Example numerical of dc generator., Electrical Engineering

Assignment Help:

Q. An 8 - pole dc generator has 500 armature conductors and has a useful flux per pole of 0.065 web. What will be the emf generated if it is lap connected and runs at 1000 r.p.m.  What must be the speed at which it is to be driven to produce the same emf if it is wave wound?  

Ans.

E1   = N1PΦZ/60A = 10000 × 0.065 ×500 ×  P/A

               For lap connection A = P

 

                       E1  =  10000 × 0.065 ×500 /60 = 541.67 volts

 

                       E2  = N28ΦZ/60 × 2

 

 Since                  E2  = E1

 

                             8N2ΦZ/60 × 2 = 8N1ΦZ/60 × 8

 

                       N2 = N1 × 2/8 = 1000 × 2/8 = 250 rpm


Related Discussions:- Example numerical of dc generator.

Sketch the spectrum of a standard am signal, If the message has a spectrum ...

If the message has a spectrum where K and Wf are positive constants, sketch the spectrum of a standard AM signal that uses the message. Comment on the physical signi?cance

Draw the energy diagram of a pn junction, Question: a). Draw the energy...

Question: a). Draw the energy diagram of a pn junction: (i) at thermal equilibrium, (ii) when a forward bias with magnitude half the built in potential (V = φk/2) is applie

Consequent effects on the real and reactive power losses, Q. Consider an up...

Q. Consider an upgrade of a three-phase transmission system in which the operating line-to-line voltage is doubled, and the phase or line currents are reduced to one-half the previ

Explain contact resistance, Explain Contact resistance. Contact resista...

Explain Contact resistance. Contact resistance: It is measured as the voltage drop from tail to tail of the mated contacts along with specified current flowing through the cont

Explain working of ring topology, Q. Explain working of Ring Topology? ...

Q. Explain working of Ring Topology? Ring Topology: In ring topology, all user nodes are connected with physical path acting as links of a chain and last user node is co

Histograms or bar chart - quality tools for improvement, Histograms or Bar ...

Histograms or Bar Chart - Quality Tools for Improvement Histograms give an easy, graphical view of accumulated data. It provides the simplest way to evaluate the distributio

What is meant by polling, What is meant by polling? Polling or device p...

What is meant by polling? Polling or device polling is a process which recognizes the device that has interrupted the microprocessor.

Determine frequency of rotor current, A 3 phase, 6 pole induction motor is ...

A 3 phase, 6 pole induction motor is rated at 400hz, 150v, 10h.p., 3% slip at rated power output. The windage and friction loss is 200w at rated speed. With the motor operating at

Schottky diodes - types of power diodes , Schottky  diodes The schot...

Schottky  diodes The schottky diodes have very fast recovery time and  low forward drop.  The current  ratings of  these diodes  vary  from 1A to 300 a and  maximum  allowable

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd