Electrical Engineering Questions

The ___________ protective device is determined by multiplying the rated-load current, or the branch-circuit selection current of the hermetic refrigerant motor-compressor, by 225 percent and then adding all concurrent loads such as electric heaters, motors, and so on.

High-voltage fuses are available with either an N or a(n)_______ rating.

The decimal impedance in a transformer is found by determining the ratio of the variable source voltage as compared to the rated voltage of the _____ winding.

The evaporator in a commercial installation normally consists of a ________ coil, through which the building air is circulated by a motor-driven fan.

________is the process of selecting protective devices so that there is a minimum of power interruption in case of a fault or overload.

A 600-volt to 200-volt transformer would become a 600-volt to __________-volt transformer if the connections were reversed.

The cooling system for the drugstore and bakery in the chapter example is a ________ system with the compressor and condenser located on the ground adjacent to the building and the evaporator located in an air-handling unit in the basement.

Rate reductions are made by the power company when the metering measurements are taken on the __________ side of the transformer.

In the precipitator, wires made of which metal give the particles a positive charge?

If the primary current is less than two amperes for a transformer rated at 600 volts or less, the short-circuit protective device can be set at not more than _____ percent of this value.

The tremendous popularity of mechanical refrigeration for household use in the 1930s and 1940s stimulated the development of a new series of nonexplosive and nontoxic refrigerants known as ____ of the halogen family.

One method of removing oil mist is by the use of ______ units.

The correct tension for a belt in the cooling unit drive can be determined from the ________.

Air-cooled condensers use _______ to drive air across the condensing coil.

An alternative to grounding the secondary is to let it _________; that is, the secondary remains ungrounded.

Overload protection of the internal components is covered in the _______ Standards.

A pure ________ element causes the voltage and current to be in-phase with each other

When hermetic refrigerant motor-compressors are designed to operate continuously at currents greater than 156 percent of the rated-load current, the nameplate is marked with _______ current

The step-down transformers, metering, and switching equipment necessary to supply the low voltage loads to the customer are housed in a _______.

Lightning arresters are designed to provide a (n)_______ path to ground for any surge currents such as those resulting from a lightning strike.