Elevator Mechanic Exam (2023 – 2024) With Complete Solution
A Latching relay: Used for call registration, direction selection or as selector
... [Show More] relays
Two types are: Set/Rest are electrical and Mechanical Latching relays
Need to know latching relay symbol, It’s a box with shaded triangle in lower righthand corner. - Which relay do you need to Order
RPM = 60 ∙ ƒ ÷ P÷2 =
Step 1. 60 x Frequency (Hz.) =
Step 2. Poles ÷ 2 =
Take answer 1 and ÷ by answer 2 = - Know the formula for RPM
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 - Know what a Megger is and what it does
(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. - Shunt Overloads
Bad Ground - You are using a Temp Run Box and you get shocked! Why!
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 1000 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 1000 pound object, the load will be 1000 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. - Bridal Hitch
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'. - Scaffolding, You have 32' of rise, you are using 3x5 scaffolding. Where will the tie off points be?
287-288
Counterweights (Typically) are hung to counter balance the weight of the car PLUS 40% of Capacity Load. How much should Counterweight way?
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 - Pulling Spare Wires (Example) 10% of 52 Wires
The correct lube must be used on chains. - The freight door motor is spinning but the door wont move, Why?
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. [Show Less]