QUESTIONS WITH COMPLETE ANSWERS
ACCURATE REVIEW MATERIAL GRADED
A+
⩥ What is necessary to reverse direction of a three phase rotary
induction motor?
Answer: Switching two phases coming into the stator.
⩥ What is the method used when to control the braking of an
older AC motor by injecting DC into it.
Answer: Plugging
⩥ What does a closed loop DC motor control have that is not
found on other DC operators.
Answer: An Encoder
⩥ How far does the Traveling cable loop move in relation to the
car movement.
Answer: 1/2 the distance
,⩥ You are installing a 1.75" traveling cable. What should the
diameter of the loop be?
Answer: 52.5"
⩥ Can you use a strain wire as a ground?
Answer: Yes, if it is covered in green insulated covering.
⩥ You are wiring the car operating panel which requires 52
wires, how many wires would you need to pull from the car
junction box?
Answer: 58. (10% spares needed)
⩥ In addition to a warning bell, what devices are required with
automatically closing vertical sliding freight doors?
Answer: Reversing device and Strobe Light
⩥ What is the purpose of the terminal speed limiting device?
Answer: To stop the elevator if the normal slowdowns fail.
⩥ On a 50' vertical run of duct that is secured at the top and
bottom, what is the minimum number of intermediate supports
needed based on NEC article 620.32?
, Answer: 3
⩥ You are piping a pit in a damp location. What type of flex
would you use for a switch?
Answer: Liquid-tight flex.
⩥ You are running conduit to a final limit switch, which type of
conduit should you use?
Answer: EMT and Flex
⩥ You are installing fixtures on a new construction job where
position indicators are required at two of the four floors. Where
would you look to find out which floors have the PI's?
Answer: The job Abstract
⩥ What information is shown on a pull sheet?
Answer: Number of wires and terminal location.
⩥ You are troubleshooting an open safety circuit, which
document would you use?
Answer: Straight-line diagram.