt) and the phase-α of the load current is Icos(ωt-φ), the instantaneous three-phase power is [1 mark]
(a) a constant with a magnitude of VIcosφ.
(b) a constant with a magnitude of (3/2)VIcosφ.
(c) time-varying with an average value of (3/2) VIcosφ and a frequency of 100 Hz.
(d) time-varying with an average value of VIcosφ and a frequency of 50 Hz.

asked in Electrical Engineering, 2001

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783.

X_d, X'_d and X''_d are steady state d-axis synchronous reactance, transient d-axis reactance and sub-transient d-axis reactance of a synchronous machine respectively. Which of the following statements is true?
[1 mark]
(a) X_d> X'_d > X''_d
(b) X"_d> X'_d > X_d(c) X_'d> X''_d > X_d(d) X_d> X"_d > X'_d

asked in Electrical Engineering, 2001

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784.

The core flux of a practical transformer with a resistive load
[1 mark]
(a) is strictly constant with load changes
(b) increases linearly with load
(c) increases as the square root of the load
(d) decreases with increased load

asked in Electrical Engineering, 2001

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785.

Figure shows the magnetization curves of an alternator at rated armature current, unity power factor and also at no load. The magnetization curve for rated armature current, 0.8 power factor leading is given by

[1 mark]
(a) curve A
(b) curve B
(c) curve C
(d) curve D

asked in Electrical Engineering, 2001

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786.

It is desirable to eliminate 5^th harmonic voltage from the phase voltage of an alternator. The coils should be short-pitched by an electrical angle of
[1 mark]
(a) 30°
(b) 36°
(c) 72°
(d) 18°

asked in Electrical Engineering, 2001

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