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.

Difference, Difference between bootstrip sweep circuit and Miller sweep ci...

Difference between bootstrip sweep circuit and Miller sweep circuit

Diode schematic symbol, Diode Schematic Symbol The diode in figure is ...

Diode Schematic Symbol The diode in figure is a unidirectional device. Electron current just only flows in one direction, against the arrow, corresponding to forward bias. The

Power electronics, A step-down transformer has primary turns Np = 100; seco...

A step-down transformer has primary turns Np = 100; secondary turns Ns = 10; primary winding resistanceRp = 100 ?; secondary winding resistance Rs = 2 ?. Assume that there is no l

Bad effects of armature reactions, Q.  What is meant by armature reaction....

Q.  What is meant by armature reaction. Explain briefly the bad effects of armature reactions.   Sol. By armature reaction is meant the effect of magnetic field set up

Compute the motor speed, Consider the 220-V, 1800-r/min dc motor, controlle...

Consider the 220-V, 1800-r/min dc motor, controlled by a three-phase fully controlled rectifier from a 60-Hz ac source. The armature-circuit resistance and inductance are 1.5  and

Determine the line-to-line voltage, Q. A one-line diagram of a three-phase ...

Q. A one-line diagram of a three-phase distribution system is given in Figure. Determine the line-to-line voltage at the sending end of the high-voltage feeder when the transformer

inverters- recifiers and inverters, Inverters Inverter is a device w...

Inverters Inverter is a device which  converts dc power into ac  power at desired output voltage and frequency. Inverters are used in  uninterruptible power  supply  hvdc  tra

Show the frequency response of rc coupled amplifier, Q. Show the Frequency ...

Q. Show the Frequency response of Rc Coupled Amplifier? 1. At low frequency i.e,less than 50 Hz reactance of Cc is going high hence same part of the signal will pass from one s

Explain hexadecimal number system, Q. Explain Hexadecimal Number System? ...

Q. Explain Hexadecimal Number System? A Hexadecimal Number System: uses base 16 includes only the digits 0 through 9 and the letters A, B, C, D, E, and F In the Hexade

Digital electronics, A universal shift register can shift in both the left-...

A universal shift register can shift in both the left-to-right and right-to-left directions, and it has parallel-load capability. Draw a circuit for such a shift register.

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