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