Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Derive the expression for generated emf in a dc generator.
Ans.
Expression for Generated emf in a DC Generator
We shall now derive an expression for the emf generated in a d.c. generator.
Let Φ = flux/pole in Wb
Z = total no. of armature conductors
P = no. of poles
A = no. of parallel paths = 2......for wave winding
= P....for lap winding
N = speed of armature in r.p.m.
Eg = e.m.f. of the generator = e.m.f./parallel path
Flux cut by one conductor in one revolution of the armature, dΦ = pΦ webers
Time taken to complete one revolution,
dt = 60/n sec.
e.m.f. generated/conductor dΦ/dt = PΦ/60/N = PΦN/60 volts
e.m.f. generator, Eg = e.m.f. per parallel path
= (e.m.f/conductor) × No. of conductor in series per parallel path
= PΦN/60 × Z/A
Eg = PΦZN/60A
A = Z...for wave winding
Stator Voltage Control Methods By controlling the applied voltage the speed of an induction motor can be controlled. Since the output torque of 3-? induction motor i
The programming Model of 8085 Microprocessor The programming model of 8085 microprocessor is shown in figure below in this model various 8 bit and 16 bit registers a
Draw and explain the circuit of feedback amplifier
Q. Explain Internal Data Bus? Internal Data Bus: A bus which operates only within internal circuitry of the CPU, communicating among internal caches of memory which are part of
Q. Why FET is a voltage sensitive device explain from the drain characteristics? The JFET consists of a thin layer of n-type material with two ohmic contacts,the source S and t
There are two practical ways of improving commutation i.e. of making current reversal in the short - circuited coil as sparkless as possible. These methods are known as (i) resista
explain how can you find hysteresis loss from hysteresis loop
12. A capacitor is to be constructed so that its capacitance is 0.2µF and to take a p.d. of 1.25kV across its terminals. The dielectric is to be mica which, after allowing a safety
How you write this number in letters. 20,000.000.000
Q. Why do we cascade amplifiers? Why is RC coupling the most widely used coupling between 2 stages of a cascading amplifier? The voltage or power gain or frequency response obt
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd