Electric Circuits Fundamentals & Lab Mnl Pk
8th Edition
ISBN: 9780136125136
Author: Unknown
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 10TFQ
A synchronous motor can be used when constant speed is required.
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A four-pole synchronous motor needs to operate at a speed of 1000 rpm. Determine the frequency of the required ac source.
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Induction Motor
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_forwardA synchronous motor can be used to increase the power factor of an electrical system by a. reducing the speed. b. overexciting the stator field. c. operating at unity power factor. d. applying DC to the stator field.arrow_forwardA 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. 0.04arrow_forward
- A 4-pole synchronous motor runs at 1645 r.p.m. at a certain instant. What is the system frequency at that instant? * A. 54.8 Hz B. 56.7 Hz C. 61.2 Hz D. 48.3 Hzarrow_forwardA synchronous motor rotating at 900 rpm, is used as the prime-mover of the generator that have four-pair of magnets. Compute the frequency of the generatorarrow_forwardFind the desired ones since the rotating field speed of an asynchronous motor with a frequency of 50Hz is 750 rpm. a) number of Poles of motor b) motor shift while rotor speed is 725 rpmarrow_forward
- Frequency of emf in the stator of a 8 pole induction motor is 50Hz and the rotor emf frequency is 1Hz. The motor speed is ................ Answerarrow_forwardin the shaded-pole induction motor, the direction of rotation of the magnetic field is determined by the _____arrow_forwardAn overexcited Synchronous motor at no-load means that the PF angle is equal to: Select one: a. 45º leading b. 0º leading c. 90º leading d. 45º lagging e. 90º laggingarrow_forward
- In three-phase induction motor rotor speed is zero at the time of starting the induction motor. Select one: True Falsearrow_forwardWhen the supply frequency is 50Hz, synchrnous speed is 1500rpm and the rotor speed is 750 rpm. If the motor start rotating in the opposite direction, then find the frequency of the rotor.arrow_forwardThe 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_forward
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