Topics in Basic TechnologyTypes 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, 2020 Len Academy Question for Basic Technology, JSS3, 2nd Term, 2020, Part 2 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
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.
A chain drive consists of an endless chain running over two _____.
Which is the most economical of all power transmitting drive mechanisms?
A. Pulley drive
B. Gear drive
C. Chain drive
D. Belt drive
E. Thread drive
F. Fabricated drive
Which of the following is false concerning drive mechanisms in machines?
A. Pulley drives do not require a means of power transmission
B. Gear drive is a means of power transmission
C. Chain drive is a means of power transmission
D. Belt drive is a means of power transmission
E. The drive mechanisms of machines accomplishes it's function via a rotational motion
F. Drive mechanisms results into a mechanical movements of machines via power transmission
The lines above are used at the end of dimension lines?
Which of the following is not a type of maintenance?
A chain drive is defined as a system comprising an endless chain running over two sprockets, bringing about mechanical movements in the process.
Below are explanations of the various types of chain drive:
The roller chains are very common since they are used in bicycles, motorcycles and vehicle engines.
They are made up of a series of small cylindrical rollers attached together at both sides of its entire length.
The roller chain requires the sprockets in order to transmit mechanical power. Meanwhile, recall that the sprockets refer to toothed wheels over which an endless rotational chain is fitted. Please see the image of the roller chain in the above diagram.
Roller chains can be single-stranded or multiple-stranded.
Also called the inverted tooth chains, the silent chains are series of toothed link plates that are attached to one another in a pin-like manner. This manner of attachment allows for free flexing of the chains.
Silent chains operate with reduced noise levels and can move more loads at higher speed than a roller chain of the same width.
Functionally, silent chains are preferably used in industrial equipment where quietness, silence and smoothness are required.
Meanwhile, always understand that it is quite difficult to connect together the silent chains from different manufacturers.
They are preferable used for lifting processes rather than power transmission. They don’t need meshing with sprocket sockets because they are made to run over sheaves.
Leaf chains are commonly utilized in trucks that lift large and heavy loads.
The flat-top chains are manufactured for the purpose of conveying materials. For this reason, they are widely used in conveyors.
They consist of plates made up of steel with hinge-like barrels curled on each side with pins inserted into the barrels to create joints acting as both beams and bearings.
The connecting pins in a flat-top chain are usually enlarged or knurled at one end, giving rise to its continuous length.
Detachable chains are made up of similar links that can be easily detached from one another. Each of the link comprise of a hook-shaped end in which adjacent articulation occur.
Detachable Chains will usually transmit power at lower speed.
Detachable chains can be easily assembled and disassembled by pulling up the slack and flexing the links, then sliding a link sideways.
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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
The diagram below shows the various types of line in technical drawing, their description and general application:
Preventive maintenance is carried out routinely on a device even though no apparent fault may be present on such device.
The goal of preventive maintenance as the name suggest is to prevent a sudden breakdown on a device or equipment.
As an instance, a person who services his or her car monthly even though the car is still able to function correctly is said to be carrying out preventive maintenance on the car.
In the course of a preventive maintenance, worn out parts may be discovered and replaced as soon as possible. Also, there may be a change of oil while other little adjustments may also be carried out.
We can even carry out preventive maintenance on our body to prevent certain diseases. For this reason, some persons have discovered cancerous cells in their body through regular medical checkup; and were able to kill such cells before they become malignant.
As a matter of fact; immunization is a form of preventive maintenance.
Hardwoods are derived from angiosperms. They show the following characteristics:
They usually have a higher density than softwood. Balsa is an exception.
They are usually more expensive than softwood.
They grow at a slower rate than softwood.
Hardwood trees shed their leaves in certain times of the year.
Hardwood are more fire resistant than softwood.
The leaves of hardwood trees are evergreen.
They are used for making quality furniture (in terms of strength). They are also suitable for decking in buildings.
Hardwood trees always have divided trunks which are sometimes referred to as a dendritic form.
In terms of price, hardwood are usually more expensive than softwood.
Examples of hardwood include iroko, ash, beech, alder, teak, birch, mahogany, maple, oak, balsa and walnut.
Ceramics are refractory. They also require a very high amount of heat and subsquent cooling to be formed.
Being refractory means that they are capable of withstanding a variety of abuses like high temperatures and chemical attacks.
Ceramics are generally made by taking clay from the ground and mixing it with water. It is then shaped into any form and fired inside an oven (called kiln) at a very high temperature. They may then be decorated with a waterproof, paint-like substances called glazes.
Ceramics may have constrasting physical and chemical properties (or characteristics); but in general,
They have high melting points.
They are heat resistant.
They can be very hard with great strength; although a few are brittle or soft; for example, graphite.
They are durable (last for a long time).
Most are electrical insulators (cannot conduct electricity) but; graphite is an electrical conductor.
They are chemically unreactive or inert.
They are not easily oxidized.
Most are non-magnetic.