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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 provide protection against Low-Voltage.
 limit the starting current to a safer value.
 all of above.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 68%
 40%
 60%
 38%

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 leakage reactance
 efficiency
 ratings
 per unit impedance

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 sin (α/2)
 Cos α²
 Cos α

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 cumulative compound motors
 shunt motors
 series motors

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