Nccer electrical Level 2 Module 2 (2024) Quizzes & Ans..
Any exposed live parts must be guarded if they are operating at Answer- 50V or more between terminals
Which of the following are most likely to use dynamic braking? Answer- Forklifts
In a DC series motor, how much of its full-load torque is developed at starting? Answer- 500%
For a given number of poles, which of the following determines the speed of an AC motor? Answer- Frequency
Which of the following motors is used where the required starting torque is high and speed control is desirable Answer- compound
the synchronous speed at which a four-pole, 60Hz induction motor operates is Answer- 1,800 rpm
slip is best described as . . . Answer- 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? Answer- induction motors
horsepower is used to rate the Answer- output capacity of a motor
How many motor designs does NEMA designate Answer- 5
In a split-phase motor, how much greater is the starting current when compared to the full-load current? Answer- 6 to 8 times
The capacitor-start motor is the single-phase motor type that has the Answer- highest starting torque
The wound rotor induction motor is used Answer- for speed control and to limit starting current
which of the following is true of shaded-pole motor? Answer- they have a low starting torque, a low efficiency, and a high noise level
Any exposed live parts must be guarded if they are operating at Answer- 50V or more between terminals
Which of the following are most likely to use dynamic braking? Answer- Forklifts
In a DC series motor, how much of its full-load torque is developed at starting? Answer- 500%
For a given number of poles, which of the following determines the speed of an AC motor? Answer- Frequency
Which of the following motors is used where the required starting torque is high and speed control is desirable Answer- compound
the synchronous speed at which a four-pole, 60Hz induction motor operates is Answer- 1,800 rpm
slip is best described as . . . Answer- 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? Answer- induction motors
horsepower is used to rate the Answer- output capacity of a motor
How many motor designs does NEMA designate Answer- 5
In a split-phase motor, how much greater is the starting current when compared to the full-load current? Answer- 6 to 8 times
The capacitor-start motor is the single-phase motor type that has the Answer- highest starting torque
The wound rotor induction motor is used Answer- for speed control and to limit starting current
which of the following is true of shaded-pole motor? Answer- they have a low starting torque, a low efficiency, and a high noise level
