19th Edition

ISBN: 9781337116213

Author: MULLIN

Publisher: CENGAGE L

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Chapter 4, Problem 5R

What unit of measurement is used for the diameter of wires?

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Chapter 4, Problem 4R

Chapter 4, Problem 6R

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2. A DC generator is shown below. This DC generator is driven by a prime mover and rotating in counterclockwise direction. The armature is connected with a load resistor. (i) Using cross (x) or dot (*) to indicate the current direction of each conductor in the armature. (ii) If we want to reverse the polarity of the generated armature voltage, what can we do to? rotation S load N

6. The figures below show the equivalent circuit of a separately excited DC generator and the approximate relationship between the flux of main field and exciting current. The field current I can be regulated by the variable resistor Ry, and the battery voltage supplying power to the exciter is 12V. The armature resistance Ro is 20, and the load is 182. For the DC generator, we aim to keep the voltage across the load (RL) constant in different speed range conditions. In the beginning, the flux is 0.12 Wb, the DC generator speed is 1000 rpm, and the generated voltage E。 is 100 V. Calculate: (1) The current flowing through the load. (2) When the speed of generator changes to 1500 rpm, how should we adjust the exciting current Ix to ensure Ę is still 100 V. (Hint: E₁ = Zno/60) (3) When the speed of generator changes to 500 rpm, how should we adjust the exciting current Ix to ensure Eo is still 100 V. (Hint: Eo = Zno/60) Rf ww (Wb) 0.17 0.15 12 V 1x F ele 1 1 2 ell Eo Ro ww 9 w RL Ix (A)

7. For a shunt excited motor, the maximum allowable current is twice of the full-load current. The full-load current is 10 A. The equivalent circuit of this motor is also shown below. The rheostat can change the resistance by moving the slider (contact). The counter electromotive force (CEMF) for this motor is 100 V at 1000 rpm. The power supply E, is 200 V. In this case: (1) Calculate the minimum resistor value R at 0 rpm ensuing the motor is running within the safe range, and calculate the power consumed by the rheostat R. (2) Calculate the minimum effective resistor value R at 100 rpm ensuing the motor is running within the safe range, and calculate the power consumed by the rheostat R and the delivered mechanical power. (3) Calculate the minimum resistor value R at 500 rpm ensuing the motor is running within the safe range, and calculate the power consumed by the rheostat R the delivered mechanical power. shunt field R armature rheostat Es + Eo

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. 9R Ch. 4 - What are the colors of the conductors in...

Ch. 4 - For nonmetallic-sheathed cable, may the...Ch. 4 - Prob. 12R Ch. 4 - Under what condition may nonmetallic-sheathed...Ch. 4 - a. What is the maximum distance permitted between...Ch. 4 - Prob. 15R Ch. 4 - Prob. 16R Ch. 4 - Prob. 17R Ch. 4 - Prob. 18R Ch. 4 - Prob. 19R Ch. 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. 37R Ch. 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. 41R Ch. 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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