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Test: Basic Concepts of Heat Transfer - 3


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10 Questions MCQ Test Heat Transfer | Test: Basic Concepts of Heat Transfer - 3

Test: Basic Concepts of Heat Transfer - 3 for Chemical Engineering 2022 is part of Heat Transfer preparation. The Test: Basic Concepts of Heat Transfer - 3 questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Basic Concepts of Heat Transfer - 3 MCQs are made for Chemical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Basic Concepts of Heat Transfer - 3 below.
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Test: Basic Concepts of Heat Transfer - 3 - Question 1

Consider the following materials:
1. Carbon
2. Mica
3. Bakelite
4. Fibreglass
Q. Which of these materials are good conductors- of heat, but bad conductors of electricity

Detailed Solution for Test: Basic Concepts of Heat Transfer - 3 - Question 1

Mica, Bakelite and fibre glass are insulator material and carbon in the form of diamond is the good conductor of heat but bad conductor of electricity

Test: Basic Concepts of Heat Transfer - 3 - Question 2

In which of the following material non-isotropic conductivity is exhibited

Detailed Solution for Test: Basic Concepts of Heat Transfer - 3 - Question 2

Wood is considered as orthotropic material since property of grain along the wood is different and across the grain is different.

Test: Basic Concepts of Heat Transfer - 3 - Question 3

Which one of the following have a highest thermal conductivity?

Detailed Solution for Test: Basic Concepts of Heat Transfer - 3 - Question 3

Test: Basic Concepts of Heat Transfer - 3 - Question 4

Thermal diffusivity is

Test: Basic Concepts of Heat Transfer - 3 - Question 5

Your finger sticks to an ice tray just taken from the refrigerator, Which factor has more effect on this phenomenon?

Detailed Solution for Test: Basic Concepts of Heat Transfer - 3 - Question 5

Due to high temperature difference between your finger and the tray, some heat will be transferred to the tray, depending on its capacity for thermal conductivity.
Since the surface of your skin is naturally moisturized (it’s not a function of the air humidity), the loss of heat will cause a thin layer of ice to form on the skin which in turn sticks to the tray. No matter how dry is the air and how cold is the freezer, your finger will not stick to a wooden tray whose thermal conductivity is low. So the most important factor is the thermal conductivity of the tray.

Test: Basic Concepts of Heat Transfer - 3 - Question 6

Which one of the following is correct, in context of thermal diffusivity of liquid and gas

Detailed Solution for Test: Basic Concepts of Heat Transfer - 3 - Question 6

Since thermal diffusivity, α = k/ρc
(ρC)liquid > (ρC)gas
αgas > αliquid

Test: Basic Concepts of Heat Transfer - 3 - Question 7

The unit of thermal diffusivity is

Detailed Solution for Test: Basic Concepts of Heat Transfer - 3 - Question 7

Thermal diffusivity, α = K/ρC
Hence its unit = m2/hr or m2/sec
Note that unit of thermal diffusivity and kinematic viscosity is same.

Test: Basic Concepts of Heat Transfer - 3 - Question 8

The concept of overall heat transfer is used in the heat transfer in the case of

Detailed Solution for Test: Basic Concepts of Heat Transfer - 3 - Question 8

Note that the concept of overall heat transfer is useful in combined mode of heat transfer like conduction and convection

Test: Basic Concepts of Heat Transfer - 3 - Question 9

Hot coffee in a cup is allowed to cool, its cooling rate is measured and found to be greater than the value calculated by conduction, convection and radiation measurement. The difference is due to

Test: Basic Concepts of Heat Transfer - 3 - Question 10

The ratio of thermal conductivity to electrical conductivity is equal to

Detailed Solution for Test: Basic Concepts of Heat Transfer - 3 - Question 10

The ratio of thermal conductivity to electrical conductivity is always constant for all the conductors at the given temperature. This is know as Wideman and Frange law.

The constant is known as Lorentz number (Lo) whose value is equal to 2.045 x 10-8 W/μK2.

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