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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.
120 volt.
218.5 volt.
220.4 volt.
None of these.
120 volt.
218.5 volt.
220.4 volt.
None of these.
Answer
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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?
Star side leads by 30°.
Delta side leads by 30°.
Star side lags by -30°.
Delta side lags by -30°.
Star side leads by 30°.
Delta side leads by 30°.
Star side lags by -30°.
Delta side lags by -30°.
Answer
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Electrical Machines
A 220 V DC machine has an armature resistance 1ÃŽÂ©. If the full load current is 20 A, the difference of induced voltage and generator is
40 V.
60 V.
20 V.
0 V.
40 V.
60 V.
20 V.
0 V.
Answer
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Electrical Machines
The heat transfer by convection in a transformer least depends on
color of the paint.
surface area.
temperature difference.
air velocity.
color of the paint.
surface area.
temperature difference.
air velocity.
Answer
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Electrical Machines
Which of the following represents the commutator pitch?
Number of commutator segments between two successive coils.
Number of conductors spanned by one coil at the front end of the armature.
The distance between the staring of first coil and its next successive coil
Number of conductors spanned by one coil at the back end of the armature.
Number of commutator segments between two successive coils.
Number of conductors spanned by one coil at the front end of the armature.
The distance between the staring of first coil and its next successive coil
Number of conductors spanned by one coil at the back end of the armature.
Answer
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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by
Ampere law.
Fleming's left hand rule.
Fleming's right hand rule.
Lenz's law.
Ampere law.
Fleming's left hand rule.
Fleming's right hand rule.
Lenz's law.
Answer
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