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Question { 24096 }
ON WHAT BASIS LOADS ARE CLASSIFIED AS RESISTIVE,INDUCTIVE
AND CAPACITIVE LOADS?.GIVE PRACTICAL EXAMPLES FOR EACH
Answer
resistance , inductance eand capacitance is the network
resistive current is in phase with voltage
inductive current is 90 degrree lag with phase voltage
capacitve current is 90 degrree lead with phase volage
if load is inductive more than capacitve , ur power factor
will be lag around o.5 percent then ur loss become maximum
and ur efficiency will reduce , so we need compansate the
KVAR , and connect the shunt capacitor for pf improvement
in capacitve load , more than inductive , transformer give
negative voltage regulation then it not give constant
voltage
that means u have to balnce the three loads ,resistance ,
inductive , capacitve
| Is This Answer Correct ? | 14 Yes | 0 No |
Question { 6416 }
how induction generator works?
Answer
in between stator , rotor rotates and cut the magentic
field by 0 ,120,240 degree it produces dC
current ,commutator is convert the dc into ac ,and we get
ac
generator is for generate ac current
| Is This Answer Correct ? | 1 Yes | 4 No |
Question { 3908 }
when we connect a CT in the line will there be any loses in
the line due to the mutual inductance of the CT.
Answer
because CT is current transformer ,
why we connect a CT in the line ???
for the metering purpose ,
| Is This Answer Correct ? | 3 Yes | 0 No |
Question { 3976 }
what is residual current....
Answer
current , because of electromagnetic effect there is some
small current will be there , its called residual current
| Is This Answer Correct ? | 8 Yes | 0 No |
Question { 18120 }
what happen "when Dyn11 is parallel operation with Dyn1"?
Answer
and because of phase angle difference it shows negative
sequence
| Is This Answer Correct ? | 1 Yes | 0 No |
If current flows through conductor it produce magnetic
field only.but if current flows through vaccum both
magnetic & electrical field produce why ?
Answer
current flows through conductor it produce magnetic field
it is ok
but what current flow through vaccum ??? i don;t understand
this
| Is This Answer Correct ? | 1 Yes | 0 No |
On what basis no of earth pits are to be decided either for
transformers or for equipment?
Answer
on vector group of transformer which we are used
equipment body earthing ,in delta connection we required
earthing transformer to protect from earthfault current
| Is This Answer Correct ? | 1 Yes | 7 No |
Question { 6479 }
why return path in terms of neutral is required please give
a relevant answer
Answer
if ur ckt is not close , ur ckt not works
| Is This Answer Correct ? | 1 Yes | 0 No |
Question { 57009 }
WAT IS MEANT BY COLD AND HOT START OF A MOTOR?? HOW DOES IT
AFFECT A MOTOR'S PERFORMANCE??
Answer
when the first time u start the motor
hot start of a motor means
second start of motor , after first start of motor u stop
the motor and again u start the motor then motor condition
is hot thats why it is known is hot start
prformance ???
when u start at cold condition , motor takes more starting
current for getting in synchronus condition
and in hot condition motor is already hot thats y it's
starting easy then cold
| Is This Answer Correct ? | 16 Yes | 42 No |
Question { 4549 }
what is the different between second harmonics and third
harmonics ?
Answer
Third harmonic component = 3*50 = 150Hz
Second harmonic has low disturbance then third harmonics
| Is This Answer Correct ? | 5 Yes | 1 No |
Question { 4556 }
why are we using resistor in NGR ?
Answer
to limit the earth fault current
| Is This Answer Correct ? | 15 Yes | 0 No |
