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553.

The circuit in figure shows a 3-phase half-wave rectifier. The source is a symmetrical, 3-phase four-wire system. The line-to-line voltage of the source is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is

[1 mark]
(a) 400 Hz
(b) 800 Hz
(c) 1200 Hz
(d) 2400 Hz

asked in Electrical Engineering, 2004

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554.

The triggering circuit of a thyristor is shown in figure. The thyristor requires a gate current of 10 mA, for guaranteed turn-on. The value of R required for the thyristor to turn on reliably under all conditions of Vb variation is

[1 mark]
(a) 10000Ω
(b) 1600Ω
(c) 1200Ω
(d) 800Ω

asked in Electrical Engineering, 2004

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555.

The circuit in figure shows a full-wave rectifier. The input voltage is 230V (rms) single-phase ac. The peak reverse voltage across the diodes D1 and D2 is

[1 mark]
(a) 100 √2 V
(b) 100 V
(c) 50 √2 V
(d) 50 V

asked in Electrical Engineering, 2004

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556.

A bipolar junction transistor (BJT) is used as a power control switch by biasing it in the cut-off region (OFF state) or in the saturation region (ON state). In the ON state, for the BJT [1 mark]
(a) both the base-emitter and base-collector junctions are reverse biased
(b) the base-emitter junctions is reverse biased, and the base-collector junction is forward biased
(c) the base-emitter junction is forward biased, and the base-collector junction is reverse biased
(d) both the base-emitter and base-collector junctions are forward biased

asked in Electrical Engineering, 2004

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557.

A galvanometer with a full-scale current of 10mA has a resistance of 1000Ω. The multiplying power (the ratio of measured current to galvanometer current) of a 100Ω shunt with this galvanometer is [1 mark]
(a) 110
(b) 100
(c) 11
(d) 10

asked in Electrical Engineering, 2004

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558.

The circuit in figure is used to measure the power consumed by the load. The current coil and the voltage coil of the wattmeter have 0.02Ω and 1000Ω resistances respectively. The measured power compared to the load power will be

[1 mark]
(a) 0.4% less
(b) 0.2% less
(c) 0.2% more
(d) 0.4% more

asked in Electrical Engineering, 2004

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