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1 what is the formula for finding the speed of an ac squirrel cage induction motor2 if several motors driving an
a motor is tripping out on overload the motor nameplate reveals a full-load current of 168 amperes when the motor is
1 show that if the coefficient of friction between the block and the plane is 035 the force required to just start the
1 motors will operate satisfactorily at what percent over and under voltage2 what basic sensory faculties should a
1 what is meant by feedback speed control2 how is the magnetic drive used as an adjustable speed
1 how is the magnetic clutch engaged and disengaged2 what devices may be used to energize the magnetic clutch
1 discuss some basic installation requirements for a programmable controller2 what is the major advantage of the
1 who shall operate and maintain electrical machinery2 why should the motor be run for a period of time following
1 what might be a hazard if a motor is started in the wrong direction2 when a coil does not pick up what are the
1 why are some solid-state controllers easy to troubleshoot2 how is a solid-state diode tested explain3 using a
1 what are the three main electrical test instruments used in troubleshooting2 what is the advantage of a plunger-type
1 what standard covers ductboard and methods of connecting and sealing ductboard2 what standard covers flexible duct
1 list the agencies that promote duct standards and briefly describe what they cover2 explain the difference between a
1 describe how two pieces of round sheet-metal pipe are joined2 describe how sheet-metal ductwork is sealed3 describe
1 how far apart should hangers for metal duct be placed2 how far apart should hangers for fiber ductboard be placed3
1 how is the magnetic clutch engaged and disengaged2 what devices may be used to energize the magnetic clutch3 which
1 how does a duct blaster measure the amount of duct leakage2 what are the two main types of duct-cleaning equipment
1 describe how to install a dovetail takeoff fitting on a ductboard trunk2 what are some of the limitations on the use
1 how do the staples that hold duct insulation together work2 what is the correct spacing for the mechanical fasteners
1 if an electrical load on an air-conditioning system is not working what must the technician try to determine2 what
1 how does condenser size affect the eer2 what has the predominant effect on the amount of subcooling produced in the
1 discuss the evolution of the heat exchanger2 discuss the operation of an atmospheric burner3 explain why furnace
1 list the four categories of gas-fired furnaces based on flue-gas temperature and pressure2 explain the difference
1 why are lp gases considered more hazardous than natural gas2 describe the two types of flames and their