NCCER Electrical Level 2 Module 11 'Control Systems and Fundamental Concepts' Questions and Answers

The maximum tungsten/infrared load amperage for a NEMA Size 0 magnetic contactor is ___. 10A A manual reversing starter uses ___. a mechanical interlock Mechanically held relays would most likely be used in a ___. hospital, auditoriums, churches A single-contact device can be used to control multiple loads using a ___. multiple-pole relay A furnace might use an on delay to ___. avoid blowing cold air into the space when the system starts up A type of relay controlled by a magnetic field is a(n) ___. reed relay A type of renewable overload device is a ___. melting alloy relay The operating coil of a relay is designed to work properly at ___. 80% to 110% of the rated voltage A device that allows relays to be controlled as a group while still allowing individual switch control is a ___. master sequencer Where low-voltage cable must be run parallel with high-voltage cable, it should be separated by minimum of ___. 6" (150mm) The function of a shading coil in a contactor is to ___. prevent contact chatter and hum What is the major difference between a contactor and a motor starter? The starter provides overload protection while a contactor does not. The approximate inrush current of filament-type lamps is how many times the normal operating current? 15 to 17