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
Q. Explain about Direct-current machines? Generally speaking, conventional dc generators are becoming obsolete and increasingly often are being replaced by solid-state rectifie
Light Triggering When light is thrown on silicon the hole electron pair get excited an increases hence the leakage current of J 2 increases which will increase I C1 a
Q. The model of an elemental length of a lossy transmission line is shown in Figure (a), along with its parameters, where R is series resistance per unit length, L is serie
Ask qu1. If the resistor Radj is adjusted to 175O what is the rotational speed of the motor at no-load conditions? 2. Assuming no armature reaction, what is the speed of the motor
The vectors we will use we be refered to right-handed Cartesian axes. Right handed means that the x,y,z axes are oriented in a particular way (which you must know). See diagrams
Classification of Feedback Control Systems by Control Action A more common means of describing industrial and process controllers is by the way in which the error signal E(s) i
DESIGN A MOD-6 ASYNCHRONOUS COUNTER
Most ac generators used in Power Stations are of the " Flux Cutting " types. Their effiencies range from less than 33% to slightly more than 60%. In their efficiency equations, the
The observations from these experiments led to 'The Laws of Electromagnetic Induction' 1) 'If the magnetic flux threading through an electrical circuit changes, then an e.m.f.
A moving coil galvanometer consists of a coil in a uniform magnetic field B o, suspended fro a fibre of torque constant C, current I produces a deflection O=nAB o i/c where n is
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