EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 3, Problem 3R
To determine
Explain the effect of rating of the branch circuit protective device when the conductors used are of a larger size.
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A generating station is to supply four regions of load [15MW,10 MW,20MW,3MW].
The diversity factor at the station is 1-6. Calculate:
(i) The maximum demand on the station.
(ii) Suggest the installed capacity and the number of units.
NOT: Taking installed capacity to be 20% more than the maximum demand.
Pick up the correct answer
1. Most of the high-voltage transmission lines are
A. Underground.
B. Overhead
2. High-voltage transmission lines use
A. Suspension insulators
C. Wireless D. None of them.
B. Pin insulators
C. Both A and B
D. None of them.
C. Either of the above
D. None of the above
3. The load on distributors systems are generally
A. Balanced
B. Unbalanced
4. A feeder in a transmission system feeds power to
A. Distributors B. Generating stations C. Service mains D. All of the above
5. Corona loss increases with
A. Decrease in conductor size & increase in supply frequency.
B. increase in both conductor size and supply frequency.
C. Decrease in both conductor size and supply frequency.
D. Increase in conductor size and decrease in supply frequency.
6. If the length of a cable is doubled. Its capacitance is
C. Quadrupled D. None of the above
7. The distributors for residential areas are
B. 3-D three wire
B. 20V
C. 3-0 four wire D. None of the above
8. Five photocells are…
Chapter 3 Solutions
EBK ELECTRICAL WIRING RESIDENTIAL
Ch. 3 - Prob. 1RCh. 3 - How are branch circuits rated? See NEC 210.3._____Ch. 3 - Prob. 3RCh. 3 - Prob. 4RCh. 3 - What spaces are not included in the floor area...Ch. 3 - What is the unit load per square foot for dwelling...Ch. 3 - According to NEC 210.50(C), a laundry equipment...Ch. 3 - How is the total load in volt-amperes for lighting...Ch. 3 - How is the total lighting load in amperes...Ch. 3 - How is the required number of branch circuits...
Ch. 3 - What is the minimum number of 15-ampere lighting...Ch. 3 - How many lighting branch circuits are provided in...Ch. 3 - Prob. 13RCh. 3 - How is the load determined for outlets supplying...Ch. 3 - What type of circuits must be provided for...Ch. 3 - Prob. 16RCh. 3 - In a single-family dwelling, how is overcurrent...Ch. 3 - Prob. 18RCh. 3 - The minimum number of outdoor receptacles for a...Ch. 3 - The Code indicates the rooms in a dwelling that...Ch. 3 - Prob. 21RCh. 3 - Prob. 22RCh. 3 - Prob. 23RCh. 3 - Prob. 24RCh. 3 - Prob. 25RCh. 3 - Although the Code contains many exceptions to the...Ch. 3 - The rating of a branch circuit is based on (Circle...Ch. 3 - a. A 25-ampere branch-circuit conductor is derated...Ch. 3 - Prob. 29RCh. 3 - Prob. 30RCh. 3 - Prob. 31RCh. 3 - Prob. 32RCh. 3 - A split-level home has one stairway that has six...Ch. 3 - Prob. 34RCh. 3 - Prob. 35RCh. 3 - Prob. 36RCh. 3 - In the past, it was common practice to connect the...Ch. 3 - If a residence has two bathrooms, the Code states:...Ch. 3 - Prob. 39RCh. 3 - Prob. 40RCh. 3 - Prob. 41RCh. 3 - Prob. 42RCh. 3 - Prob. 43R
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