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Home » Engineering » Aptitude Test - 26
Hassan
1.For liquids, thermal conductivity is governed by the relation?
A. k = A c p p8/3/M1/3
B. k = A c p p4/3/M1/3
C. k = 2A c p p4/3/M2/3
D. k = A c p p8/3/M1/3
2.The thermal conductivity and the electrical conductivity of a metal at absolute temperature are related as?
A. k/T
B. k σ/T
C. k/σ
D. k/T
3.The relation Ϫ2 t =0 is referred to as?
A. Laplace equation
B. Solution for transient conduction
C. Fourier heat conduction equation
D. Laplace equation
4.The unit of thermal diffusivity is?
A. m/hr-K
B. m2/hr
C. kcal/m2-hr
D. m/hr-K
5.The diffusion equations?
A. Temperature doesn’t depends on time
B. There is no internal heat generation
C. Steady state conditions prevail
D. Temperature doesn’t depends on time
6.The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there?
A. One
B. Two
C. Three
D. One
7.Unit of the rate of heat transfer is?
A. Watt
B. Pascal
C. Newton
D. Watt
8.Convective heat transfer coefficient doesn’t depend on?
A. Surface area
B. Space
C. Time
D. Surface area
9.The rate equation used to describe the mechanism of convection is called Newton’s law of cooling. So rate of heat flow by convection doesn’t depend on?
A. Convective heat transfer coefficient
B. Surface area through which heat flows
C. Time
D. Convective heat transfer coefficient
10.How many types of convection process are there?
A. One
B. Two
C. Three
D. One
11.Thermal conductivity is maximum for which substance?
A. Ice
B. Diamond
C. Aluminum
D. Ice
12.A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body?
A. 697.2 W/m2
B. 786.9 W/m2
C. 324.7 W/m2
D. 697.2 W/m2
13.Which of the following is an example of forced convection?
A. Heat exchange on cold and warm pipes
B. Cooling of billets in the atmosphere
C. Flow of water in condenser tubes
D. Heat exchange on cold and warm pipes
14.Regarding one dimensional heat transfer, choose the correct statement?
A. Steady- f (y, z), Unsteady- f (y)
B. Steady- f (x, y, t), Unsteady- f (x)
C. Steady- f (x, t), Unsteady- f (x)
D. Steady- f (y, z), Unsteady- f (y)
15.Which statement is true regarding steady state condition?
A. There is a variation in temperature in the course of time
B. It is a function of space and time coordinates
C. Heat exchange is constant
D. There is a variation in temperature in the course of time
16.Which of the following is an example of steady state heat transfer?
A. Chilling effect of cold wind on a warm body
B. Electric bulb cools down by the surrounding atmosphere
C. Cooling of I.C engine
D. Chilling effect of cold wind on a warm body
17.Heat transfer in a long, hollow cylinder which is maintained at uniform but different temperatures on its inner and outer surfaces may be assumed to be taking place in which direction?
A. Axial only
B. Unpredictable
C. Radial only
D. Axial only
18.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
19.Heat transfer takes place in liquids and gases is essentially due to?
A. Convection
B. Conduction
C. Radiation
D. Convection
20.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
21.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
22.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
23.The famous Fourier series is named after?
A. Wein’s
B. Stefan- Boltzmann
C. J.B. Joseph Fourier
D. Wein’s
24.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
25.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
26.Transmission of heat i.e. molecular is smallest in case of?
A. Solids
B. Alloys
C. Liquids
D. Solids
27.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
28.Which of the following is the unit of thermal resistance?
A. Degree/kcal
B. Hour degree
C. S degree/kcal
D. Degree/kcal
29.The value of transmissivity may vary from?
A. 4-5
B. 3-4
C. 1-2
D. 4-5
30.A cavity with a small hole will always behave as a?
A. Opaque body
B. Black body
C. Transparent body
D. Opaque body
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