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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm
1Ω.
0.25Ω.
0.5Ω.
0.23Ω.
1Ω.
0.25Ω.
0.5Ω.
0.23Ω.
Answer
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Related Question
Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is
2.2 ohms.
5.7 ohms.
6 ohms.
1.9 ohms.
2.2 ohms.
5.7 ohms.
6 ohms.
1.9 ohms.
Answer
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Electrical Machines
In case of IM the torque is
directly proportional to slip.
inversely proportional to slip.
inversely proportional to Ã¢Ë†Å¡slip.
directly proportional to slip2.
directly proportional to slip.
inversely proportional to slip.
inversely proportional to Ã¢Ë†Å¡slip.
directly proportional to slip2.
Answer
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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?
Zero
Slip speed
None of these
Synchronous speed
Zero
Slip speed
None of these
Synchronous speed
Answer
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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in
14 HP.
13 HP.
15 HP.
10 HP.
14 HP.
13 HP.
15 HP.
10 HP.
Answer
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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?
Remain unchanged
None of above.
Decreases.
Increases.
Remain unchanged
None of above.
Decreases.
Increases.
Answer
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