Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

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

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 ...

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 ...

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 ...

Givena perform all the necessary tests and determine if

Given (a) Perform all the necessary tests and determine if these fields represent a uniform plane wave propagating in a perfect dielectric medium. (b) Find the permittivity and the permeability of the medium.

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 for flow at very low speeds and with large viscosity the

1. For flow at very low speeds and with large viscosity (the so-called creeping flows) such as occur in lubrication, it is possible to delete the inertia terms, Dv/Dt, from the Navier- Stokes equation. For flows at high ...

Lab 5 multisim1objectivestudents will be introduced to

LAB 5: Multisim 1. Objective Students will be introduced to National Instrument Multisim software for circuit design and analysis. You will conduct a DC operating point analysis simulation and you will use this to verify ...

Assume an image uses a palette of size 8 out of the table

Assume an image uses a palette of size 8 out of the table used by JPEG (GIF uses the same strategy, but the size of the palette is 256), with the combination of the following colors with the indicated level of intensitie ...

1 the dam shown below is 100 m wide determine the magnitude

1. The dam shown below is 100 m wide. Determine the magnitude and location of the force on the inclined surface. 2. The float in a toilet tank is a sphere of radius R and is made of a material with ρ. An upward buoyant f ...

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 ...

  • 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