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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
 high viscosity.
  low viscosity.
 low BDV.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²
 PZL/4Sp²

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

  Constant.
 Proportional to armature current.
 Proportional to the square of armature current.
 Inversely proportional to armature current.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 double.
 one fourth.
 4 times.
 half.

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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
What is the necessity of copper brushes in a dc motors?

  To increase the flux cutting by the rotor.
  To absorb the mechanical shocks produced during running condition.
  To convert alternating supply current to direct current.
  None of these.

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