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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 speed.
 current.
 power.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.125 p.u
  0.25 p.u
  0.75 p.u
  0.5 p.u

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the speed of the motor.
  it limits the starting current to a safe value.
  It starts the motor.
None of these

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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
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

  10 %.
 50 %.
 15 %.
 25 %.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 less than normal speed.
 more than normal speed.
 normal speed.
 zero.

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