Page 271 - Electrician - TT (Volume 2)
P. 271
ELECTRICIAN - CITS
A bread carriage moves up and down inside the toaster walls and usually has an external control lever. The
carriage when at down position operates a switch that turns the toaster ‘on’ and vice versa.
Heating elements, made of flat Nichrome wires, are positioned on both sides of the toaster wall. When current
flows through them, they radiate heat fortoasting.
A mechanical timer inside the toaster is linked to a toast colour control outside. The control enables the user to
adjust the toasting time for different types of breads or to suit the user’s preference.
Washing machine
Objectives: At the end of this lesson you shall be able to:
• explain the washing machine
• state the types of washing machines and wash techniques
• state the function of mangle wringer for drying
• explain the function of drain pump and drive motor
• state the points to be noted while placing the washing machine at a suitable place.
Washing machine
It is a domestic electric appliance which is used to soak, rinse, wash, wringle /dry the cloth/fabrics etc.
Types of washing machines: The modern washing machines can be divided roughly into three main groups
according to their function.
They are
– Ordinary
– Semi automatic
– Fully automatic.
i Ordinary type
Ordinary without timer: This machine uses the pulsator type technique in which a disc is fitted to the motor.
It has only one tub and one motor the dirty cloth is loaded in the tub, water is filled manually in the tub, detergent
is added. The motor is switched on the pulsator disc moves the cloth around the tub and the time duration of
washing is decided by the operator.
Ordinary with timer: Similar to the ordinary type, but added with a clock timer to select the time of wash from 1
to 15 minutes.
ii Semi-automatic type
This type has two tubs. One for washing and rinsing, the other for spin drying the cloths. The washing tub
operates at lower speed whereas the spin drier tub operates at a higher speed. The machine may contain either
one or two motors.
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CITS : Power - Electrician & Wireman - Lesson 101-103
