Ask Question, Ask an Expert


Ask Electrical & Electronics Expert

1) Data of a 500KVA, 3300/400 V, 50 Hz ,single phase transformer is given below. S.C test: 1250 W, 100 V –secondary short circuited with full load current in it O.C test : 1000 W –with normal primary voltage. Compute the full load regulation and efficiency at a power factor of 0.8(lag).

2)(a) Deduce an equivalent circuit of single phase two winding transformer.

(b) Maximum efficiency of single phase 250kVA,2000/250 V transformer occurs at 80% of full load and is equal to 97.5% at 0.8 pf. Find out the efficiency and regulation on full load at 0.8pf lagging if the impedance of the transformer is 9 percent

3) Describe about tap changing of transformers in detail.

4) prepare down the basic feature of electromagnetic energy conversion devices.

5) Describe why does energy storage in the magnetic material occurs mainly in air gap?

6) What do you mean by multiply excited magnetic field system?

7) prepare down the relation between energy and co-energy for linear system.

8) prepare down the suitable exs for each of single and multiple excited system.

9) prepare down the applications of singly and doubly fedmagnetic systems.

10) Describe why the field in rotating machines must be quasi-static in nature?

11) prepare down the causes for irrecoverable energy loss when flux in magnetic circuit undergoes a cycle.

12) describe why relationship between current and coil flux linkages of electromechanical energy conversion devices are linear

13) In which direction does force act with respect to magnetic field?

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M911368

Have any Question? 

Related Questions in Electrical & Electronics

Diode circuits1 the 6v zener diode below has zero zener

Diode Circuits 1. The 6V zener diode below has zero Zener resistance and a knee current of 5mA.The minimum value of R, so that the voltage across it does not fall below 6V is 2.A zener diode in the circuit shown in below ...

Microelectronics1 what regions are heavily doped n to form

Microelectronics 1. What regions are heavily doped n+ to form ohmic contacts? 2. On the plot to the right. label the horzontal and vertical axis. Indicate the triode and square law regions. The square law region of secon ...

1 in internet telephony explain how a call from alice can

1. In Internet telephony, explain how a call from Alice can be directed to Bob when he could be either in his office or at home? 2. Do you think H.323 is actually the same as SIP? What are the differences? Make a compari ...

Show that if a periodic signal xt is an even function of t

Show that if a periodic signal x(t) is an even function of t, then all the sine terms in its trigonometric Fourier series vanish, and if x(t) is an odd function of t, all the cosine terms vanish. In either case, show tha ...

Election polls oversight a reflection on forecast accuracy

Election Polls Oversight: A reflection on Forecast Accuracy and Bias The media, locally and internationally, has been labeling this Election results as Unexpected, based on early predictions that did not realize. We kept ...

Question 1a 1000-pf capacitor a 1-mh inductor and a current

Question 1: A 1000-pF capacitor, a 1-mH inductor, and a current source of 2 cos 10 6 t mA are in series. The capacitor voltage is zero at t = 0. Find the energy stored (a) in the inductor at t = 0; (b) in the capacitor a ...

Power mosfet breakdown voltage 800v must conduct 10a when

power mosfet breakdown voltage 800v must conduct 10A when on with a maximum on state voltage 4v.If the current density in the mosfet must be limited to 200A/cm,estimate the conduxting area

1 what are the different kinds of magnetic materials2 what

1. What are the different kinds of magnetic materials? 2. What is the magnetization vector? How is it related to the magnetic flux density? 3. Discuss how magnetization current arises in a magnetic material. 4. State the ...

1 if alice and bob need to communicate using asymmetric-key

1. If Alice and Bob need to communicate using asymmetric-key cryptography, how many keys do they need? Who needs to create these keys? 2. Why do you think asymmetric-key cryptography is used only with small messages. 3. ...

1 discuss how the solution for the electromagnetic field

1. Discuss how the solution for the electromagnetic field given by (4.52) corresponds to that of a uniform plane wave. 2. Why is the quantity known as the phase constant? 3. What is phase velocity? How is it related to t ...

  • 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