Mechanics Exam Questions With 100% Correct Answers 2023-2024, Exams of Advanced Education

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Mechanics Exam Questions With 100%

Correct Answers 2023-

** An MOV burns out, you replace it but cannot read voltage or resistance. What should you do? - Correct Answer-Replace it with a larger one (630)

• On a Ward-Leonard circuit, the brake is set but the motor is trying to slip through the brake. What circuit is the issue? - Correct Answer-Suicide circuit (425) ** A Hydro runs up with no load but does not run up with a full load. What is the issue? - Correct Answer-The relief valve is set too low (805) ** Runby for a 1:1 car hits the CWT buffer 4" below the top landing. The CWT runby should be set at 18". How much should the ropes be shortened? - Correct Answer-22" for 1:1. For a 2:1 with the same issue is 44". ** You need to work on a freight door retiring cam. You LOTO the mainline disconnect but there is still power to the cam. What circuit is still hot? - Correct Answer-Mainline disconnect (535) ** The contractor requests that the vertical center of the Rack and Pinion hoist be moved. How is this accomplished? - Correct Answer-Adjust Tie downs/Wall ties (805) ** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? - Correct Answer-600 PSI Max. (805) 400 psi x 150% = 600 psi ** A contractor wants to raise the car speed from 100 FPM to 125 FPM. It currently has a 12" sheave. What size sheave is required? - Correct Answer-15" (125 /100 = 1.25 1.25 x 12 = 15) ** There is slight arcing at the Brushes and Commutator. What actions must be taken? - Correct Answer-None. (430) "Heavy arcing is due to light brush pressure. Mechanical wear indicates heavy brush pressure. ** How much resistance is normally measured across a normally closed switch? - Correct Answer-1.2 ohms or 1 to 2 ohms ** A car traveling in the hoistway always stops at the same point and blows a fuse. What is the problem? - Correct Answer-Traveling cable has a cut or short

** How is a Class 1 (yearly) buffer test performed? - Correct Answer-At slow speed and the buffer must return in 90 seconds. (555) *(60 seconds is acceptable) (90 seconds is code) 5 year test (Class 5) is car at rated load and speed. Buffer must return in 90 seconds. CWT at rated speed and buffer must return in 90 seconds. ** How many Strain Supports are required on a 350' raceway? - Correct Answer- One for every 100' ** How is Stainless steel drilled out? - Correct Answer-Slow speed and constant pressure (205) ** What are the required amount of clips for Wedge Shackles and what is their spacing?

• Correct Answer-At least 2, with the first being 4 times the diameter of the rope from the top of shackle. Second is 8 times the diameter of the rope from the first. ** Car is loaded with 125% and sinks. Why? - Correct Answer-Slipped through the brake. ** A 300 Ohm resistor burns out. You don't have a 300 Ohm resistor to replace it. What can you use to make up the resistor? - Correct Answer-2 600 Ohms resistors in Parallel. "The resistance is half of the highest rating in a parallel circuit. 3, 225 Ohm resistors in parallel equal 75 Ohms. ** A 480 VAC Step Down Transformer is connected to a 3 phase rectifier. What will the output be? - Correct Answer-320 VDC 480 - 33.33% = 320 ** If you find a broken or missing barricade, what do you do? - Correct Answer-Write up a formal inspection request. ** If a Dumbwaiter has 9 square feet in Area, 4 ' High and the rated Capacity is 13.9 lb/ft3, what is the total capacity? - Correct Answer-500 lb/ft3. "The area of a Dumbwaiter is 9 sq' max and is 4' High. Multiply that by 13.9. 9x4 = 36. 36 x 13.9 = 500 ** What are the consequences of a misaligned Rack and Pinion hoist joint? - Correct Answer-Broken Gear Teeth (850) Motor not aligned. ** You enter a Pit where toxic fumes are present. How do you proceed? - Correct Answer-Follow proper procedures. "Confined Space entry procedures are now 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 4000 lb capacity. "Halves the speed and doubles the capacity ". ** A "Vertical" platform lift has a clearance of 1". How much will it need to be moved to meet code? - Correct Answer-Deduct 1/4". ( 3/4" ) is needed. ** A car weighs 2500 lbs with a capacity of 2500 lbs. The CWT is weighed at 40%. How much is the motor lifting at 100% load? - Correct Answer-1500 lbs 2500 x .40 = 1000 lbs 2500 + 1000 = 3500 lbs 5000 - 3500 = 1500 lbs ** When drilling a Jack Hole in sandy conditions, what type of drill rig is required? - Correct Answer-Rotary or Auger bit (805) Rotary = Compacted soil Percussion = Rocky conditions 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 the 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) ** There is a noise coming from a freight door. The sheave is moving but the chain is not. What is the problem? - Correct Answer-Oil on on the chain ** What is the effect when you change a sling angle from 60* to 30* when hoisting and rigging? - Correct Answer-More tension, less capacity. ** How many points of contact must be maintained on a ladder? - Correct Answer- points at all time.

• What is the conversion formula when measuring Inch to MM? - Correct Answer-25. Inch to MM (.03937) 2.54 Inch to CM (.3937) ** You open a Dumbwaiter access panel and it still runs. What is the cause? - Correct Answer-Pit Access switch is not working. (550)

** You perform a static load test with the pit valve in the closed position. The car sinks 6" in 15 minutes. What is the cause? - Correct Answer-Cylinder leak (520) ** Where should you point the fire extinguisher when putting out a fire? - Correct Answer-At the base of the fire ** A car with a "Selective Collective" controller is moving to the lobby to pick up a call. An up call is put in at the second floor. What happens? - Correct Answer-Call is bypassed till the car is moving in the up direction. ** During construction, you land an escalator but it is 10mm to low. What is wrong? - Correct Answer-Pit is too deep or Column Mark is off. (825) ** During construction, the Omega CWT rails have been damaged. Why? - Correct Answer-Overtightened from rail bracket. (215) ** How do you attach brackets to brick/concrete blocks? - Correct Answer-"Inserts" 1/4" back from brick/concrete blocks ** Given a generator that runs at 600 rpm and has 4 Poles, what is the output frequency? - Correct Answer-600/60seconds = 10x2 = 20 HZ ** If an Exclusive OR gate was connected to a NOR gate and attached to a AND gate with a high out put, what must the input at the Exclusive OR gate A and B be? - Correct Answer-Both must be high ** Using Binary logic, what DIP switches need to be in the " On" position of a 128 bit 30 second timer set for 150%? - Correct Answer-1,3,4,6 = 45 ** How must a 9 lead 480/240 motor be wired for low voltage setting? - Correct Answer- L1 (1,7). L2 (2,8). L3 (3,9). (4,5,6) ** What does a square with a darkened upper triangle represent? - Correct Answer-DC Relay Square with lower triangle = Latching Square with an Arrow through it = Timer ** 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. (810)

• A motor needs a sleeve bearing replaced. What type of bearing will you need? - Correct Answer-Friction Bearing (420) ** With a 7' platform, your inside 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 the be raised to be code compliant? - Correct Answer-1/4" ** What type of safeties will a 300 fpm car have? - Correct Answer-Wedge Clamps ** "Vertical" platform stopping devices? - Correct Answer-2 Switches. 15lb Max pressure. ** What type of oil do you need for Sleeve Bearings? - Correct Answer-SAE 20/20W ( Single Viscosity Oil ) ** How do you test the safety circuit? - Correct Answer-You test all switches Independently. ** What is the maximum "Moving Walk" incline? - Correct Answer-12 degrees. (830) ** How does a GFCI work? - Correct Answer-It detects an Imbalance between the Hot and Neutral wires. ** Who is required to provide you with the MSDS or SDS of a solvent you're using to clean rails? - Correct Answer-Your Employer (105) ** How do Emergency Doors swing? - Correct Answer-Outward. ** You have to run an EMT run with 3 - 90s, 2 - 45s and a Saddle bend. What will be required? - Correct Answer-An Intermediate Pull Box. No more than 360 degrees.
• What is the Max distance between Raceway supports? - Correct Answer-15'
• What is the Max distance from Strain Bars? - Correct Answer-100' ** What is the ratio between diameter and Loop of a Traveler? - Correct Answer- times.

** What is the minimum amount of Spares that should be pulled? - Correct Answer-10% ** At what speed should the Governor Switch contact be set to open? - Correct Answer- 90 - 95% of Governor tripping speed.

• What is the Max clearance between Door and Sill? - Correct Answer-3/8". (1/4" - 3/8") ** What is the minimum Gib to Sill? - Correct Answer-1/4"
• What is the minimum gap Sill - Sill? - Correct Answer-1/2" ** What is the Max gap Sill - Sill? - Correct Answer-1 1/2"
• A Force of 5000 lbs is applied to a plunger with an area of 25 sq inches. What is the system pressure? - Correct Answer-200 psi. (5000 lbs/ 25 sq inches = 200 psi ** How many gallons are needed to run a 4" plunger 25'? - Correct Answer-16.3 gallons (V = A(H)
• In Bi-Parting doors, what gap is allowed before Gate switch is opened? - Correct Answer-3/4" Max ** What do you do before running a Hydro elevator after the car is built? - Correct Answer-Check piston for debris and make sure Head is tight.
• What is going on if you add power to a generator but motor doesn't gain more speed?

• Correct Answer-Generator is Saturated.

• What is Relief set at? - Correct Answer-150% ** What is the Maximum door closing force? - Correct Answer-30 lbs (7 lb Kinetic Force) ** What do you do before replacing a relay on a controller? - Correct Answer-Turn power off and Lock our Tag out
• When are Oil Buffers required? - Correct Answer-Above 200FPM
• What amount of Crosby's do you use on 1/2" rope? - Correct Answer-
• SCRs are good for what? - Correct Answer-They are quieter and cause less vibration than an MG Set. ** If rigging a motor into the Overhead, what type of rigging to prevent it from spinning? - Correct Answer-Hoisting Jack

• If changes need to be made during construction, who do you inform? - Correct Answer-Mechanic In Charge ** If you get a complaint that all floors make noise, what should you check first? - Correct Answer-Car doors ** What must a Pit have? - Correct Answer-Stop Switch and Pit Light. *If a Handrail Switch is tripped and you reset it but the escalator immediately turns back on, what is the problem? - Correct Answer-The Start Switch is stuck in an "On" position. RPM formula? - Correct Answer-60 x F (N/2) Example: what is the rotating speed of a three phase 30 HZ 6 pole motor? 60 x 30hz = 1800 1800 •/• 3 poles = 600RPM ** How do you get rid of stress on cables? - Correct Answer-Let them hang and unwind.
• ADA height for a new Hall Fixture? - Correct Answer-42" to center of fixture *What item is Electromechanical? - Correct Answer-Valve Solenoid ** What is a safety concern while working on a Hydro? - Correct Answer-Mechanical equipment (Belts) (Car drops on gravity. Car drops with no power applied)
• What is the Silent Killer? - Correct Answer-Counter weights ** What is the minimum size for an Escape Hatch? - Correct Answer-400 square inches
• What do U grooves need? - Correct Answer-Double Wrap
• You have an old DC motor and you are adding an SCR Drive. What do you do with the Interpoles? - Correct Answer-Leave the Interpoles alone. (When adding an SCR Drive to the generator, the Series Loop is removed, as are the three resistors.
• 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 backside. ** How must Oxygen and Acetylene tanks be stored? - Correct Answer-Must be vertically 12' apart or on a cart with a 1/2 hr fire rated barrier between them.
• How do you handle a coworker who shows up to work intoxicated? - Correct Answer- Speak to the MIC, Union BA or call your Supervisor. ** What is a Selective Collective control system? - Correct Answer-A controller that allows an Elevator to Bypass calls in the opposite direction of travel.

** What is the smallest wire permitted in an Elevator install? - Correct Answer-# 24 gauge.

• In what section of the NEC is Elevator, Escalator, Dumbwaiter and Moving Walks found? - Correct Answer-
• What is the Max length Motor- Generator leads can be to the controller without a raceway? - Correct Answer-6'
• What is the smallest wire allowed in a Traveling cable? - Correct Answer-# 20 Gauge
• What are the most common features of Load Weigh? - Correct Answer-To control the Generator field and express operation.
• What is required on the Cartop by ASME? - Correct Answer-Inspection Station, Light, Duplex receptacle. ** If the DC output of a 3 phase rectifier is lower than specified, what is the problem? - Correct Answer-One Input phase is missing.
• What is the Overlap minimum on 2 and 3 speed doors? - Correct Answer-5/8" ** What is the Max gap of the Leading Edges of Center opening doors? - Correct Answer-1/2"
• 1 gallon is how many cubic inches? - Correct Answer- ** What best describes the operation of a typical Hydro Block Valve with an Elevator parked at the lobby? - Correct Answer-The Down Valve is closed. The Check Valve is closed. The Up Valve is open. *What is the definition of Working Pressure? - Correct Answer-Full Load Up pressure
• What is the conversion from Kilograms to Lbs? - Correct Answer-1 Kilogram = 2.2 lbs Ohms Law - Correct Answer- Circuit Symbol - Type of Gate - Logic Characteristics - Correct Answer- Rules for Series Circuits - Correct Answer- Rules for Parallel Circuits - Correct Answer- AC Sine wave Frequency and Period - Correct Answer-

AC Sine Wave "Effective Value" - Correct Answer- AC Sine Wave "Average Value" - Correct Answer- AC Sine Wave "Peak Voltages and Currents" - Correct Answer- Mechanical and Electrical Degrees - Correct Answer- Ohms Law for AC "Phasing" - Correct Answer-

• When are comp ropes (instead of comp chains) required? - Correct Answer-700 FPM ** What diameter cable can be used as a handrail? - Correct Answer-1/4" steel cable 3 phase rectifier Output? - Correct Answer-1.33 x Input Single phase rectifier Output? - Correct Answer-0.9 x Input Rated speed? - Correct Answer-Full speed no load
• Time constant question on test? - Correct Answer-45 seconds ** How much weight to add to cwt question on test? - Correct Answer-11 plates ** Inverting OpAmp - Correct Answer-Analog Inverting SCR - Correct Answer-Forward Biased ** Sparking on generator? - Correct Answer-High Mica ** Dumbwaiter takes off while loading, why? - Correct Answer-Non-Interference not working ** What can AC generator Interpoles reduce? - Correct Answer-Armature Reaction ** Capacitor microfarad discharge question on test? - Correct Answer-5 seconds ** 3rd floor bulb burned out question on test? - Correct Answer-Shorted resistor If you are testing a circuit with a multimeter, what voltage reading would you expect to have when connected to C and E? - Correct Answer-120 VAC How do the relay contacts in figure 15 reverse the direction of this 3 phase motor? - Correct Answer-By reversing L1 and L

You are required to adjust the brake shown in figure 26. For a slower drop, which of the following adjustments should be made? - Correct Answer-Move BD resistor tap to the left Refer to figure 22. If the brake contact E fails to open when the brake coil is energized, what will happen? - Correct Answer-The brake coil current will be unchanged Refer to figure 28. You observe that the brake time has shortened, preventing the car from leveling properly. Which of the following would cause this condition? - Correct Answer-Diode open ** You need to replace a 3 phase , 60 cycle AC motor which is missing the data plate that once showed the RPMs. If you know the old motor had 6 poles, what is the approximate RPMs the replacement motor will be rated for? - Correct Answer- ** If a rectifier with a 220 VAC input blows its 200 microfarad 300 VDC filter capacitor, what is the problem? - Correct Answer-Intermittent high output current ** What do you use to keep a machine from moving side to side? - Correct Answer-Kick Angle

• What do you hold a machine beam down with? - Correct Answer-Tie downs
• What is the strongest type of rope? - Correct Answer-Seale rope You are using a 4K capacity hoist reeves 4:1 what is the Max you can lift? - Correct Answer-16k ** What is the boom out signal? - Correct Answer-Arms out, thumbs out
• If there is high screeching, what should you check? - Correct Answer-SCR drive motor bushing ** You get to a job where there is low voltage to a motor after a MOD, during which the mainline disconnect was moved 30' away. What is the fix? - Correct Answer-Increase wire size ** If a traveler is 1.25" in diameter, what is acceptable for a loop? - Correct Answer-1. x 30 = 37.5 (30 x diameter) ** Call cannot go to 2nd floor without 3rd floor call but won't go down from 3rd without 2nd floor call, what's the problem? - Correct Answer-2 F1 4/ ** 2nd floor PI turns on then quickly extinguishes, why? - Correct Answer-X1 4/
• What's the Max over speed on a Moving Walk? - Correct Answer-20%

• Where is the Tension Sheave in a Moving Walk? - Correct Answer-Tail end Freight Loading Classes - Correct Answer- ** Transformer Efficiency? - Correct Answer-Power out divided by power in (If a transformer rated at 500 watts is 96% efficient, the primary requires 520 watts at maximum output loading) ** 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- ** Car is running normally but the buzzer will not shut off. Why? - Correct Answer-EHP 3/2 shorted. (Fire Service) ** Relay STR has voltage, TRU has voltage, RU has no voltage. Why? - Correct Answer-TRU 9/8 (Wye, Delta, Transfer) ** Why won't the motor start? - Correct Answer-MOL 1 T/B (Motor Leads) ** What must first be installed on a false car? - Correct Answer-Spring loaded safeties ** A Hydro top call is placed and call returns to the bottom floor without making it up. What's wrong? - Correct Answer-Low oil timer ** How do you measure an escalator handrail? - Correct Answer-Return to return ** You are sent to restart an elevator that's been off for a long time. When the generator starts it trips the overload. Why? - Correct Answer-Dry sleeve bearing