Consider the following methods of preservation of timber
1. Dipping
2. Brushing or spraying
3. Pressure impregnation
The correct sequence in decreasing order of the effectiveness of these methods of preservation is
a)
1, 2, 3
b)
2, 1, 3
c)
3, 1, 2
d)
3, 2, 1
Correct answer is option 'C'. Can you explain this answer?

Question

Consider the following methods of preservation of timber
1. Dipping
2. Brushing or spraying
3. Pressure impregnation

The correct sequence in decreasing order of the effectiveness of these methods of preservation is

a)
1, 2, 3
b)
2, 1, 3
c)
3, 1, 2
d)
3, 2, 1

Correct answer is option 'C'. Can you explain this answer?

Answer

Preservation of Timber:

Timber is a natural material that is prone to decay and insect attack. Therefore, preservation of timber is necessary to increase its durability and service life. There are several methods of preserving timber, including:

1. Dipping
2. Brushing or spraying
3. Pressure impregnation

Effectiveness of Preservation Methods:

The effectiveness of timber preservation methods varies depending on several factors, such as the type of timber, the intended use, and the environmental conditions. However, in general, the effectiveness of the three methods of preservation listed above can be ranked as follows:

1. Pressure impregnation: This method involves forcing preservative chemicals into the timber under high pressure. This ensures that the entire piece of timber is treated and that the preservative chemicals penetrate deeply into the wood. Pressure impregnation is the most effective method of preserving timber and is widely used in the construction industry.

2. Dipping: This method involves immersing the timber in a preservative solution for a prolonged period. Dipping is effective for small pieces of timber and for treating timber that cannot be pressure impregnated. However, it is not as effective as pressure impregnation, as the preservative chemicals may not penetrate deeply into the wood.

3. Brushing or spraying: This method involves applying a preservative solution to the surface of the timber using a brush or a spray. Brushing or spraying is the least effective method of preserving timber, as it only treats the surface layer of the wood. However, it may be useful for treating small areas of damaged timber or for preventing surface decay.

Conclusion:

In conclusion, the correct sequence in decreasing order of the effectiveness of these methods of preservation of timber is 3, 1, 2. Pressure impregnation is the most effective method of preserving timber, followed by dipping and then brushing or spraying.

Answer

C

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