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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  aluminium.
  stainless steel.
  carbon.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.9 Ω
 31.9 Ω
 31.1 Ω
 15.1 Ω

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

 950 rpm
 900 rpm
 850 rpm
 1000 rpm

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 96 V
 384 V
 192 V
 768 V

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 not run.
 run at normal speed.
 run at lower speed.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 8+j13 ohms
 3.5+j5.8 ohms
 53+j85 ohms
 3.05+j5.08 ohms

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