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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will
continue running in the same direction as before.
get damaged.
not run.
run in a direction opposite to previous one.
continue running in the same direction as before.
get damaged.
not run.
run in a direction opposite to previous one.
Answer
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Related Question
Electrical Machines
The armature mmf of a DC machine has
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.
triangular space distribution and is stationary in space.
Answer
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Electrical Machines
Wave winding is prefered for which of the following rating?
high current and high voltage
high current and low voltage
low current and high voltage
low current and low voltage
high current and high voltage
high current and low voltage
low current and high voltage
low current and low voltage
Answer
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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
78.5%
67.5%
72.5%
82.5%
78.5%
67.5%
72.5%
82.5%
Answer
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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to
zero.
infinity.
unity.
two.
zero.
infinity.
unity.
two.
Answer
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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as
f
f²
V
V²
f
f²
V
V²
Answer
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