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619.

A 3-phase, 11-kV generator feeds power to a constant power unity power factor load of 100 MW through a 3-phase transmission line. The line-to-line voltage at the terminals of the machine is maintained constant at 11 kV. The per unit positive sequence impedance of the line based on 100 MVA and 11 kV is j0.2. The line-to-line voltage at the load terminals is measured to be less than 11 kV. The total reactive power to be injected at the terminals of the load to increase the line-to-line voltage at the load terminals to 11 kV is
[2 marks]
(a) 100 MVAR
(b) 10.1 MVAR
(c) -100 MVAR
(d) -10.1 MVAR

asked in Electrical Engineering, 2003

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620.

A dc distribution system is shown in Fig. with load currents as marked. The two ends of the feeder are fed by voltage sources such that V_P − V_Q = 3V. the value of the voltage V_P for a minimum voltage of 220 V at any point along the feeder is

[2 marks]
(a) 225. 89 V
(b) 222.89 V
(c) 220.0 V
(d) 228.58 V

asked in Electrical Engineering, 2003

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621.

A surge of 20 kV magnitude travels along a lossless cable towards its junction with two identical lossless overhead transmission lines. The inductance and the capacitance of the cable are 0.4 mH and 0.5 µF per km. The inductance and capacitance of the overhead transmission lines are 1.5 mH and 0.015 µF per km. The magnitude of the voltage at the junction due to surge is [2 marks]
(a) 36.72 kV
(b) 18.36 kV
(c) 6.07 kV
(d) 33.93 kV

asked in Electrical Engineering, 2003

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622.

The ABCD parameters of a 3-phase overhead transmission line are A = D =0.9∠0°, B = 200∠90°Ω and C = 0.95×10^-3 ∠90°S. At no-load condition a shunt inductive reactor is connected at the receiving end of the line to limit the receiving end voltage to be equal to the sending end voltage. The ohmic value of the reactor is [2 marks]
(a) ∞ Ω
(b) 2000 Ω
(c) 105.26 Ω
(d) 1052.6 Ω

asked in Electrical Engineering, 2003

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623.

A dc series motor driving an electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to [2 marks]
(a) 0.75 p.u.
(b) 0.5 p.u.
(c) 0.25 p.u.
(d) 0.125 p.u.

asked in Electrical Engineering, 2003

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624.

A single phase induction motor with only the main winding excited would exhibit the following response at synchronous speed [2 marks]
(a) Rotor current is zero
(b) Rotor current is non-zero and is at slip frequency
(c) Forward and backward rotating fields are equal
(d) Forward rotating field is more than the backward rotating field

asked in Electrical Engineering, 2003

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