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MECHANICS M.E. NEEP EXAM: VERIFIED QUESTIONS AND ANSWERS 100%
CORRECT | A+ GRADE
“A contractor wants to raise the car speed from 100 fpm to 125 fpm, it currently has a 12" sheave.
What is required? - CORRECT ANSWER 100 fpm/125 fpm= 12"/ X =15"
"There is slight arcing between the brush and commutator. What action must be taken? -
CORRECT ANSWER None
Note: Heavy arcing= light brush pressure, Heavy brush pressure= mechanical wear" "If rigging is roped 3:1 and a BEAM CLAMP is used to lift a 6,000lb load. What is the beam
capacity? - CORRECT ANSWER 18,000lbs -210"
"How much resistance is measured over a normally closed switch? - CORRECT ANSWER.
Ohms- should be zero but will never be that low" "A car traveling in the hoistway always stops at the same spot and blows a fuse. What causes this?
- CORRECT ANSWER traveling cable has a cut/exposed wire or a short - 515"
"How is a class 1 yearly buffer test preformed? - CORRECT ANSWER Car at the bottom
landing and on inspection, jump out direction and final limits. With pit clear, run down to compress the buffers, buffers should fully extend within 90 seconds. Note: 5 yr is Full load, full speed - 555"
"How many strain supports are required on a 350 ft raceway? - CORRECT ANSWER 4
1 every 100ft - 505-510"
"How is stainless steel drilled out? - CORRECT ANSWER Slow speed and constant pressure -
"What is the required amout of retainer clips for wedge shackles and what is the spacing? -
CORRECT ANSWER At least 2. First clip being 4 times the diameter of the rope from the top of
the shackle, and the second clip is 8 times the diameter of the rope away from the shackle. - 245"
"A 300 ohm resistor burns out, but you dont have another one. How can you make one? -
CORRECT ANSWER 2- 600 ohms resistors in parallel is 300 ohms. Resistance is half of the
highest resistor in the parallel circuit. 3- 225 ohms is 75 ohms. - 345"
"When cutting laminated panels, which direction should the finish side face? - CORRECT
ANSWER Finish side facing the cutting edge of the tool. Blade will burr the backside. - 225"
"How do you cut a finished floor? - CORRECT ANSWER Cutting blade away from the finished
side - 255" "A 480 VAC stepdown 240 VAC transformer is connected to a 3 phase rectifier, what is the output
voltage? - CORRECT ANSWER 320 VAC
3 phase full wave= 1.33 x output voltage. - 715" "How many points of contact must be maintained on a ladder? How far above the landing must it
extend? What is the proper ratio? What steps dont we use? - CORRECT ANSWER 3 points of
contact 3 feet above the landing 4:1 ratio top 2 steps do not get used - 135"
"What is the conversion formula when measuring inches to millimeters? - CORRECT
ANSWER 1" = 25.4 mm"
"You open a dumbwaiter access panel and it still runs, what is the problem? - CORRECT
ANSWER Pit access switch is not working properly - 550"
"You perform a static load test with the pit valve closed. The car sinks 6" in 15 minutes. What is
the problem? - CORRECT ANSWER Cylinder leak - 805"
"Where should you aim a fire extinguisher to put out a fire? - CORRECT ANSWER At the base
of the fire - 100" "Car with selective collective system is moving to the lobby to take a call, an up call is put in at the
2nd floor, what happens? - CORRECT ANSWER The call is bypassed until the car is traveling
in the UP direction - 740" "With a 7 foot platform, your inside cab wall clearance is 6'8". What is the thickness or take up of
walls? - CORRECT ANSWER 2 inch thick walls"
"You notice Roughing on the Gov and Tail Sheave. What should you check? - CORRECT
ANSWER Rope diameter - 250"
"What is the ratio between the loop and diameter of a round traveler? - CORRECT ANSWER
30 times - 515"
"What is the purpose of a gear reduction unit on a geared machine? - CORRECT ANSWER
Increased lifting capacity"
"What holds a stopped Hydraulic elevator? - CORRECT ANSWER Check valve"
"What must be done if you get on top of a dumbwaiter? - CORRECT ANSWER Never fully get
on top. Work only partially on with the mainline disconnect off."
"How do you measure an escalator handrail? - CORRECT ANSWER Mark the top and bottom
of the inclination, measure in between and mov the car until the bottom mark is at the top. measure again and continue doing this until you see your 1 mark. The last measurement will be shorter. Add all the measurements together to get your length. -835"
"A moving walk has an inclination of 10 degrees, what is the highest angle in can be? - CORRECT
ANSWER 12 degrees for a moving walk
31 degrees for an escalator"
"In a Ward-Leonard system, if all 3 contacts close what will happen? - CORRECT ANSWER
The car run at full speed - 415"
"What type of oil do you put in the machine? - CORRECT ANSWER Gear oil, non-detergent,
single viscosity"
"A 75 ohm resistor has blown, no replacement, how do you fix it? - CORRECT ANSWER 3 - 225
ohms in parallel. 3- 25 ohm resistors in series."
"If a Rack and Pinion hoist is not plumb, level and square. What can happen? - CORRECT
ANSWER Set the safeties"
"What are extension tubes used for? - CORRECT ANSWER Necessary clearance for
placement of concrete forms."
"If a hoist motor is making noise, what is the problem? - CORRECT ANSWER To help prevent
distortion to the building AC supply, INDUCTORS can be used on AC input of a solid state drive. Inductors can serve double duty, they operate as transformers, to match input voltage, or provide voltage isolation. As well as performing filtering on notch effect."
"What is the area of a 10" plunger? - CORRECT ANSWER Pie x Radius Squared= Area
3.14x5x5=78.5"
"The escape hutch opens in what direction? - CORRECT ANSWER From the outside of the car
up, preventing people from getting on top of the car"
"What drawing will show how many and location of fixtures? - CORRECT ANSWER The
elevator abstract. Rails, lanterns, push buttons, etc. and quantity, color, material, etc"
"You are working with eye bolts, where would you check for lifting capacity? - CORRECT
ANSWER NEVER use eye bolts for hoisting"
"You are installing the limit cam on the car and notice that the holes are not lining up. Where do
you find the correct location for the cam? - CORRECT ANSWER The mechanical detail
drawing" "You are on a call and find the pulley came off the pump motor and the set screw is missing, what
kind of screw would you use to replace the set screw? - CORRECT ANSWER Cup screw"
"You have to measure the outside of a pipe. What tool would you use? - CORRECT ANSWER
Caliper Rule"
"You are installing spring buffers on a 200 fpm car, what is the minimum buffer stroke? -
CORRECT ANSWER 200 fpm= 4 inch Note: 100 fpm= 1 1/2 inch Note : 100 fpm- 150 fpm = 2
1/2 inch"
"You are going to replace the disc on your grinder, what test should you do before using? -
CORRECT ANSWER Ring test"
"How often do electrical cords need to be checked for continuity? - CORRECT ANSWER Every
3 months"
"The DBG is 6'6" using 15 lb rails with 1/4 shim on the brackets, what is DBB? - CORRECT
ANSWER (2) 15 lb rails is 3 1/2 deep= 7" total. (2) 1/4" shims= 1/2" 6'6"+ 7 1/2 = 7 foot 1 1/
inch" "Which of the following maintenance procedures addresses the issue of proper DC generator
commutation? - CORRECT ANSWER Continued contact between brushes and commutator"
"Freight doors are binding because they are hanging out of square, what adjustments can you
make? - CORRECT ANSWER Adjust door track chains"
"You are about to start installing your duct run in the hoist way. What is the best method to give
you the straightest line? - CORRECT ANSWER Using a plumb bob, snap the line, and measure
off of the rail"
"When installing multiple traveling cables, where is the first cable located? - CORRECT
ANSWER First is closest to the rail"
"2 controllers in a small machine room face each other, what is the minimum clearance between
them? - CORRECT ANSWER 36 inches"
"When installing travelers, what is the minimum length of vertical suspension at both ends
before the loop starts? - CORRECT ANSWER 4 feet"
"You attempt to adjust a new VV-VF door operator, but it operates in the wrong direction. How do
you change the direction? - CORRECT ANSWER Change the phase sequence"
"You receive a call that a center opening car is running with one door partially open, how is this
possible? - CORRECT ANSWER The gate switch is activated by door drive, but the relating
device has failed" "In order to properly bond an isolation platform, where should you connect your bonding straps?
- CORRECT ANSWER From the platform to the car sling"
"As a mechanic you are sent to install an escalator, what point of reference would you use to
square the unit? - CORRECT ANSWER Column line"
"Escalator demarcation lights are required by code for what reason? - CORRECT ANSWER
Provides passengers a visual indication when entering and exiting the unit" "While adjusting a passenger elevator door operator with a permanent magnet dc motor, which
operation would you perform to control the motor? - CORRECT ANSWER Speed and torque
control is accomplished by varying armature current and voltage" "What dose ASME code specify regarding clearance between skirt panel and the side of the step
tread? - CORRECT ANSWER Skirt board switches required at upper and lower ends. Gap no
more than 3/16""
"After receiving an inspection report, one violation is door closing force. After checking you read
50 lb of door force, is this code? How do you make it code compliant? - CORRECT ANSWER
Not code. Code is < 30 lb. To fix you need to adjust the torque/speed of door operator" "You momentarily actuate the motor starting relay, the direction of rotation is not correct, what
can be done to change rotation direction? - CORRECT ANSWER Reverse any 2 leads of
incoming motor phases"
"Before you can move a piston on a hydro, what precautions must be taken? - CORRECT
ANSWER Check the piston for debris and tightness of the head, make sure pit is clear"
"You are preparing to hoist the car for cable installation, before doing this, what needs to be
installed? - CORRECT ANSWER The governor cable"
"While on service you observe the mechanical style safety edges on center opening doors bumping into each other, reopening the doors. Where do you need to look to repair this problem?
- CORRECT ANSWER The safety edge retraction mechanism"
"You are about to trouble shoot an elevator that is off, what print would help make it easier to
trace the circuits? - CORRECT ANSWER Straight line diagram"
"The fuses on a 3 phase input to DC direct drive are open, and the elevator will not run, what
needs to be done to check for a shorted SCR? - CORRECT ANSWER Remove the SCR, connect
- lead to anode, - lead to cathode, jumper between anode and gate .7v if good. Remove jumper and it should stay on, remove a lead should read infinite" "Troubleshooting a 3 input and gate, all inputs are high, but the gate output is low. What is the
problem? - CORRECT ANSWER Faulty gate. Truth table says output should be high."
"Youre going to a trouble call and you find that the machine room has 2 inches of water in it, what
is the first thing you do? - CORRECT ANSWER Leave the machine room"
"You find a blown fuse in the DC circuit feeding the door motor. When picking a replacement fuse
what should you do? - CORRECT ANSWER Compare the blown fuse to the fuse rating in the
straight line diagram" "A DC door motor supplied from a 3 phase rectifier runs slow. The DC voltage that is normally 320
is 220. What should you do? - CORRECT ANSWER Check the fuse feeding the AC rectifier"
"There is a call that a traction elevator is stuck in the overhead. In order to get the car down, what
circuits do you need to jump out? - CORRECT ANSWER The primary safety circuits"
"What door is heavier on bi-parting freight doors? - CORRECT ANSWER The lower door
because of the tucking sill"
"What happens to the break when contact E opens? - CORRECT ANSWER Inserts more break
resistance in the circuit, reducing the value of the break current. More resistance to hold the coil up and release current draw."
"In a circuit with capacitance of 5 mf 120v and 200K ohm, how long to fully charge? - CORRECT
ANSWER 5TC"
1" is equal to ______ cm - CORRECT ANSWER 2.54 cm"
"1" is equal to ______mm - CORRECT ANSWER 25.4 mm"
"Circumference Formula - CORRECT ANSWER C = 2 πr"
"Area of a circle - CORRECT ANSWER A= πr²"
"Pressure formula - CORRECT ANSWER Pressure = Force/Area or P = F/A"
"RPM formula - CORRECT ANSWER 60 x F /( N/2) where F(frequency is Hz) N is the
number of poles Example: what is the rotating speed of a three phase 30 HZ 6 pole motor? 60 x 30hz = 1800 1800 •/• 3 poles = 600RPM"
"Time constant formula in resistive capacitive circuit - CORRECT ANSWER T = RC where T is
time in sec. R is Resistance and C is Capacitance which is probably is in microfarads"
"Time constant formula in a resistive inductive circuit - CORRECT ANSWER T=L/R Where T
is time in seconds, L is inductance in henries and R is reaistance"
"formula for frequency - CORRECT ANSWER f=1/T where T is time(period) in seconds"
"Effective Value (RMS) formula if given peak - CORRECT ANSWER 0.707 x peak value"
"Average Value Formula if given peak - CORRECT ANSWER .636 x peak"
"Peak value if given average - CORRECT ANSWER Peak= AVG/0.636 OR
Peak= AVG x 1.57"
"peak to peak value - CORRECT ANSWER 2x peak value"
"Peak value when given effective or RMS - CORRECT ANSWER Peak= 1.414 x Effective or
RMS"
"Peak to peak value when given RMS or effective - CORRECT ANSWER Peak to Peak= 2.828x
RMS"
"Formula for unequal resistances in a parallel circuit - CORRECT ANSWER R= 1/
1/r1+ 1/r2........."
"Formula for resistance in series parallel circuit - CORRECT ANSWER Add the resistor in
series to the total resistance of resistors in parallel"
"LULA Max Rise - CORRECT ANSWER 25 ft."
"LULA Max Speed - CORRECT ANSWER 30 ft. Min"
"LULA Max Capacity - CORRECT ANSWER 1400 Lbs."
"LULA Max Platform Area - CORRECT ANSWER 18 sq ft"
"Residential Elevator Max Rise - CORRECT ANSWER 50 ft."
"Residential Elevator Max Speed - CORRECT ANSWER 40 ft. Min"
"Residential Elevator max capacity - CORRECT ANSWER 940 lbs."
"Residential Elevator Max Platform Area - CORRECT ANSWER 15 sq. Feet"
"Lula Permanent Mechanical holding device Measurement - CORRECT ANSWER 35"-79"
above pit floors. 24" minimum above bottom sill"
"Residential elevator pit enclosure height - CORRECT ANSWER 84""
"Lula traction rope size and aircraft cable size - CORRECT ANSWER 30x diameter for traction
21x diameter for aircraft cable"
"Hydraulic LULA Overspeed valve Tripping speed - CORRECT ANSWER 110%-140%
"Pit Ladder Regulations - CORRECT ANSWER If pit extends more than 35" a pit ladder must
be present. Ladder must extend 48" above sill Ladder rungs must be at least 16" wide"
"Pit stop switch deep pit - CORRECT ANSWER Greater than 67" (deep pit) you need a second
stop switch 47" above pit floor"
"Sill guard and toe guard measurements - CORRECT ANSWER Leveling zone plus 3""
"Low voltage motor connection 9 lead - CORRECT ANSWER L1 T1-T7, L2 T2-T8, L3 T3-T
T4,T5,T6 wire nutted together"
"High voltage motor wiring 9 lead - CORRECT ANSWER L1-T1, L2-T2, L3-T
T7-T4, T8-T5, T9-T6"
"Minimum six for escape hatch - CORRECT ANSWER 40 square inches"
"Max gap leading edges of center opening doors - CORRECT ANSWER 1/2""
"Overlap minimum for horizontal sliding doors - CORRECT ANSWER 5/8""
"Vertical distance from door panel to sill - CORRECT ANSWER 3/8""
"Formula for 2 unequal resistances in parallel - CORRECT ANSWER R1xr2/r1+r2"
E=__ - CORRECT ANSWER IR"
"P=__ - CORRECT ANSWER IE"
"Pie r^2 = - CORRECT ANSWER Area of a circle"
"231 in^3 /____ - CORRECT ANSWER gal."
"25.4mm/__ - CORRECT ANSWER in."
"2.2kg/ - CORRECT ANSWER lb"
"3 phase rectifier output = - CORRECT ANSWER 1.33 x input"
"single phase output = - CORRECT ANSWER 0.9 x input"
"RMS (effective voltage) = - CORRECT ANSWER 0.707 (PEAK V)"
"TC = - CORRECT ANSWER R x C (5)???"
"RPM = - CORRECT ANSWER 60 (frequency) / (poles/2)"
"door overlap minimum = - CORRECT ANSWER 5/8" min"
"door gaps maximum = - CORRECT ANSWER 3/8" max"
"Gibs minimum = - CORRECT ANSWER 1/4" min"
"Gate Switch maximum = - CORRECT ANSWER 2""
"Passenger Sill to Sill ____ to ______" - CORRECT ANSWER 1/2 to 1-1/2""
"Platform Lift Sill ____ to _____" - CORRECT ANSWER 3/8" to 3/4""
"Moving Walk maximum = - CORRECT ANSWER 12 degree max"
"Governors (Car Trip Speed =______ & Overspeed Switch =______) - CORRECT ANSWER Car
trip speed 15-20% greater than contract speed. Overspeed Switch less than or equal to 90-95% of trip speed"
"CWT (____%) - CORRECT ANSWER Up to 10% greater than car trip speed"
“A contractor wants to raise the car speed from 100FPM to 125FPM. It currently has a 12" sheave.
What size sheave is required? - CORRECT ANSWER 15"
----Diam = 12, 12"/4=3, 25FPM=3in : 100FPM + 25FPM = 12"+3" =15"" “An MOV (metal oxide varistor) burns out. You should replace it, but cannot read the Voltage or
resistance. What should you do? - CORRECT ANSWER Replace it with a larger MOV. (630)"
“On a Ward-Leonard circuit, the brake is set, but the motor is trying to slip through the break.
What circuit is the issue? - CORRECT ANSWER Suicide Circuit. (425)"
"How is a class I (yearly) buffer test performed? - CORRECT ANSWER At slow speed and the
buffer must return in 60 sec. (555) NOTE: 5 yr Test (class 5) for car is rated load and speed and buffer returns in 90 sec., CWT is empty car at rated speed and buffer must return in 90 sec."
"How many strain supports are required on a 350 foot raceway? - CORRECT ANSWER 4, 1 for
every 100ft."
"How is stainless steel drilled out? - CORRECT ANSWER Slow speed constant pressure (205)"
"What are the required amounts of clips required for wedge shackles and what is their spacings?
CORRECT ANSWER At least 2, with the first being 4 times the diameter of the rope from the
top of shackle max and the second 8 times the diameter of the rope from the first." "A 300ohm resistor burns out. You don't have a 300ohm resistor. What can you use to make up
the resistor? - CORRECT ANSWER TWO 600ohm resistors in parallel, (600) the resistance is
the half of the highest rating in a parallel circuit. As is THREE 225ohm resistorsin parallel equal 75ohms."
"When cutting laminated panels, which direction should the finished side face? - CORRECT
ANSWER Finished face of the material should face the cutting edge of the tool (255). The blade
has a tendency to burr the back side." "A 480 vac step down 240 vac transformer is connected to a 3 phase rectifier. What will be the
output? - CORRECT ANSWER 320 vdc"
"How do you cut a finished floor material? - CORRECT ANSWER Cutting blade away from the
finish (255)"
"Car is loaded with 125% and sinks. Why? - CORRECT ANSWER Slipped through the brake"
" If you find a broken or missing barricade, what do you do? - CORRECT ANSWER Write up a
formal inspection request."
"What are the consequences of a misaligned rack and pinion hoist joint? - CORRECT
ANSWER Broken gear teeth (850)"
"If a dumbwaiter has 9 sq ft in area, 4 ft high and the rated capacity is 13.9 lb/ft3, what is the total
capacity? - CORRECT ANSWER 500 lb/ft 3 (3.2.9)
NOTE: The area of the dumbwaiter is 9 sq ft max and is 4ft high, multiply that by 13.9"
" You must enter a pit where toxic fumes are present. How do you proceed? - CORRECT
ANSWER Follow proper procedure.
NOTE: Confined space entry procedures now are guided by OSHA for pit entry." "When changing a 1:1 car rated at 600 FPM and 2000 lb capacity to a 2:1, what will the new ratings
be? - CORRECT ANSWER 300 FPM and 4000lb capacity
NOTE: Halves the speed and doubles the capacity." "A vertical platform lift has a clearance of 1 in. How much will it have to be moved to meet code?
CORRECT ANSWER 1/4 in."
"A car weighs 2500 lbs with a capacity of 2500 lbs, the CWT is weighted at 40%. How much is the
motor lifting at 100% load? - CORRECT ANSWER 1500 lbs.
2500x40%= 1000 lbs 2500+1000 = 3500 5000-3500 = 1500 lbs"
"How must oxygen and acetylene tanks be stored? - CORRECT ANSWER Must be stored
vertically 12 ft apart, or on a cart w/ a 1/2 hr fire rated barrier between them"
"What does the code state about sill to sill distance? - CORRECT ANSWER 3/4" to 1 1/2"
spacing"
" If the sill to sill distance is 1 3/4". What will bring it into code spec? - CORRECT ANSWER
"When drilling a jack hole in sandy conditions what type of drill rig is required? - CORRECT
ANSWER Rotary or Auger bit (805)
NOTE: Rotary - compacted soil, percussion - rocky conditions, and percussion rotary - solid rock" "A customer does not want an escape hatch on his residential elevator. Under what conditions is
this legal? - CORRECT ANSWER Manual operation must be provided (850)"
"You wired down direction and final limit switches. Now the car only runs up. What is the
problem? - CORRECT ANSWER You wired the down direction limit wrong."
"What are the effects of one rope sitting deeper in the sheave groove? - CORRECT ANSWER
The rope wears out and breaks faster (250)"
"Given a generator runs at 600 RPM and has 4 poles, what is the output frequency? - CORRECT
ANSWER 600/6 sec = 10 x 20 = 20hz"
"If an XOR gat was connected to a NOR gate and attached to an AND gate with a high output, what
must the input be at the XOR gate A & B? - CORRECT ANSWER BOTH must be high."
"Using binary logic, what DIP switches need to be in the on position of a 128 bit 30 sec timer set for
150%? - CORRECT ANSWER 1,3,4,6=45 sec
NOTE: 1 2 3 4 5 6 7 8
"How many traveling wires are required for the following circuit? Exclude spares. BCE-----SPI/BCD-----SP2/BCD-----SP4/BCD----UR1/BCE-----UR2/BCD-----DR1/CRE-----DR2/
GRD - CORRECT ANSWER 11
+120v___________o---- o__________R2____________A__________R1__________GRD"
"There is voltage at the switch but none at point A. What is wrong? - CORRECT ANSWER
Either open R1 or R2 (635)" "What does the square with a darkened upper triangle represent?
USE PRINT 730 TO SOLVE - CORRECT ANSWER DC Relay
NOTE: Square with lower triangle = latching relay, and square with arrow through it = timer" "The close door limit switch is not working. You have power from Term 35 to Term 8, no power
from Term 1 to S2. Why? - CORRECT ANSWER Door limit switch malfunction"
"Car is running normally but the buzzer will not shut off. Why? - CORRECT ANSWER EHP 3
to 2 shorted"
"Relay STR has voltage, TRU has voltage, RU has no voltage. Why? - CORRECT ANSWER TRU
"2nd floor PI illuminates then quickly extinguishes. Why? - CORRECT ANSWER XI 4 and 6"
"Car will not travel to 2nd floor without a 3rd floor call, and will not go down from 3rd without a
2nd floor call. What is the problem? - CORRECT ANSWER 2FI4/6"
"Using print #3, why wont the motor start? - CORRECT ANSWER MOL 1 T/B"
"The step level switch on an escalator has been activated. Where do you check? - CORRECT
ANSWER Both top and bottom (825). Step switches are manual reset switches. They are
activated if the step drops 1/4" or more."
"You get a trouble call for in-op freight door. What must you do first before you begin work? -
CORRECT ANSWER Block the door open"
"You get shocked when you attempt to move a car using a temp button for the first time. Why? -
CORRECT ANSWER You forgot to hook up a ground wire (810)"
"A motor needs a sleeve bearing replaced. What type of bearing will you need? - CORRECT
ANSWER Friction bearing (420)"
"With a 7'0" platform your inside cab wall clearance is 6'8". What is the thickness or take up of
the walls? - CORRECT ANSWER 2" thick"
"You notice rouging on the governor and tail sheave. What should you do? - CORRECT
ANSWER Check the rope diameter (250)"
"Car doors are dragging on the sill. How high should they be raised to be code compliant. -
CORRECT ANSWER 1/4""
"What type of safeties will a 300FPM car have? - CORRECT ANSWER Wedge clamps"
"Vertical platform stopping devices? - CORRECT ANSWER 2 switches, 15 lb max pressure"
"What type of oil do you need for sleeve bearings? - CORRECT ANSWER SAE 20/20w (430)"
"How do you test the safety circuit? - CORRECT ANSWER You test all switches
independently"
"What is the maximum moving walk incline? - CORRECT ANSWER 12 deg. (830)"
"How does GFI work? - CORRECT ANSWER It detects an imbalance between the hot and
neutral wires"
