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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 zero
 30 rpm
 1500 rpm
 1470 rpm

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
  230.2 V.
 100 V.
 50 V.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 cummulative compound motor.
 shunt motor.
  series motor.
 AC synchronous motor.

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the polar axis.
 armature midway between poles.
 armature in the polar axis.
 commutator in the inter polar axis.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 provide execessive voltage drop in line.
 damage the armature and commutator.
 all of above.
 draw a starting current many times its rated full load current.

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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 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 1.9 Ω
 2.2 Ω
 5.7 Ω
 6 Ω

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