Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter S, Problem 12RQ
What is the approximate current at which a ground-fault detector will open the circuit?
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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%…
10. A series circuit consisting of a 30 – microfarad and a 0.155 – henry inductor isconnected to a 120 – volt 60 – cycle source. Calculate the circuit current andindicate whether it lags behind or leads the voltage.
What Transient Voltage appears across the Circuit Breaker contacts at, or near Current
Zero during the Arcing Period?
O A. Arc Voltage
O B. Recovery Voltage
O C. Restriking Voltage
O D. Critical Disruptive Voltage
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Chapter S Solutions
Delmar's Standard Textbook Of Electricity
Ch. S - What is the most important rule of electrical...Ch. S - Prob. 2RQCh. S - What range of electric current generally causes...Ch. S - What is fibrillation of the heart?Ch. S - Prob. 5RQCh. S - Who is responsible for enforcing OSHA regulations?Ch. S - Prob. 7RQCh. S - What is an MSDS?Ch. S - A padlock is used to lock out a piece of...Ch. S - A ladder is used to reach the top of a building 16...
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