Find the total emf and armature current., Electrical Engineering

Q. In a 110V compound generator, the armature, shunt and series winding resistance are 0.06?, 25? and 0.04? respectively. The load consists of 200 lamps each rated 55W, 110V connected on parallel. Find the total emf and armature current, when the machines is conducted for

(i)Long shunt

(ii)Short shunt

Ignore the armature and brush drop.

Ans. 

 

                  Given      Ra = 0.06?, Rsh = 25?, Rsc = 0.04?

 

                                   II = 200 × 55/110 = 100 Amp

 

 (i) For long shunt

 

 

                                   If = 110/25 = 4.4 Amp

 

                                   Ia = Ic + If = 100 + 4.4 = 104.4 Amp

 

                                   Ea = V + Ia (Ra + Rsc)

 

                                        = 110 + 104.4 (0.06 + 0.04) = 120.4 volt

 

 (ii) For short shunt

 

 

                                   Va = V + ILRsc = 110 + 100 × 0.04

 

                                    Va = 114 Volt

 

                                    If = V/Rf

 

                                    If = 114/25

 

                                    If = 4.56 Amp

 

                                    Ia = IL + If  = 100 + 4.56 = 104.56 Amp

 

                                    Ea = Va + Ia + Ra

 

                                         = 114 + 104.56 × 0.06 = 120.03 volt

 

(iii) Now with diverter

 

 

                                    IdSe = 104.4 × 0.1/0.14 = 74.57 Amp

 

                                    ISc = Ia = 104.4 Amp

 

                       Series field Ar reduce to

 

                                    = 74.57/104.4 × 100 = 71.4%                                             

Posted Date: 7/23/2012 1:33:04 AM | Location : United States







Related Discussions:- Find the total emf and armature current., Assignment Help, Ask Question on Find the total emf and armature current., Get Answer, Expert's Help, Find the total emf and armature current. Discussions

Write discussion on Find the total emf and armature current.
Your posts are moderated
Related Questions
Find the resonant frequency: Find the resonant frequency ω0 (or f0) for the given series RLC circuit v = Vm sin ωt = 50 sin ωt Figure Also determine the expre

Q. A 230-V, single-phase, 60-Hz source supplies two loads in parallel. One draws 10 kVA at a lagging power factor of 0.80 and the other draws 6 kWat a lagging power factor of 0.90.

Name  the flag bits available in 8085 microprocessors. The 8085 microprocessor has five flags to show  five different  types  of data conditions .they are zero(Z),carry(CY),Sig

General  Purpose  Registers Registers B, C ,D, E H , and L   are 8 bit  general  purpose  registers. These  registers store  8 bit  data  temporarily  for processing. Some

Synchronization:  Whatever type of weep is used, it must be synchronized with the signal being measured. Synchronization has to be done to obtain a stationary pattern. This requir

First section Aim: the aim of this project is to produce a storage scope using a PIC. In this project, several samples were taken from an analog signal and stored in the memo

Q. Obtain a block diagram of a shift-left/right register using D flip-flops. Q. Design a 4-bit universal shift register. Q. (a) Show a block diagram of an SRFF connected to s

what are accidents in an organisation

Draw a diagram of ultrasonic Machine and illustrate its important parts? Discuss the following important element of ultrasonic process. (i) Abrasive slurry. (ii) Work Mate

Define Lines Parameters In power system analysis, the parameters of interest when modelling power lines are:  inductance, capacitance, series resistance and leakage resistance.