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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
31.9 Ω
15.1 Ω
31.1 Ω
15.9 Ω
31.9 Ω
15.1 Ω
Answer
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Related Question
Electrical Machines
Which of the following machine will have maximum efficiency?
Electrical power transformer.
Electrical power generator.
DC motor.
Induction motor.
Electrical power transformer.
Electrical power generator.
DC motor.
Induction motor.
Answer
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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will
Develop excessive speed and damage itself.
Draw too much current.
Open fuse or circuit breaker.
Produce sparking at brushes.
Develop excessive speed and damage itself.
Draw too much current.
Open fuse or circuit breaker.
Produce sparking at brushes.
Answer
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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will
worsen and terminal voltage will fall
improve and terminal voltage will rise .
worsen and terminal voltage will rise.
improve but terminal voltage will fall.
worsen and terminal voltage will fall
improve and terminal voltage will rise .
worsen and terminal voltage will rise.
improve but terminal voltage will fall.
Answer
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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of
0o.
Greater than 90o.
90o.
less than 90o.
0o.
Greater than 90o.
90o.
less than 90o.
Answer
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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor
Decrease.
Remains same.
Increase.
None of these.
Decrease.
Remains same.
Increase.
None of these.
Answer
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