Back to Course

JSS3: BASIC TECHNOLOGY - 1ST TERM

0% Complete
0/0 Steps
  1. Materials & Processing - Timber I | Week 1
    6 Topics
    |
    1 Quiz
  2. Materials & Processing - Timber II | Week 2
    4 Topics
    |
    1 Quiz
  3. Processing of Materials - Metals | Week 3
    5 Topics
    |
    1 Quiz
  4. Processing of Clay, Ceramics and Glass | Week 4
    5 Topics
    |
    1 Quiz
  5. Methods of Producing Plastics & Rubber | Week 5
    2 Topics
    |
    1 Quiz
  6. Drawing Practice - Isometric Drawing | Week 6
    4 Topics
    |
    1 Quiz
  7. Oblique Projection | Week 7
    2 Topics
    |
    1 Quiz
  8. Orthographic Projection | Week 8
    4 Topics
    |
    1 Quiz
  9. Perspective Drawing (One - Point Perspective Drawing) | Week 9
    4 Topics
    |
    1 Quiz

Quizzes




  • Kofa Study
Lesson Progress
0% Complete

Content:

  • Theory Questions & Answers
    • We have provided answers to the questions, try to attempt the questions yourself without checking the answers.
    • Click on the “View Answers” button to view the answers.

Evaluation Questions:

1. (a) What is wood seasoning?

(b) Name two methods of wood seasoning.

(c) Name three (3) reasons for seasoning wood.

(d) If a sample of wood weighs 136 gm before and 100 gm after drying, what is the percentage moisture content?

2. (a) What are timber defects?

 

You are viewing an excerpt of this Topic. Subscribe Now to get Full Access to ALL this Subject's Topics and Quizzes for this Term!

Click on the button "Subscribe Now" below for Full Access!

Subscribe Now

Note: If you have Already Subscribed and you are seeing this message, it means you are logged out. Please Log In using the Login Button Below to Carry on Studying!

Responses

Your email address will not be published. Required fields are marked *

Theory Questions – Timber II

  1. (a) What is wood seasoning?

Answer: The process of reducing the moisture or water content of wood is called wood seasoning.  

 

(b) Name two methods of wood seasoning.

Answer:

  • Natural or Air Seasoning

  • Artificial or Kiln Drying

 

 (c) Name three (3) reasons for seasoning wood.

Answer:

1. Seasoning makes the wood stronger.

2. It makes the wood lighter in weight.

3. It makes wood take in (absorb) preservatives easily.

 

 (d) If a sample of wood weighs 136 gm before and 100 gm after drying, what is the percentage moisture content?

Solution:

⇒ \( \frac{wet \: weight \: – \: dry \: weight}{wet \: weight} \: \times \: \frac{100}{1} \)

⇒ \( \frac{136gm \:  – \:  100gm}{136gm} \: \times \: \frac{100}{1} \)

= \( \frac{36}{136} \: \times \: \frac{100}{1} \)

= \( \scriptsize 0.264 \: \times \: 100\) = \( \scriptsize 26.4 \% \)  

 

2. (a) What are timber defects?

Answer: Timber defects are faults or irregularities in wood, caused either naturally or during the processing of the wood, which reduces the value or quality of the timber.

 

(b) Name two categories of timber defects.

Answer: Defects in timber can be Natural or Artificial.

 

(c) Give two examples of defects that fall under each category.

Answer: Natural – Knots, Shakes Artificial – Bow, Cup  

 

3. (a) What is timber preservation?

Answer: Wood preservation is the process of applying chemicals to wood, so as to make it poisonous to insects, worms, and fungi, and to prolong its lifespan. The solutions used for this purpose are referred to as preservatives.  

 

(b) State five (5) properties of good timber preservatives.

Answer:

i) They must be toxic to fungi, pests and marine organisms.

ii) They should not have corrosive properties.

iii) It should not contain any harmful substances, gases etc.

iv) It should not have an unpleasant smell.

v) It should not affect timber strength.

 

(c) List three methods of applying preservatives.

Answer:

  • Cold Immersion
  • Spraying
  • Brushing

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .
error: Alert: Content selection is disabled!!