GURU TECHNICAL CLASSES KOTA RAJASTHAN
Contact : Ajay Gahlot 7733052211, 9672502497
Important Diploma Electrical Questions
3
Q:1 What is effect of
capitance in transmission line? 2. After raising the voltage at receiving end
what will be happen? 3.how we nullify or control the raised voltage at
receiving end?
Answer: it is
ferranti effect. the voltage at the receiving end is higher than the sending
end. in order to control ferranti effect SHUNT REACTOR is place in the transmission
line.
Q: 2 what is the
importance of reactive power in power generation. if it is zero means wat will
happen to system.
Answer:
Electrical machines work on the principle of conversion of
electromagnetic energy. A part of input energy is consumed for creating
and maintaining the magneticfield.This part of the input energy cannot be
converted into active energy and is returned to the electrical network on
removal of the magnetic field. This power is known as “reactive” power Q.
The Q Power flows back and forth, causing 90º Out of phase shift between
the current and voltage waveform.This
Reactive Power has one half of the Power In the positive area and the other
half in the negative area.Unlike true power, reactive power is not useful power because
it is stored in the circuit itself. This power is stored by
1)Inductors, Because they expand and collapse their magnetic fields in an attempt to keep current constant, 2) Capacitors,Because they charge and discharge in an attempt to keep voltage constant. If it is zero than electromagnetic conversion not possible.
1)Inductors, Because they expand and collapse their magnetic fields in an attempt to keep current constant, 2) Capacitors,Because they charge and discharge in an attempt to keep voltage constant. If it is zero than electromagnetic conversion not possible.
Q: 3 what is CRGO
Transformers?
Answer: CRGO Transformers:- are the transfomrer in which the core material
used is "Cold Rolled Grain Oriented " Steel. CRGO steel core is
having less hysteresis losses therefore the efficiency is high as
compared to normal core transformer.
Q:4 why fuse is not
used in neutral?
Answer: Fuse is used to protect
the equipment from abnormal condition, equipment or load is always
connectected before the nuetral point,flow of current is from phase to
neutral,
so there will be no use to connect the fuse on the nuetral side. nuetral side current value is zero.
so there will be no use to connect the fuse on the nuetral side. nuetral side current value is zero.
Q:5 Do you know the
overhauling of a motor?
Answer:
overhauling of motor means just shutting down but the purpose is to do
some maintenance and repairing of motor parts and changing the parts if required
to incresing the efficiency.
Ajay
Gahlot
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