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Home » Engineering » Chemical Engineering » Aptitude Test - 3
1.Heat transfer takes place according to which law?
A. First law of thermodynamics
B. Newton’s second law of motion
C. Second law of thermodynamics
D. First law of thermodynamics
2.Heat transfer takes place in liquids and gases is essentially due to?
A. Convection
B. Conduction
C. Radiation
D. Convection
3.The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by?
A. Newton’s law of cooling
B. Kirchhoff’s law
C. Wein’s displacement law
D. Newton’s law of cooling
4.Identify the wrong statement?
A. Heat flow doesn’t depend on temperature
B. A material medium is not necessary for heat transmission
C. The process of heat transfer is an irreversible process
D. Heat flow doesn’t depend on temperature
5.Most unsteady heat flow occurs?
A. Through the walls of the refrigerator
B. During annealing of castings
C. Through the walls of the furnace
D. Through the walls of the refrigerator
6.The famous Fourier series is named after?
A. Wein’s
B. Stefan- Boltzmann
C. J.B. Joseph Fourier
D. Wein’s
7.Fourier law of heat conduction is best represented by?
A. Q = k d t/d x
B. Q = -k A
C. Q = k A d x/d t
D. Q = k d t/d x
8.Here are some assumptions that are made for Fourier law. Identify the wrong one?
A. Isotropic and homogeneous material
B. Non- linear temperature profile
C. Steady state heat conduction
D. Isotropic and homogeneous material
9.Transmission of heat i.e. molecular is smallest in case of?
A. Solids
B. Alloys
C. Liquids
D. Solids
10.Which one is not the unit of thermal conductivity?
A. Cal/cm s K
B. W/m s K
C. KJ/m hr K
D. Cal/cm s K
11.Which of the following is the unit of thermal resistance?
A. Degree/kcal
B. Hour degree
C. S degree/kcal
D. Degree/kcal
12.The value of transmissivity may vary from?
A. 4-5
B. 3-4
C. 1-2
D. 4-5
13.A cavity with a small hole will always behave as a?
A. Opaque body
B. Black body
C. Transparent body
D. Opaque body
14.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
15.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
16.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
17.With respect to incident radiation, transmissivity varies with?
A. Time
B. Wavelength
C. Temperature
D. Time
18.A body through which all the incident radiations passes, is called?
A. Transparent body
B. Opaque body
C. Black body
D. Transparent body
19.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
20.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
21.Which one is true regarding gases?
A. Transmissivity is zero
B. Reflectivity is zero
C. Absorptivity is zero
D. Transmissivity is zero
22.Thin glass plate is an example of?
A. White body
B. Black body
C. Opaque body
D. White body
23.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
24.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
25.Which one is true for an opaque body?
A. Reflectivity is unity
B. Absorptivity is zero
C. Reflectivity is zero
D. Reflectivity is unity
26.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
27.What is the absorptivity of the gray body?
A. 2.5
B. 2
C. Unity
D. 2.5
28.A body that reflects all the incident thermal radiations is called a?
A. Specular body
B. Black body
C. Gases
D. Specular body
29.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
30.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
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