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Draughtsman (Civil)
BRIDGES AND CULVERTS
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1) What is the minimum percentage of oxygen concentration in underground air quality for tunnel?
0.125
0.155
0.175
0.195
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Correct Answer: 0.195
Question Details
1) What is the minimum percentage of oxygen concentration in underground air quality for tunnel?
0.125
0.155
0.175
0.195
2) What is the maximum noise levels of ventilation fans while measure at the closest point of employee exposure?
90 decibel
100 decibel
120 decibel
130 decibel
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Correct Answer: 90 decibel
Question Details
2) What is the maximum noise levels of ventilation fans while measure at the closest point of employee exposure?
90 decibel
100 decibel
120 decibel
130 decibel
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