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Electrical Machines
Tappings of a transformer are provided
at the middle of hv side
at the neutral side end of hv side
at the phase end of lv side
at the phase end of hv side
at the middle of hv side
at the neutral side end of hv side
at the phase end of lv side
at the phase end of hv side
Answer
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Related Question
Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are
1000 rpm, 950 rpm.
zero, 950 rpm.
zero , - 50 rpm.
1000 rpm, - 50 rpm.
1000 rpm, 950 rpm.
zero, 950 rpm.
zero , - 50 rpm.
1000 rpm, - 50 rpm.
Answer
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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be
25 kW.
26.21 kW.
23.06 kW.
24.11 kW.
25 kW.
26.21 kW.
23.06 kW.
24.11 kW.
Answer
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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be
0.72.
0.25.
1.24.
0.62.
0.72.
0.25.
1.24.
0.62.
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 2
1 and 3
2 and 3
1, 2 and 3
1 and 2
1 and 3
2 and 3
1, 2 and 3
Answer
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Electrical Machines
For power factor improvement the synchronous motor is to be
lightly loaded and over excited
heavily loaded and over excited
lightly loaded and underecited
heavily loaded and underexcited
lightly loaded and over excited
heavily loaded and over excited
lightly loaded and underecited
heavily loaded and underexcited
Answer
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