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Electrical Machines

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?

 950 rpm
 975 rpm
 1000 rpm
 940 rpm

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

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Field resistance.
 Residual magnetism of the generator.
 None of above.
 Armature resistance.

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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 lap-winding ?

 PZL/4SP²
 PZL/4S
 PZL/4Sa²
 PZL/ 4Sa

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Electrical Machines
In synchronous generator V curve is drawn between

 either of these.
 field current on Y-axis and armature current on X-axis.
 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of induced emf.
 direction of motion of the conductor.
 direction of flux.
 opposite to the direction of motion of the conductor.

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