EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 1, Problem 16R
To determine
Choose the option that dictates the requirements for work related safety issues.
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With the aid of a phasor diagram show that the active
power and power factor of a balanced three-phase load
can be measured by two wattmeters.
For a certain load, one wattmeter indicated 20 kW
and the other 5 kW after the voltage circuit of this
wattmeter had been reversed. Calculate the active
power and the power factor of the load.
ANS:
15 kW, 0.327
State the advantages to be gained by raising the power
factor of industrial loads.
A 400 V, 50 Hz, three-phase motor takes a line
current of 15.0 A when operating at a lagging power
factor of 0.65. When a capacitor bank is connected
across the motor terminals, the line current is reduced
to 11.5 A. Calculate the rating (in kVA) and the capa
citance per phase of the capacitor bank for: (a) star
connection; (b) delta connection. Find also the new
overall power factor.
ANS:
3.81 kvar, 70.5 µF, 23.5 µF, 0.848 lagging
A single wattmeter is used to measure the total active
power taken by a 400 V, three-phase induction motor.
When the output power of the motor is 15 kW, the
efficiency is 88 per cent and the power factor is 0.84
lagging. The current coil of the wattmeter is connected
in the yellow line. With the aid of a phasor diagram,
calculate the wattmeter indication when the voltage
circuit is connected between the yellow line and (a) the
red line, (b) the blue line. Show that the sum of the two
wattmeter indications gives the total active power taken
by the motor. Assume the phase sequence to be R–Y–B.
ANS: 11.7 kW, 5.33 kW
Chapter 1 Solutions
EBK ELECTRICAL WIRING RESIDENTIAL
Ch. 1 - Prob. 1RCh. 1 - Prob. 2RCh. 1 - Does the NEC provide minimum or maximum standards?...Ch. 1 - What do the letters UL signify?Ch. 1 - What section of the NEC states that all listed or...Ch. 1 - Prob. 6RCh. 1 - Prob. 7RCh. 1 - Does compliance with the NEC always result in an...Ch. 1 - Name two nationally recognized testing...Ch. 1 - Prob. 10R
Ch. 1 - Prob. 12RCh. 1 - A junction box on a piece of European equipment is...Ch. 1 - Prob. 14RCh. 1 - You will learn in Chapter 3 that residential...Ch. 1 - Prob. 16RCh. 1 - What can you do to reduce or eliminate the...Ch. 1 - What is the NEC definition of a qualified person?Ch. 1 - Are low-voltage systems totally safe? Explain.Ch. 1 - Prob. 21RCh. 1 - What do the letters PPE stand for?...Ch. 1 - Prob. 23RCh. 1 - Where might you obtain information about...Ch. 1 - Prob. 25R
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