Elevator Mechanic Study Test 2024.
A Latching relay: Used for call registration,direction selection or as selector relays
Two types are: Set/Rest are electrical and Mechanical Latching relays
Need to know latching relay symbol, Its a box with shaded triangle in lower right hand corner. - ANSWER...
bad ground you are using a temp run box and you ge
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Elevator Mechanic Study Test 2024.
A Latching relay: Used for call registration,direction selection or as selector relays
Two types are: Set/Rest are electrical and Mechanical Latching relays Need to know latching relay symbol, Its a box with shaded triangle in lower right hand corner. - ANSWER Which relay do you need to Order
710 Pg, 7
RPM = 60 ∙ ƒ ÷ P÷2 =
Step 1. 60 x Frequency (Hz.) = Step 2. Poles ÷ 2 =
Take answer 1 and ÷ by answer 2 = - ANSWER Know the formula for RPM
435 Pg. 5
If you are referring to a megohm meter, it is a test of the insulation properties of such things as electric wiring, motor windings and high power antenna mounts. We use a "megger" or "meg out" electrical wiring and equipment to see if it is shorted to ground or the frame in any way. The megger uses much higher voltages to check resistance than a normal Volt-ohm meter. Minimum resistance is 1 Meg Ohm - ANSWER Know what a Megger is and what it does
636 Pg. 13
(1) A parallel connection. (2) A resistive element placed across the terminals of an armature to bypass a portion of the current. (3) A flexible electrical conductor designed to conduct current around the mechanical joint between two conductors. (4) The resistive element (Usually of very low resistance) used in parallel with a DC ammeter movement to bypass a calibrated portion of the total circuit current. - ANSWER Shunt Overloads
425 All Pages
Bad Ground - ANSWER You are using a Temp Run Box and you get shocked! Why!
520 Pg. 4
The bridle hitch can consist of two,three, or four single hitches (fig. 3-22), used together to form a bridle hitch for hoisting an object A sling with two legs used to lift a 1,000 pound object will have 500 pounds of the load on each leg when the sling angle is 90 degrees. The load stress on each leg increases as the angle decreases; and if the sling angle was 30 degrees lifting the same 1,000 pound object, the load will be 1,000 pounds on each leg. Try to keep all sling angles greater than 45 degrees; sling angles approaching 30 degrees are considered extremely hazardous and must be avoided at all cost. - ANSWER Bridal Hitch
128 Pg 17
Scaffolding should be tied to the structure using
#9 wire or tie-in devices. The first vertical tie
should be at the maximum height of 4 times the
narrowest base dimension. Additional ties are not
to exceed 26' vertically. Maximum horizontal
distance between ties is not to exceed 30'. - ANSWER Scaffolding, You have 32' of rise,
you are using 3x5 scaffolding. Where will the tie off points be ?
140 PG. 287-288
Counterweights (Typically) are hung to counter balance the weight of the car PLUS 40%
of Capacity Load. - ANSWER How much should Counterweight way?
240 Pg. 14
Note: We do not use wire smaller than #20 in travelling cables and #24 outside travelers.
Largest wires are feeders to Hoist /Pump motor
We always have 10 % spares
10% of 52 = 5.2
On a calculator Multiply the percent 10 by the number you have and ÷ by 100
10 X 52 ÷ 100 = 5.2 - ANSWER Pulling Spare Wires (Example) 10% of 52 Wires
515 Pg.26
The correct lube must be used on chains. - ANSWER The freight door motor is spinning
but the door wont move, Why?
535 Pg. 9
Lula: Limited use/Limited Access (Example Wheelchair Lifts)
Max Rise 25'
Max Speed 30 Ft/Min
Max Capacity 1400 Lbs.
Max Platform Area 18 Sq/Ft.
Residential Elevator:
Max Rise 50 ' Max Speed 40 Ft/min
Max Capacity 940 Lbs.
Max Platform Area 19 Sq/Ft 840 Pg 2
Dumbwaiters:
Platform limited to 9 Sq/Ft
Inside height is limited to no more than 4 Feet
Capacity is limited to 500Lbs
No Riders - ANSWER Read Lula and Dumb waiters
545 Pg 1
You never get on top and you work only partially in with the main line OFF - ANSWER If
you get on top of Dumbwaiter what must be done?
545 Pg 14
Notes:(Pi) π is 3.1416 and 231 Cubic inches to the Gallon
Area:
Remember to ÷ 6" ÷ 2 = 3 to get Radius
Area = π∙ r²
Area = 3.1416 x 3 x 3 = 28.27 inches or 3.146 x 9 = 28.27
Volume
Multiple are times height to solve for Volume
V = A∙H
V = 28.27 x 300 (25" feet x 12" = 300)
V = 8481 Cubic Inches
Since we already know there are 231 cubic inches to the gallon 8481 ÷ 231 = 36.71 Gallons - ANSWER PSI Formula and Gallons (Example) How much
oil to move a 6" jack 25'
815 Pg 10
Relief Valve :
Must be tested Annually
Its is simply Pressure relief (If car strikes obstruction,Overloaded Car,Car hits stop ring)
If set to light Car may not move!
Check Valve: It is simply a one way valve permitting oil to flow in one direction
Up Valve:
The most complicated valve in system
Controls Up Start and acceleration to high speed, up slow down, up leveling speed, and
up stopping.
Down Valve:
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