Two three-phase alternators operate in parallel and the excitation is such that the induced emfs are 1 kV/ph. The load admittance is (0,427 – j0,214) S. The admittance/phase of the machines are (0,0262 – j0,499) S and (0,0218 – j0,312) S respectively. The emf of B leads A by 10°e. Calculate: (a) the terminal voltage (b) the current supplied by A (c) the power factor of B

Two three-phase alternators operate in parallel and the excitation is such that the induced emfs are 1 kV/ph. The load admittance is (0,427 – j0,214) S. The admittance/phase of the machines are (0,0262 – j0,499) S and (0,0218 – j0,312) S respectively. The emf of B leads A by 10°e. Calculate: (a) the terminal voltage (b) the current supplied by A (c) the power factor of B

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 7RQ

See similar textbooks

Similar questions

The regulation of an alternator is likely to be negative in case of resistive load O True O False
The reactive power output of an alternator is limited by load angle True False
The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9 II. 120 slots, six poles, span 1 to 16 II. 144 slots, eight poles, span 1 to 11 The windings having a pitch factor less than 0.9 are a. I and II only b. I, Il and III. c. I and II only d. Il and III only
If a Load absorbs 10 kVA at a leading power factor of 0.6. Then the complex power is: Select one: a. 6000 - j8000 VA b. 6000 + j8000 VÀ C. -6000 - j8000 VA O d. None of these
6. What is the effect of load inductance on the ripple current? 7. i effect of chonnine Bock and boost 8. Wh 9 What chopping 10. At what duty evcle does the load current rinnle current he
The winding data for three different alternators are as follows I. 60 slots, four poles, span 1 to 9 II. 120 slots, six poles, span 1 to 16 III. 144 slots, eight poles, span 1 to 11 The windings having a pitch factor less than 0.9 are O a. I, I and II. O b. I and III only O c. I and II only O d. I and III only
An alternator is at lagging power factor when it is normally excited O True O False
A 3-phase alternator generates an open circuit voltage of 4000 V per phase when exiting current is 50 A, the short circuit current for the same excitation being 800 A. The synchronous reactance per phase is?
The alternator frequency is direct function of rotational speed and number of poles. O True O False
The generated voltage per phase of an alternator is E0 while the speed of rotor rotation is 3000 rpm. On changing the rotor speed to 750 rpm, the generated emf phase will become a. 0.25*E0 b. 0.5*E0 c. 0.75*E0 d. E0
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 3-phase alternator has 3 slots per pole. The distributed factor of the winding is?