Heat Transfer Quiz 2
Heat Transfer Quiz
Test your knowledge on the principles of heat transfer with our engaging Heat Transfer Quiz. This quiz encompasses various aspects of heat transfer, focusing particularly on convective and radiative mechanisms.
Prepare to challenge yourself with questions that cover:
- Grashof number and natural convection
- Heat absorption coefficients
- Heat loss calculation in piping systems
- Constant heat flux conditions
- Radiation heat exchange between surfaces
For calculation of heat transfer by natural convection from a horizontal cylinder, what is the characteristic length in Grashof number?
Diameter of cylinder
Length of the cylinder
Circumference of the base of the cylinder
Half the circumference of the base of the cylinder
Given that p Joules of heat is incident on a body and out of it q Joules is reflected and transmitted by it. The absorption coefficient of the body is
P – q
Q /p
(q – p)p
(p – q)/p
Oil at 150°C flows slowly through a long thin walled pipe of 30 mm inner diameter. The pipe is suspended in a room for which the air temperature is 20°C and convection coefficient at the outer tube surface is 11 W/m2K. The heat lost per unit length of tube is __W.
134.75
151.36
187.56
149.32
Water enters a very long tube having an inner diameter of 0.01 m with velocity and temperature 0.01 m/s and 30°C respectively. The average difference between the tube inner surface and bulk mean temperature of water is 10°C. The value of constant and uniform heat flux imposed on the tube is ___________ W/m2. [Take the properties of water at mean bulk emperature of 40°C as ρ = 990 kg/m3, ν = 0.65 × 10 –6m2/s; c = 4178 J/kgK, k = 0.62 W/mK; Pr = 4.3].
2566.3
27032
2899.7
2109.8
The radiation heat exchange between two large parallel steel plates of emissivities 0.7 and 0.5 held at temperatures of 1000 K and 500 K respectively, if a thin copper plate of emissivity 0.1 is introduced as a radiation shield between the two plates is
3250.25 W/m2
3000.25 W/m2
2680.625 W/m2
2480.625 W/m2
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