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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

  Fibre.
 Silicon steel.
 Mild steel.
 Cast iron.

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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.

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

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 45 HZ
 50 Hz
 48.5 Hz
 48 Hz

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Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
 Infinitely large.
  Low.
 1000 ohms.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
 No load.
 Low load.
  Full load.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 2
 4
 1
 6

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