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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 increase
None of these
 either increase or decrease

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V
 V²
 f

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Electrical Machines
Dynamic braking is very effective for

 series motors.
 differential compound motors.
 separately excited motors.
 shunt motors.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 15 %.
 50 %.
  10 %.
 25 %.

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  aluminium.
  stainless steel.
  silicon steel.

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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

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

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