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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at normal speed.
 burn.
 run at lower speed.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 OC and SC tests
None of these
 load test
 back to back test

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Electrical Machines
Commutators in DC machines have a role of which converts

 none of these.
 AC to DC.
 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
 Proportional to the square of armature current.
  Constant.
 Inversely proportional to armature current.

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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
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/4Sa²
 PZL/ 4Sa
 PZL/4Sp²
 PZL/4S

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