Electrical Safety Rules Test (Part 3 Of 4)-electrical Person
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Electricity is used all around us in our homes, offices, and streets. As we continue in our revision on electrical safety, I have prepared the third test in a set of 4 designed to help you adequately prepare for the electrical safety exam. Why don’t you give it a try and see just how much you need? All the best!
- 1.One of the below areas is not a hazardous area:
- A.
Areas close to cargo tanks and piping.
- B.
Areas close to cargo tank and piping relief valves and vents.
- C.
Battery and paint locker
- D.
Motor room with supply fans located outside of the dangerous zones.
- 2.Electrical equipment could ignite a flammable atmosphere in several ways.
- A.
Sparks from opening and closing contacts
- B.
High surface temperature
- C.
Loose connections
- D.
All the answers are correct.
- 3.The selection of what equipment can go in a Hazardous area is determined by:
- A.
The Hazardous area plan,
- B.
The equipment protection type
- C.
The ignition temperature of the flammable atmospheres that may occur
- D.
All the answers are correct.
- 4.Ex d is the type of protection designed to:
- A.
Prevent ignition from arising
- B.
Prevent ignition from spreading outside enclosure
- C.
Limit ignition energy
- D.
Prevent the atmosphere entering the enclosure
- 5.Zone 0, is a Hazardous area:
- A.
An area in which an explosive gas/air mixture is likely to occur in normal operation.
- B.
In which an explosive gas/air mixture is continuously present, or present for long periods.
- C.
An area in which an explosive gas/air mixture is not likely to occur in normal operation and, if it occur ,it will exit for only a short time.
- 6.Battery spaces may be defined as:-
- A.
Not hazardous area
- B.
Hazardous area
- C.
Hazardous area depending upon battery type, capacity and charging arrangement.
- 7.What is meant by being intrinsically safe?
- A.
Electric wiring executed by approved manufacture?
- B.
Any electrical product, being water resistant?
- C.
Product having a special wiring system?
- D.
Cannot produce enough energy to ignite a gas (explode)?
- 8.Some equipment may be marked with the following symbol: EX i what does that mean?
- A.
Intrinsically safe.
- B.
Explosion proof.
- C.
Internally explosion proof.
- D.
Not safe in gas dangerous area.
- 9.In installations of INTRINSICALLY SAFE equipment it is required that all equipment should be separated from non-intrinsically safe equipment, and to be of a special colour. What colour is that?
- A.
Red
- B.
Orange
- C.
Blue
- D.
Green/Yellow
- 10.Flanges of some pipe work are bonded because:
- A.
These can become electrostatically charged by movement of the fluids within them
- B.
There can be a potential risk of a spark discharge and ignition of any gas present outside
- C.
Earthling the vessel prevents the build-up of such charges.
- D.
A,B & D
- 11.The equipments that maintain a small internal overpressure (of the order of 0.5 mbar minimum) which prevents the entry of a gas/air explosive mixture or flammable substance are known as:
- A.
Ex-d
- B.
EX-i
- C.
EX-p
- 12.The minimum temperature required to cause self-sustained combustion without a flame in any material is the
- A.
Flash point
- B.
Fire point
- C.
Ignition temperature
- D.
All answers are wrong
- 13.The three elements necessary for a fire or explosion hazard to exist.
- A.
Earth, Wind and Fire
- B.
Fuel, Source of ignition, Oxygen (air)
- C.
Gasoline, Cigarette lighter, Fumes
- D.
Vapors, Source of ignition, nitrogen
- 14.Which of the following does not describe a confined space?
- A.
Limited access
- B.
Limited natural ventilation
- C.
Limited working space
- D.
An area designed for human occupancy
- 15.Which one of the following is the major secondary parameter for equipment in Hazardous atmospheres:
- A.
Gas grouping
- B.
Surface temperature
- C.
Protection against ingress of solid bodies and liquid (IP)
- 16.HIMAP is -------- measuring and portection device.
- 17.Material which permits the flow of ------ are referred to as conductors
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