BRIDGES AND CULVERTS - Set 5

Set 5 Practice Mode

Prev

Q2440

Permalink

What is the minimum percentage of oxygen concentration in underground air quality for tunnel?

A 0.125

B 0.155

C 0.175

D 0.195

Q2441

Permalink

What is the maximum noise levels of ventilation fans while measure at the closest point of employee exposure?

A 90 decibel

B 100 decibel

C 120 decibel

D 130 decibel

‹
1
2
3
4
5