EBK ELECTRICAL TRANSFORMERS AND ROTATIN
4th Edition
ISBN: 9781337025867
Author: Herman
Publisher: VST
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Chapter 13, Problem 5RQ
To determine
Whether the transformer is derated or not and the magnitude of the derated amount.
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4. A circuit contains a 20-2 resistor and
an inductor with an inductance of
0.093 H. If the circuit has a frequency
of 60 Hz, what is the total impedance
of the circuit?
5. An R-L series circuit has a power
factor of 86%. By how many degrees
are the voltage and current out of
phase with each other?
6. An R-L series circuit has an apparent
power of 230 VA and a true power of
180 W. What is the reactive power?
7. The resistor in an R-L series circuit
has a voltage drop of 53 V, and the
inductor has a voltage drop of 28 V.
What is the applied voltage of the
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In three phase power measurement using one watt-meter method, if the load is balanced then the
total power is equal to P= 3 W1.
Select one:
True
False
1. For the circuit below, determine the output voltage.
30 v Si Ge 2ka
Vo
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Chapter 13 Solutions
EBK ELECTRICAL TRANSFORMERS AND ROTATIN
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- What is the value of a sinusoidal voltage at 7 us (micro second) from the positive going zero crossing when Vp = 15V and f = 50KHZ ?arrow_forwardA 772 range voltmeter is having an accuracy of + 0.11% of FSD. Calculate the following for the given M1 =677 volt and M2=732 volt. Accuracy= For M1 reading : Maximum Acceptable Value = Minimum Acceptable value = % Error =arrow_forward4. Referring to Figure 3 determine i. The voltage, V1. ii. The current through each inductor, In and I2. 20 1 50 V 6 µF 4H ll 0.5 H Figure 3 llarrow_forward
- A transistor has a DC Beta of 250 and a base current, IB, of 20 microA. The collector current, IC, equals * 5 microamperes 500 microamperes 5 milliamperes 50 milliamperesarrow_forwardThe windscreen washers of an old car don't work (W = 0). This could be for two reasons: the windscreen fluid tank is empty (E = 1) or the tube is has a blockage (B = 1). Being an old car, the light to indicate that the windscreen fluid tank is empty only comes on (L = 1) 75% of the time. It will sometimes comes on even if the tank has some fluid in it, with probability 0.25. Of course the tube could be both blocked and the tank empty. (a) Draw the Bayesian network describing the scenario just described, and express the joint probability in factorised form, defining appropriate variables.arrow_forwardFind the value of the currents I1 and 12. 100 ohm 5V 5V 100 ohm 12 O a. 1=-0.3A, 12=-0.1A O b. 11=0.3A, 12=0.1A Oc. 11=0.05A, 12=0.1A O d. 11=0.1A, 12=0.2Aarrow_forward
- The following data were obtained on a 50 kVA 2400/120 V transformer: Open circuit test, instruments on low voltage side: Waltmeter reading = 396 Watts Ammeter reading = 9.65 amperes Voltmeter reading = 120 Volts Short circuit test, instruments on high voltage side: Waltmeter reading = 810 Watts Ammeter reading = 20.8 amperes Voltmeter reading = 92 Volts Find the efficiency when rated kVA is delivered to a load having a power factor of 0.8 lagging.The following data were obtained on a 50 kVA 2400/120 V transformer : Open circuit test, instruments on low voltage side: Waltmeter reading = 396 Watts Ammeter reading = 9.65 amperes Voltmeter reading = 120 Volts Short circuit test, instruments on high voltage side: Waltmeter reading = 810 Watts Ammeter reading = 20.8 amperes Voltmeter reading = 92 Volts Find the efficiency when rated kVA is delivered to a load having a power factor of 0.8 lagging.arrow_forward10/. A capacitor of 1 μF is connected to a 50 Hz supply. The capacitive reactance (Xc) is ___________. 1591.54 Ω 3183.09 Ω 3.141 Ω 6.283 Ωarrow_forwardQuestion 7 In no-load phasor diagram of the transformer, the core loss component current is with primary voltage. Not yet answered O out of phase & parallel Marked out of O Parallel & in phase 1.00 P Flag question O in phase O Perpendicular & in phase Question 8 In an A.C. circuit, the power measured by using wattmeter is power. Not yet answered Marked out of 1.00 P Flag question Question 9 In step up transformer, secondary turns are less than primary turns. Not yet answered Marked out of Select one: 1.00 P Flag question O True O Falsearrow_forward
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