1. If we apply dc supply to the
primary winding
of transformer it will be burnt out.
similarly dc
supply is given to field winding of
syn. motor
and armature winding of dc motor,
they are
safe. (Remember both windings
inductive nature) what is the reason
behind that?
Answer Posted / r.durgaprasad
dc motor is protected by back emf
and syn.
motor is protected by self induced
emf. ( for
low voltage of dc supply transformer
is also safe
because there is also self induced
emf is
produced )
| Is This Answer Correct ? | 2 Yes | 5 No |
Post New Answer View All Answers
How to calculate approximate load loss of a distribution transformer by knowing %ge imp of transformer?
Why synchronous motor is used in power factor improvement,dc series in lift
is the value of inductance depends upon the value of thitha in doubly excited machine??
which type of amplifiers are used in multimete?
Help need in transformer !? Hello Friends The parameters of 2300/230 v 50hz t/f is R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm Secondary Load impedance ZL=0.387+J0.29 solve the exact equivalent circuit with normal voltage across primery.. I know every thing but i cant find CURRENT I1=? and I`2=? Please help me give solution or only Formula please please...
what are the effects when a salient pole alternator is run at high speed like 3000 r.p.m?
How to select circuit breakers rating eg. if i select a circuit breakers of capacity 40 amps DC with operating voltage 28 volts and if i what to use same circuit breakers for 300 Volts DC application what is the current rating of this circuit breakers.
one conductor length is L.and i am strech uniformly this conductor and made length is 2L.so resistance of this strech conductor is R=4R..but i want to know about area of stech conductor hows it become a/2..
what is the criterion for selecting vector group of Transformers ? i mean how to decide vector group of Generator transformer, substation trasformer and transformer at consumer end
How many types of faults are there in 3 phase power system?
How should i design a 1ph & 3 ph transformer. Kindly let meknow all steps and formulaes related to design from scratch.
what is the VA(Volt-amphere)? define with calculation?
Where burned of electricity,when,who, & why.
why we use sinosidal voltage / current instead of others in system?
Which type of questions well asked. ?