問題一覧
1
The governor rope tension sheave:
Is located in the machine room
2
According to the accessibility standard A117.1 a door must reverse and reopen if:
a person or object comes within its path
3
A Direct plunger hydraulic elevator has the plunger connected:
to the car
4
The modern hydraulic elevator receives hydraulic pressure from:
an electric motor driven pump
5
The purpose of the traveling cables is to:
provide power and signal to the elevator car
6
If the closing speed of a horizontally sliding door system is increased:
the kinetic energy will increase
7
If a traction elevator has a sheave on top of the car and counterweight, it is said to be roped:
2:1
8
A roped hydraulic elevator has a maximum ratio of:
1:2
9
The door operator for hydraulic passenger elevators is located:
on the car top
10
The maximum allowable clearance between swinging hoistway doors and car gates is:
4 inches
11
Freight elevators usually have:
vertically sliding hoistway entrance doors and vertically sliding car gates.
12
Standing inside, the elevator at the door jam is on the right it is considered:
right hand application
13
Oil buffers are required below:
Both car and counterweight for rated speed over 200 ft./min.
14
The brake on the driving machine:
is released, electric power is removed and applied by spring force.
15
The selector serves to:
Provide signal to the controller on car position
16
‘A’ type safety:
none of the above
17
The rated speed of modern hydraulic elevator is:
usually less than 200 ft/min.
18
A roped-hydraulic elevator is:
Required to have a car safety
19
The purpose of the governor is to:
cause the power to be removed and the safety to set when overspeed occurs.
20
The purpose of the motor generator is to:
provide DC power from AC power
21
The driving machine of a hydraulic elevator is considered to be:
both a and b.
22
The purpose of the compensating ropes is to:
Compensate for the change in balance due to the weight of the suspension robes .
23
The final switch:
only operates if other controls fail
24
Retiring cams are usually:
must lift before the elevator can move away from the landing
25
A retractable safety edge (shoe) on a horizontal sliding door:
requires contact to cause the door to stop and reopen