Mindtap Electrical, 4 Terms (24 Months) Printed Access Card For Herman's Delmar's Standard Textbook Of Electricity, 6th (mindtap Course List)
6th Edition
ISBN: 9781305634312
Author: Herman, Stephen L.
Publisher: Cengage Learning
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Textbook Question
Chapter 16, Problem 2PA
You are a journeyman electrician working in a large office building. The fluorescent lighting system is operated at 277 V. You have been instructed to replace the existing light ballasts with a new electronic type that is more efficient. The manufacturer of the ballast states that the maximum peak operating voltage for the ballast is 350 V. Will the new electronic ballast operate on the building’s lighting system without harm?
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A consumer has a work area that he wishes to illuminate with single 80W, 220V tungsten fitting. The existing light points, which are to be removed are controlled by a single gang 10A switch. This switch is to remain in the design. How many light fittings will the switch support.
A-Current consumed by one fitting is
B-The switch must carry the current of
C-Number of fitting supported by the switch is
1.a. Which of the following best describes the arc tube for a high-pressure sodium lamp?A. Long and slenderB. Short and wideC. Short and slenderD. Long and wide1.b. The most common electrical contact for a standard tubular T12 fluorescent lamp is called aA. medium skirted base.B. mogul base.C. medium BiPin base.D. 4-pin base.1.c. The two main categories of discharge lamps areA. mercury and high-intensity discharge.B. fluorescent and high-intensity discharge.C. mercury and metal halide.D. fluorescent and incandescent.
Which of the following statements about fluorescent lamps is correct?
a.
Fluorescent lamps have positive electrical resistance, meaning that the resistance increases with the flow of current.
b.
Fluorescent lamps can be operated without a ballast because they self-limit their current consumption.
c.
The ballast in fluorescent and HID lamps serves as a transformer to boost voltage and a choke to limit the flow of current.
d.
Fluorescent lamps don’t need a higher voltage to initiate the electric arc.
e.
Once an arc is struck in a fluorescent lamp, the ionized mercury vapor reduces its conductivity, limiting the flow of current.
Chapter 16 Solutions
Mindtap Electrical, 4 Terms (24 Months) Printed Access Card For Herman's Delmar's Standard Textbook Of Electricity, 6th (mindtap Course List)
Ch. 16 - 1. What is the most common type of AC waveform?
Ch. 16 - 2. How many degrees are there in one complete sine...Ch. 16 - At what angle does the voltage reach its maximum...Ch. 16 - 4. What is frequency?
Ch. 16 - 5. A sine wave has a maximum value of 230 V. What...Ch. 16 - A sine wave has a voltage of 63 V after 22 of...Ch. 16 - 7. A sine wave has a maximum value of 560 V. At...Ch. 16 - A sine wave has a peak value of 433 V. What is the...Ch. 16 - A sine wave has a peak-to-peak value of 88 V. What...Ch. 16 - A DC voltage has an average value of 68 V. What is...
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