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Nccer electrical Level 2 Module 2
Any exposed live parts must be guarded if they are operating at 50V or more between terminals Which of the following are most likely to use dynamic braking? Forklifts In a DC series motor, how much of its full-load torque is developed at starting? 500% For a given number of poles, which of the following determines the speed of an AC motor? Frequency Which of the following motors is used where the required starting torque is high and speed control is desirable compound the synchronous speed at which a four-pole, 60Hz induction motor operates is 1,800 rpm slip is best described as...
The difference between the synchronous speed and the speed of the rotor in an induction motor Which of the following motor operate on the principle of a rotating magnetic field? induction motors horsepower is used to rate the output capacity of a motor How many motor designs does NEMA designate 5 In a split-phase motor, how much greater is the starting current when compared to the full-load current? 6 to 8 times The capacitor-start motor is the single-phase motor type that has the highest starting torque The wound rotor induction motor is used for speed control and to limit starting current which of the following is true of shaded-pole motor?
which of the following motors provide constant speed from no-load condition to full load conditions? synchronous The most common service factor appearing on a motor's nameplate is
NEC article 430 covers the application and installation of motors The stationary magnet of a DC motor is represented by the field poles which of the following motors is the best installation choice for an application requiring adjustable speeds? DC The Speed of a three-phase squirrel cage induction motor is controlled by the frequency of the applied voltage and the number of poles DC injection braking is used on the stationary windings of AC motors
The NEC requires motor disconnecting means be within sight of the controller location a three phase synchronous motor has three stator windings that are 120 degrees apart A three phase induction motor may have 2 poles A motor enclosure that minimizes the entrance of a rain and airborne particles to the electrical parts is consider a ___ motor? weather-protected which motor should be used for applications that require frequent starts without overheating the motor? round rotor induction motor According to NEMA definitions, which of the following is a type of totally enclosed motor? water-cooled which type of motor can be easily revrsed by switching two of the leads three phase induction motor
