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Electrical Machines
The commutator segments of DC machines are made up of
hard-drawn copper
brass
copper alloy
copper
hard-drawn copper
brass
copper alloy
copper
Answer
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Related Question
Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?
Zero
16.55 Nm
15.6 Nm
15.28 Nm
Zero
16.55 Nm
15.6 Nm
15.28 Nm
Answer
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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?
Slip speed
Zero
None of these
Synchronous speed
Slip speed
Zero
None of these
Synchronous speed
Answer
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Electrical Machines
The output indicate on the name plate of any motor is always the
Gross power.
Output power at the shaft.
Power drawn in KW.
Power drawn in KVA.
Gross power.
Output power at the shaft.
Power drawn in KW.
Power drawn in KVA.
Answer
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Electrical Machines
Which of the following pairs is/are correct?
open slot----- leakage flux is less
closed slot----- leakage flux is high
semi closed slot-----leakage flux is moderate
All of these
open slot----- leakage flux is less
closed slot----- leakage flux is high
semi closed slot-----leakage flux is moderate
All of these
Answer
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Electrical Machines
Which of the following motor has the highest power factor at full load?
Resistance split phase
Capacitor run
Shaded pole
Capacitor start
Resistance split phase
Capacitor run
Shaded pole
Capacitor start
Answer
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