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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )
2000 Volt.
0 Volt.
1600 Volt.
1500 Volt.
2000 Volt.
0 Volt.
1600 Volt.
1500 Volt.
Answer
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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing
commutator with large number of segments.
equalizer rings.
graphite brushes.
carbon brushes.
commutator with large number of segments.
equalizer rings.
graphite brushes.
carbon brushes.
Answer
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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by
E1 / E2 = N1 / N2.
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = 1.
E1 / E2 = N1kw1 / N2kw2.
E1 / E2 = N1 / N2.
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = 1.
E1 / E2 = N1kw1 / N2kw2.
Answer
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Electrical Machines
Lamination of transformer core is made of
cast steel.
silicon steel.
cast iron.
wrought iron.
cast steel.
silicon steel.
cast iron.
wrought iron.
Answer
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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the
motor will become slow.
motor will attain dangerously high speed
armature will oscillate about original speed as the mean speed
armature current will drop
motor will become slow.
motor will attain dangerously high speed
armature will oscillate about original speed as the mean speed
armature current will drop
Answer
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Electrical Machines
Which of the following represents the commutator pitch?
Number of conductors spanned by one coil at the front end of the armature.
Number of conductors spanned by one coil at the back end of the armature.
Number of commutator segments between two successive coils.
The distance between the staring of first coil and its next successive coil
Number of conductors spanned by one coil at the front end of the armature.
Number of conductors spanned by one coil at the back end of the armature.
Number of commutator segments between two successive coils.
The distance between the staring of first coil and its next successive coil
Answer
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