Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
Chapter 3, Problem 8RQ
To determine
The current in the circuit.
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3. (i) Three identical capacitors are connected in delta with 400 V. If the line current is 12 A
determine the capacitance of each of the capacitors. If the 0
60° then calculate the
power dissipation in kW when it is connected in STAR
ENGG_AC_Quiz-Format_01/2016-17_V02
(ii) Three coils each having resistance 6Q and inductance are connected in star with
415V. If the line current is 30 A, find the value of inductive reactance as well as
inductance value. If 0
45° then calculate the power dissipation in kW when it is
connected in Delta.
DC and AC subject:
1. Consider a wire carrying a current in the presence of a magnetic field, and a given flux density of 0.25 T. If the wire is 1.0 m long and carries a 0.5 A current, what is the magnitude of the force induced in the wire?
2. The wire shown is moving in the presence of a magnetic field. With the information given in the figure, determine the magnitude and direction of the induced voltage in the wire. (see the figure below)
There is a total of 500 mA of current
into five parallel resistors. The currents
through four of the resistors are 50
mA, 150 mA, 25 mA, and 100 mA. What
is the current through the fifth
resistor?
Chapter 3 Solutions
Electrical Transformers and Rotating Machines
Ch. 3 - How many degrees are the current and voltage out...Ch. 3 - How many degrees are the current and voltage out...Ch. 3 - To what is inductive reactance proportional?Ch. 3 - Four inductors, each having an inductance of 0.6...Ch. 3 - Three inductors are connected in parallel....Ch. 3 - Prob. 6RQCh. 3 - An inductor is connected to a 240-V, 1000-Hz line....Ch. 3 - Prob. 8RQCh. 3 - Prob. 9RQCh. 3 - An inductor has an inductive reactance of 250 Ω...
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Similar questions
- Four inductors, each having an inductance of 0.6 H, are connected in series. What is the total inductance of the circuit?arrow_forwardAn inductor is connected to a 240-V, 1000-Hz line. The circuit current is 0.6 A. What is the inductance of the inductor?arrow_forwardA current transformer has 4 turns of wire in its primary winding. How many turns of wire are needed in the secondary winding to produce a current of 2 amperes when a current of 60 amperes flows in the primary winding?arrow_forward
- A current transformer has a ratio of 600:5. If three loops of wire are wound through the transformer core, how much primary current is required to produce 5 amperes of current in the secondary winding?arrow_forward34. Four 10 mH inductors are in series. The total inductance is ( a) 40,000 μΗ (b) 40 mH (c) 30 H (d) none of abovearrow_forwardIf the secondary of the transformer in question 5 supplies a current of 9.6 amperes to a load, what is the primary current? (Disregard excitation current.)arrow_forward
- Assume that a primary current of 75 amperes flows through the windings of the transformer in question 4. How much current will flow in the secondary winding?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_forwardWhat are the three types of opposition to current flow that impedance represents?arrow_forward
- If a single-phase load is connected across the two line conductors and neutral of the transformer in question #2, and one line has a current of 80 amps and the other line has a current of 68 amps, how much current is flowing in the neutral conductor?arrow_forward1. For the circuit below, determine the output voltage. 30 v Si Ge 2ka Vo 2kaarrow_forwardThe arc length voltage characteristic of a DC arc is given by the equation V=24+4L where 'V' is the arc voltage in volts and L' is the length in mm. The static volt-ampere characteristic of the power source is approximated by a straight line with no load voltage of 80V and the short circuit current of 600A. Then the optimum arc length is (mm).arrow_forward
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