[Set 1]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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Which of the following materials is a good conductor of heat but a bad conductor of electricity?

1. Asbestos

2. Mica

3. Mercury

4. Nickel

Answer

Option 2: Mica

Explantion :

⚫Mica is a good conductor of heat but a bad conductor of electricity.

⚫ It means mica has a very capable dielectric function, making it ideally suited for applications that require an effective heat conductor and electric insulator.

⚫ Electrical current and heat are intricately linked. A conductor will resist some of the energy flow when electrons pass through it (how much resistance depends on the quality of the conductor). The energy that does not flow through the conductor is converted instead into heat energy.

⚫ This thermal energy can be used to heat up a wire so that it becomes a heating element. This is the principle behind the heat generated in a wide number of consumer appliances, such as hairdryers, toasters, electric iron, and heaters.

⚫ These appliances, while creating heat, must be safe to use and consistently capable to operate efficiently. Therefore they require an electrical insulator which will not prevent heat from being generated. Hence mica is used in those appliances.

⚫ Because mica is an insulating material that does not conduct electricity, it provides advanced electrical insulation between electric circuit lines and is widely used as a material in wiring boards and as the basis for electronic components.

⚫ Mica is used in various components such as capacitors and resistors because its superior dielectric strength will help guarantee the high performance of key electrical instruments.

At the same time, its heat-conductive properties mean it can offer an assured level of protection.

⚫ Mica provides resistance to temperatures up to 650°C and can withstand powerful electric fields.

⚫ In product form for the power electronics industry, mica comes in tubes and as manufactured components such as transistor parts, heating elements, washers, and gaskets.

mica has good thermal conductivity due to phonons, but doesn’t have sufficient free electrons to be a good conductor of electricity. Therefore mica is a bad conductor of electricity.

FAQ’s on Mica

Is mica a conductor or insulator or semiconductor?

mica is a good conductor of heat but bad conductor of electricity

Is mica an example of insulator?

Yes, Mica is a good electrical insulator

Is mica a heat conductor?

Yes, mica is an effective heat conductor

Is manganin a conductor or insulator?

Manganin wire is also used as an electrical conductor in cryogenic systems, minimizing heat transfer between points which need electrical connections

What type of metal is mica?

Mica is a non metallic mineral

Is mica a semiconductor?

Mica behave as a semiconductor when thinned down to a few molecular layers

Which class of insulator is mica?

Class B insulation

What is mica material?

mica is any of a group of hydrous potassium, aluminum silicate minerals.

What is mica used for?

Mica is a naturally occurring mineral dust often used in makeup foundations, as filler in cement and asphalt, and as insulation material in electric cables.

Why mica is used in the electric Industry?

Because of low power loss factor, insulation and resistance to high voltage, it is highly used in electric and electronic industries.

What are the properties of mica?

chemically inert, dielectric, elastic, flexible, hydrophilic, insulating, lightweight, platy, reflective, refractive, resilient, and range in opacity from transparent to opaque. Mica is stable when exposed to electricity, light, moisture, and extreme temperatures.

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