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87 Cards in this Set
- Front
- Back
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Calculating Area |
A=π r2 |
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Calculating Volume |
V=AH (area x height) |
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What minimum precautions must be taken before attempting to reset a plunger gripper? |
Assure the system can maintain static no-load pressure |
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Because of the danger of failure in the early single bottom hydraulic jacks, what is now required? |
Adding a safety bulkhead at the bottom of the cylinder |
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How often must a static load test be performed? |
Every year |
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What is another term for up slow down? |
Up transition |
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What describes the operation of a typical hydraulic block valve with an elevator landed at the floor? |
The down valve is closed, the check valve is closed, and the up valve is open |
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How are larger motors usually started? |
Reduced current starting |
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What is another term for schedule 80 pipe? |
Extra strong wall pipe |
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What is the maximum speed of a residential elevator? |
40 ft/min |
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What is required of the installer when the hoistway openings of an installation and not secured from the general public? |
Completely closed off hoistway openings. |
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Rack and pinion pit structures consist of which components? |
Foundation, base enclosure, buffer springs |
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Where are safety hooks mounted? |
They are mounted to the frame below the lowest pinion |
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A minimum of two back up rollers on the machinery plate is required on which kind of hoist? |
Rack and pinion hoists |
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Back up rollers are to be made of which material? |
Metal |
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Which component maintains proper rack-to-pinion engagement? |
Back up rollers |
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A rack and pinion motor brake is spring set and _______ released |
Electrically released |
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Which code do most issues regarding the installation of temporary hoists fall under? |
ANSI A10.4 |
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What is a requirement for the cage of a temporary R&P hoist? |
It uses electrical switches to determine gates are closed. |
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What is the purpose of the centrifigal brake? |
To prevent overspeeding of the car during manual release of the motor brake. |
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What would cause failure of the friction discs to work properly in a safety device? |
Over lubrication of the grease fitting |
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Which safety device is required on a swivel seat? |
Cut-off switch if seat is not locked |
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What is the maximum capacity of an inclined platform lift? |
750 lbs |
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Obstruction sensors on an inclined platform lift are located in which area? |
Under the platform and on edges facing direction of travel |
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What is used to maintain proper tension on a step chain? |
Lower carriage |
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What applies to the proper use of anti slide devices? |
Must be no more than 3/4 inch high |
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What is the maximum allowable distance between skirt panels and the adjacent step tread? |
3/16" |
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Which switch requires manual reset after actuation? |
Step level switch |
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How are larger motors usually started? |
Reduced current starting |
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What authority says that the machine must be visible from the main line disconnect switch? |
National electrical code |
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How would you describe a one-man pressure relief valve test? |
A single mechanic operates the pump from outside the machine room and record relief pressure |
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What are the most common voltage and current requirements for vertical platform lifts? |
120 V, 20 amp |
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How many inches thick and what PSI rating should the concrete base be constructed for on a vertical platform lift? |
4 in thick and 3500 PSI |
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Landing entrance doors to a vertical platform lift cannot be opened unless.....? |
Within 2" of the landing |
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What is the maximum rated speed for a platform lift? |
30 fpm |
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What is the minimum rated load of a vertical platform lift? |
450 lbs |
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What is the maximum rated load for a platform lift? |
750 lbs |
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Which drive system is capable of greater speeds than the powered ball screw? |
Hydraulic drive system |
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How do you determine the "hand" of a platform lift? |
Face the unit at the bottom landing. If the mast or machine tower is on the left than the unit is a "left-hand unit" |
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The running clearance around the sides of the platform floor is to be between?? |
3/8" and 3/4" |
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The top final limit switch is set to stop the platform after it travels past the normal stopping device and before?? |
Before striking an obstruction |
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Final terminal stopping devices are not required for direct plunger or??? |
Or roped hydraulic driving machines |
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(true or false). LULA and residential lifts having the same equipment, use identical sections of governing codes |
False |
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What is the recommended interval for routine periodic inspections for LULA and residential installations? |
Six months LULA, 1-year residential |
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What annual test is required for hydraulic driven LULA and residential lift equipment if the cylinder is not exposed? |
15 minute leak test with no load |
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What annual test is required for governor operated safeties on LULA and residential lift equipment? |
Tripping the governor at the slowest speed possible with no load |
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At five-year intervals, governor's should be tested and tagged for tripping speed, pull through force and ?? |
And safety switch operation |
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Which two functions are combined into a single valve? |
Upstart bypass and relief valve |
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In order to take advantage of wye Delta starting for a pump unit what is required? |
Two line starters |
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What is a special requirement for hydraulic elevator systems that use a flexible line installed in high-pressure portions of the system? |
Replacement at six-year intervals |
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How much clearance must be maintained between the skirt panels and the pallet edge on a walkway with a skirted balustrade? |
1/4 in. |
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How much side-to-side movement is allowed on a belted moving walkway |
3/8 in. |
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What is the maximum allowable gap between interior panels |
3/16 in. |
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How are safeties applied on a rack and pinion driven inclined stairway platform lift |
Safety governor is used |
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On a vertical platform lift, the stop button must be located at what height above the platform floor? |
Between 15 and 48 in. |
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When there is leakage that cannot be accounted for on a hydraulic elevator, what kind of test is performed? |
A pressure test of the unexposed hydraulic line and cylinder |
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How many cm are in one inch? Mm? |
2.54 cm 25.4 mm |
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One mm equals how many inches? |
.03937" |
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Using current from a rectifier, through an anode, then to the cylinder describes what type of corrosion protection system? |
Impressed current system |
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During hydraulic pump motor starting, what is true? |
Line current is high |
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What does the upper truss section of an escalator generally contain? |
The drive machine and upper drive sprocket or bull gear. It also contains the main line disconnect switch, the controller and all other necessary junction boxes |
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An escalator brake must be capable of stopping a down running escalator at a rate no greater than? |
3 ft/sec2 |
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Which escalator brake system would use hydraulics to retract the pads? |
Caliper brake |
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The lower carriage and sprocket is sometimes referred to as?? |
Tension carriage or reversing station |
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When the steps are on the transition boards, it keeps the rollers off The track by?? |
.010 - .015 in. |
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Which track is the bottommost track of the four tracks? |
Lower chain track. |
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What is the purpose of the lower carriage? |
It provides the proper amount of tension for the step chain axles to travel properly through the escalator truss. |
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On a 4-track system, the uppermost track carries the? |
Step chain axle rollers |
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The transition board is used to minimize the load on? |
The step wheels during the turnaround |
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Minimum depth requirement for a step cannot be less than? |
15 3/4 in. |
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The rise between treads should not exceed?? |
8 1/2 in. |
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What is the maximum depth and width of slots on cleated step treads? |
No more than 1/4 inch wide and no less than 3/8 inch deep |
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Step width is restricted to? |
22 and 40 inches |
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How many tracks are found on moving walks? |
2 |
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What is the minimum step width of a moving walkway? |
22" |
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At what distance must have required permanent mechanical holding device stop and hold a LULA elevator above the pit floor? |
35 to 79 in. |
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In a situation where a standard pit is provided for a LULA elevator and when no hoistway enclosure is provided at the lower level, how high of an enclosure must be around the pit? |
84" |
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What is the maximum speed at which a governor (if provided) on a LULA or residential installation is permitted to trip? |
75 ft per minute |
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Overspeed valves will stop a downward traveling LULA elevator if it exceeds rated speed by what amount? |
110 to 140% |
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What type of LULA elevator is not required to be in an enclosed hoistway, provided that there is a means to stop down running car if an obstruction exists below the car? |
Private residence elevator |
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When using wire rope, the diameter of the sheave must be how many times the diameter of the suspension ropes? |
30 |
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In a private residence elevator, what is the term for the 2 x 10 plank that is doubled up to serve as the anchor for the rail brackets? |
Pillar |
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The hoistway doors for a LULA elevator have which of the following distinct variations to passenger elevator code? |
A powered swing-door is permitted |
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What is the maximum allowable rated load for a LULA elevator |
1400 lbs. |
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What is the maximum speed of a residential elevator? |
40 ft/min |
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For belted walkways, tension is normally maintained at approximately??? |
3000 lbs |
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The drive end of a belted walkway is called? |
The Head end |
