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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as
DC series motor.
DC shunt generator.
DC series generator.
DC shunt motor.
DC series motor.
DC shunt generator.
DC series generator.
DC shunt motor.
Answer
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Related Question
Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause
negative sequence current.
all of these.
less heating of the rotor.
less heating of the rotor.
negative sequence current.
all of these.
less heating of the rotor.
less heating of the rotor.
Answer
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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?
150 V.
240 V.
230 V.
210 V
150 V.
240 V.
230 V.
210 V
Answer
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Electrical Machines
The armature resistance of the dc motor is generally of the range
100 ohm.
0.5 ohm.
0.1 ohm.
50 ohm.
100 ohm.
0.5 ohm.
0.1 ohm.
50 ohm.
Answer
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Electrical Machines
Poles of DC machine are often laminated to
reduce armature reaction.
dissipate more heat.
reduce pulsation loss.
reduce iron weight.
reduce armature reaction.
dissipate more heat.
reduce pulsation loss.
reduce iron weight.
Answer
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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
5.7 ohms.
6 ohms.
1.9 ohms.
2.2 ohms.
5.7 ohms.
6 ohms.
1.9 ohms.
2.2 ohms.
Answer
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