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Electrical Machines
The output power of a dc motor is given by
EbIa2.
EbIa.
EIa.
none of these.
EbIa2.
EbIa.
EIa.
none of these.
Answer
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Related Question
Electrical Machines
The efficiency of a transformer is mainly dependent on
dielectric losses.
core losses.
copper losses.
stray losses.
dielectric losses.
core losses.
copper losses.
stray losses.
Answer
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Electrical Machines
At stand still condition the value of slip is
0
1
finite value
infinite value
0
1
finite value
infinite value
Answer
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Electrical Machines
Which machine is used for battery charging?
None of these.
DC series generator.
DC shunt generator.
Compounded DC generator.
None of these.
DC series generator.
DC shunt generator.
Compounded DC generator.
Answer
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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is
375 Ω.
150 Ω.
225 Ω.
145 Ω.
375 Ω.
150 Ω.
225 Ω.
145 Ω.
Answer
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Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are
2, 4 ,5
2, 3 , 5
1, 4
1, 3, 5
2, 4 ,5
2, 3 , 5
1, 4
1, 3, 5
Answer
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