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WorksheetsControlling Temperature in Household Appliances
Total questions: 10
Worksheet time: 2mins
The device used to regulate temperature in household appliances is called a:
Thermometre
Thermostat
Temperature Gauge
The main component in a thermostat is a:
Temperature Setting Knob
Bimetallic Strip
Contact Screw
True or false, a bimetallic strip is made of two metals with different expansion coefficient.
True
False
The device in the photograph represents different types of:
Thermostats
Thermometre
Testers
Which of the following explanation gives the correct reason for the bimetallic strip bending upward after heating?
the side of the strip facing the heat has a higher expansion coefficient
the side of the strip facing the heat has a lower expansion coefficient
the strip is not being heated properly
The bimetallic strip in the photograph bends downward because:
The metal with the lower expansion coefficient is on the upper side of the bimetallic strip.
The metal with the higher expansion coefficient is on the upper side of the bimetallic strip.
the flame is very close to the strip
Brass expands faster than steel when heated. In the photograph, which side of the labelled strip correctly represents these two metals:
X - brass Y - steel
X - steel Y - brass
Brass expands faster than steel when heated. Bimetallic strip returns to its original shape (straightens) after removing the flame because:
steel contracts faster than brass
brass contracts faster than steel
both contracts at the same rate
True or false, in a cooling appliance the bimetallic strip is positioned so that the metal having the lower expansion coefficient faces the temperature setting knob?
true
false
Thermostats functions on the principle that:
some metals expands and contracts at different rates
all metal expands and contracts at different rates
all metals expands and contracts at the same rates
