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337.

A 4 pole, 50 Hz, synchronous generator has 48 slots in which a double layer winding is housed. Each coil has 10 turns and is short pitched by an angle to 36⁰ electrical. The fundamental flux per pole is 0.025 Wb.

[1] The line – to – line induced emf (in volts), for a three phase star connection is approximately [2 marks]
(A) 808
(B) 888
(C) 1400
(D) 1538
[2] The line-to-line induced emf (in volts), for a three phase connection is approximately [2 marks]
(A) 1143
(B) 1332
(C) 1617
(D) 1791
[3] The fifth harmonic component of phase emf (in volts), for a three phase star connection is [2 marks]
(A) 0
(B) 269
(C) 281
(D) 808

asked in Electrical Engineering, 2006

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338.

An SCR having a turn ON time of 5µsec, latching current of 50 mA and holding current of 40 mA is triggered by a short duration pulse and is used in the circuit shown in figure. The minimum pulse width required to turn the SCR ON will be

[2 marks]
(A) 251μsec
(B) 150μsec
(C) 100μsec
(D) 5μsec

asked in Electrical Engineering, 2006

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339.

A single – phase bridge converter is used to charge a battery of 200 V having an internal resistance of 0.2 Ω as shown in figure. The SCRs are triggered by a constant dc signal. If SCR 2 gets open circuited, then what will be the average charging current?

[2 marks]
(A) 23.8 A
(B) 15 A
(C) 11.9 A
(D) 3.54 A

asked in Electrical Engineering, 2006

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340.

A solar cell of 350 V is feeding power to an ac supply of 440 V, 50 Hz through a 3 – phase fully controlled bridge converter. A large inductance is connected in the dc circuit to maintain the dc current at 20 A. If the solar cell resistance is 0.5 Ω, then each thyristor will be reverse biased for a period of
[2 marks]
(A) 125°
(B) 120°
(C) 60°
(D) 55°

asked in Electrical Engineering, 2006

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341.

A voltage commutation circuit is shown in figure. If the turn off time of the SCRs is 50µsec and a safety margin of 2 is considered, then what will be the approximate minimum value of capacitor required for proper commutation?

[2 marks]
(A) 2.88 µF
(B) 1.44 µF
(C) 0.91 µF
(D) 0.72 µF

asked in Electrical Engineering, 2006

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342.

A 3- phase fully controlled bridge converter with free wheeling diode is fed from 400 V, 50 Hz AC source and is operating at a firing angle of 60°. The load current is assumed constant at 10 A due to high load inductance. The input displacement factor (IDF) and the input power factor (IPF) of the converter will be [2 marks]
(A) IDF = 0.867, IPF = 0.828
(B) IDF= 0.867, IPF = 0.552
(C) IDF = 0.5, IPF = 0.478
(D) IDF = 0.5, IPF = 0.318

asked in Electrical Engineering, 2006

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