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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?
74
37
36
72
74
37
36
72
Answer
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Related Question
Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is
0.01 pu.
0.08 pu.
0.16 pu.
0.02 pu.
0.01 pu.
0.08 pu.
0.16 pu.
0.02 pu.
Answer
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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.
30 volts.
20 volts.
40 volts.
10 volts.
30 volts.
20 volts.
40 volts.
10 volts.
Answer
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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be
0.06 Ω.
0.54 Ω.
0.01 Ω.
0.54 Ω.
0.06 Ω.
0.54 Ω.
0.01 Ω.
0.54 Ω.
Answer
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Electrical Machines
In most condition which frame of motor will be preferred?
Splash proof.
Open type.
Totally enclosed fan coiled.
Drip proof.
Splash proof.
Open type.
Totally enclosed fan coiled.
Drip proof.
Answer
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Electrical Machines
DC machine windings are
short pitched
None of these
either of these
full pitched
short pitched
None of these
either of these
full pitched
Answer
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