Contacts {Ans: The___of a relay or contactor must make good direct contact when energized for the device to function properly.}Thermostat {Ans: The temperature in any structure, regardless of its age, location, or design, can be maintained at comfortable levels with a___.}Blowers {Ans: Most large commercial and industrial conditioned air systems use large___to supply the air flow that is needed to condition the structure.}Line break {Ans: The___ ___overload breaks the power to a motor.}Separator {Ans: Ball bearings are designed with an inner and an outer ring, which enclose the balls by use of a___.}Thermostat {Ans: The basic control cycle of a gas heating appliance is initiated when a switch, usually a___, closes to call for heat.}