NCCER Electrical Level 2 Module 2 Motors- Theory and Application Sections 4-6 Questions and Answers

The two primary types of motor enclosures classified by NEMA are ____. open and totally enclosed An open AC squirrel cage motor that makes use of form-wound coils and an insulation system is known as a(n) _____. sealed windings(type) The NEMA frame designation for gasoline pump motors is ____. G The letters FLA on a motor nameplate stand for ____. full-load amps To determine the horsepower rating of a motor that is already installed and in place, ____. check the nameplate data Most industrial motors are NEMA Design ____. B The multiplier to the nameplate horsepower rating is called the _____. service factor The code requirements for motor disconnects are covered in ___. 430.102 All motors must have a thermal protector if their voltage rating is greater than _____. 600V-1,000V To protect the motor from overloads and starting failures, use a ____. thermal protector When studying the operation of electric motors, it is important to remember that magnetic lines of force ____. do not cross If a motor has 4 poles and is operating at a frequency of 60Hz, its synchronous speed is _____. 120(60Hz)/4= 1,800 rpm 1,800 rpm The type of motor most likely to be used in a location with flammable dust and torque fluctuations is a ____. squirrel cage induction motor A heating system is most likely to use a _____. single-phase induction motor