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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting
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.
the damper bars develop synchronous motor torque.
Answer
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Related Question
Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be
3.5+j5.8 ohms
53+j85 ohms
3.05+j5.08 ohms
8+j13 ohms
3.5+j5.8 ohms
53+j85 ohms
3.05+j5.08 ohms
8+j13 ohms
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
150 Ω.
145 Ω.
375 Ω.
225 Ω.
150 Ω.
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375 Ω.
225 Ω.
Answer
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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is
0%.
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7%.
0%.
14%.
8.9%.
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Answer
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Electrical Machines
Which of the following motors has negative speed regulation?
Shunt motors.
Series motors.
Differential compound motors.
Both B and C.
Shunt motors.
Series motors.
Differential compound motors.
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Answer
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Electrical Machines
Which of the following represents the pitch factor?
Cos (α/2)
sin (α/2)
Cos α
Cos α²
Cos (α/2)
sin (α/2)
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Answer
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