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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the
generator armature terminal.
motor field terminal.
motor armature terminal.
generator field terminal.
generator armature terminal.
motor field terminal.
motor armature terminal.
generator field terminal.
Answer
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Related Question
Electrical Machines
In which of the following motors DC excitation is not required?
reluctance motor
3-phase synchronous generator
3-phase synchronous motor
hysteresis motor
reluctance motor
3-phase synchronous generator
3-phase synchronous motor
hysteresis motor
Answer
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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?
Vacuum.
Oil impregnated paper.
Mica.
Glass.
Vacuum.
Oil impregnated paper.
Mica.
Glass.
Answer
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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in
Supply voltage.
Armature voltage.
Field excitaion.
Armature current.
Supply voltage.
Armature voltage.
Field excitaion.
Armature current.
Answer
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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?
1
0.5
any of the above
0
1
0.5
any of the above
0
Answer
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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then
I1 > I2
None of these
I1 = I2
I1 < I2
I1 > I2
None of these
I1 = I2
I1 < I2
Answer
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