Topics in Basic TechnologyDefinitions of technology and their explanations Examples of technology Forms of technology explained with their differences Types of chain drive Types of belt drive Types of Ceramics Advantages and Disadvantages of Chain Drives Len Academy Questions for Basic Technology JSS3, 2nd Term Len Academy Basic Technology Questions, JSS3 Belt and Pulley Drives: Types of belt in belt drives Refrigerator as an electromechanical device, its parts and operations What is chain drive? Classification of chain drive What are Belt Drives? Advantages and Disadvantages of Belt Drives Type of Lines in Technical Drawings Len Academy questions for Basic Technology, JSS2, 2nd Term Len Academy questions for Basic Technology JSS2, 2nd Term, Part 2 What is Maintenance? Types of Maintenance Hardwood and Softwood - Characteristics and Examples What are Ceramics? Characteristics of Ceramics
Academic Questions in Basic Technology
The _____ functions to remove excess heat from the refrigerator.
D. Expansion Valve
F. Defrost System
A fluid or gas that runs through the compartments of a refrigerator is termed _____.
A. Water vapor
B. Liquid vapor
E. Compressed water
F. Evaporated water
Current flows through a path called _____.
B. Electric Route
E. High Tension
F. Electric Circuit
Googles are safety wears.
Which of the following is false concerning advanced ceramics?
A. They can be made from metallic oxides
B. They are very hard and durable
C. They are corrosion resistant
D. They are fired in the presence of oxygen
E. They are fired at a very high temperature of about 1700oC
F. They can be made from non-oxides such as carbides and borides
A thin continuous line is used for representing the followings except _____.
B. Hatching lines
C. Long breaks
D. Diagonal line used to state plane surfaces
E. Leader lines
F. Back section lines
With regards to chain drives, the diagram above is a/an _____ chain.
A type of chain drive commonly used in bicycles is the _____ chain.
The chain drive is one of the mechanisms through which power is transmitted mechanically from an engine to the wheels via an endless rotating chain.
Using a tractor as an instance, you probably had seen some of its large chain wheels. These massive chains are responsible for transmitting power and kinetic energy (energy in motion) via the rotational movements of the chains. The rate of rotation of these chains results in the speed level of the tractor.
Apart from the tractor, some of the other mechanisms of power transmission that utilizes the chain drive technology include:
Elevators and so on.
A chain drive is defined as a system comprising an endless chain running over two sprockets, bringing about mechanical movements in the process.
Think of the sprockets as toothed wheels over which an endless rotational chain is fitted.
The image below shows the roller chain (which is a type of chain drive):
The chain in the above diagram (often called roller chain or drive chain or transmission chain) is used to convey power over two sprocket wheels with its edged teeth meshing with the holes at the center of the chain.
Chain drives are employed or utilized in diverse areas; some of which include:
Oil well drilling rigs
Building and Construction
Transportation and Agricultural machinery
Based on the utilization or uses of the chain drives, they can be classified into three types. These are:
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Amazing facts in Basic Technology
Rubber bands last longer when refrigerated
Lighter was invented before matches
Johann Wolfgang Dobereiner was credited with the invention of lighter in 1826 while the match was made 3 years later
Volkswagen group of companies own some of the top cars of the world. These are Audi, Bentley, Bugatti, Ducati, Lamborghini and Porsche
Notable points in Basic Technology
Arrowhead lines are lines with pointed edges at one or both ends. The pointed edges are in the form of an arrow.
Arrowhead lines are used:
At the end of dimensional lines.
As measurement lines.
A thin continuous line could be a straight or curved line. However, the main point to remember is this: 'it is a tiny line with no dot or dashes within it'.
A thin continuous line is used for representing the followings:
Short center lines
Diagonal lines used to state plane surfaces
Backside section lines
Any action that involves the servicing, checking, replacing and repairing of an equipment, object or device is termed maintenance.
Maintenance has two main goals. These are:
To prevent a breakdown
To repair the breakdown
Below are the types of maintenance:
Softwoods are often derived from coniferous trees, that is: trees with needle-like leaves, and whose seeds are covered in cones.
Below are some characteristics of softwood:
Most softwood have lower densities than hardwood (weighs lower).
In terms of price, they are often less expensive than hardwood.
Their growth rate is faster than hardwood.
Most softwood do not shed their needle-like leaves during the year. However, the softwood 'larch' and 'cypress' are exceptions.
They are less fire resistant.
The diagram below shows the various types of line in technical drawing, their description and general application: