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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

All of these
 minimum
 maximum
 zero

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 mechanical rotatory system.
  restoring torque.
 synchronizing power co efficient.
 damping torque.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 ohms.
 1.9 ohms.
 5.7 ohms.
 2.2 ohms.

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

 full load
 no load
 half load
 any of the above

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 11.4 A, secondary = 301 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 602 A, secondary = 22.7 A
 primary = 301 A, secondary = 22.7 A

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Electrical Machines
Open circuit in a transformer is prefered with

 direct current
 rated transformer current
 high frequency supply
 rated transformer voltage

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