PHYSICS

JAMB 2008 - Question 38

Physics 2008 JAMB Past Questions - Question 38: A short chain is sometimes attached to the back of a petrol tanker to

Choose the correct answers from the options given.
A short chain is sometimes attached to the back of a petrol tanker to
A:
B:
C:
D:
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Correct Answer

D

Explanation

The friction between the tanker and air creates charges which the chain conducts safely to the ground.A short chain is sometimes attached to the back of a petrol (gasoline) tanker to serve various purposes, primarily related to safety and operational needs. Here are a few reasons why a short chain might be attached to the back of a petrol tanker:

1. Grounding: Petrol tankers carry highly flammable liquids, and the risk of static electricity buildup during the transfer of these fluids is a significant safety concern. The short chain can be used for grounding the tanker, helping to dissipate static electricity and reduce the risk of sparks that could lead to fires or explosions.

2. Bonding: In addition to grounding, the chain can be used for bonding the tanker to other equipment involved in the transfer process. Bonding helps to ensure that there is no potential difference in electrical charge between the tanker and the equipment, further reducing the risk of static discharge.

3. Emergency Shutdown: The chain can also serve as an emergency shutdown device. In the event of an emergency or accident, the chain can be pulled to trigger an emergency shutdown system, which can stop the flow of petrol and prevent spillage or further dangers.

4. Maintenance and Safety: The chain can be used by maintenance personnel to access and perform tasks on the back of the tanker. It can also help with securing equipment and tools during maintenance operations.

5. Hose Management: The chain may be used to manage hoses and nozzles during the refueling process, preventing them from dragging on the ground or causing hazards.

It's important to note that safety regulations and practices can vary by region and company, so the specific use and requirements of the chain may differ depending on local laws and safety standards. The primary goal is to reduce the risk of accidents and protect against potential hazards when transporting and transferring flammable liquids like petrol.