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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 900 rpm
 950 rpm
 850 rpm
 1000 rpm

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 2166.67V, 230 rpm.
 541.67V, 200 rpm.
 541.67V, 250 rpm.
 2166.67V, 270 rpm.

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Electrical Machines
which of the following type of brush and their application is/are correct

 electro graphite → large ratings
All of these
 carbon brush → normal ratings
 copper graphite → low voltage high current density

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Electrical Machines
The type of DC motor used for shears and punches is

 Series motor.
 Differential compound motor.
  Cummulative compound motor.
 Shunt motor.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 150 V.
 220 V.
 280 V.
 240 V.

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 copper loss
 mechanical loss
 iron loss
 both A and B

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