QUESTION The purpose of an interpole in the DC motor design is to ____. reduce heat generated under load increase torque when running under heavy load conditions reduce rpm when under exceptional mechanical loads reduce sparking at the commutator
QUESTION
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The purpose of an interpole in the DC motor design is to ____.
reduce heat generated under load
increase torque when running under heavy load conditions
reduce rpm when under exceptional
mechanical loadsreduce sparking at the commutator
QUESTION
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One of the dangers of Series motors is : _______________
They are inherantly unstable and should never be used.
The motor can reach dangerous RPM if there is no load.
The motor overheats quickly when loaded at 100%
The CEMF will stop the motor too quickly when the load is suddenly reduced.
QUESTION
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As a motor increases in rotational velocity to 100% of the rated RPM, the CEMF induced in the motor:
increases upto 7 to 10x the source voltage.
almost zero.
increases to the point where it is almost the same as the source voltage.
stays the same
QUESTION
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The size of the conductor feeding the motor should be able to carry at least ____ of the full-load current.
125%
200%
150%
100%
QUESTION
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The proper way to determine the required over-current protection is to:
determine the FLA based on the nameplate.
Use the standard rule of thumb that the over-current protection shall be 7 to 10x the locked rotor amps.
determine the watts by converting the HP rating on the nameplate to watts.
to determine the FLC by looking up the value in the appropriate table(s) in the NEC as they relate to the horsepower of the motor.
QUESTION
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The resistance of the Armature's conductor coil(s) in most motors is: _________.
quite high, usually a few thousand ohms or more depending on the size of the motor.
Typically an open circuit value on most multimeters
quite low, usually a few ohms or less depending on the size of the motor.
very high, usually in the megaohms.
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