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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC compound motor.
 DC series motor.
 DC Shunt motor.
 Synchronous motor.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 3.1 Ω
 2 .1 Ω
 1.79 Ω
 1.8 9 Ω

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Electrical Machines
Which of the following motor has negative speed regulation?

 Series motor
 Differential compound motor
 Cumulative compound motors
 Shunt motor

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  0.1.
  0.05.
  1.0.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Induced emf.
 Mechanical power.
 Can not be determined.
 Armature current.

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