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Electrical Machines
Which type motors are preferred for lathes?
Squirrel Cage induction motor.
Synchronous motor.
Either A or B.
DC shunt motors.
Squirrel Cage induction motor.
Synchronous motor.
Either A or B.
DC shunt motors.
Answer
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Related Question
Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?
2166.67V, 230 rpm.
2166.67V, 270 rpm.
541.67V, 200 rpm.
541.67V, 250 rpm.
2166.67V, 230 rpm.
2166.67V, 270 rpm.
541.67V, 200 rpm.
541.67V, 250 rpm.
Answer
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Electrical Machines
For higher values of armature, the speed of a DC series motor is
Proportional to armature current.
Constant.
Proportional to the square of armature current.
Inversely proportional to armature current.
Proportional to armature current.
Constant.
Proportional to the square of armature current.
Inversely proportional to armature current.
Answer
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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?
Stator core loss
Stator copper loss
Rotational loss
All of these
Stator core loss
Stator copper loss
Rotational loss
All of these
Answer
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Electrical Machines
Tappings of a transformer are provided
at the neutral side end of hv side
at the phase end of lv side
at the phase end of hv side
at the middle of hv side
at the neutral side end of hv side
at the phase end of lv side
at the phase end of hv side
at the middle of hv side
Answer
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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.
remain the same.
be unpredictable.
decrease.
increase
remain the same.
be unpredictable.
decrease.
increase
Answer
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