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Electrical Machines

Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 2 and 1
 2 and 2
 4 ang 1

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Electrical Machines
Commutators in DC machines have a role of which converts

 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.
 AC to DC.
 none of these.

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Electrical Machines
A 3 - Φ slip ring motor has

  double cage rotor.
  any of the above.
  short-circuited rotor.
  wound rotor.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  cumulatively compounded.
 shunt connected.
  series connected.
  deferentially compounded.

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 1.24.
 0.25.
 0.62.
 0.72.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Draw too much current.
  Develop excessive speed and damage itself.
 Produce sparking at brushes.
 Open fuse or circuit breaker.

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