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Home » Engineering » Aptitude Test - 27
Hassan
1.What is the wavelength band of gamma rays?
A. 4 * 10 -7 to 1.4 * 10 -4 micron meter
B. 3 * 10 -7 to 3.4 * 10 -4 micron meter
C. 2 * 10 -7 to 2.4 * 10 -4 micron meter
D. 4 * 10 -7 to 1.4 * 10 -4 micron meter
2.Transmissivity is defined as?
A. Fraction of total energy transmitted by the body
B. Fraction of total energy reflected by the body
C. Fraction of total energy absorbed by the body
D. Fraction of total energy transmitted by the body
3.Radiant energy with an intensity of 800 W/m 2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of transmission?
A. 125.47 W/m 2
B. 135.47 W/m 2
C. 145.47 W/m 2
D. 125.47 W/m 2
4.With respect to incident radiation, transmissivity varies with?
A. Time
B. Wavelength
C. Temperature
D. Time
5.A body through which all the incident radiations passes, is called?
A. Transparent body
B. Opaque body
C. Black body
D. Transparent body
6.Reflectivity is defined as?
A. Fraction of total energy transmitted by the body
B. Fraction of total energy absorbed by the body
C. Fraction of energy reflected by the body
D. Fraction of total energy transmitted by the body
7.When a surface absorbs a certain fixed percentage of striking radiation the surface is called?
A. Opaque body
B. White body
C. Black body
D. Opaque body
8.Which one is true regarding gases?
A. Transmissivity is zero
B. Reflectivity is zero
C. Absorptivity is zero
D. Transmissivity is zero
9.Thin glass plate is an example of?
A. White body
B. Black body
C. Opaque body
D. White body
10.Radiant energy with an intensity of 800 W/m 2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of reflection?
A. 218.20 W/m2
B. 318.20 W/m2
C. 418.20 W/m2
D. 218.20 W/m2
11.The total radiant energy A impinging upon a body would be partially or totally absorbed, reflected from its surface or transmitted through it. Identify the correct statement?
A. D is the energy that is transmitted by the body
B. C is the energy that is absorbed by the body
C. B is the energy that is reflected by the body
D. D is the energy that is transmitted by the body
12.Which one is true for an opaque body?
A. Reflectivity is unity
B. Absorptivity is zero
C. Reflectivity is zero
D. Reflectivity is unity
13.Energy strikes a vertical hemispherical plate with an intensity of 640 W/m 2. The absorptivity is thrice the transmissivity and twice the reflectivity. Determine the rate of transmission?
A. 456.09 W/m2
B. 187.87 W/m2
C. 116.37 W/m2
D. 456.09 W/m2
14.What is the absorptivity of the gray body?
A. 2.5
B. 2
C. Unity
D. 2.5
15.A body that reflects all the incident thermal radiations is called a?
A. Specular body
B. Black body
C. Gases
D. Specular body
16.Energy strikes a vertical hemispherical plate with an intensity of 640 W/m2. The absorptivity is thrice the transmissivity and twice the reflectivity. Determine the rate of absorption?
A. 149.12 W/m2
B. 249.12 W/m2
C. 349.12 W/m2
D. 149.12 W/m2
17.Let 220 W/m2 of radiant energy is absorbed by a convex surface, 90 W/m2 is reflected and 40 W/m2 is transmitted through it. What is the value of absorptivity?
A. 0.42
B. 0.52
C. 0.62
D. 0.42
18.For a grey surface?
A. Emissivity is constant
B. Absorptivity equals reflectivity
C. Emissivity equals transmissivity
D. Emissivity is constant
19.Which quantity can be neglected for gases?
A. Transmissivity
B. Absorptivity
C. Reflectivity
D. Transmissivity
20.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
21.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
22.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
23.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
24.Radiation exchange occurs in?
A. Gas
B. Liquid
C. Vacuum
D. Gas
25.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
26.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
27.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
28.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
29.For a prescribed wavelength a black body radiates how much energy at the temperature of body?
A. 50%
B. 20%
C. Minimum
D. 50%
30.The interchange factor is also known as?
A. Shape factor
B. Radiosity
C. Irradiation
D. Shape factor
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