71800598 multiple choice questions

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MULTIPLE CHOICE QUESTIONS (MCQS) Chapter 2: Thyristor: Principles and Characteristics 2.1 Which of the following conditions is necessary for triggering system for thyristors? (a) It should be synchronised with the main supply (b) It must use separate power supply (c) It should provide a train of pulses (d) None of these 2.2 For thyristors, pulse triggering is preferred to dc triggering because (a) gate dissipation is low (b) pulse system is simpler (c) triggering system is required for a very short duration (d) all of these 2.3 The SCR is turned-off when the anode current falls below (a) forward current rating (b) breakover voltage (c) holding current (d) latching current 2.4 In a SCR circuit, the angle of conduction can be changed by changing (a) anode voltage (b) anode current (c) forward current rating (d) gate current 2.5 The normal way to close a SCR is by approximate (a) gate current (b) cathode current (c) anode current (d) forward current 2.6 If gate current is increased, the anode-cathode voltage at which SCR closes is (a) increased (b) decreased (c) maximum (d) least 2.7 A conducting SCR can be opened by reducing __________ to zero. (a) supply voltage (b) gate voltage (c) gate current (d) anode current 2.8 With gate open, a SCR can be turned-on by making supply voltage (a) minimum (b) reverse (c) equal to cathode voltage (d) equal to break-over voltage 2.9 A SCR is a _________ switch. (a) two directional (b) unidirectional (c) three-directional (d) four-directional 2.10 The turn-off time of thyristor is 30 m sec at 50°C. Its turn-off time at 100° is (a) same (b) 15 m sec (c) 60 m sec (d) 100 m sec 2.11 Turn-off time of a thyristor effects its (a) operating voltage (b) operating frequency (c) overload capacity (d) thermal behaviour 2.12 The di/dt capability of a thyristor increases (a) when the gate current is zero (b) when the gate current increases (c) when the gate current decreases (d) when the anode to cathode voltage rating increases.

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Multiple choice Questions.p65 9/27/07, 2:08 PM159

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Multiple choice Questions.p65 9/27/07, 2:08 PM163

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Multiple choice Questions.p65 9/27/07, 2:08 PM164

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Multiple choice Questions.p65 9/27/07, 2:08 PM166

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Chapter 10: Cycloconverters

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Chapter 11: A.C. Regulators

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