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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be
about 50 V.
220 V.
zero.
about 2 V.
about 50 V.
220 V.
zero.
about 2 V.
Answer
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Related Question
Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?
200 MW and 400MW respectively
230.7 MW and 369.23 MW respectively
generator 2 gets over load
generator 1 gets over load
200 MW and 400MW respectively
230.7 MW and 369.23 MW respectively
generator 2 gets over load
generator 1 gets over load
Answer
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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by
using transformer oil of better quality.
using soft material for winding.
using the magnetic core of low reluctance.
increasing the number of turns.
using transformer oil of better quality.
using soft material for winding.
using the magnetic core of low reluctance.
increasing the number of turns.
Answer
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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up
more than 220 V
6 V
220 V
somewhat less than 220 V
more than 220 V
6 V
220 V
somewhat less than 220 V
Answer
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Electrical Machines
Rotating magnetic field is produced in an induction motor because of
rotor winding.
either stator winding or rotor winding.
stator winding.
None of these
rotor winding.
either stator winding or rotor winding.
stator winding.
None of these
Answer
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Electrical Machines
An inverted V curve of synchronous motor shows variation of
supply voltage and field current at constant excitation.
power factor and supply voltage during hunting.
power factor and DC excitation at constant load.
supply voltage and excitation current at constant load.
supply voltage and field current at constant excitation.
power factor and supply voltage during hunting.
power factor and DC excitation at constant load.
supply voltage and excitation current at constant load.
Answer
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