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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?
0.04, 1.96
0.02, 0.98
0.04, 0.96
0.02, 1.98
0.04, 1.96
0.02, 0.98
0.04, 0.96
0.02, 1.98
Answer
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Related Question
Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be
1.2 mWb.
2.7 mWb.
3.5 mWb.
1.4 mWb.
1.2 mWb.
2.7 mWb.
3.5 mWb.
1.4 mWb.
Answer
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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is
100 KVA
123.3 KVA
50 KVA
83.33 KVA
100 KVA
123.3 KVA
50 KVA
83.33 KVA
Answer
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Electrical Machines
The field divertor resistance for a DC series motor is of order of
100 Ω
10 Ω
50 Ω
0.1 Ω
100 Ω
10 Ω
50 Ω
0.1 Ω
Answer
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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?
45.
30.
270.
180.
45.
30.
270.
180.
Answer
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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will
get heated and damaged.
not start at all.
rotate in direction opposite to that before maintenance.
rotate in the same direction as before maintenance.
get heated and damaged.
not start at all.
rotate in direction opposite to that before maintenance.
rotate in the same direction as before maintenance.
Answer
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