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Exam of 6 pages for the course Elevator mechanics at Elevator mechanics (LA City)
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LA CityHow many passengers are allowed on an elevator with a 2000 rated load? - answer 13(150lbs per person) 2000/150=13.3
What is the minimum clearance around a hoist machine? - answer 18 inches
When must oil buffers be used? - answer Over 200FPM (0-50 solid/50-200 spring/200-up oil)
Where must the light switch be mounted in the machine room? - answer Within 18 inches of the locked side of the entrance door
What is the allowable maximum force developed by a door closer? - answer 30 foot pounds
What is the maximum tripping speed of an elevator governor with a rated speed of 200FPM? - answer 175FPM & not less than 115% of rated speed
At what opening height & above are pull straps required on vertical opening manual doors? - answer 6 feet 6 inches (6'6")
If the escape hatch of the elevator is 16 inches wide what is the minimum length? - answer 25 inches* escape hatch must be a minimum size of 400 sq inches
What is the color of wire used for grounding under LA city code? - answer Green
What is the weight of the counterweight when the weight of the car is 6000lbs and the rated load is 4000lbs? - answer 7600lbs (determine what 40% of rated load is & add that to the weight of the car.)
4000lbs capacity X 40% = 1600lbs + 6000lbs = 7600lbs
What is the minimum diameter of a compensating sheave? & of a suspension sheave? -
answer Compensating sheave= 32 times diameter of the cable Suspension sheave= 40 times diameter of the cable
What is the maximum speed of an escalator? - answer 125FPM What is the maximum number of degrees along the incline from the horizontal, for an escalator? - answer 30 degrees
Where should metal straps be place on conduit? - answer 3 feet from boxes, fittings or connectors
Where should metal straps be placed on flex? - answer 12 inches from boxes & connectors
What is the maximum size allowable for E.M.T.? - answer 4 inches
What is the breaking strength of 1/2" rope?
5/8" rope? - answer 1/2"= 14500lbs
5/8"= 23500lbs
Which is the most flexible of wire ropes? - answer Tiller rope
What is the most common cause of wire rope failure? - answer Lack of lubrication
Remember - answer 8x19 cable is more flexible but not as strong
6x19 cable is not as flexible but is stronger
What is the most common cause of accidents for mechanics prepared for cartoon inspection? - answer Not observing running clearance
What is the maximum voltage allowed to run to the cab? - answer 300 volts
Does code allow 220VDC AND 110VAC conductors in the same conduit? - answer Yes. As long as the insulation is adequate for the voltage
How do you check for a ground on a wire? - answer 1st turn off the power, then read wire to ground with a bell or meter
How do you reverse a three phase motor? And a DC motor? - answer AC- swap any two leads
DC- swap field or armature leads
Remember - answer Power is equal to I•E *example - 20 amps x 110 volts=2200 watts
Code requires the neutral wire in 110 VAC circuit be what color? - answer White
Why is a guard attached to the front of the elevator? - answer To prevent shear injuries
The minimum height of a counterweight guard from the pit floor is? - answer 7 feet
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