Specifications

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4. The purpose of thermostat in Automatic iron box is to
A) increase temperature B) decrease temperature
C) regulate temperature D) monitor temperature
5. In bimetallic thermostat,
i) one metal plate has a high rate of expansion when heated and the other has low rate
ii) both metal has same rate of expansion when heated
A) i alone is correct B) ii alone is correct C) both are correct D) both are wrong
Part - B
Answer the following questions in one or two words (1 Mark)
1. Electric iron box converts electric energy into heat energy. Say TRUE or FALSE.
2. Which part of electric iron is used to keep the heating element firmly against the sole-plate?
3. Name the material used to make the heating element of electric iron box.
4. What kind or water is recommended for filling into the tank in steam iron box?
5. What are the possible causes if the heat produced in electric iron box is insufficient.
Part - C
Answer the following questions briefly (4 Marks)
1. Write the features of two forms of heating element used in electric iron box.
2. State the function of i) sole plate and ii) pressure plate
3. Distinguish between Non-automatic and Automatic Iron box
4. What is the purpose of pilot lamp in Automatic iron box? What does it indicates when it is
i) glowing and ii) not glowing
5. Ordinary water is not recommended in steam iron box. Why?
Part - D
Answer the following questions in two page level (20 Marks)
1. Explain the construction and working of Non-automatic iron box. Also discuss in what way
Automatic iron box differs from Non-automatic type.
2. Stating the function of bimetallic thermostat, explain briefly the construction and working of
Automatic iron box.