Electric Heating MCQs

31. Which of the following is used for heating of non-conducting materials?

1. Eddy current heating
2. Arc heating
3. Dielectric heating
4. Induction heating

32. An electric iron draws 4.5 A from a 240V source. The resistance of the heating element of the iron is about

1. 5.33 Ω
2. 53.3 Ω
3. 1080 Ω
4. 0.01875 Ω

33. Which one of the following is the bread toasting zone temperature?

1. 800 °C
2. 260 °C
3. 975 °C
4. 400 °C

34. Out of the following methods of heating, the one which is independent of supply frequency is 

1. electric arc heating 
2. induction heating 
3. resistance heating
4. dielectric heating

35. A black body when heated to ____________ emits the maximum energy in the visible spectrum range.

1. 5000 °C
2. 3250 °C
3. 6250 °C
4. 8000 °C

36. Dielectric heating is an industrial method employed for heating of

1. Solids
2. Conducting materials
3. Liquids
4. Insulating materials

37. Method of heating in which the supply circuit is likely to have a leading power factor is

1. Induction heating
2. Dielectric heating
3. Resistance heating
4. Arc heating

38. Which of the following heating methods has maximum power factor?

1. Arc heating
2. Dielectric heating
3. Induction heating
4. Resistance heating

39. Which of the following heating method is based on the transformer principle?

1. Arc heating
2. Resistance heating
3. Induction heating
4. Dielectric heating

40. Which method of heating is used in the electric room converter?

1. Arc heating
2. Resistance heating
3. Induction heating
4. Dielectric heating