Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 7RQ
A three-phase load has a phase voltage of 240 V and a phase current of 18 A. What is the apparent power of this load?
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The input power to a 3-phase load is measured as 6700 watts. If the line voltage and line current to the load are 430 V and 18 A respectively.
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Chapter 7 Solutions
Electrical Transformers and Rotating Machines
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - A wye-connected load has a voltage of 480 V...Ch. 7 - A wye-connected load has a phase current of 25 A....Ch. 7 - Prob. 5RQCh. 7 - A delta connection has 30 A of current flowing...Ch. 7 - A three-phase load has a phase voltage of 240 V...Ch. 7 - If the load in question 7 is connected in a wye,...Ch. 7 - An alternator with a line voltage of 2400 V...Ch. 7 - Prob. 10RQ
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- Example 5: A 2400 V/400V single-phase transformer takes a no-load current of 0.5A and the core loss is 400 W. Determine the values of the angle p. and the magnetising and core loss components of the no-load current.arrow_forwardA 3-phase, 50 Hz, 3000 V motor develops 600 H.P. (447·6 kW), the power factor being 0·75 lagging andthe efficiency 0·93. A bank of capacitors is connected in delta across the supply terminals and powerfactor raised to 0·95 lagging. Each of the capacitance units is built of five similar 600-V capacitors.Determine the capacitance of each capacitor.arrow_forwardDC 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)arrow_forward
- A balanced star-connected load of (8 + j6) Q per phase is connected to a Balanced 3- phase 400-V supply. Find the line current, power factor, powerarrow_forwardThe input power to a 3-phase load is measured as 19kW. If the line voltage and power factor of the load are 430 V and 0.6, then the value of line current isarrow_forwardDon't Use Chat GPT Will Upvotearrow_forward
- Please help me solve this questionarrow_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_forwardIf 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_forward
- A wye-connected load has a voltage of 480 V applied to it. What is the voltage dropped across each phase?arrow_forward3. (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.arrow_forwardSolve it quickly pleasearrow_forward
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