[Set 3]MCQ’s On Electrical Heating|Electrical Heating MCQ Questions And Answers|KSEB Sub Engineer

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Electrical Heating MCQ Questions and Answers

[Set 1]MCQ’s on Electrical Heating|Electrical Heating MCQ Questions and Answers|KSEB Sub Engineer
[Set 2]MCQ’s on Electrical Heating|Electrical Heating MCQ Questions and Answers|KSEB Sub Engineer
[Set 3]MCQ’s on Electrical Heating|Electrical Heating MCQ Questions and Answers|KSEB Sub Engineer

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Question 1

Which of the following properties is true for good heating element?

1. High temperature coefficient of resistance

2. Low oxidizing temperature

3. Low temperature coefficient of resistance

4. Low melting temperature

Answer

option 3 .Low temperature coefficient of resistance

Explanation

Heating element

Heating elements are used to convert electrical energy to heat energy
The electric current through the element encounters resistance which results in the heating ofthe element.
It is the part of electric devices such as iron boxes, heater

Question 2

As per Stefan’s law of radiation, heat radiated by com body surface is:

1. Directly proportional to the squaresolute temperature

2. Inversely proportional t fourth power of its absolute temperature

3. Directly proportional to the fourth power of its absolute temperature

4. Inversely proportional to the square of its absolute temperature

Answer

Option 3: Directly proportional to the fourth power of its absolute temperature

Explanation:

Stefan-Boltzmann law, states that the radiant heat energy emitted from a unit area of the black body in one second (E) is directly proportional to the fourth power of its absolute temperature, or E = σ x T⁴.

E is the emissive power of a blackbody, T is lute temperature, and a (= 5.67 X 10-8W/m2/K4) is the Stefan-Boltzmann constant. It is applicable to the Black body.

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