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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is
60 V.
0 V.
20 V.
40 V.
60 V.
0 V.
20 V.
40 V.
Answer
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Related Question
Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause
negative sequence current.
less heating of the rotor.
all of these.
less heating of the rotor.
negative sequence current.
less heating of the rotor.
all of these.
less heating of the rotor.
Answer
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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by
Vt= Ea + Iara
Vt = Ea + Iara+ ILrs
Vt = Ea + Ia(ra + rs)
Vt= Ea– Iara
Vt= Ea + Iara
Vt = Ea + Iara+ ILrs
Vt = Ea + Ia(ra + rs)
Vt= Ea– Iara
Answer
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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.
120 volt.
218.5 volt.
None of these.
220.4 volt.
120 volt.
218.5 volt.
None of these.
220.4 volt.
Answer
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Electrical Machines
A crusher is equipped with
Synchronous motor.
DC shunt motor.
Slip ring induction motor.
Reluctance motor.
Synchronous motor.
DC shunt motor.
Slip ring induction motor.
Reluctance motor.
Answer
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Electrical Machines
The armature mmf of a DC machine has
triangular space distribution and is stationary in space.
trapezoidal space distribution and is stationary in space.
stepped distribution and rotates at the speed of armature.
triangular space distribution and rotates at the speed of armature.
triangular space distribution and is stationary in space.
trapezoidal space distribution and is stationary in space.
stepped distribution and rotates at the speed of armature.
triangular space distribution and rotates at the speed of armature.
Answer
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