2. A 40 Hp, 460 V, three-phase, 60 Hz, induction motor has an efficiency of 93.6% whenoperating at 75% loading, with a power factor of 83%. The two-wattmeter method is usedmeasure the power drawn by the motor. Wattmeter, W₁, wattmeter has its currentconnected in the yellow line, and its voltage coil between the yellow and red lines.Calculate the power measured by each wattmeter if:a.The motor is star-connected.b. The motor is delta-connected.=Note: 1 Hp 746 WCS Scanned with CamScanner

Answered: 2. A 40 Hp, 460 V, three-phase, 60 Hz,…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter7: Alternating Current, Power Distribution, And Voltage Systems

Section: Chapter Questions

Problem 8RQ

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(b) A 4-pole 3 phase alternator is driven at 1200 rpm. What is the frequency of the output voltage of the alternator? Explain how the same alternator can be used to generate voltage at 50 Hz.
v. With reference to an 50 Hz3 phase alternator explain how P,Q,V and F are controlled.
A single phase AC motor draws 4.5 A from 220 V electricity. Three various power of the motor from the mains is 720 W. a) Calculation of the power factor of the engine. b) Calculating the Capacitance (C) and Power of the capacitor required to make the power coefficient of the motor 0,95
A dc generator has no load output voltage of 120V. Its armature circuit resistance is 0.95 ohm and its field coils are separately energized. If the load is rated 2000 watts at 115V, what power could be delivered to the load?
Pls answer no. 3
The current and voltage outputs of an operating ac generator have peak values of 2.5 A and 16 V, respectively. a) What is the average power output of the generator? b) What is the effect resisstance of the circuit it is in?
The voltage generated across one inductor of an alternator is 8.11V. There are 120 slots and 4 turns in every coil. The conductors are all in series and connected in double layer lap windings distributed sinusoidally in several slots. The coil pitch is 10 slots, frequency is 60 Hz and synchronous speed is 720 rpm. Calculate the line-to-line generated voltage if the alternator windings are connected wye.
Correct the power factor for a motor connected in series with a 120V RMS 60Hz power supply. The motor has an inductance of 200mH and an internal resistance of 30 ohms.
III. Problem Solving. Compute up to FOUR decimal places. BOX your final answers (with units). 1. What is the equation of the waveform in figure 1? 2. A coil takes 15A from a 250V source. When a 20 Ohm resistor is connected across the coil. The combination draws a total current of 25A. Determine the resistance and inductive reactance of the coil. 3. In the single-phase power system in figure 2, determine the voltage, Vab, and current, I b, being received by the load, 10 +j15 N. V, volts 10 ms AV 100 V Figure 1 250 V 0, deg t, msec CS Scanned with CamScanner j8n 120280°V 12 j3N 252 M €150 121 j45 1 1.250 /150 2.5.2 b Figure 2 j6n j12A
An alternating current of frequency 60 Hz has a maximum value of 120A. Write down the equation for its instantaneous value. Reckoning time from the instant the current is zero and its becoming positive, find a) the instantaneous value after 1/360 seconds and b) the time taken to reach 96A for the first time
A single-phase AC motor is connected to a 550-V, 50-Hz supply. A clamp-on ammeter indicates the motor has a current draw of 25 A at full load. A wattmeter connected to the motor indicates a true power of 10 kW. How much capacitance is needed to correct the power factor to 99%?
Show solution When the speed of an alternator is changed from 3600 rpm to 1800 rpm, the generated emf per phase will become. ½ 2x 4x 1/4

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