Nccer Electrical Level 2 Module 2-Solved
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
For a constant-torque load, the horsepower increases and decreases - ANSWER-in
direct proportion to the speed
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
For a constant-torque load, the horsepower increases and decreases - ANSWER-in
direct proportion to the speed
