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313.

A Single phase full- wave half-controlled bridge converter feeds an inductive load. The two SCRs in the converter are connected to a common DC bus. The converter has to have a freewheeling diode
[1 mark]
(A) because the converter inherently does not provide for free-wheeling
(B) because the converter does not provide for free-wheeling for high values of triggering angles
(C) or else the free-wheeling action of the converter will cause shorting of the AC supply
(D) or else if a gate pulse to one of the SCRs is missed, it will subsequently cause a high load current in the other SCR

asked in Electrical Engineering, 2007

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314.

The probes of a non- isolated, two – channel oscilloscope are clipped to points A, B and C in the circuit of the adjacent figure. V_in is a square wave of a suitable low frequency. The display on Ch₁ and Ch₂ are as shown in the right. Then the ”Signal” and “Ground” probes S₁, G₁ and S₂, G₂ of Ch₁ and Ch₂ respectively are connected to points

[1 mark]
(A) A, B, C, A
(B) A, B, C, B
(C) C, B, A, B
(D) B, A, B, C

asked in Electrical Engineering, 2007

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315.

The dc motor, which can provide zero speed regulation at full load without any controller, is [1 mark]
(A) series
(B) shunt
(C) cumulative compound
(D) differential compound

asked in Electrical Engineering, 2007

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316.

In a transformer, zero voltage regulation at full load is [1 mark]
(A) not possible
(B) possible at unity power factor load
(C) possible at leading power factor load
(D) possible at lagging power factor load

asked in Electrical Engineering, 2007

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317.

A three – phase , fully controlled thyristor bridge converter is used as line commutated inverter to feed 50 kW power at 420 V dc to a three – phase, 415 V (line) , 50 Hz ac mains. Consider dc link current to be constant. The rms current of the thyristor is [1 mark]
(A) 119.05 A
(B) 79.37 A
(C) 68.73 A
(D) 39.68A

asked in Electrical Engineering, 2007

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318.

A single – phase fully controlled thyristor bridge ac – dc converter is operating at a firing angle of 20° and an overlap angle 10° with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is [1 mark]
(A) 0.78
(B) 0.827
(C) 0.866
(D) 0.9

asked in Electrical Engineering, 2007

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