Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

1) A laminated tooth of the armature steel in an electrical machine is 30mm long and has a taper such that maxi. width is 1.4 times the minimum. Determine the E.M.F needed for the mean flux density of 1.9 wb/m2 in this tooth. Use the simpson’s rule. The B. at curve for the material of tooth is
B wb/m2     1. 6        1.8        1.9        2.0        2.1         2.2       2.3

at A/m     3700   10,000   17,000   27,000  41,000  70,000  1,08,000

2) Describe the choice of specific electric loading in the electrical machines.

3) find out the major dimensions, number of poles and the length of the airgap of a 600kw, 500v, 900 rpm generator. Suppose the average gap density as 0.6 wb/m2 35,000. The ratio of pole arc to pole pitch is 0.75 and the efficiency is 91%. The following are the design constraints: peripheral speed 40 m/s, frequency of flux reversals 50 HZ, current per brush arm 400 A > and armature mmf per pole > 7500A. The e.m.f needed  for the air gap is 50% of armature e.m.f. per pole and gap contraction factor is 1.15.

4) The commutator of the 50 rpm machine is 0.3m in diameter. The brush friction loss is 100 w. If at full load the commutator loss is twice the brush friction loss, determine the length of commutator that will give the final temperature rise of 40°C. Suppose that the commutator of this diameter and 75mm in length running at 700 rpm provides the temperature length running at 700 rpm provides a temperature rise of 40°C with the commutator loss of 300W.

5) Find the dimensions for core and yoke for a 5KVA, single phase core type transformer. A rectangular core is used with long side twice as long side twice as long as short side. The window height is 3 times the width. Voltage per turn is 1.8 V. Space factor 0.2, current density 1.8 A/mm2

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M913083

Have any Question? 


Related Questions in Electrical & Electronics

Give examples of numerical problems in network analysis

Give examples of numerical problems in network analysis with solutions and justification where, (1) Superposition theorem may be more useful than mesh/nodal analysis (2) The use of Thevenin's/Norton's equivalent circuit ...

1 discuss the solutions for the transmission-line equations

1. Discuss the solutions for the transmission-line equations in frequency domain. 2. Discuss the propagation constant and characteristic impedance associated with wave propagation on transmission lines. 3. What is the bo ...

1 if the plate shown is inclined at an angle as shown what

1. If the plate shown is inclined at an angle as shown, what are the forces F x  and F y  necessary to maintain its position? The flow is frictionless. 2. A steady, incompressible, frictionless, two-dimensional jet of fl ...

1 how is the magnetic flux density defined in terms of

1. How is the magnetic flux density defined in terms of force on a current element? 2. How is the magnetic flux density defined in terms of force on a moving charge? 3. What are the units of the magnetic flux density? 4. ...

1 for the force field f x2ay find the approximate value of

1. For the force field F = x 2 ay, find the approximate value of the line integral of F from the origin to the point (1, 3, 0) along a straight line path by dividing the path into ten equal segments. 2. For the force fie ...

A square plane-strain element is deformed as shown in the

A square plane-strain element is deformed as shown in the figure. The relationship between deformed and undeformed coordinates is given as x 1 = X 1 - αX 1 X 2 , x 2 = X 2 , x 3 = X 3 Compare the engineering strain and L ...

Assignment projecttitle design of control

Assignment: Project Title: Design of Control Systems Problem: Design a closed-loop controller for a servo system (motor) with tachometer feedback. The output; c(t), corresponds to the position of the motor, while the tac ...

The rate of shear work per unit volume is given by the

The rate of shear work per unit volume is given by the product tv. For a parabolic velocity profile in a circular tube (see given Example), determine the distance from the wall at which the shear work is maximum. Example ...

1 discuss with the aid of an example the discharging of an

1. Discuss with the aid of an example the discharging of an initially charged line into a resistor. 2. Discuss the bounce-diagram technique of transient analysis of a line with uniform initial voltage and current distrib ...

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 ...

  • 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