Ask Question, Ask an Expert


Ask Electrical & Electronics Expert

1) prepare down the energy balance equation of a motor.

2) What is the energy conversion medium in the singly-excited magnetic field system?

3) A100 kVA, 6.6kV/415V, single phase transformer has the effective impedance of (3+8j) _ referred to HV side. Evaluate full load voltage regulation at 0.8 pf lagging and 0.8 leading pf.

4)(a) Describe the working of auto transformer and prove that when transformation ratio approaches unity, amount copper used approaches smaller value.

(b) Emf per turn of single phase, 6.6kV/440V, 50 Hz transformer is approximately 12V. Compute the number of turns in HV and LV windings and net cross sectional area of the core for a maximum flux density of 1.5T.

5)(a) Get the equivalent circuit of a 200/400V, 50Hz,single phase transformer from test data given below:

OC test: 200V,0.7A,70W on LV side
SC test: 15V,10A,85W on HV side

(b) With the help of suitable circuit diagrams, describe any two kinds of three phase transformer connections

6) Determine the all day efficiency of a 500kVA, distribution transformer whose iron loss and full load copper loss are 1.5kW and 6kW respectively. In a day it is loaded as follows:

Duration (Hi)   Output(Po) in kW  Power factor(cosØ2)

     6                      400                               0.8
    10                     300                             0.75
     4                      100                               0.8
     4                         0                                 -

7) Design the circuit diagrams for conducting OC and SC tests on single phase transformer. Also describe how efficiency an d voltage regulation can be estimated by these tests.

8) What do you mean by the sumpner’s test? Design the circuit diagram to conduct this test and describe its principle.

9)(a) Deduce the condition for maximum efficiency in the transformer.

(b) A11000/230 V, 150 KVA, 1-phase, 50 Hz transformer has core loss of 1.4Kw and F.L cu loss of 1.6 Kw. Find out:

(i) kVA load for maximum efficiency and value of maximum efficiency at unity p.f

(ii) Efficiency at half F.L 0.8 pf leading

10) Describe in detail about parallel operation of single phase transformers.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M911367

Have any Question? 

Related Questions in Electrical & Electronics

Question 1consider the following wireless receiver chain

Question 1: Consider the following wireless receiver chain consisting of a low noise amplifier (LNA), bandpass filter and mixer, as depicted below. The LNA receives its input signal from an antenna. a) If the input noise ...

1 what is meant by the dominant mode why are waveguides

1. What is meant by the dominant mode? Why are waveguides designed so that they propagate only the dominant mode? 2. Why is the dimension b of a rectangular waveguide generally chosen to be less than or equal to one-half ...

A person receives an automobile loan of 10000 from a bank

A person receives an automobile loan of $10,000 from a bank at the interest rate of 1.5% per month. His monthly payment is $500, with the first payment due one month after he receives the loan. Compute the number of paym ...

A liquid of density rho flows through a sluice gate as

A liquid of density ρ flows through a sluice gate as shown. The upstream and downstream flows are uniform and parallel, so that the pressure variations at stations 1 and 2 may be considered hydrostatic. (a) Determine the ...

1 state the divergence theorem and discuss its application2

1. State the divergence theorem and discuss its application. 2. What is the divergence of the curl of a vector? 3. Summarize Maxwell's equations in differential form. 4. Are all Maxwell's equations in differential form i ...

In communication channels transmitted signal is propagated

In communication channels, transmitted signal is propagated simultaneously by several paths of varying lengths. This causes the signal to reach the destination with varying time delays and varying gains. Such a system ge ...

Consider a simple shear deformation of a square whose

Consider a simple shear deformation of a square whose deformed geometry is given as x 1 = X 1 + αX 2 , x 2 = X 2 , x 3 = X 3 When the material is incompressible and St. Venant-Kirchhoff material properties are given as E ...

1 discuss briefly the motional emf concept2 what is lenzs

1. Discuss briefly the motional emf concept. 2. What is Lenz's law? 3. How would you orient a loop antenna in order to obtain maximum signal from an incident electromagnetic wave which has its magnetic field linearly pol ...

Suppose that a continuous-time system is described by the

Suppose that a continuous-time system is described by the impulse response a. Compute the transfer function of the system. b. Find out if the system is BIBO stable. c. Plot the poles and the zeros of the system. d. Write ...

Answer the following questionsa how many output lines would

Answer the following questions. a. How many output lines would a 4 input decoder have? b. How many output lines would a 5 input decoder have? c. For an N-to-X decoder, specify X as a function of N (e.g. specify the numbe ...

  • 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