Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 33, Problem 36RQ
To determine
How to set the neutral plane position using the compensating winding
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With the aid of a circuit diagram, show that two
wattmeters can be connected to read the total power in
a three-phase, three-wire system.
Two wattmeters connected to read the total power
in a three-phase system supplying a balanced load read
10.5 kW and −2.5 kW respectively. Calculate the total
active power.
Drawing suitable phasor diagrams, explain the
significance of: (a) equal wattmeter readings; (b) a zero
reading on one wattmeter.
ANS:
8 kW
A factory has the following load with power factor of 0.9 lagging in each
phase. Red phase 40 A, yellow phase 50 A and blue phase 60 A. If the supply
is 400 V, three-phase, four-wire, calculate the current in the neutral and the
total active power. Draw a phasor diagram for phase and line quantities.
Assume that, relative to the current in the red phase, the current in the yellow
phase lags by 120° and that in the blue phase leads by 120°.
Fundimentals of Energy Systems Q8
Chapter 33 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 33 - What are the three basic types of split-phase...Ch. 33 - The voltages of a two-phase system are how many...Ch. 33 - How are the start and run windings of a...Ch. 33 - In order to produce maximum starting torque in a...Ch. 33 - What is the advantage of the capacitor-start...Ch. 33 - On average, how many degrees out of phase with...Ch. 33 - What device is used to disconnect the start...Ch. 33 - Why does a split-phase motor continue to operate...Ch. 33 - How can the direction of rotation of a split-phase...Ch. 33 - If a dual-voltage split-phase motor is to be...
Ch. 33 - When determining the direction of rotation for a...Ch. 33 - What type of split-phase motor does not generally...Ch. 33 - What type of single-phase motor develops the...Ch. 33 - Prob. 14RQCh. 33 - Prob. 15RQCh. 33 - When a repulsion-start induction-run motor reaches...Ch. 33 - Prob. 17RQCh. 33 - What causes the magnetic field to rotate in a...Ch. 33 - How can the direction of rotation of a shaded-pole...Ch. 33 - Prob. 20RQCh. 33 - Prob. 21RQCh. 33 - Prob. 22RQCh. 33 - Prob. 23RQCh. 33 - Prob. 24RQCh. 33 - What is the principle of operation of a stepping...Ch. 33 - What does the term bifilar mean?Ch. 33 - Prob. 27RQCh. 33 - When a stepping motor is connected to AC power,...Ch. 33 - What is the synchronous speed of an eight-pole...Ch. 33 - How can the holding torque of a stepping motor be...Ch. 33 - Why is the AC series motor often referred to as a...Ch. 33 - Prob. 32RQCh. 33 - How is the direction of rotation of the universal...Ch. 33 - Prob. 34RQCh. 33 - Prob. 35RQCh. 33 - Prob. 36RQCh. 33 - Prob. 1PA
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Two wattmeters are used to measure power in a three phase, three-wire network. Show by means of connection and complexor (phasor) diagrams that the sum of the wattmeter readings will measure the total active power. Two such wattmeters read 120 W and 50 W when connected to measure the active power taken by a balanced three-phase load. Find the power factor of the load. If one wattmeter tends to read in the reverse direction, explain what changes may have occurred in the circuit ANS: 0.815arrow_forwardFundimentals of Energy Systems Q7arrow_forwardFundimentals of Energy Systems Q6arrow_forward
- * 7.29 The current source in the circuit of Fig. P7.29 is given by is(t) = 12 cos(2л × 10¹t — 60°) mA. - Apply the phasor-domain analysis technique to determine ic(t), given that R= 20 2 and C = 1 μF.arrow_forwardPROBLEMS 7.33 Find ia(t) in the circuit of Fig. P7.33, given that Us(t) = 40 sin(200t -20°) V.arrow_forward7.25 Determine the impedances of the following elements: (a) R 1 k at 1 MHz = (b) L= 30 μH at 1 MHz *(c) C = 50 μF at 1 kHzarrow_forward
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