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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?

 30 rpm
 zero
 1500 rpm
 1470 rpm

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Electrical Machines
Which of the following will vary the maximum torque?

None of these
 both 1 and 2
 rotor reactance X
 rotor resistance R

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 340 A.
 570 A.
 250 A.
 460 A.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 240 V
 120 V
 175 V
 140 V

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
  lagging.
 leading.
 unity.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 90 %
 Around 100 %.
 Less than 50 %
 Any where between 75 % and 90 %.

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