Quiz – 1

Question 1

Time: 00:00:00
The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there?

2

2

1

1

3

3

4

4

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Question 2

Time: 00:00:00
An oil cooler in a high performance engine has an outside surface area 0.12 m2 and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m 2 K. Find out the heat transfer rate?

238.43 W

238.43 W

190.68 W

190.68 W

543.67 W

543.67 W

675.98 W

675.98 W

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Question 3

Time: 00:00:00
Unit of the rate of heat transfer is

Joule

Joule

Newton

Newton

Pascal

Pascal

Watt

Watt

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Question 4

Time: 00:00:00
Convective heat transfer coefficient doesn’t depend on

Surface area

Surface area

Space

Space

Time

Time

Orientation of solid surface

Orientation of solid surface

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Question 5

Time: 00:00:00
The temperature distribution in a large thin plate with uniform surface temperature will be
(Assume steady state condition)

Logarithmic

Logarithmic

Hyperbolic

Hyperbolic

Parabolic

Parabolic

Linear

Linear

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Question 6

Time: 00:00:00
Let us assume two walls of same thickness and cross-sectional area having thermal conductivities in the ratio 1/2. Let us say there is same temperature difference across the wall faces, the ratio of heat flow will be

1

1

1/2

1/2

2

2

4

4

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Question 7

Time: 00:00:00
The interior of an oven is maintained at a temperature of 850 degree Celsius by means of a suitable control apparatus. The oven walls are 500 mm thick and are fabricated from a material of thermal conductivity 0.3 W/m degree. For an outside wall temperature of 250 degree Celsius, workout the resistance to heat flow

0.667 degree/W

0.667 degree/W

1.667 degree/W

1.667 degree/W

2.667 degree/W

2.667 degree/W

3.667 degree/W

3.667 degree/W

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Question 8

Time: 00:00:00
Analysis of heat flow from the finned surface is made with the following assumptions
(i) Uniform heat transfer coefficient, h over the entire fin surface
(ii) No heat generation within the fin generation
(iii) Homogenous material
Identify the correct option

i only

i only

i and ii only

i and ii only

i, ii and iii

i, ii and iii

ii only

ii only

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Question 9

Time: 00:00:00
A heating unit is made in the form of a vertical tube of 50 mm outside diameter and 1.2 m height. The tube is fitted with 20 steel fins of rectangular section with height 40 mm and thickness 2.5 mm. The temperature at the base of fin is 75 degree Celsius, the surrounding air temperature is 20 degree Celsius and the heat transfer coefficient between the fin as well as the tube surface and the surrounding air is 9.5 W/m2 K. If thermal conductivity of the fin material is 55 W/m K, find the amount of heat transferred from the tube without fin

98.44 W

98.44 W

88.44 W

88.44 W

78.44 W

78.44 W

68.44 W

68.44 W

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Question 10

Time: 00:00:00
Which one is true for the spine?

A C = π d 2/4 and P = 4 π d

A C = π d 2/4 and P = 4 π d

A C = π d 2/4 and P = 3 π d

A C = π d 2/4 and P = 3 π d

A C = π d 2/4 and P = π d

A C = π d 2/4 and P = π d

A C = π d 2/4 and P = 2 π d

A C = π d 2/4 and P = 2 π d

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