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Electrical Machines

Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 100 ohm
 0.2 ohm
 10 ohm
 2 ohm.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 40 volts.
 10 volts.
 30 volts.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in parallel with the shunt field
 in parallel with the series field
 in series with the series field

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 0o.
 90o.
 less than 90o.
 Greater than 90o.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2.
 I1 = KI2 + Iμ.
 I1 = KI2 + Iw.
  I1 = KI2 + Iw + Iμ.ok

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