Electrical Heating MCQ Part 3

Electrical Heating MCQ Part 3

Electrical Heating MCQ Part 3

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Attempt Free Electrical Heating MCQ Part 3 Here. Read The Important Electrical MCQ From Below.

Q1. In an electric room heat convector the method of heating used is

 A. arc heating

 B. resistance heating

 C. induction heating

 D. dielectric heating

Answer : B

Q2. Property of low temperature co-efficient of heating element is desired due to which of the following reasons ?

 A. To avoid initial rush of current

 B. To avoid change in kW rating with temperature

 C. Both (a) and (b)

 D. Either (a) or (b)

Answer : C

Electrical Heating MCQ Part 3

Q3. In heating the ferromagnetic material by induction heating, heat is produced due to

 A. induced current flow through the charge

 B. hysteresis loss taking place below curie temperature

 C. due to hysteresis loss as well as eddy current loss taking place in the charge

 D. none of the above factors

Answer : C

Q4. For the transmission of heat from one body to another

 A. temperature of the two bodies must be different

 B. both bodies must be solids

 C. both bodies must be in contact

 D. at least one of the bodies must have some source of heating

Answer : A

Electrical Heating MCQ Part 3

Q5. The temperature inside a furnace is usually measured by which of the following?

 A. Optical pyrometer

 B. Mercury thermometer

 C. Alcohol thermometer

 D. Any of the above

Answer : A

Q6. In a domestic cake baking oven the temperature is controlled by

 A. voltage variation

 B. thermostat

 C. auto-transformer

 D. series-parallel operation

Answer : D

Electrical Heating MCQ Part 3

Q7. Which of the following methods is used to control temperature in resistance furnaces ?

 A. Variation of resistance

 B. Variation of voltage

 C. Periodical switching on and off of the supply

 D. All of the above methods

Answer : D

Q8. Radiant heating is used for which of the following ?

 A. Annealing of metals

 B. Melting of ferrous metals

 C. Heating of liquids in electric kettle

 D. Drying of paints and varnishes

Answer : D

Electrical Heating MCQ Part 3

Q9. ____ has the highest value of thermal conductivity.

 A. Copper

 B. Aluminium

 C. Brass

 D. Steel

Answer : A

Q10. Heat transfer by condition will not occur when

 A. bodies are kept in vacuum

 B. bodies are immersed in water

 C. bodies are exposed to thermal radiations

 D. temperatures of the two bodies are identical

Answer : D

Electrical Heating MCQ Part 3

Q11. Which of the following will happen if the thickness of refractory wall of furnace is increased ?

 A. Heat loss through furnace wall will increase

 B. Temperature inside the furnace will fall

 C. Temperature on the outer surface of furnace walls will drop

 D. Energy consumption will increase

Answer : C

Q12. In an electric press mica is used

 A. as an insulator

 B. as a device for power factor im­provement

 C. for dielectric heating

 D. for induction heating

Answer : A

Electrical Heating MCQ Part 3

Q13. It is desirable to operate the arc fur­naces at power factor of

 A. zero

 B. 0.707 lagging

 C. unity

 D. 0.707 leading

Answer : B

Q14. Which of the following devices is necessarily required for automatic tempera­ture control in a furnace?

 A. Thermostat

 B. Thermocouple

 C. Auto-transformer

 D. Heating elements of variable resistance material

Answer : B

Electrical Heating MCQ Part 3

Q15. Which of the following is an advantage of heating by electricity ?

 A. Quicker operation

 B. Higher efficiency

 C. Absence of flue gases

 D. All of the above

Answer : D

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