Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 18, Problem 1PP
Assume that the circuit shown in Figure 18-1 is connected to a 60-Hz line and has a total current flow of 34.553 A. The inductor has an inductance of 0.02122 H, and the resistor has a resistance of 14
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QUESTION 13
E-06, PC-05. An induced current in a coil?
Does not affect the EMF producing it.
Aids the EMF producing it.
Opposes the EMF producing it.
QUESTION 14
E-06, PC-05. The induced EMF in a coil can be increases by?
By adding more number of turns.
Decrease the change in flux.
Increase the change in time.
QUESTION 15
E-06, PC-03. An Inductor's time constant is given by?
O L2 /R.
L/R.
LR.
please answer 4 four questions correctly and no need to write your explnation just final answer
1. The various types of errors in dynamometer wattmeters are
A./Error due to Eddy currents
B./Error due to pressure coil inductance
C./All of above
D./Error due to pressure coil capacitance
E./Error due to friction
2.The primary winding of a potential transformer has
A./no turns
B/a larger number of turns
C/a few turns only
D/intermediate number of turns
3. The current transformer (CT) and potential transformer (PT) are used for
A.measuring low current and voltages
B.measuring high resistances and frequencies
C.measuring very low current and voltages
D.measuring high currents and voltages
4. The secondary winding of a potential transformer has
A/ no turns
B.intermediate number of turns
C.a few turns only
D.a large number of turns
QUESTION 19
E-06, PC-02. Three inductors 15 mH, 15 mH and 15 mH are connected in series. What is the total inductance?
O 5 mH.
Without knowing the coupling factor the total inductance cannot be found.
45mH.
QUESTION 20
E-06, PC-05. Why are the iron cores of most induction coils laminated?
To increase the core permeability.
O To reduce the core reluctance.
O To reduce the effects of eddy currents.
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Chapter 18 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 18 - 1. When an inductor and a resistor are connected...Ch. 18 - 2. An inductor and resistor are connected in...Ch. 18 - 3. What is the impedance of the circuit in...Ch. 18 - 4. What is the power factor of the circuit in...Ch. 18 - How many degrees out of phase are the current and...Ch. 18 - 6. In the circuit shown in Figure 18-1, the...Ch. 18 - 7. A resistor and an inductor are connected in...Ch. 18 - The R-L parallel circuit shown in Figure 18-1 has...Ch. 18 - The R-L parallel circuit shown in Figure 18-1 has...Ch. 18 - How many degrees out of phase are the total...
Ch. 18 - Incandescent lighting of 500 W is connected in...Ch. 18 - You are working on a residential heat pump. The...Ch. 18 - Assume that the circuit shown in Figure 18-1 is...Ch. 18 - Assume that the current flow through the resistor,...Ch. 18 - Assume that the circuit in Figure 18-1 has an...Ch. 18 - Assume that the circuit in Figure 18-1 has a power...Ch. 18 - In an R-L parallel circuit, R=240 and XL=360. Find...Ch. 18 - In an R-L parallel circuit, IT=0.25 amps, IR=0.125...Ch. 18 - In an R-L parallel circuit, ET=120 volts,...Ch. 18 - In an R-L parallel circuit, ET=48 volts, IT=0.25...Ch. 18 - In an R-L parallel circuit, ET=240 volts, R=560 R...Ch. 18 - In an R-L parallel circuit, ET=240 volts, R=560,...Ch. 18 - In an R-L parallel circuit, ET=208 volts, R=2.4k,...Ch. 18 - In an R-L parallel circuit, ET=480 volts, R=16,...Ch. 18 - In an R-L parallel circuit, IT=1.25 amps, R=1.2k,...Ch. 18 - In an R-L parallel circuit, true power =4.6 watts...Ch. 18 - An R-L parallel circuit is connected to 240 volts...Ch. 18 - An R-L parallel circuit has an applied voltage of...
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- 3. If the ratio of V/F has been kept constant and the observed value of hysteresis loss at rated frequency of 50 Hz is 18 W, the measured value of core losses is 35 W, Find the total core losses at the frequency of 60 Hz. 02:arrow_forwardMatch the following: (i) Hysteresis loss (a) Can be redud by constructing the core with laminated sheets of alloy steel (ii) Eddy current loss (b) Can be reduced by the use of special high grades of alloy stl as core material.arrow_forward17 By laminating the core, the Hysteresis losses can be reduced. Select one: True Falsearrow_forward
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