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Electrical Machines
Dynamic braking is employed to brake
non reversing drive
reversing drive
both 1 and 2
None of these
non reversing drive
reversing drive
both 1 and 2
None of these
Answer
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Related Question
Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will
Develop excessive speed and damage itself.
Produce sparking at brushes.
Open fuse or circuit breaker.
Draw too much current.
Develop excessive speed and damage itself.
Produce sparking at brushes.
Open fuse or circuit breaker.
Draw too much current.
Answer
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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be
15.28 Nm
15.6 Nm
16.55 Nm
15.92 Nm
15.28 Nm
15.6 Nm
16.55 Nm
15.92 Nm
Answer
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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?
2 point starter
3 point starter
All of these
4 point starter
2 point starter
3 point starter
All of these
4 point starter
Answer
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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting
the damper bars develop synchronous motor torque.
the damper bars develop induction generator torque.
the damper bars develop induction motor torque.
negative sequence currents are generated.
the damper bars develop synchronous motor torque.
the damper bars develop induction generator torque.
the damper bars develop induction motor torque.
negative sequence currents are generated.
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
50 KVA
83.33 KVA
123.3 KVA
100 KVA
50 KVA
83.33 KVA
123.3 KVA
100 KVA
Answer
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