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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmax to Imin
 Vmin to Imin
 Vmax to Imax

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

 4 and 2
 2 and 2
 4 ang 1
 2 and 1

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

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

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 more and maximum torque decreases
 more and maximum torque remains constant
 less and maximum torque decreases
 less and maximum torque increases

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 more.
 less than 50%.
 same.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 4 time the initial value
 1/4 of the intial value
 1/2 of the initial value
 twice the initial value

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MORE MCQ ON Electrical Machines

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