Calculate generated emf, copper losses and efficiency., Electrical Engineering

Assignment Help:

Q. A shunt generator gives full load output of 30 kW at a terminal voltage of 200V. The armature and field resistance are 0.05? and 50? resp.. The iron and friction losses are 1000 W. Calculate

   (1) generated emf      (2) copper losses    (3) efficiency

Ans.

 

Given

                                V = 200 V, P = 30 × 103 W,Ra = 0.05 W, Rsh = 50 W

 

                             Pi+f = 1000 W

 

                                  I = P/V = 30 × 103/200 = 150 Amp

 

                                 Ish = V/Rsh = 200/50 = 4A

 

                                 Ia = I +Ish = 150 + 4 = 154 Amp

 

       (a)                      E = V + Ia Ra = 200 + 154 × 0.05 = 207.7 volt

 

       (b)                     Copper losses = Ia2 Ra + Iash Rsh

 

                                                        = (154)2 × 0.05 + (4)2 × 50 = 1985.8w

(c)                   Efficiency ? = Output/ Output + Copper losses + iron losses + friction loss 

 

                   = 30 × 103/30 × 103 + 1985.8 + 1000 = 90.95%

 


Related Discussions:- Calculate generated emf, copper losses and efficiency.

Bjt, bias compensation using diode and thermistor

bias compensation using diode and thermistor

Dc machine, why armature lamination notched in outer periphery

why armature lamination notched in outer periphery

Field effect and bipolar junction transistor, Q. What is the difference bet...

Q. What is the difference between field effect transistor and the bipolar junction transistor? The important points of the comparison between the field effect transistor ands t

Explain the three-line cable residential wiring, Q. Explain the three-line ...

Q. Explain the three-line cable Residential wiring? The three-line cable coming out of the secondaries of the distribution transformer on the utility pole passes through the el

Write some notes for the gauss-seidel method, Write Some Notes for the Gaus...

Write Some Notes for the Gauss-Seidel Method? 1.  Equation below is used to calculate the voltage at each busbar in turn, always using the most up to date values for the other

Harmonics, how harmonics shows effect on power systems?

how harmonics shows effect on power systems?

Difference between and and test instructions, Mention how do the AND & T...

Mention how do the AND & TEST instructions differ in their functionality AND: Changes the destination operand while performs the AND operation and. TEST: This ins

Why monitoring and control done, Why Monitoring and control done? Mo...

Why Monitoring and control done? Monitoring and control using microprocessors/computers is often done for the below reasons: - It is safer (faster response to non-standar

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