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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is
250 A.
570 A.
460 A.
340 A.
250 A.
570 A.
460 A.
340 A.
Answer
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Related Question
Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is
2, 3, 4, 5
2, 3, 4
2, 3 ,5
1, 2, 3
2, 3, 4, 5
2, 3, 4
2, 3 ,5
1, 2, 3
Answer
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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?
-3%
+3%
-3.33%
+3.33%
-3%
+3%
-3.33%
+3.33%
Answer
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Electrical Machines
During no load test, an induction motor draws power
for core loss and windage and friction loss.
for core loss and copper loss.
for copper loss and windage friction loss.
only for the small copper loss.
for core loss and windage and friction loss.
for core loss and copper loss.
for copper loss and windage friction loss.
only for the small copper loss.
Answer
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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?
None of these
same
either of these
exactly opposite
None of these
same
either of these
exactly opposite
Answer
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Electrical Machines
In most condition which frame of motor will be preferred?
Splash proof.
Drip proof.
Totally enclosed fan coiled.
Open type.
Splash proof.
Drip proof.
Totally enclosed fan coiled.
Open type.
Answer
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