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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 25 Hz
 50 Hz
 0 Hz

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 0 Hz
 1 Hz
 5 Hz

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Electrical Machines
The direction of rotation of a DC motor can be determent by

 Lenzs law.
 Amperes law.
 Flemings right hand rule.
  Flemings left hand rule.

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Electrical Machines
Maximum power will be developed when back emf is

 double the supply voltage.
 equal to supply voltage.
 half of the supply voltage.
All of these

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 machine A
 machine B
 none of these
 any of the two machines

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Electrical Machines
The armature shaft must be able to withstand

 twisting strains due to transmission of torque.
 any unbalanced magnetic pull on the armature core.
 bending moment due to weight of the armature.
All of these

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