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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?
Cross magnetization
Demagnetization
None of these
Magnetization
Cross magnetization
Demagnetization
None of these
Magnetization
Answer
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Related Question
Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then
Ia remains constant but ωm increase
both armature current Ia and speed ωm increase
both decrese
Ia increases and ωm decreses
Ia remains constant but ωm increase
both armature current Ia and speed ωm increase
both decrese
Ia increases and ωm decreses
Answer
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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is
31.1 Ω
15.9 Ω
15.1 Ω
31.9 Ω
31.1 Ω
15.9 Ω
15.1 Ω
31.9 Ω
Answer
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Electrical Machines
The application that need frequent starting and stopping is
paper mills.
lifts and hoists.
blowers.
jaw crushers.
paper mills.
lifts and hoists.
blowers.
jaw crushers.
Answer
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Electrical Machines
The sparking at the the brushes, in a DC machines is due to
high resistance of carbon brushes.
reactance voltage.
armature reaction.
presence of commutator.
high resistance of carbon brushes.
reactance voltage.
armature reaction.
presence of commutator.
Answer
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Electrical Machines
Which of the following motors are suitable for computer printer drive ?
Shaded pole motor.
Reluctance motor.
Hysteresis motor.
Stepper motor.
Shaded pole motor.
Reluctance motor.
Hysteresis motor.
Stepper motor.
Answer
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