Page 279 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Fully automatic washing machine:
Unlike the semi-automatic one, a fully automatic washing machine doesn’t require manual work. You just have
to load the clothes and feed the washing program to the machine. The machine takes care of the rest. It washes
and dries the clothes in the same tub. Fully automatic washing machines come in two categories – front load and
top load.

High-end fully automatic washing machines are engineered with excellent wash programs and multiple functions
such as soak, pre-soak, rinse and pre-rinse.
Washing machines typically have several types of timers:

1 Cycle Timer: Controls the duration of each washing cycle.
2 Delay Timer: Allows you to set a delay before the washing cycle starts.
3 Program Timer: Selects the specific washing program (e.g., normal, delicate, heavy - duty).

4 Spin Timer: Determines the duration of the spin cycle.
5 Rinse Timer: Controls the length of the rinse cycle.
These timers work together to ensure efficient and effective washing of clothes.
Power supply in washing machine :
A conventional power supply system of a washing machine is realized through a power cord 100 which is connected
to a source of power whose voltage is either 110 V or 220 V for household use, a power switch 101 that has one
end connected to the power cord 100, and is turned on or off in order to either supply power.
Vacuum cleaner:
A vacuum cleaner, also known simply as a vacuum, or a hoover, is a device that uses suction in order to remove
dirt and other substances from floors, upholstery, draperies, and other surfaces. It is generally electrically driven.

The vacuum cleaner is nothing but an electric device that makes use of an air pump to suck up dirt and dust from
the floor and other surfaces. The type of cleaning you do will determine the suitable vacuum cleaner you will need,
as there are many options available to choose from. You will have the best cleaning experience with vacuum
cleaners, whether you use them at home or commercial place.
Block Diagram Of Vacuum Cleaner:

Working principle of the vacuum cleaner:
Materials flow from one location to another when a pressure difference is created between two locations. This
phenomenon is the basic working principle of an ideal vacuum cleaner. When a centrifugal fan rotates it makes
the air to flow by adding it external kinetic energy. Air is sucked from behind and pushed forward with pressure and
so negative pressure it creates behind the fan. An ideal vacuum cleaner has such centrifugal fan in it connected
to a motor. This unit has suction and discharge connections, on the suction side filter bag is fitted before the hose
connection. The discharge has another air purifier filter and opened to the atmosphere. When the electric power
is given the motor rotates and so the centrifugal fan. Air from the suction side is sucked into the unit, along with

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CITS : E & H - Electronics Mechanic - Lesson 160 - 179