HVAC Final Exam 5 Correct Questions & Answers(RATED A+)

A load is an electrical device that _____________________________ - ANSWER uses electricity to do useful work A disconnect switch is used to __________ - ANSWER open and close the main power source to a piece of equipment which of the following are not components of a contactor or relay? - ANSWER thermal element Loads are electrical devices that consume electricity to do _______________ work - ANSWER useful _____ are devices such as motors solenoids resistance heaters and other current consuming devices - ANSWER loads A ____________________ is an electrical device that consumes electric energy to rotate a device in an electric system. - ANSWER motor _______ are the largest and most important loads in heating and cooling and refrigeration systems - ANSWER motors The _____ is a device that creates a magnetic field when energized and causes some action to an electric component - ANSWER solenoid solenoid ________ open and close, stopping or starting the flow of some medium - ANSWER valves ______ take electric energy and convert it to heat - ANSWER heaters the ______ is composed of a solenoid and the contacts - ANSWER relay the term ______ refers to one set of contacts - ANSWER pole the term _____ refers to the position of a set of when a device is de-energized - ANSWER normally normally closed contacts ________ when the relay or contractor is energized - ANSWER open the ______ indicates how the switch may be operated - ANSWER throw thermostats are ________ operated switches used in most control systems - ANSWER mechanically