Vehicle Inspection第 16 / 120 题
You start the engine with the air tanks nearly empty and watch the gauge. On a dual air system, roughly how quickly should pressure build from 85 to 100 psi at operating rpm?
a.Within 5 seconds
b.Within 15 seconds
c.Within 3 minutes
d.Within about 45 seconds
解析
A properly working dual air system should build from 85 to 100 psi in about 45 seconds at operating rpm. Five or fifteen seconds is unrealistically fast for a truck compressor, and three minutes indicates a weak compressor or a leak that must be repaired.
免费刷完整 120 道题库 — 无需注册。
同考点相关题目
- Why is a leaking exhaust system a serious defect that must be corrected before driving?
- During the applied-pressure portion of your air-brake test, what does the low-pressure warning coming on at 55 psi tell you?
- During the static leak test you find air pressure dropping steadily and you can hear a hiss near the trailer air lines. What should you do?
- At what pressure should the air compressor governor normally cut out and stop pumping air?
- You are performing the tug test after coupling. What are you actually checking?
- Which wheel and rim condition requires the vehicle to be taken out of service?