Answer Posted / ann
For DC machine
when when we energize rotor of the machine .flux is produce this flux is static flux ... when the rotor of the dc machine rotors the flux cuts the stator winding according to Faraday's law a produced emf is produced which cancelled the effect of original emf .the emf is called back emf which oppose the effect of original emf
For ac machines,
both parts of machine are rotating .. when we energize the rotor of synchronous machine with dc supply a rotating emf is induce which cuts the winding of stator in the result back emf induce
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
i m in need of current rating chart of heavy duty pvc/xlpe, cu/al cables. can somebody provide me? if yes, plz send me at ashish_patel111@yahoo.com
in what type of applications v can use q meter?
What is vacuum circuit breaker.define with cause and where be use it device?
how to find the multiplication factor for digital energy meter and analog energy meter
What is the difference between type1 and type2 relay protection co-ordination for motor feeders
what is rating boiler
How can we calculate strength of copper hich is supplying electric power to heater and in it hold the heater also and what r all types of forces which is acting on it...
A 230V dc shunt wound motor has an armature resistance of 0,15Ω.When operating on no load at 650 rev/min the armature current is 6A . The motor takes a full load current of 85A. Calculate the full load speed if the field flux is (i) maintained constant (ii)reduced by 0,03
What the main causes of transient interruptions on Over-Head Distribution Lines?
Why does inductive loads consume KVARs?
Types of test in Switchgears, MCC, NGR and DB's how it should be procced. Can anyone give me the details here or email me to pasuvaraj.k@gmail.com
Is there any Electrical supervisor license which gives permit to work whole India rather than individual state??
For refrigerators the motor current is raised beyond its rating on both conditions when the voltage of the system is more(say 270v) than the rated voltage(220v) as well as when the voltage of system is less(say 160v) than normal voltageof 220v, why explain?
Diagram and details of polarity test for Current Transformer 11kv 400/200/100/1A
Electrical Engineering
