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Electrical Machines

Electrical Machines
The emf induced in the dc generator armature winding is

 AC
 DC
None of these
 AC and DC

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1470 rpm
 1500 rpm
 30 rpm
 zero

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

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

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 266.20 N-m.
 133.22 N-m
 234.76 N-m.
 cant be determined.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has its field winding consinting of thick wire and less no of turns.
 Has a poor torque.
 Can be started easily without load.
 Has a almost constant speed.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Reduce by 5%.
 Remain unchanged.
 Depends on other factor.
  Increase by 5%.

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