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523.

A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the number of poles required in the generator are [2 marks]
(a) 6
(b) 12
(c) 16
(d) 24

asked in Electrical Engineering, 2004

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524.

A 50 Hz, 4-pole, 500 MVA, 22 kV turbo-generator is delivering rated megavoltamperes at 0.8 power factor. Suddenly a fault occurs reducing is electric power output by 40%. Neglect losses and assume constant power input to the shaft. The accelerating torque in the generator in MNm at the time of the fault will be [2 marks]
(a) 1.528
(b) 1.018
(c) 0.848
(d) 0.509

asked in Electrical Engineering, 2004

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525.

A 500 MVA, 50 Hz, 3-phase turbo-generator produces power at 22 kV. Generator is Y-connected and its neutral is solidly grounded. Their sequence reactances are X₁ = X₂ = 0.15 and X₀ = 0.05pu. it is operating at rated voltage and disconnected from the rest of the system (no load). The magnitude of the sub-transient lien current for single line ground fault at the generator terminal in pu will be [2 marks]
(a) 2.851
(b) 3.333
(c) 6.667
(d) 8.553

asked in Electrical Engineering, 2004

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526.

A 3-phase transmission line supplies Δ-connected load Z. The conductor ‘c’ of the line develops an open circuit fault as shown in figure. The currents in the lines are as shown on the diagram. The positive sequence current component in line ‘a’ will be

[2 marks]
(a) 5.78 ∠-30°
(b) 5.78 ∠90°
(c) 6.33 ∠90°
(d) 10.00 ∠-30°

asked in Electrical Engineering, 2004

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527.

A 3-phase generator rated at 110MVA, 11 kV is connected through circuit
breakers to a transformer. The generator is having direct axis sub-transient reactance X"_d =19% , transient reactance X'_d =26% and synchronous reactance =130%. The generator is operating at no load and rated voltage when a threephase short circuit fault occurs between the breakers and the transformer. The magnitude of initial symmetrical rims current in the breakers will be [2 marks]
(a) 4.44 kA
(b) 22.20 kA
(c) 30.39 kA
(d) 38.45 kA

asked in Electrical Engineering, 2004

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528.

A new generator having E_g = 1.4∠30° pu [equivalent to (1.212+j0.70)pu] and synchronous reactance ‘X_s’ of 1.0 pu on the system base, is to be connected to a bus having voltage V_t in the existing power system. This existing power system can be represented by Thevenin’s voltage Eth =0.9∠0° pu in series with Thevenin’s impedance Z_th = 0.25∠90° pu. The magnitude of the bus voltage V_t of the system in pu will be
[2 marks]
(a) 0.990
(b) 0.973
(c) 0.963
(d) 0.900

asked in Electrical Engineering, 2004

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