Electric Circuits Fundamentals & Lab Mnl Pk
8th Edition
ISBN: 9780136125136
Author: Unknown
Publisher: PEARSON
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Chapter 8, Problem 9TFQ
To determine
Whether the given statement is true or false.
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A 50 Hz, 3-phase induction motor is working at a full load speed of 1440 r.p.m. The full load slip will be
a.
0.12
b.
0.06
c.
0.08
d.
0.04
in the shaded-pole induction motor, the direction of rotation of the magnetic field is determined by the _____
In three-phase induction motor rotor speed is zero at the time of starting the induction motor.
Select one:
True
False
Chapter 8 Solutions
Electric Circuits Fundamentals & Lab Mnl Pk
Ch. 8 - The period of a 60 Hz sine wave is 16.7 ms.Ch. 8 - The rms and average value of a sine wave are the...Ch. 8 - Prob. 3TFQCh. 8 - The peak value of a sine wave is the same as its...Ch. 8 - The number of radians in 360 is 2 .Ch. 8 - In a three-phase electrical system, the phases are...Ch. 8 - The purpose of an exciter is to supply dc rotor...Ch. 8 - In an automotive alternator, the output current is...Ch. 8 - Prob. 9TFQCh. 8 - A synchronous motor can be used when constant...
Ch. 8 - Prob. 1STCh. 8 - During each cycle, a sine wave reaches a peak...Ch. 8 - A sine wave with a frequency of 12 kHz is changing...Ch. 8 - Prob. 4STCh. 8 - When a sine wave has a frequency of 60 Hz, in 10 s...Ch. 8 - Prob. 6STCh. 8 - Prob. 7STCh. 8 - The average value of a 10 V peak sine wave over...Ch. 8 - Prob. 9STCh. 8 - Prob. 10STCh. 8 - The instantaneous value of a 15 A peak sine wave...Ch. 8 - If the rms curren through a 10k resistor is 5 m A,...Ch. 8 - Prob. 13STCh. 8 - Prob. 14STCh. 8 - Prob. 15STCh. 8 - Prob. 16STCh. 8 - Prob. 17STCh. 8 - Prob. 1TSCCh. 8 - Prob. 2TSCCh. 8 - Prob. 3TSCCh. 8 - Prob. 4TSCCh. 8 - Prob. 5TSCCh. 8 - Calculate the frequency for each of the following...Ch. 8 - Calculate the period for each of the following...Ch. 8 - A sine wave goes through 5 cycles in 10s. What is...Ch. 8 - A sine wave has a frequency of 50 kHz. How many...Ch. 8 - How long does it take a 10 kHz sine wave to...Ch. 8 - A sine wave has a peak value of 12 V. Determine...Ch. 8 - A sinusoidal current has an rms value of 5 mA....Ch. 8 - For the sine wave in Figure 8-74, determine the...Ch. 8 - If each horizontal division in Figure 8-74 is 1...Ch. 8 - In Figure 8-74, what is the instantaneous voltage...Ch. 8 - Sine wave A has a positive-going zero crossing at...Ch. 8 - One sine wave has a positive peak at 75 and...Ch. 8 - Draw two since waves as follows: Sline wave A is...Ch. 8 - Convert the following angular values from degrees...Ch. 8 - Convert the following angular values from radians...Ch. 8 - A certain sine wave has a positive-going zero...Ch. 8 - For a particular 0 reference sinusoidal current,...Ch. 8 - For a 0 reference sinw wave with an rms value of...Ch. 8 - Sine wave A lags sine wave B by 30. Both have peak...Ch. 8 - Repeat Problem 19 for the case when sine wave A...Ch. 8 - A sinusoidal voltage is applied to the resistive...Ch. 8 - Find the half-cycle average values of the voltages...Ch. 8 - Determine th rms voltage across R3 in Figure 8-77.Ch. 8 - A sine wave with an rms value of 10.6 V is riding...Ch. 8 - How much dc voltage must be added to a 3 V rms...Ch. 8 - A 6 V peak sine wave is riding on a dc voltage of...Ch. 8 - The conductive wire loop on the rotor of a simple...Ch. 8 - Prob. 28PCh. 8 - At what speed of rotation must a four-pole...Ch. 8 - A common frequency for alternators on aircraft is...Ch. 8 - Prob. 31PCh. 8 - Explain how the field in a three-phase motor...Ch. 8 - From the graph in Figure 8-78, determine the...Ch. 8 - Determine the duty cycle for each pulse waveform...Ch. 8 - Find the average value of each positive-going...Ch. 8 - What is the frequency of each waveform in Figure...Ch. 8 - What is the frequency of each sawtooth waveform in...Ch. 8 - A square wave has a period of 40s. List the first...Ch. 8 - What is the fundamental frequency of the square...Ch. 8 - Determine the peak value and the period of the...Ch. 8 - Determine the rms value and the frequency of the...Ch. 8 - Determine the rms value and the frequency of the...Ch. 8 - Find the amplitude, pulse width, and duty cycle...Ch. 8 - A certain sine wave has a frequency of 2.2 kHz and...Ch. 8 - Figure 8-84 shows a sinusoidal voltage source in...Ch. 8 - A nonsinusoidal waveform called a stairstep is...Ch. 8 - Refer to the oscilloscope screen in Figure 8-86....Ch. 8 - Accurately draw on a grid representing the scope...Ch. 8 - Accurately draw on a grid representing the scope...Ch. 8 - Based on the instrument settings and an...Ch. 8 - Examine the circuit board and the oscilloscope...Ch. 8 - Prob. 52PCh. 8 - www. prenhall.com/floyd. 53. Open file P08-53 and...Ch. 8 - www. prenhall.com/floyd. 54. Open file P08-54 and...Ch. 8 - www. prenhall.com/floyd. 55. Open file P08-55 and...Ch. 8 - www. prenhall.com/floyd. 56. Open file P08-56 and...
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- Varying the DC voltage to the rotor field changes the a. motor speed. b. power factor. c. phase excitation. d. slip.arrow_forwardThe speed of a synchronous motor is fixed by the a. rotor winding. b. amortisseur winding. c. supply voltage. d. frequency of power supply and number of poles.arrow_forwardA 3-phase induction motor has a slip value of 0.02 and a slip frequency of 50Hz. What is the frequency of the voltage induced in this rotor?arrow_forward
- The rotor circuit of a wound-rotor motor becomes more inductive as the resistance is removed, causing the ________ to increase. a. Impedance b. Output voltage c. Phase angle d. Torquearrow_forwardA 10-pole, 3-phase induction motor operates from a supply with frequency 55 Hz. Calculate the speed of the rotor when the slip is 5%.arrow_forwardIf a 3-phase induction motor has synchronous speed of 900 rpm and the frequency in stator is 60Hz, then the number of poles will bearrow_forward
- To change the direction of rotation of a series wound DC generator the general rule is toarrow_forwardDetermine the value of the capacitor to raise the power factor to unity when two induction motor must be connected to a capacitor . The first motor is twenty-four kilo watts and power factor 0.8, while the other is forty kilo watts and power factor 0.95.arrow_forwardInduction machine: Find the number of poles required, if the frequency is 50Hz and speed of the motor is 1000 rpm.arrow_forward
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