Electrical Heating Purposes Quiz

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What are the purposes of electrical heating?

Room heaters for domestic purposes, melting of metals for industrial purposes (correct)
Electric irons for domestic purposes, moulding of glass for industrial purposes
Hot plates for cooking, making of insulators for industrial purposes
Immersion heaters for water heating, electric toasters for domestic purposes

What are the advantages of electrical heating?

The system does not produce any flue gas, simple and accurate temperature control, economical (correct)
Complex temperature control, high initial cost, no protection against overheating
High maintenance cost, no protection against overcurrents, not suitable for accurate heating
Produces flue gas, requires high cost of cleaning, no temperature control

Explain briefly the following modes of heat transfer:

Convection: under what conditions heat transfer by convection is efficient. Radiation: different methods of heat transfer.
Conduction: different methods of heat transfer. Convection: under what conditions heat transfer by convection is efficient.
Radiation: describe the modes of heat transfer. Conduction: under what conditions heat transfer by conduction is efficient.
Convection: describe the modes of heat transfer. Radiation: what are different methods of heat transfer and under what conditions heat transfer by radiation is efficient. (correct)

What are the different purposes of electrical heating?

The different purposes of electrical heating include immersion heaters for water heating, room heaters for domestic purposes, hot plates for cooking, electric irons, melting of metals, moulding of glass, electric toasters, and making of insulators for industrial purposes. Signup and view all the answers

What are the advantages of electric heating?

The advantages of electric heating include the absence of flue gas production, cleanliness requiring minimum cost of cleaning, simple and accurate temperature control, economical cost in terms of initial and maintenance costs, automatic protection against overcurrents or overheating, and the ability to perform special types of heating accurately. Signup and view all the answers

Explain the modes of heat transfer and under what conditions heat transfer by radiation is efficient.

The modes of heat transfer include conduction, convection, and radiation. Heat transfer by radiation is efficient under conditions where direct line of sight between the heat source and the object to be heated is available, and the intervening medium does not absorb or scatter the radiation significantly. Signup and view all the answers

What are the specific methods of heat transfer?

The specific methods of heat transfer are conduction, convection, and radiation. Signup and view all the answers

What are the different industrial applications of electrical heating?

The different industrial applications of electrical heating include melting of metals, moulding of glass, and making of insulators. Signup and view all the answers