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Safety Interview Questions 26 contains questions about safety measures at roof work,  hazards on construction site,  power tools,  occupational diseases in construction industry,  PEL for 8 hrs of noise.

251. List any 2 safety measures at roof work?

252. What is the unit of light?

253. Write any three environmental hazards on construction site?

254. What is the Min & Max percentage of O2 allowed to work in confined space?

255. Write any three heat-stress related disorders?

256. Ratio of positioning ladders?

257.  What is the voltage to be used for power tools?

258. List three occupational diseases in construction industry?

259. What is the Maximum PEL for 8 hrs of noise?

260. Total capacity of bund wall should be?

251. List any 2 safety measures at roof work?

I. Isolate overhead electric lines.

II. Use of safety nets and fall arrest systems.

252. What is the unit of light?

There are many different units for measuring light and it can get very complicated. Here are a few common measurement terms:

I. Candela(cd)

Unit of luminous intensity of a light source in a specific direction. Also called candle.

Technically, the radiation intensity in a perpendicular direction of a surface of 1/600000 square meter of a black body at the temperature of solidification platinum under a pressure of 101,325 newton’s per square meter.

II. Foot-candle(fcorftc)

Unit of light intensity, measured in lumens per square foot. The brightness of one candle at a distance of one foot. Approximately 10.7639 lux.

III. Lumen(lm)

Unit of light flow or luminous flux. The output of artificial lights can be measured in lumens.

IV. Lux(lx)

 Unit of illumination equal to one lumen per square meter. The metric equivalent of foot-candles (one lux equals 0.0929 foot-candles). Also called meter-candle.

253. Write any three environmental hazards on construction site?

I. Air pollution

II. Water pollution

III. Noise Pollution

IV. Asbestos dust becoming airborne

254. Write any 4 hazards in hot work activity?

I. Fire

II. Explosion

III. Electrocution

IV. Burns

V. Arc-flash

VI. Oxygen-depletion

VII. Toxic fumes

254. What is the Min & Max percentage of O2 allowed to work in confined space?

As per OSHA 19.5 % - 23.5%.

255. Write any three heat-stress related disorders?

I. Heat stroke - 

Defined by a body temperature of greater than 40 °C (104 °F) due to environmental heat exposure with lack of thermoregulation. Symptoms include dry skin, rapid, strong pulse and dizziness.

II. Heat exhaustion - 

Can be a precursor of heatstroke; the symptoms include heavy sweating, rapid breathing and a fast, weak pulse.

III. Heat syncope - 

Fainting as a result of overheating.

IV. Heat edema

V. Heat cramps - 

Muscle pains that happen during heavy exercise in hot weather.

VI. Heat rash - 

Skin irritation from excessive sweating.

 VII. Heat tetany - 

Usually results from short periods of stress in intense heat. Symptoms may include hyperventilation, respiratory problems, numbness or tingling, or muscle spasms.

256. Ratio of positioning ladders?

 1:4

257.  What is the voltage to be used for power tools?

110 or 220 Volts


258. List three occupational diseases in construction industry?

I. Asbestos-related injuries such as mesothelioma and other cancers.

II. With noise damage to the ear, it may take many years for the symptoms to appear.

III. Hand-Arm Vibration Syndrome (HAVS) can cause permanent damage.

IV. Respiratory Ailments (silica).

V. Repetitive work is one of the major causes of Musculoskeletal Disorders (MSDs).

VI. Dermatitis- Reaction of the skin to any irritant varies from one individual to another.


259. What is the Maximum PEL for 8 hrs of noise?

 As per OSHA 90 dBA.


260. Total capacity of bund wall should be?

I. The gross capacity of the bunded area should be 110% of the capacity of the biggest tank or 25% of the total capacity of all tanks within the bund whichever is greater. 

Wall type bunds at tank storage facility should be from 0.5 m to 1.5 m high. The distance between tank and bund walls must be at least 1 m. If the bund wall s are more than 1 m above floor provide steps or ladder for quick escape.

II. Drums Storage: The gross capacity of a bunded area should be sufficient to hold at least the volume of 25% of the drums to be stored up to 10 Kl plus 10% of any volume in excess thereof.

III. Tank Vehicle Loading: The capacity of a bunded area should at least equal to 100% of the largest compartment of any tank vehicle using the filling facility and the maximum quantity capable of being discharged from the filling point with full flow during a period of 2 minutes.

Thanks for reading - Safety Interview Questions 26
Naitik Patel
Industrial Guide

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