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Q5) Answer the following ( 1. An SCR is considered to be a semi-controlled device because a. It can be turned OFF but not ON with a gate pulse. b. It conducts only during one half-cycle of an alternating current wave. c. It can be turned ON but not OFF with a gate pulse. d. It can be turned ON only during one half-cycle of an alternating voltage wave. 2. A thyristor half wave controlled converter has a supply voltage of 240V at 50Hz and a load re- of 100 Ohm. when the firing delay angle is 30 the average value of load current is d. 24 A a. 126A b. 2.4A c. 126mA e. None of the above 3. In forward blocking mode of a thyristor a. junction J2 is in reverse bias and J1, J3 is in forward bias. b. junction J3 is in forward bias and J1, J2 is in reverse bias. c. Junction J1, J3 is in reverse bias and J2 is in forward bias. d. Junction J1 and J2 is in forward bias and J3 is in reverse bias. 4. In a full wave rectifier, the rectification efficiency is approximately equal to b. 71% a. 61% c. 81% d. 91% e. None of the above

Q5) Answer the following ( 1. An SCR is considered to be a semi-controlled device because a. It can be turned OFF but not ON with a gate pulse. b. It conducts only during one half-cycle of an alternating current wave. c. It can be turned ON but not OFF with a gate pulse. d. It can be turned ON only during one half-cycle of an alternating voltage wave. 2. A thyristor half wave controlled converter has a supply voltage of 240V at 50Hz and a load re- of 100 Ohm. when the firing delay angle is 30 the average value of load current is d. 24 A a. 126A b. 2.4A c. 126mA e. None of the above 3. In forward blocking mode of a thyristor a. junction J2 is in reverse bias and J1, J3 is in forward bias. b. junction J3 is in forward bias and J1, J2 is in reverse bias. c. Junction J1, J3 is in reverse bias and J2 is in forward bias. d. Junction J1 and J2 is in forward bias and J3 is in reverse bias. 4. In a full wave rectifier, the rectification efficiency is approximately equal to b. 71% a. 61% c. 81% d. 91% e. None of the above

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Q5) Answer the following ( 1. An SCR is considered to be a semi-controlled device because a. It can be turned OFF but not ON with a gate pulse. b. It conducts only during one half-cycle of an alternating current wave. c. It can be turned ON but not OFF with a gate pulse. d. It can be turned ON only during one half-cycle of an alternating voltage wave. 2. A thyristor half wave controlled converter has a supply voltage of 240V at 50Hz and a load resistance of 100 Ohm. when the firing delay angle is 30 the average value of load current is b. 2.4A d. 24 A c. 126mA a. 126A e. None of the above 3. In forward blocking mode of a thyristor a. junction J2 is in reverse bias and J1, J3 is in forward bias. b. junction J3 is in forward bias and J1, J2 is in reverse bias. c. Junction J1, J3 is in reverse bias and J2 is in forward bias. d. Junction J1 and J2 is in forward bias and J3 is in reverse bias. 4. In a full wave rectifier, the rectification efficiency is approximately equal to a. 61% b. 71% c. 81% d. 91% 5 a 3 phase bridge rectifier the ripple frequency is a. Equal to the input frequency b. Twice the input frequency e. None of the above c. Three times the input frequency d. Six times the input frequency 6. In a single phase full wave center tap rectifier, during blocking state the peak inverse voltage of diode is a. Vm b. 2 Vm c. Vm/2 d. 4 Vm e. None of the above 7. The effect of source inductance on the performance of a 3-phase controlled converter is to a) increase the average load voltage b) reduce the average load voltage c) make the load current continuous d) remove ripples from the load current and da
Transcribed Image Text:Q5) Answer the following ( 1. An SCR is considered to be a semi-controlled device because a. It can be turned OFF but not ON with a gate pulse. b. It conducts only during one half-cycle of an alternating current wave. c. It can be turned ON but not OFF with a gate pulse. d. It can be turned ON only during one half-cycle of an alternating voltage wave. 2. A thyristor half wave controlled converter has a supply voltage of 240V at 50Hz and a load resistance of 100 Ohm. when the firing delay angle is 30 the average value of load current is b. 2.4A d. 24 A c. 126mA a. 126A e. None of the above 3. In forward blocking mode of a thyristor a. junction J2 is in reverse bias and J1, J3 is in forward bias. b. junction J3 is in forward bias and J1, J2 is in reverse bias. c. Junction J1, J3 is in reverse bias and J2 is in forward bias. d. Junction J1 and J2 is in forward bias and J3 is in reverse bias. 4. In a full wave rectifier, the rectification efficiency is approximately equal to a. 61% b. 71% c. 81% d. 91% 5 a 3 phase bridge rectifier the ripple frequency is a. Equal to the input frequency b. Twice the input frequency e. None of the above c. Three times the input frequency d. Six times the input frequency 6. In a single phase full wave center tap rectifier, during blocking state the peak inverse voltage of diode is a. Vm b. 2 Vm c. Vm/2 d. 4 Vm e. None of the above 7. The effect of source inductance on the performance of a 3-phase controlled converter is to a) increase the average load voltage b) reduce the average load voltage c) make the load current continuous d) remove ripples from the load current and da
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