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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 half load
 full load
 any of the above
 no load

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = sX2.
  R2 = s2X2.
  sR2 = X2.
  R2 = s2X2.

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

 10 ohm
 2 ohm.
 0.2 ohm
 100 ohm

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of cork gaskets used in transformer.
 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.
  condition of paper insulation in transformer.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 both 1and 2
 excitation
 load angle
 synchronous reactance

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Zener diode shunt regulator.
  Transistor shunt regulator.
None of these
  Transistor series regulator.

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