ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
19th Edition
ISBN: 9781337116213
Author: MULLIN
Publisher: CENGAGE L
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Chapter 4, Problem 17R
To determine
Mention the protection provided at cable ends when Type AC cable is used.
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Students have asked these similar questions
1. A 220V d.c. shunt motor has a 5V brush drop, an armature resistance of 0.20, and a rated armature
current of 40A. Calculate:
(a) the counter-back e.m.f. (EC),
(b) power developed by the armature (Pd) in watts
(c) mechanical power developed by the armature in horsepower.
Ans.[207V, 8280 W, 11.099hp]
Tests are carried on 400 V, 60 Hz, Y-connected, wound rotor three-phase induction motor with
the following test results:
DC Test: 21 V, 43 A
No Load Test: 400 V, 20 A, 1200 W, 60 Hz
Blocked Rotor Test: 100 V, 44 A, 2700 W, 19 Hz
Find R1, X1, R2, X2, and Xm of this motor?
xxx₁ = 0.5xbm fy
Pen Pd
51-5
NN (1-5)
1208
1 [10Marks]
N
wr
P
5- A 250 V shunt motor operates on full load at 1500 rpm and draws line current 20 A.
The armature has 6 poles and is lap wound with 200 turns. Find the induced emf and the
flux/pole at full load. Given that the armature and field resistances are 0.5 and 125 2
respectively. Ans.[ 24.1 m Wb]
Chapter 4 Solutions
ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
Ch. 4 - The largest size solid conductor generally...Ch. 4 - What is the minimum branch-circuit wire size that...Ch. 4 - What exceptions, if any, are there to the answer...Ch. 4 - What determines the ampacity of a wire?Ch. 4 - What unit of measurement is used for the diameter...Ch. 4 - What unit of measurement is used for the...Ch. 4 - What is the voltage rating of the conductors in...Ch. 4 - Indicate the allowable ampacity of the following...Ch. 4 - Prob. 9RCh. 4 - What are the colors of the conductors in...
Ch. 4 - For nonmetallic-sheathed cable, may the...Ch. 4 - Prob. 12RCh. 4 - Under what condition may nonmetallic-sheathed...Ch. 4 - a. What is the maximum distance permitted between...Ch. 4 - Prob. 15RCh. 4 - Prob. 16RCh. 4 - Prob. 17RCh. 4 - Prob. 18RCh. 4 - Prob. 19RCh. 4 - Circle the correct answer to the following...Ch. 4 - When running Type NM cable through a bored hole in...Ch. 4 - Where is the main service-entrance panel located...Ch. 4 - Is it permitted to use flexible metal conduit over...Ch. 4 - Liquidtight flexible metal conduit may serve as a...Ch. 4 - It is permissible for an electrician to connect...Ch. 4 - Terminals of switches and receptacles marked...Ch. 4 - Wire connectors marked AL/CU are suitable for use...Ch. 4 - A wire connector bearing no marking or reference...Ch. 4 - When Type NM cable is run through a floor, it must...Ch. 4 - When nonmetallic-sheathed cables are bunched or...Ch. 4 - In diagrams A and B, nonmetallic-sheathed cable is...Ch. 4 - The marking on the outer jacket of a...Ch. 4 - A 120-volt branch circuit supplies a resistive...Ch. 4 - In problem 35, it is desired to keep the voltage...Ch. 4 - Prob. 37RCh. 4 - The allowable ampacity of a 4 AWG THHN from Table...Ch. 4 - If, because of some obstruction in a wall space,...Ch. 4 - The recessed fluorescent luminaires installed in...Ch. 4 - Prob. 41RCh. 4 - What size overcurrent device protects the...Ch. 4 - May the 20-ampere small-appliance branch circuits...Ch. 4 - A 30-ampere branch circuit is installed for an...Ch. 4 - In many areas, metal framing members are being...Ch. 4 - Are set screwtype connectors permitted to be used...Ch. 4 - Most armored cable today has 90C conductors. What...Ch. 4 - If you saw two different types of SE cables, how...Ch. 4 - Circle the correct answer defining the type of...
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