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Glossary of terms you will come across during your Phase 2 training.


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B

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Engine top dead centre, bottom dead centreBottom Dead Centre: The instant at which the piston in an engine has reached its lowest point within the cylinder. It is called "dead" centre, because the piston has finished its downwards movement, and stops (hence the use of the term "dead") before commencing its upward movement.

At BDC, the small end, big end and main bearings are in one straight line.

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Straight cut bevel gear, used to turn drive through 90 degrees.

Bevel gears are used to turn drive through 900.

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Brake Horse Power: The amount of power that is available at the flywheel of an engine. Power is generated in the combustion chambers, but due to mechanical inefficiencies and losses, not all the power becomes available at the flywheel. The amount of power at the flywheel is measured by running the engine against some form of absorbtion brake, hence the term BRAKE Horsepower.
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In the context of the study of DC electricity and electronics, bias describes when we deliberately apply a certain DC voltage to one electrode relative to another.
For example, if we apply a certain voltage to the anode of a diode that is higher than the voltage on the cathode, we have 'forward biased' the diode.
Once this voltage bias exceeds a certain value (the forward voltage of the diode), current will flow through the diode.
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Exploded view of connecting rod.

Big End; Small End

The terms 'big end' and 'small end' refer to the ends of the connecting rod (con rod) in an engine.

The big end of the con rod is bolted on to the big end journal of the crankshaft. Shell bearings are fitted here (the big end bearings), and there is always full film lubrication between the bearings and the crankshaft when the engine is running.

The small end of the con rod has the gudgeon pin passing through it, and it is used to attach the piston to the con rod.

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Bin Collection:

  • Size of Bin: 1100 litre
  • Type: General waste

Contact number: 1890 500 800

Account number: DF6541

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Greenstar:

  • Bin Type: 1100 Litre, General Waste
    Telephone No: 1890 500 800
    Account No: DF6541
    Address: 116 Grange Way, Baldoyle Industrial Estate, Dublin 15.
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When people use numbers, we use 0,1,2,3,4,5,6,7,8,9. This is known as the denary system. When computers or electronic components have to deal with numbers, they can only understand the concept of something being switched on or switched off. Something switched off equates to a 0, Something swtiched on equates to a 1. This is all they can understand: 1's and 0's. This is the binary system.

Check here for more information on how to convert binary/denary numbers.

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In the context of electronics, transistors are referred to as being bipolar. They are called bipolar because both positive charge carriers (holes) and negative charge carriers (electrons) are involved in the operation of transistors.

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A binary digit, either a 1 or a 0.  The word "bit" is formed from these 2 words-binary digit = bit

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