@air
2025-04-15

10. When selecting equipment, the comprehensive efficiency coefficient is usually taken?

A. 0.5-0.6
B. 0.7-0.85
C. 0.9-1.0
D. 1.1-1.2

Answer: B
parsing: When selecting a model, it needs to be multiplied by an efficiency factor of 0.7-0.85.

Welcome!

Related Articles:
@air
2025-04-15

What are the main characteristics of portable air compressors?

A. Weight B. Light weight C. Large D. Small size and light weight Answer: D. Small size and light weight

@air
2025-04-15

12. Which annex to ISO 1217 does the industry standard for exhaust volume correspond to?

A. Annex A B. Annex C C. Annex D D. Annex E Answer: B Analysis: The exhaust volume standard corresponds to ISO 1217 Annex C.

@air
2025-04-15

In the ISO 8573-1:2010 standard, what is the dew point temperature requirement for compressed air for spraying?

A.≤0℃ B.≤-10℃ C.≤-20℃ D.≤-30℃ Answer: C Analysis: The spraying process requires a compressed air dew point of ≤-20℃ (PDP) to prevent moisture condensation from affecting the coating quality.

@air
2025-04-15

How many years is the equipment life of environmentally friendly oil-free air compressors usually?

A. 5-7 Year B. 7-10 Year C. 10-12 Year D. 12-15 Answer: C analysis: Environmentally friendly oil-free air compressor adopts a fully enclosed design, and the equipment life can reach 10-12 years, far exceeding traditional oily lubrication…

@air
2025-04-15

How many tens of thousands of yuan may the annual loss of a coating production line that does not use environmentally friendly oil-free air compressors?

A. 100 B. 300 C. 500 D. 800 Answer: D Analysis: Coating defects caused by oil pollution can cause annual losses of more than 8 million yuan for a single production line, highlighting the importance of oil-free air compressors.