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757.

A 50 Hz alternator is rated 500 MVA, 20 kV, with X_d = 1.0 per unit and X"_d = 0.2per unit. It supplies a purely resistive load of 400 MW at 20 kV. The load is connected directly across the generator terminals when a symmetrical fault occurs at the load terminals. The initial rms current in the generator in per unit is [2 marks]
(a) 7.22
(b) 6.4
(c) 3.22
(d) 2.2

asked in Electrical Engineering, 2001

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758.

A 240 V single-phase ac source is connected to a load with an impedance of 10∠60°Ω. A capacitor is connected in parallel with the load. If the capacitor supplies 1250 VAR, the real power supplied by the source is
[2 marks]
(a) 3600 W
(b) 2880 W
(c) 2400 W
(d) 1200 W

asked in Electrical Engineering, 2001

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759.

A star-connected 440 V, 50 Hz alternators has per phase synchronous reactance of 10Ω. It supplies a balanced capacitive load current of 20 A, as shown in the per phase equivalent circuit of Fig. It is desirable to have zero voltage regulation. The load power factor should be

[2 marks]
(a) 0.82
(b) 0.47
(c) 0.39
(d) 0.92

asked in Electrical Engineering, 2001

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760.

A 75 NVA, 10 kV synchronous generator has X_d = 0.4 p.u. The X_d value (in p.u.) is a base of 100 MVA, 11 kV is [2 marks]
(a) 0.578
(b) 0.279
(c) 0.412
(d) 0.44

asked in Electrical Engineering, 2001

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761.

A 3-phase transformer has rating of 20 MVA, 220 kV (star) – 33 kV (delta) with leakage reactance of 12%. The transformer reactance (in ohms) referred to each phase of the L.V. delta-connected side is
[2 marks]
(a) 23.5
(b) 19.6
(c) 18.5
(d) 8.7

asked in Electrical Engineering, 2001

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762.

An electric motor with ‘constant output power’ will have a torque speed characteristic in the form of a [2 marks]
(a) straight line through the origin
(b) straight line parallel to the speed axis
(c) circle about the origin
(d) rectangular hyperbola

asked in Electrical Engineering, 2001

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