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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.
33.33 Amp.
44.47 Amp.
43 Amp.
29 Amp.
33.33 Amp.
44.47 Amp.
43 Amp.
29 Amp.
Answer
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Cogging of induction motor occurs at
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low voltage and when stator and rotor poles are equal.
high voltage and when stator and rotor poles are equal.
high voltage and when stator and rotor poles are not equal.
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low voltage and when stator and rotor poles are equal.
high voltage and when stator and rotor poles are equal.
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Answer
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The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.
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25 %.
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Answer
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Electrical Machines
Maximum power will be developed when back emf is
All of these
half of the supply voltage.
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All of these
half of the supply voltage.
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Answer
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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as
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zoom.
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Answer
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A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is
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Answer
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