Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

problem 1: What do you mean by the term armature reaction? Describe the effect of armature reaction on the terminal voltage of an alternator at:

a) Unity power factor load
b) Zero loading P.F load
c) Zero lagging P-F load and draw the corresponding phasor diagrams.

problem 2: A 3-phase, star-connected, 1000 KVA, 2000v, 50Hz alternator gave the following open circuit and short-circuit test readings:

Field current: A 10 20 25 30 40 45
O.C voltage: V 800 1500 1760 2000 2350 2600
S.C armature current: A 200 250 300
Armature resistance per phase is 0.2?

problem 3: Draw the characteristics and find out the full load percentage regulation at:

a) 0.8 P.F. lead
b) 0.8 p.f lag.

problem 4: A 3-phase, 1500 kvA, star-connected, 50-Hz, 2300v alternator has a resistance of 0.12?. A field current of 70A produces short-circuit current equivalent to fuel load current of 376A in each line. The same field current produces an emf of 700V on open circuit. Find out the synchronous reactance of the machine and its full load regulation at 0.8 lagging power factor.

problem 5: Two three-phase alternators operate in parallel. The rating of one machine is 50MW and that of the other is 100MW. Both alternators are fitted with governors having a drop of 4%. How will the machines share a common load of 100MW?

problem 6: A synchronous generator operates on constant - voltage constant frequency bus bars. Describe the effect of variation of a) excitation b) steam supply on power output, power factor, armature current and load angle of the machine.

problem 7: Two station generators A and B operate in parallel station capacity of A is 50Mw and that of B is 25 Mw. Full load speed regulation of station A is 3% and full load speed regulation of B is 3.5%. Compute the load sharing if the connected load is 50MW, No-load frequency is 50Hz.

problem 8: What do you mean by the term synchronization of alternator? describe any one method of synchronizing?

problem 9: Describe the various methods for synchronization of alternators?

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M93630
  • Price:- $70

Priced at Now at $70, Verified Solution

Have any Question? 


Related Questions in Electrical & Electronics

1 what is the direction of the magnetic field for a uniform

1. What is the direction of the magnetic field for a uniform plane wave having its electric field in the positive z-direction and propagating in the positive x-direction? 2. What is intrinsic impedance? What is its value ...

1 a synchronous alternator is supplying 09 pu power to the

(1) A synchronous alternator is supplying 0.9 p.u. power to the grid when a temporary three-phase short occurs on the interconnector. The power angle curves are:- Pre-fault = 2.0 sin(delta) During fault = 0.5 sin(delta) ...

Figure 3013 shows a router using priority queuing at the

Figure 30.13 shows a router using priority queuing at the input port. The arrival and required service times (transmission time is negligible) for 10 packets are shown below; ti means that the packet has arrived i ms aft ...

The trigonometric fourier series of a certain periodic

The trigonometric Fourier series of a certain periodic signal is given by a. Sketch the exponential Fourier spectra. b. By inspection of the spectra in part (a), sketch the trigonometric Fourier spectra for x(t). Find th ...

Objectivesthe objectives of this experiment are1 to

OBJECTIVES: The objectives of this experiment are: 1) To investigate the operation of automatic reset circuits. 2) To understand the difference between a positive edge triggered, negative edge triggered, and a level trig ...

Assignment1 a 1-mhz plane wave is incident from air on an

Assignment 1. A 1-MHz plane wave is incident from air on an infinite copper sheet. If the amplitude of the incident E-field is 100 V/m, find τ, Γ, δ and the magnitude of electric and magnetic fields at a distance of one ...

Assume bob using the rsa cryptosystem selects p 11 q 13

Assume Bob, using the RSA cryptosystem, selects p = 11, q = 13, and d = 7, which of the following can be the value of public key e? a. 11 b. 103 c. 19

Does the velocity distribution in example satisfy

Does the velocity distribution in Example satisfy continuity? Example A rotating shaft, as illustrated in Figure, causes the fluid to move in circular streamlines with a velocity that is inversely proportional to the dis ...

1 a 0635-cm hydraulic line suddenly ruptures 8 m from a

1. A 0.635-cm hydraulic line suddenly ruptures 8 m from a reservoir with a gage pressure of 207 kPa. Compare the laminar and inviscid flow rates from the ruptured line in cubic meters per second. 2. A common type of visc ...

A communication link at a frequency of 30 mhz uses a

A communication link at a frequency of 30 MHz uses a half-wave dipole for the transmitting antenna and a small loop (directivity equal to 1.5) for the receiving antenna, involving a distance of 100 km. The antennas are o ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro