550 Machine room maintenance
The setting of a car governor electrical contact on cars 500 foot a minute or less must be below what percentage less then the car governor tripping speed
10%
The mechanical tripping speed of the governor cannot be lower than what percentage of the car speed
115%
What is the maximum soldering iron wattage for use on printed circuit boards
40w
What circuit operates after the break fully energizes to reduce break coil current
Brake cooling
What could be the cause of an intermittent loop overload trip
Brake not lifting, properly the car is overloaded,excessive motor bearing friction
What really uses oil or silicon fluid To control the time in which the core and piston rise
Dashpot overload
What should be observed before performing maintenance on a really logic controller
Have replacement parts available, protect the area below your work area, lock and tag out the mainline
What must be done before disassembling a machine brake
Land the counterweight
What area of operation is most affected if all brushes in a machine or changed at one time
Leveling
Sealed bearings should be lubricated at what frequency
Never
What is the result of too large of a relay Armature airgap
Positive pick up may be lost
What is the purpose of a relay Armature residual guard
Prevents relay from failing to drop due to residual magnetism
Which of the following is the most important part of any job in an elevator industry
Safety procedures
How is a magnetic blowout coil wired in relation to the circuit it's contact controls
Series
What function does a starter panel perform
Starting the MG set
What type of fuse is used in a circuit where short duration, high currents occur in normal operation
Time-delay
What is the process called that is applying a small amount of solder on the soldering tip to allow maximum heat transfer
Tinning
Why is it necessary to isolate a component before taking an ohmmeter measurement
To eliminate parallel resistance
What is the purpose of options-isolators On solid state controllers
To interface high and low voltage
What type of rectifiers lose ability to deliver rated Current as they age
selenium
