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Home » Engineering » Chemical Engineering » Aptitude Test - 4
1.For a grey surface?
A. Emissivity is constant
B. Absorptivity equals reflectivity
C. Emissivity equals transmissivity
D. Emissivity is constant
2.Which quantity can be neglected for gases?
A. Transmissivity
B. Absorptivity
C. Reflectivity
D. Transmissivity
3.Absorptivity of a body is equal to its emissivity?
A. At shorter wavelengths
B. At one particular temperature
C. For a polished surface
D. At shorter wavelengths
4.Radiation heat transfer is characterized by?
A. Due to bulk fluid motion, there is a transport of energy
B. Thermal energy transfer as vibrational energy in the lattice structure of the material
C. Movement of discrete packets of energy as electromagnetic waves
D. Due to bulk fluid motion, there is a transport of energy
5.Radiation heat transfer is characterized by?
A. Due to bulk fluid motion, there is a transport of energy
B. Thermal energy transfer as vibrational energy
C. Movement of discrete packets of energy as electromagnetic waves
D. Due to bulk fluid motion, there is a transport of energy
6.Which is true regarding radiation?
A. Radiation travels only in medium
B. Radiation travels without any medium
C. Radiation travels in medium but sometimes without medium
D. Radiation travels only in medium
7.Radiation exchange occurs in?
A. Gas
B. Liquid
C. Vacuum
D. Gas
8.Energy released by a radiating surface is not continuous but is in the form of successive and separate packets of energy called?
A. Neutrons
B. Electrons
C. Protons
D. Neutrons
9.Thermal radiations occur in the portion of electromagnetic spectrum between the wavelengths?
A. 10 -2 to 10 -4 micron
B. 0.1 to 10 2 micron
C. 10 -1 to 10 -2 micron
D. 10 -2 to 10 -4 micron
10.A perfectly black body?
A. Absorbs all the incident radiation
B. Reflects all the incident radiation
C. Allow all the incident radiation to pass through it
D. Absorbs all the incident radiation
11.What is the wavelength band for cosmic rays?
A. Up to 4 * 10 -7 micron meter
B. Up to 19 * 10 -7 micron meter
C. Up to 23 * 10 -7 micron meter
D. Up to 4 * 10 -7 micron meter
12.For a prescribed wavelength a black body radiates how much energy at the temperature of body?
A. 50%
B. 20%
C. Minimum
D. 50%
13.The interchange factor is also known as?
A. Shape factor
B. Radiosity
C. Irradiation
D. Shape factor
14.For the same type of shapes, the value of the radiation shape factor will be higher when?
A. Surfaces are closer
B. Surfaces are moved further apart
C. Surfaces are smaller and held closer
D. Surfaces are closer
15.The grey body shape factor for radiant heat exchange between a small body (emissivity = 0.4) in a large enclosure (emissivity = 0.5) is?
A. 0.1
B. 0.2
C. 0.4
D. 0.1
16.An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers are?
A. 0.50
B. 0.75
C. 0.1
D. 0.50
17.The value of shape factor depends on how many factors?
A. 1
B. 2
C. 3
D. 1
18.Which of the following is a wrong statement according to the shape factor is equal to one?
A. Inside cylinder to outer cylinder of a long co-axial cylinder
B. For a flat or convex surface with respect to itself
C. For infinite parallel planes radiating only to each other
D. Inside cylinder to outer cylinder of a long co-axial cylinder
19.Establish a relation for the shape factor of cylindrical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plate?
A. h/4 h + d
B. 4 h + d/4 h
C. 4 h + d/h
D. h/4 h + d
20.The reciprocity theorem states that?
A. F 12 = F 21
B. A 1 F 12 = A 2 F 21
C. A 1 F 21 = A 2 F 12
D. F 12 = F 21
21.Two radiating surface A 1 = 6 m2 and A 2 = 4 m2 have shape factor F 12 = 0.1. Then the shape factor F 21 will be?
A. 0.10
B. 0.15
C. 0.18
D. 0.10
22.What is the value of shape factor for two infinite parallel surfaces separated by a distance x?
A. 0
B. 1
C. x
D. 0
23.What is the shape factor of a sphere of diameter d inside a cubical box of length l = d?
A. π/4
B. π/3
C. 2 π/6
D. π/4
24.What is the shape factor of hemispherical surface closed by a plane surface of diameter d?
A. 0.5
B. 1
C. 1.5
D. 0.5
25.What is the shape factor for a hemispherical bowl with respect to itself of diameter d? The cavity is closed on its outer surface with a flat plate?
A. 2.5
B. 0.5
C. 1
D. 2.5
26.Establish a relation for shape factor for a conical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plate?
A. 1 – d/ (h 2 + d 2) 1/2
B. 1 – d/ (4 h + d 2) 1/2
C. 1 – d/ (4 h 2 + d 2) 1/2
D. 1 – d/ (h 2 + d 2) 1/2
27.Interchange factor for body 1 completely enclosed by body 2 (body 1 is large) is given by?
A. 3/ [1/E 1 + A1/A2 (1/E 2 – 1)].
B. 4/ [1/E 1 + A1/A2 (1/E 2 – 1)].
C. 1/ [1/E 1 + A1/A2 (1/E 2 – 1)].
D. 3/ [1/E 1 + A1/A2 (1/E 2 – 1)].
28.Interchange factor for infinitely long concentric cylinders is given by?
A. 1/ [1/E 1 + A1/A2 (1/E 2 – 1)].
B. 2/ [1/E 1 + A1/A2 (1/E 2 – 1)].
C. [1/E 1 + A1/A2 (1/E 2 – 1)].
D. 1/ [1/E 1 + A1/A2 (1/E 2 – 1)].
29.What is the geometric factor for infinitely long concentric cylinders?
A. 0.75
B. 0.33
C. 0.5
D. 0.75
30.What is the geometric factor for concentric spheres?
A. 0.95
B. 1
C. 0.33
D. 0.95
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