Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
19 Cards in this Set
- Front
- Back
|
What is the smallest wire that is permitted in an elevator installation |
#24 |
|
|
Final terminal stopping limits and pit stop switches are devices that are included in a traction elevator _______ _______? |
Safety circuit |
|
|
What are the two most common functions of load weighing |
To control the generator field and initiate Express operation |
|
|
How should AC incandescent lamp sockets be connected |
Connect the hot lead to the center terminal and the ground conductor to the Shell |
|
|
What device is required with automatically closing, vertical sliding, freight elevator doors |
A warning bell |
|
|
What factor is reduced by the addition of a deflector sheave |
Arc length of contact |
|
|
Once an SCR is gated, how long does it continue to conduct |
Until the AC sine wave passes through zero |
|
|
At what speed should the governor switch contact be set to open |
90 to 95% of Governor tripping speed |
|
|
What document may be the only place to look for information such as the type of fixtures, car panel, fire service floor, etc |
Job abstract |
|
|
Why are new traveling cables allowed to hang free for a Time |
To relieve torsional stretch |
|
|
Minimum amount of spare wires that should be pulled into car or controller |
10% |
|
|
When more than one screw is used as a terminal, how are the screws connected |
With a terminal post |
|
|
What is the purpose of the suicide circuit |
It prevents generator voltage buildup |
|
|
If the DC output of a three-phase rectifier is lower than specified, what would be the most likely cause |
One input phase is missing |
|
|
At what point is the main motor field voltage highest |
When the elevator is leveling |
|
|
If there is voltage at the generator armature but not at the motor armature, what is most likely wrong |
The loop circuit is open |
|
|
If the generator is rotating and you apply voltage to the field but no armature voltage is produced, what is most likely wrong |
The generator field is open |
|
|
What does closed loop DC motor control have that is not found on other DC operators |
Encoder |
|
|
On mechanically linked swing arm door operating mechanisms with two speed doors, how is the slow door driven |
It is driven by a secondary link on the swing arm |
