Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
Chapter 8, Problem 3RQ
To determine
Whether the line values of voltage and current be used or the phase values while computing the voltage and current in three phase transformer.
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Question 7
In no-load phasor diagram of the transformer, the core loss component current is
with primary voltage.
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O in phase
O Perpendicular & in phase
Question 8
In an A.C. circuit, the power measured by using wattmeter is
power.
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Question 9
In step up transformer, secondary turns are less than primary turns.
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Q5/ Determine the Nodal Voltage for the figure
13
V₁
R3
ww
20
z
4A
www
12
Ry 202
R₂602
ZA
The arc length voltage characteristic of a DC arc is given by the equation V=24+4L where
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80V and the short circuit current of 600A. Then the optimum arc length is
(mm).
Chapter 8 Solutions
Electrical Transformers and Rotating Machines
Ch. 8 - How many transformers are needed to make an...Ch. 8 - Two transformers rated at 100 kVA each are...Ch. 8 - Prob. 3RQCh. 8 - Assume that a line voltage of 2400 volts is...Ch. 8 - Prob. 5RQCh. 8 - How much current is flowing through the secondary...Ch. 8 - How much current is flowing through the primary...Ch. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - How much current is flowing in the secondary...
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Similar questions
- An AC power source is connected across 325 turns of an autotransformer, and the load is connected across 260 turns. What is the turns ratio of this transformer?arrow_forwardWhat are the three types of opposition to current flow that impedance represents?arrow_forwardAssume that a line voltage of 2400 volts is connected to the primary of the three-phase transformer and the line voltage of the secondary is 240 volts. What is the turns ratio of the transformer?arrow_forward
- 10 and 11arrow_forwardhow to solve it and how to now if - 120 or +120 i need her solving with explain please quickkarrow_forwardA three-phase transformer connection has a delta-connected primary and a wye-connected secondary. The center tap of the wye is used as a neutral conductor. If the line-to-line voltage is 480 volts, what is the voltage between any one phase conductor and the neutral conductor?arrow_forward
- A 10 kVA transformer has a primary voltage rating of 240 volts and a secondary voltage rating of 480 volts. The transformer is connected to a circuit protected by a 100 ampere circuit breaker. The secondary is protected by a 25-ampere fuse. Does the primary require separate overcurrent protection?arrow_forwardAn open-delta three-phase transformer system has one transformer center-tapped to provide a neutral for single-phase voltages. If the voltage from line to center tap is 277 volts, what is the high-leg voltage?arrow_forward8. An R-L series circuit has a reactive power of 1234 VARs and an apparent power of 4329 VA. By how many degrees are voltage and current out of phase with each other? 9. An R-L series circuit contains a resistor and an inductor. The resistor has a value of 6.5 22. The circuit is connected to 120 V and has a current flow of 12 A. What is the inductive reactance of this circuit? 10. What is the voltage drop across the resistor in the circuit in Question 9? 11. A phase angle meter connected in an R-L series circuit indicates that the current is 28 degrees out of phase with the voltage. What is the circuit power factor? 12. An R-L series circuit has a power factor of 73%. If the apparent power is 560 kVA, what is the true power in the circuit?arrow_forward
- What is the peak voltage of a 120V RMS AC voltage?arrow_forwardA load impedance of 52 Ω is connected to the secondary winding of the transformer in question 3. How much current will flow in the secondary?arrow_forwardFour inductors, each having an inductance of 0.6 H, are connected in series. What is the total inductance of the circuit?arrow_forward
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