Unit 4

Question 1

What term best describes connecting all metal parts with an electrical conductor to the same ground potential to minimize shock hazards?

Answer 1

Bonding

Question 2

When are pressures switches required on hydraulic elevators, as per the ASME A17.1/CSA B44 code?

Answer 2

When top of cylinder is above storage tank

Question 3

What is the minimum distance that must be maintained between pieces of machine room equipment allowing for adequate maintenance access, as per the ASME A17.1/CSA B44 code?

Answer 3

450mm (18in)

Question 4

Why are rubber pads placed under the machine, controller, drives? And hydraulic tanks?

Answer 4

To reduce noise and vibrations

Question 5

What must be considered when installing double-wrapped gearless machine?

Answer 5

Sheave offset/pull off

Question 6

What is the main purpose of machine beams for a geared machine?

Answer 6

Support machine & it’s suspended load

Question 7

Which of the following sizes of wire would be the smallest according to a he AWG (American Wire Gauge) standard? (20,14,8,0)

Answer 7

20

Question 8

What wiring procedure can be used to prevent oil from creeping along the motor leads and into the controller from the tank, on a hydraulic elevator installation?

Answer 8

Butt slicing

Question 9

What main forces must a basement traction machine be designed to resist?

Answer 9

Up-thrust forces that are applied

Question 10

What are 1:1 roped machines set and aligned in relation to?

Answer 10

Centre line of car & counterweight guide rails