Why is three-phase power more efficient than single-phase power?
What will be an ideal response?
Power in a three-phase system never drops to zero. Each phase drops to zero and changes polarity, but all three phases are not simultaneously at zero.
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A(n) ____________________ is the same type of device as a contactor in terms of the ampere rating of the device, but it has a means of overload protection in it.
Fill in the blank(s) with the appropriate word(s).
The _____ is the horizontal distance covered by a single rafter in a gable roof.
A. run B. span C. rise D. pitch
Columns, one of the most frequently used precast concrete products, are cast with a heavy steel ____ in one end so that they can be attached to a footing.
A. connection plate B. baseplate C. weld plate D. angle plate
Which of the following statements is true when comparing the series and shunt field windings of a DC motor?
A. The shunt winding must handle more current than the series winding. B. The shunt winding handles an equal amount of current as the series winding. C. The series winding handles more current than the shunt winding. D. The series winding handles less current than the shunt winding.