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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 no load
 any of the above
 full load
 half load

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Electrical Machines
The principle of dynamically induced emf is utilized in

 transformer.
 generator.
 thermocouple.
 choke.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 940 rpm
 975 rpm
 1000 rpm
 950 rpm

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra maximum and Rf minimum
 Ra minimum and Rf minimum
 Ra maximum and Rf maximum

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 Eb is zero, but Td is unchanged
 Eb is unchanged, but Td is zero
 both Eb and Td are zero
 both Eb and Td are unchanged

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
 smooth, concentric commutator properly undercut.
All of these
 brushes should smoothly run in the holders.

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