What properties are considered for selecting material for heating element?
The most important heating element characteristics are sufficient resistivity, high oxidation resistance, low-temperature coefficient of resistance, high toughness, and high melting point. Widely used heating elements are nickel-chromium alloy, iron-chromium-aluminum alloy, molybdenum disilicide, and silicon carbide.
Which of the following material used for heating element is cheaper?
Most heating elements use Nickel-chrome(NiCr) wire or ribbon as the conductor. Nickel-chrome(NiCr) is an ideal material as it is inexpensive, has relatively high resistance, and does not break down or oxidize in air in its useful temperature range.
Which material is used for making electrical heating element and why?
Explanation: Nichrome is nothing but an alloy of Nickel and chromium. It has a special characteristics that it has high boiling point as well as melting point and high resistance. Due to this reason it is used as a heating coil in electrical heating devices , more the resistance in a wire mode is the heat produced.
What are the properties of a heating element Mcq?
Properties of Nichrome:
- Resistivity: 40 µΩ cm.
- Temperature coefficient of resistance: 0.0004 / ⁰C.
- Melting point: 1400 ⁰C.
- Specific gravity: 8.4gm /cm3.
- High resistance to oxidation.
What is the best metal for heating element?
Copper has a very high thermal conductivity and is much cheaper and more available than silver, which is the best metal of all for conducting heat.
What causes heating element to crash?
One of the reasons of formation of hot spot in heating element is high rate of local oxidation that may reduce the element cross-section, thereby increasing the resistance at that spot and produces more heat locally and causing breakdown the element.
Can stainless steel be used as a heating element?
The typical heating elementsare made of steel or stainless steel. They are used in heating water or similar liquid medium for a general purpose and usually corrosion free. They are most resistant to high temperature and withstand the highly corrosive medium.