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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be
increased by 10%
reduced by 20%
reduced by 10%
increased by 20%
increased by 10%
reduced by 20%
reduced by 10%
increased by 20%
Answer
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Related Question
Electrical Machines
The synchronous reactance( Xs) is the
reactance due to leakage flux
reactance due to armature reaction of the machine
reactance either due to armature reaction or leakage flux
combined reactance due to armature reaction and leakage flux
reactance due to leakage flux
reactance due to armature reaction of the machine
reactance either due to armature reaction or leakage flux
combined reactance due to armature reaction and leakage flux
Answer
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Electrical Machines
Capacitor start capacitor run provides
high power factor only.
high staring torque only.
none.
high staring torque and high power factor.
high power factor only.
high staring torque only.
none.
high staring torque and high power factor.
Answer
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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be
2.241 Ω.
2.74 Ω.
2.781 Ω.
25.564 Ω.
2.241 Ω.
2.74 Ω.
2.781 Ω.
25.564 Ω.
Answer
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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?
2 V
1 V
0 V
4 V
2 V
1 V
0 V
4 V
Answer
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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is
interpole winding
armature winding
interpole and compensating windings together
field winding
interpole winding
armature winding
interpole and compensating windings together
field winding
Answer
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