Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

1) a) prepare down the comparisons of the electric circuits and magnetic circuits.

b) Also describe the factors that are need to be considered for selecting the specific electric loading and specific magnetic loading?

2) A 15 kW, 230 volt, 4 pole dc machine has the following data:
Armature diameter = 0.25 m, armature core length = 0.125 m, length of the air gap at the pole centre=2.5mm, flux per pole=11.7 mWb, ratio of pole arc to pole pitch=0.66. Determine the e.m.f needed for the air gap.

a) If armature surface is considered as smooth and

b) If armature is slotted.

3) Determine the chief dimensions of the 200 kW, 250 volt, 6 pole, 1000 rpm generator. The maximum value of flux density within the air gap is 0.87 Wb/m2 periphery are 31000. The ratio of the pole arc to pole pitch is 0.67 and the efficiency is 91 percent. Suppose the ratio of length of core to pole pitch = 0.75.

4) A 4 pole,25 HP,500 Volt,600 rpm series motor has the efficiency of 82%. The pole faces are square and the ratio of pole arc to pole pitch is 0.67. Consider Bav=0.55 Wb/m2. Find the major dimensions of the core and particulars of a appropriate armature winding.

5) a) Deduce the expression for the output equation of a 3 phase transformer?

b) find out the dimensions of the core and window for a 5 kVA, 50 Hz,1 phase, core type transformer. A rectangular core is used with the long side twice as long as short side. The window height is 3 times the width. Voltage per turn=1.8 Volt, Space factor=0.2, current density=1.8 A/mm2 and the ampere conductors per metre of the armature, Bm=1 Wb/m2.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M913282

Have any Question? 


Related Questions in Electrical & Electronics

1 describe the phasor technique of solving a differential

1. Describe the phasor technique of solving a differential equation for the sinusoidal steady-state solution. 2. State Coulomb's law. To what law in mechanics is Coulomb's law analogous? 3. What is the definition of 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. ...

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 ...

Let xt be a signal whose fourier transform xomega is

Let x(t) be a signal whose Fourier transform X(ω) is nonzero only over 3 ≤ |ω| ≤ 9. Further, only frequencies 5 ≤ |ω| ≤ 7 contain useful information (the other frequencies can be considered to contain noise or different ...

The electric and magnetic fields of a uniform plane wave

The electric and magnetic fields of a uniform plane wave propagating in a perfect dielectric medium are given by Find the permittivity and the permeability of the medium.

1 why is it necessary to have the displacement current term

1. Why is it necessary to have the displacement current term on the right side of Ampere's circuital law? 2.28. When can you say that the current in a wire enclosed by a closed path is uniquely defined? Give two examples ...

1 show that the radiation fields given by equations 925a

1. Show that the radiation fields given by equations (9.25a) and (9.25b) do not by themselves satisfy both of Maxwell's curl equations. 2. Find the value of r at which the amplitude of the radiation field term in equatio ...

1 what is the directivity of a fictitious antenna that

1. What is the directivity of a fictitious antenna that radiates equally in all directions into one hemisphere? 2. How do you find the radiation fields due to an antenna of arbitrary length and arbitrary current distribu ...

Calculate the approximate diameter and length of stator

Calculate the approximate diameter and length of stator core, the number of stator slots and the number of conductors for a 20KW,400V,3 phase,4pole,1200rpm,delta connected induction motor. Bav=0.5T, Kw=0.82, ac=26000amp. ...

If the hertzian dipole in figure 919 is situated at a

If the Hertzian dipole in Figure 9.19 is situated at a distance from the corner and equidistant from the two planes, find the ratio of the radiation field at a point broadside to the dipole and away from the corner to th ...

  • 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

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

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen