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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is
40 V
zero
20 V
50 V
40 V
zero
20 V
50 V
Answer
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Related Question
Electrical Machines
Reactive power generated or delivered significantly depends on
frequency.
load angle.
excitation.
both 1 and 2.
frequency.
load angle.
excitation.
both 1 and 2.
Answer
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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine
both the windings have thin leads
armature winding has thick leads whereas field winding has thin leads
armature winding has thin leads whereas field winding has thick leads
both the windings have thick leads
both the windings have thin leads
armature winding has thick leads whereas field winding has thin leads
armature winding has thin leads whereas field winding has thick leads
both the windings have thick leads
Answer
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Electrical Machines
The power factor of squirrel cage induction motor is
low at light loads only
low at heavy loads only
both A and B
low at rated load only
low at light loads only
low at heavy loads only
both A and B
low at rated load only
Answer
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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is
Zero
Nr
Ns
S.Ns
Zero
Nr
Ns
S.Ns
Answer
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Electrical Machines
A DC series motor has which of the following characteristics?
Has a almost constant speed.
Has a poor torque.
Has its field winding consinting of thick wire and less no of turns.
Can be started easily without load.
Has a almost constant speed.
Has a poor torque.
Has its field winding consinting of thick wire and less no of turns.
Can be started easily without load.
Answer
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