Mechanics Exam Review-NEIEP Comprehensive Questions with Answers 100% Accuracy

A contractor wants to raise the car speed from 100 fpm to 125 fpm, it currently has a 12" sheave. What is required? - ANS 100 fpm/125 fpm= 12"/ X =15 A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do? - ANS 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 brake. What is the issue? - ANS Suicide Circuit - 425 You have an old DC motor and are adding an SCR drive, what do you do to the interpoles? - ANS Leave the interpoles alone. When adding a SCR drive to the generator, the series loop is removed, as are the 3 resistors. Everything else remains the same A hydro runs up with no load but will not run with a full load. What is the issue? - ANS The relief valve is set too low - 815 Runby for a 1:1 hits the CWT buffer 4" below the top landing. CWT runby should be set at 18". How much should the ropes be shortened? - ANS 22" - 235 You need to work on a freight door retiring cam, you LOTO the main line but there is still power on the cam. What circuit is still hot? - ANS Door Operator disconnect -535 The contractor requests that the vertical center of a Rack and Pinion hoist be moved. How do you do this? - ANS Adjust tie downs and wall ties - 850 Working pressure on a Hydro is 400 PSI. What is the maximum relief valve setting? - ANS 400 x 150%= 600 PSI - 815 What must be installed on a false care before operation? - ANS Spring Loaded safeties - 110 There is slight arcing between the brush and commutator. What action must be taken? - ANS 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? - ANS 18,000lbs -210 How much resistance is measured over a normally closed switch? - ANS .2 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? - ANS traveling cable has a cut/exposed wire or a short - 515 How is a class 1 yearly buffer test preformed? - ANS 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? - ANS 4 1 every 100ft - 505-510 How is stainless steel drilled out? - ANS Slow speed and constant pressure - 205 What is the required amout of retainer clips for wedge shackles and what is the spacing? - ANS 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? - ANS 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? - ANS Finish side facing the cutting edge of the tool. Blade will burr the backside. - 225 How do you cut a finished floor? - ANS 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? - ANS 320 VAC 3 phase full wave= 1.33 x output voltage. - 715 A car is loaded with 125% and sinks, why? - ANS Slipping through the brake IF you find a broken or missing barricade what should you do? - ANS Write up a formal inspection request What are the consequences of misaligned joints on a rack and pinion? - ANS Broken gear teeth. CWT derailment. Excessive wear/crease the surface of the tube. - 850 A dumbwaiter is 9 sqft in area, 4 ft in height, and capacity is 13.9lb/ft. What is the total capacity? - ANS 9 X 4 x 13.9= 500lbs Max Capacity You must enter a pit with a toxic atmosphere, how do you proceed? - ANS Follow proper OSHA procedure with proper training and PPE - 133 When changing a 1:1 car rated at 600fpm and 2,000lb capacity to a 2:1, what are the new ratings? - ANS 300 fpm with 4000lbs capacity. Half the speed and double the capacity. A vertical platform lift has a clearance of 1 inch. How much will it have to move to meet code? - ANS Move in 1/4 inch. Code is 3/4 in A car weighs 2500lbs with a capacity of 2500lbs, The CWT is weighted 40% , how much is the motor lifting when the car is fully loaded? - ANS 2500 (CAR) + 1000 ( 40%)= 3500lbs = 1500lbs lifted by the machine - 240 How must Oxygen and Acetylene tanks be stored? - ANS Vertically, 12 feet apart, or on a cart with a ½ hour fire barrier between them What is code for sill to sill distance? - ANS Minimum- 1/2 in Maximum- 1-1/2 in - 525 When drilling a jack hole in sandy conditions what type of drill rig is required? - ANS Rotary or Auger bit Note: Rotary=soft Percussion= rocky Combo= solid - 810 A customer does not want an escape hatch on a residential elevator, under what condition is this legal? - ANS Manual operation must be provided - 840 Your helper wired the down direction and final limit switches, now the car will only travel up, what is the issue? - ANS The down direction limit was wired incorrectly What are the effects of one rope sitting deeper in the sheave groove? - ANS The rope wears out and the breaks faster - 245 There is a noise coming from a freight door. The sheave is moving, but the chain is not. What is the problem? - ANS Oil on the drive chain - 535 What is the effect when you change a sling angle from 60 degrees to 30 degrees? - ANS More tension, less capacity. Any angle 30 degrees or less is dangerous - 100 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? - ANS 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? - ANS 1" = 25.4 mm You open a dumbwaiter access panel and it still runs, what is the problem? - ANS 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? - ANS Cylinder leak - 805 Where should you aim a fire extinguisher to put out a fire? - ANS 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? - ANS The call is bypassed until the car is traveling in the UP direction - 740 During construction you land an escalator, but it is 10 mm low, what is wrong? - ANS The pit is too deep or column MARK is off - 825 During construction the Omega CWT rails have been damaged, what happened? - ANS The omegas were over tightened - 215 How do you handle a co worker who shows up drunk? - ANS Speak with MIC, Call BA, Call supervisor - 100 How do you attach brackets to brick? - ANS Inserts set back a ¼ inch into the block. Code could call for through bolts What is Selective Collective System? - ANS Controller that allows an elevator to bypass calls in the opposite direction of travel. - 740 Generator runs at 600 rpm and has 4 poles, what is the output frequency? - ANS (RPM/60sec) x ( # of poles/2) (600 rpm/60sec) x (4/2)= 20hz If a XOR gate was connected to a NOR gate and attached to an AND gate with a High output. What is input of the XOR gate A&B? - ANS Both must be high - 645 Using BINARY logic, what DIP switches must be on for a 128 bit 30 second timer set at 150% - ANS Note: 1 2 3 4 5 6 7 8 = on or off Note: 1 2 4 8 16 32 64 128 = number of seconds Note: 32 + 8 + 4 + 1= 45 seconds 1, 3,4,5,6= 45 seconds How many wires are needed for the following circuit? Exclude Spares BCE---SPI/BCD---SP2/BCD---SP4/BCD-BCE---UR2/BCE---DR1/CRE---DR2/GRD - ANS 11 wires no need for duplicate wires How must a 9 lead 480/240 motor be wired for High Voltage? - ANS L1 ( 1,7) L2 ( 2,8) L3 (3,9) wire nut together (4,5,6) There is voltage at the switch, but none at A, what is wrong? - ANS Open at R2 or R1 - 635 What does a square with a darkened upper triangle represent? - ANS DC Relay Note: Square with a darkened lower triangle = latching relay Note: square with arrow through it = timer relay - 730 The close door limit switch is not working, you have power at points 35-8, no voltage at 1-S2 why? - ANS Door limit switch malfunction- *Sheet 1 730 prints* Car is running normally, but the Fire Service buzzer will not shut off, Why? - ANS EHP 3-2 shorted *Sheet 2 730 prints* Relay STR has voltage, TRU has voltage, RU no voltage, why? - ANS TRU 9/8 open * Sheet 3 730 prints* 2nd floor PI lights then quickly shuts off, why? - ANS X1 4-6 * Sheet 2 print 730 * Car will not travel to 2 without a 3 call, and will not go down to 3 without a 2 call? - ANS 2 F1 4-6 * Sheet 1 print 730* Using sheet 3, why wont the motor start? - ANS MOL1 T/B * Sheet 3 print 730* The step level switch on an escalator has been tripped, where do you check? - ANS The upper and lower truss assemblies, trips if the step sags more than 1/8 inch. - 825 You get a trouble call for an inoperable freight door. What must you do before you begin work? - ANS Block open the door, LOTO, and barricades - 540 You get shocked when attempting to move a car with a temp run bug, what is the problem? - ANS Ground wire not hooked up - 810 A Motor needs a sleeve bearing replaced, what type of bearing do you need? - ANS Friction bearing AKA sleeve bearing - 420 With a 7 foot platform, your inside cab wall clearance is 6'8". What is the thickness or take up of walls? - ANS 2 inch thick walls You notice Roughing on the Gov and Tail Sheave. What should you check? - ANS Rope diameter - 250 Car doors are dragging in the sill, how high should the car doors be above the sill? - ANS 1/4 inch - 525 What type of safeties are required on a 300fpm car? - ANS Type B wedge clamp - 240 What stopping devices are required on vertical platforms? - ANS 2 pan switches. 15lbs max pressure What type of oil is required for sleeve bearings? - ANS Single viscosity SAE 20 What is the maximum inclination for moving walks? - ANS 12 Degrees - 830 How does a GFCI work? - ANS Detects imbalance between hot and neutral - 205 What is required to provide MSDS or SDS for a solvent you are using? - ANS Your Employer - 100 How do emergency doors swing? - ANS Outwards You have an EMT run with 3-90s, 2-45s, and a saddle bend. What is required? - ANS An intermediate pull box. 360 degrees is the most bends for a continuous pipe run. - 505 What is the maximum distance between vertical race way supports? - ANS 15 feet - 505 What is the smallest wire used inside travelers and outside travelers? - ANS # 20 awg and #24 awg - 505 What is the maximum distance between strain relief supports? - ANS 100 ft - 510 What is the maximum length motor-generator leads can be outside of a controller? - ANS 6 feet - 505 In what section of NEC is elevator, escalator, moving walks and dumbwaiters? - ANS Article 620 - 505 What is the ratio between the loop and diameter of a round traveler? - ANS 30 times - 515 What are the most common features of a load weigh? - ANS Control generator field and inside express operation - 515 What is required by ASME on the car top? - ANS Inspection station, Light, and Duplex outlet. - 515 At what distance from closed does the gate switch operate? - ANS 2 inches - 515 What is the minimum number of spares that should be pulled? - ANS 10 % - 515 At what speed should the governor switch contact be set to open? - ANS Electrical 90% of tripping speed for 150-500 fpm / 95% of 500 + fpm If the DC output of a 3 phase rectifier is lower than specified, what is the problem? - ANS AC fuse is blown. 1 Input phase is missing - 715 What is the overlap minimum on 2 and 3 speed doors? - ANS Horizontal- 1/2 inch Vertical - 1 inch What are minimum and maximum clearance between sill and car doors? - ANS 1/4 inch minimum 3/8 inch maximum - 530 What is maximum leading edges for center opening doors? - ANS 1/2 inch - 530 What is minimum sill to gib engagement? - ANS 1/4 inch - 530 What is minimum and maximum sill to sill gap? - ANS Minimum- 1/2 inch Maximum- 1-1/2 inch - 525 1 gallon equals how many cubic feet? - ANS 231 -815 How many gallons are need to run a 6" plunger 30'? - ANS Area= 3.14 x R2 = 3.14 x6=18.84 Height= (12"x30')=360" Volume= Area x Height= 18.84 x 360"=6782.4 A force of 5,000lbs is applied to a plunger with an area of 25 sq in. What is the system pressure? - ANS Pressure= Force/ area Area= Force/pressure 5000 lbs/25 sqin= 200 psi - 815 What best describes the operation of a typical hydro block valve with elevator parked at the lobby? - ANS Down valve: Closed Check valve: Closed Up Valve: open What is the definition of working pressure? - ANS Fully loaded to capacity, Full speed running up - 815 What is the conversion for kg to pounds? - ANS 1 kg = 2.205 lbs On a geared machine the worm and worm gear are made out of what materials? - ANS Steel and Bronze What is the purpose of a gear reduction unit on a geared machine? - ANS Increased lifting capacity What holds a stopped Hydraulic elevator? - ANS Check valve What must be done if you get on top of a dumbwaiter? - ANS Never fully get on top. Work only partially on with the mainline disconnect off. How do you measure an escalator handrail? - ANS 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? - ANS 12 degrees for a moving walk 31 degrees for an escalator In a Ward-Leonard system, if all 3 contacts close what will happen? - ANS The car run at full speed - 415 What type of oil do you put in the machine? - ANS Gear oil, non-detergent, single viscosity A 75 ohm resistor has blown, no replacement, how do you fix it? - ANS 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? - ANS Set the safeties What are extension tubes used for? - ANS Necessary clearance for placement of concrete forms. If a hoist motor is making noise, what is the problem? - ANS 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? - ANS Pie x Radius Squared= Area 3.14x5x5=78.5 The escape hutch opens in what direction? - ANS 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? - ANS The elevator abstract. Rails, lanterns, push buttons, etc. and quantity, color, material, etc You have to order P.I. for a 12 stop building with 3 cars. 3 floors do not have P.I. What is the total number of P.I. you need to order? - ANS 12x3= 36 floors 3 floors with no P.I.=9 36-9 =27 P.I. needed If an elevator travels 1760 rpm @60 hz, how many hz needed to run at 600 fpm? - ANS 20 hz You see a saw tooth wave form when using an oscilloscope out of the encoder, is that good? - ANS No What are the hand signals for crane operation? - ANS Thumbs out= Boom out, Thumbs in= Boom in; Thumb up= Boom up, Thumb down=Boom down; Finger up clockwise= Hoist up, Finger down counterclockwise= Hoist down; Arm out= Stop You are working on a MOD and have to move the controller to 30 feet farther away, you notice voltage drop, what can be done to increase voltage? - ANS Use a larger gauge wire What is the weight of 15 full 16' rails and 2-8' normal rails? - ANS 16 x 16' x 15 lbs= 3840 lbs What is an acceptable substitute for the top rail of a barricade? - ANS 1/4 inch thick wire rope What is the proper way to test incoming voltage? - ANS 3 phase AC using digital meter: L1-L2, L1-L3, L2-L3 Hydro at pump starter. Traction at L1, L2, L3 When replacing a PCB in a controller what precautions must be taken? - ANS Use a grounding wrist strap, and never remove anything with the power on Who gives you a right to a safe work space? - ANS OSHA On an ANNUAL static load test, the car drifts down 15" in 10 minutes. There is no visible oil in the pit, where is the leak coming from? - ANS Underground. Annual static test required for unexposed cylinders What training must be done before you can enter a pit that has been classified as a confined space? - ANS Confined space entrant training Traction and Hydraulic machines have many hazards, what is most dangerous? - ANS Rotating equipment You are installing a machine and sheave, where would machine and secondary sheaves be aligned? - ANS In the center of the rail measurements You are testing an elevator with a rated speed of 500 fpm. What is the minimum speed the safeties should set at? - ANS Mechanical: 115% x 500= 575 fpm Electrical: 90% x 575= 517.5 fpm What is one of the most dangerous hazards in the trade and most obvious for us? - ANS Falls You are installing machines, governors, and generators, and need to know the location where it needs to be installed. Where would you find the information? - ANS The machine room plan view What is the minimum breaking strength of a wire rope used as life safety? - ANS 5,000 pounds What is known as the silent killer? - ANS CTW You go to a trouble call and the building owner keeps asking when the car will be back up and if you can take any short cuts to get it up faster. what is your response? - ANS Give a reasonable response on time and safety factors. If that doesnt work he can **** off You are preparing to replace a resistor on an out of service car. What is the 1st thing to do? - ANS Make sure it is LOTO and verify no voltage What are 3 major factors in hydraulic pit maintenance? - ANS Oil, tripping hazards, electricity What is the tolerance for 3/8 at .003? - ANS .372- .378 bilateral= 2 direction unilateral= 1 direction You are installing push buttons using snake eye screws. What type of screwdriver? - ANS Tamper proof You are working with eye bolts, where would you check for lifting capacity? - ANS 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? - ANS 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? - ANS Cup screw You have to measure the outside of a pipe. What tool would you use? - ANS Caliper Rule You are installing spring buffers on a 200 fpm car, what is the minimum buffer stroke? - ANS 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? - ANS Ring test How often do electrical cords need to be checked for continuity? - ANS Every 3 months The DBG is 6'6" using 15 lb rails with 1/4 shim on the brackets, what is DBB? - ANS (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 1/2 inch How does OSHA classify a competent person? - ANS One who is capable of identifying existing and potential hazards, and who has authorization to take prompt, corrective measurements Car weighs 7,000 lbs with a capacity of 3,500 lbs. What does the CWT weight? - ANS 3,500 lbsx 40%= 1400 lbs 7000 lbs + 1400 lbs= 8400 lbs You are stacking rails in a single hydro hoist way, with a rise of 48' how many rails will you need? - ANS 48'/ 16' = 3 rails per side 3 x2 sides= 6 rails Installing a 3,000 lb capacity car, how much load will the break stop and hold? - ANS 125% of rated capacity= 3000 lbs x 125%= 3,750 lbs On traction elevators where are the bottom guide shoes mounted? - ANS To the safety plank You have a hoist rated at 3,000 lbs, if you use a double block to single block reeving, what would your total lifting capacity be? - ANS 6,000 lbs You need to find the DBG for the car, where would you find this information? - ANS Final layout or hoistway plan view drawing You are hoisting rails into the hoist way using a capstan hoist, your apprentice is having a hard time pulling in rails. What can be done to make it easier? - ANS Add another or more wraps to the capstan hoist Responding to a call on a hydro, you determine that the 50 amp circuit breaker that feeds the controller has tripped. What component of the elevator has the ability to cause this problem? - ANS The pump motor The motor field windings on a DC motor are wound around a laminated core. The composition of the core material is dependent upon which characteristics? - ANS Permeability: ability of a substance to pack magnetic lines of flux in a space You suspect a phasing issue with building power. Which controller device should you check first? - ANS Reverse phase relay: detects incoming power loss of phase or phase reversal How do you measure AC voltage on a digital multimeter? - ANS Function to VAC Red lead to volt ohm Black lead to common Sometimes necessary to increase output of a DC generator to over speed an elevator as part of the safety test. If maximum output is reached an speed cannot be increased, it is said to be what? - ANS Saturated: cannot produce any more magnetic lines of flux What hydro piece uses electrical power using the principle of electromagnetism? - ANS Hydro Valve Solenoid: electro- mechanical device operated by a coil and having an iron core steel plunger as an armature Which of the following maintenance procedures addresses the issue of proper DC generator commutation? - ANS Continued contact between brushes and commutator Customer is complaining that an older SCR drive powered elevator, is causing noise in the building power lines. What can help reduce the noise? - ANS Isolation transformer is used to minimize electrical noise reflected to supply lines In a series circuit with a 10K ohm resistor and a 2mA current, what is voltage? - ANS E= R x I= E = 10000 ohm x .002A= E =20v How would you connect an ohm-meter to check load resistance? - ANS Black to common, Red to V, ohm switch at Ohm. No power, take one lead off, connect in parallel, analog needs to be zeroed Exciter voltage comes from what source? - ANS Generator Youre pulling (15) #14 awg, (27) #16 awg, (57) # 18 awg wires. How many spares needed? - ANS (2) # 14, (3) # 16, (6) #18 = 10% spares required You have (26) 16' 22 lb rails and (2) 8'22 lb rails, what is the total weight of the rails? - ANS 27 rails x 16' x 22 lbs= 9504 lbs You need to replace an unmarked single phase transformer with primary voltage at 220 vac current at 5 amp. What size would you need to double it? Note: kVa sizing must be calculated from primary or secondary volt + amp info - ANS 2.2 kVa You have attempted to start up a 3 phase AC motor and stalls then hums or growls? - ANS If the rotor bar becomes loose at the ring connection, or if the rotor bar cracks, current cannot flow through the bar, and the entire rotor is disrupted, causing loud growl or humming sound Your fluke digital multimeter reads 440 vac, what value are you reading? - ANS 440 vac RMS You have determined that the period of an oscillation that you can feel in the car is .5 seconds. What is the frequency of the oscillation? - ANS 2 hz frequency from time or period F=1/T F=1/.5= 2hz Customer complains that elevator is having door problem at every floor. Where do you start trouble shooting? - ANS The car doors Freight doors are binding because they are hanging out of square, what adjustments can you make? - ANS 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? - ANS Using a plumb bob, snap the line, and measure off of the rail When installing multiple traveling cables, where is the first cable located? - ANS First is closest to the rail 2 controllers in a small machine room face each other, what is the minimum clearance between them? - ANS 36 inches When installing travelers, what is the minimum length of vertical suspension at both ends before the loop starts? - ANS 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? - ANS Change the phase sequence You receive a call that a center opening car is running with one door partially open, how is this possible? - ANS 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? - ANS 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? - ANS Column line Escalator demarcation lights are required by code for what reason? - ANS 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? - ANS 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? - ANS 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? - ANS 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? - ANS Reverse any 2 leads of incoming motor phases Before you can move a piston on a hydro, what precautions must be taken? - ANS 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? - ANS 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? - ANS 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? - ANS 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? - ANS 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? - ANS 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? - ANS 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? - ANS 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? - ANS 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? - ANS The primary safety circuits You just pulled multi-cables down the hoistway of a high rise. How should you provide strain relief for the cables? - ANS Required every 100'. Begin at the lowest and work upwards to adjust tension Installing horizontal sliding doors with guides in each door panel, how far must each guides engage the sill gauge? - ANS 1/4 inch Your supervisor informs you to change software on a hydro microprocessor board. The software is a 24 pin DIP package. To properly orientate the new chip on the board, what must you do? - ANS Verify that the notch on the dip chip matches the notch on the board You need to speed up an AC motor that has a fixed number of poles. How can you speed it up using the RPM formula? - ANS Change the frequency. RPM= 60 x F/ P/2 You have finished digging a hole hydro, the jack is not on site. What must the hole have on it before you leave? - ANS A welded cover A CWT frame weighs 10,000 lbs and needs to be increased by 5%. What is the new weight of the frame? - ANS 10,500 lbs You have 32' of rise in scaffolding and are using a 3' x 5' base. Where are the tie offs? - ANS 1st at 12' and cannot be more than 26' apart vertically 30' apart horizontally How is a step level switch on an escalator reset? - ANS Manually What is the law of power? - ANS P= E x I What is the maximum voltage drop that can occur across a 500 watt resistor carrying 2 amps of current? - ANS E= P/I E= 500 watt/ 2 amps= 250 volts While testing for a locked rotor condition, what could happen if the testing was carried on for too long? - ANS Damage to the stator or rotor What is needed to coordinate the movement and to dispatch hall calls? - ANS A group controller Where is weight added on a freight door for balancing? - ANS On the top What door is heavier on bi-parting freight doors? - ANS The lower door because of the tucking sill What happens to the break when contact E opens? - ANS 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? - ANS 5TC