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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What is the KW rating of a three phase 975 KVA generator at A) unity power factor B) 80% power factor C) 50% power factor
In the three-phase alternator, explain why the voltage increases less rapidly as the DC current increases. please show your answer clean or readable. Thank you.
Two 800kW alternators A and B operating in parallel. The speed regulation of A is 100% to 103% from full load to no-load and that of B is 100% to 104%. Determine the kW share of A if the total load is 1200kW.
(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.
The voltage regulation of alternator can be regulated by changing its rotational speed. O True O False
A three-phase, star-connected alternator has 8 number of poles, armature with 160 slots and 2 conductors per slot. The speed of rotation is 1000 rpm. The flux per pole is 0.06 weber. If the winding factor is 0.94 and all the conductors in each phase are in series. Calculate a) Frequency of generation b) Number of turns c) EMF generated (phase voltage) d) EMF generated (Line voltage)
A 12 V generator has an internal resistance of 0.05 ohm. Two loads are connected in parallel to its terminals, one drawing a 12 A current and the other dissipating energy at the rate of 200 W. What is the terminal voltage of the generator with this load? Ans. 0.82 volts
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
Three coils each having resistance of 17 Q are connected in star across 437 V, 50 Hz supply. Then the total power consumed is O 6485.84 W O 33700.41 w O 660.83 W O 756.93 W When the load on a series generator is decreased, then the flux produced will be decreased in direct proportion. Select one: O True OMIEE21 O False
3.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. a. 2400Vb. 4160Vc. 4800Vd. 856V
Can V curve be plotted for an alternator. If yes then what is the difference between V curve of an alternator and V curve of a motor.

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