EKC 394 Chemical Engineering Laboratory II Thermal Conductivity of Insulating Powders
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EKC 394 Chemical Engineering Laboratory II Thermal Conductivity of Insulating Powders

This quiz covers the determination of the thermal conductivity of insulating powders such as kaolin, magnesium oxide, and mica, along with an evaluation of the effect of temperature on the thermal conductivity of materials.

Created by
@SilentTranscendental

Questions and Answers

What is the main objective of the Thermal Conductivity of Insulating Powders experiment?

To evaluate the effect of temperature on the thermal conductivity of materials

What is the purpose of the 200 W cartridge heater in the test module?

To provide the heating source for the insulating powders

What material are the test modules fabricated from?

Stainless steel

What does each test module of the Thermal Conductivity of Insulating Powders Unit contain?

<p>At least 100g of insulating powders</p> Signup and view all the answers

What does the power control circuit provide in the Thermal Conductivity of Insulating Powders Unit?

<p>A continuously variable electrical output of 0 to 200 Watts</p> Signup and view all the answers

What does the instrumentation provided for the test module permit?

<p>Accurate measurement of temperature and power supply</p> Signup and view all the answers

What is the purpose of the thermocouple in the heater?

<p>To prevent the heating element from burning out</p> Signup and view all the answers

Which materials have very low thermal conductivity?

<p>Kaolin and magnesium oxide</p> Signup and view all the answers

What is the purpose of utilizing thermal insulators?

<p>To reduce heat losses from a hot body to the atmosphere</p> Signup and view all the answers

What are the dimensions of the inner cylinder of the test module?

<p>I.D. = 9.9 mm, Thickness = 3 mm, Length = 175 mm</p> Signup and view all the answers

What is the sheath of the thermocouples made of?

<p>Fiber glass</p> Signup and view all the answers

What is the function of the power transducer in the control panel?

<p>To measure the heat input to the heater element</p> Signup and view all the answers

What does 'q' represent in the heat flow equation q   k A dT / dx   k ( 2  r x 1) dT / dr ?

<p>Heat flow through a small element at any radius r</p> Signup and view all the answers

What is the formula for determining the conductivity of the material in terms of q, r1, r2, T1, and T2?

<p>$k q ln (r1 / r2) / 2  T1  T2 $</p> Signup and view all the answers

'ln' in the formula for determining conductivity represents:

<p>$logarithm$</p> Signup and view all the answers

'Thermal conductivity' refers to the ability of a material to:

<p>$pass heat through it efficiently$</p> Signup and view all the answers

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