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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 V²
 supply voltage V
 1/V

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are parallel.
 Armature winding is in series with load.
  Armature and field both are in series with the load.
 Armature and field both are connected.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ P.
 T is independent of P.
 T ∝ √P.
 T2 ∝ P3.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Differential compound motor.
  Series motor.
  Cumulative compound motor.
  Shunt motor.

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 0 V.
 40 V.
 60 V.
 20 V.

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