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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at
1500 rpm
zero speed
750rpm
1000 rpm
1500 rpm
zero speed
750rpm
1000 rpm
Answer
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Related Question
Electrical Machines
Sparkless commutation can be achieved by employing
inter poles.
high resistance carbon brushes.
compensating winding.
any one or more of the above methods.
inter poles.
high resistance carbon brushes.
compensating winding.
any one or more of the above methods.
Answer
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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is
R1 /K
K×R1
R1 /K²
K²R1
R1 /K
K×R1
R1 /K²
K²R1
Answer
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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :
1 and 3
1 and 2
1, 2 and 3
2 and 3
1 and 3
1 and 2
1, 2 and 3
2 and 3
Answer
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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be
oscillating
None of these
steady and unidirectional
pulsating and unidirectional
oscillating
None of these
steady and unidirectional
pulsating and unidirectional
Answer
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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be
18°
36°
72°
30°
18°
36°
72°
30°
Answer
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