Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

1) Describe the two reaction theory applicable to the salient pole synchronous alternators. Describe the slip test for determining the Xd and Xq.

2) find out the synchronous impedance and reactance of an alternator in which the given field current generates an armature current of 200 A on short circuit and a generated E.M.F of 50 V on open circuit. The armature resistance is 0.1 ohm. To what induced voltage must the alternator be excited if it is to deliver a load of 100 A at the PF of 0.8 lagging, with a terminal voltage of 200 V.

3) a) Sketch and describe the V curve and Inverted V curves of a synchronous motor.

b) Describe the working principle of three phase synchronous motor.

4) a) A 500, 1 Phase synchronous motor provides a net output mechanical power of 7.46 KW and operates at the 0.9 pf lagging. Its effective resistance is 0.8 ohm. If the iron and friction losses are 500 W and excitation losses are 800 W, estimate the armature current. Determine the commercial efficiency.

b) A 75 KW,3 phase star connected ,50 Hz ,440v cylindrical rotor synchronous motor operates at rated condition with 0.8 pf leading. The motor efficiency excluding field and stator losses, is 95% and Xs =2.5 ohm. Determine

a) Mechanical power developed

b) Armature current

c) Back E.M.F

d) Power angle

e) Maximum or pull out torque of the motor.

5) Describe the construction, types and the rotating magnetic principle of 3 phase Induction motor.

6) Sketch the circle diagram for the 5.6 KW, 400V, 3 phase, 4 pole, and 50HZ slip ring induction motor from the following data:

Number of load test: 400 V, 6A, cos φ0=0.087.

Short circuit test: 100V, 12A, 720W.

The ratio of primary to secondary terms is 2.62.Stator resistanceper phase is 0.67 OHM and that of the rotor is 0.185 OHM. find out

a) The full load current

b) Full load slip

c) Full load power factor

d) Maximum power and

e)Maximum Torque.

7) Describe with neat sketches the double field revolving theory for single phase induction motor.

8) describe the construction and principle of operation of 1 phase series motor and Universal motor with labelled diagram.

9) Describe the construction and principle of the operation of permanent magnetic synchronous motor.

10) Draw the speed torque characteristics and phasor diagrams of the permanent magnetic synchronous motor and describe.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M913044

Have any Question? 


Related Questions in Electrical & Electronics

1 explain why private-public keys cannot be used in

1. Explain why private-public keys cannot be used in creating a MAC. 2. The nonce in Figure 31.22 is to prevent a replay of the third message. Eve cannot replay the third message and pretend that it is a new request from ...

1 what are the two types of firewalls2 what is a vpn and

1. What are the two types of firewalls? 2. What is a VPN and why is it needed? 3. How do LANs on a fully private internet communicate? 4. Host A and host B use IPSec in the transport mode. Can we say that the two hosts n ...

1 state faradays law in differential form for the general

1. State Faraday's law in differential form for the general case of an arbitrary electric field. How is it derived from its integral form? 2. What is meant by the net right-lateral differential of the x- and y-components ...

1 in kademlia assume m 4 and active nodes are n4 n7 and

1. In Kademlia, assume m = 4 and active nodes are N4, N7, and N12. Where is the key k3 stored in this system? 2. In Chord, assume the size of the identifier space is 16. The active nodes are N3, N6, N8, and N12. Show the ...

Problem 1 - a consider an isolated generating station with

Problem 1 - a. Consider an isolated generating station with a local load and with: Governor time constant and gain T G = 0, K G = 1, Turbine time constant and gain T T = 1, K T = 1 System time constant T P = 20 Total dam ...

Each round in a block cipher should be invertible to make

Each round in a block cipher should be invertible to make the whole block invertible. Modern block ciphers use two approaches to achieve this. In the first approach, each component is invertible; in the second approach s ...

1 how do you find the work done in moving a test charge by

1. How do you find the work done in moving a test charge by an infinitesimal distance in an electric field? 2. What is the amount of work involved in moving a test charge normal to the electric field? 3. What is the phys ...

1 what would be the voltage and current standing wave

1. What would be the voltage and current standing wave patterns for an open-circuited line? 2. Discuss the variation with frequency of the input reactance of a short-circuited line and its application in the determinatio ...

Given the message aacccbccddab in which the probabilities

Given the message "AACCCBCCDDAB", in which the probabilities of symbols are P(A) = 0.50, P(B) = 0.25, P(C) = 0.125, and P(D) = 0.125, a. encode the data using Huffman coding. b. find the compression ratio if each origina ...

The grades of a group of 1000 students in an exam are

The grades of a group of 1000 students in an exam are normally distributed with a mean of 70 and a standard deviation of 10. A student from this group is selected randomly. a) Find the probability that his/her grade is g ...

  • 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