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Home » Engineering » Aptitude Test - 80
Hassan
1.The value of the wavelength for maximum emissive power is given by —
A. Wien’s law
B. Planck’s law
C. Stefan’s law
D. Wien’s law
2.Log mean temperature difference in case of counter flow compared to parallel flow will be
A. same
B. more
C. less
D. same
3.The energy distribution of an ideal reflector at higher temperatures is largely in the range of
A. shorter wavelength
B. longer wavelength
C. remains same at all wavelengths
D. shorter wavelength
4. Which of the following is used for measurement of high temperatures?
A. vapour thermometer
B. energy meter
C. resistance thermometer
D. vapour thermometer
5. If boiling water is taken to the dark side of the moon it will
A. immediately vaporize
B. immediately freeze
C. continue to boil
D. immediately vaporize
6.Which two liquids are used in the construction of minimum and maximum thermometers?
A. mercury and water
B. water and alcohol
C. mercury and alcohol
D. mercury and water
7.Which one among the following statements about thermal conductivity is correct?
A. Steel > Wood > Water
B. Steel > Water > Wood
C. Water > Steel > Wood
D. Steel > Wood > Water
8. A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on the
A. temperature of the object
B. temperature of the surroundings
C. temperature difference between the object and its surroundings
D. temperature of the object
9.Upto the critical radius of insulation,
A. Added insulation will increase heat loss
B. Added insulation will decrease heat loss
C. Convective heat loss will be less than conductive heat loss
D. Added insulation will increase heat loss
10. Unit of thermal diffusivity is
A. m²/hr
B. m²/hr °C
C. kcal/m² hr
D. m²/hr
11. The rate of energy transferred by convection to that by conduction is called
A. Stanton number
B. Nusselt number
C. Biot number
D. Stanton number
12.Thermal conductivity of wood depends on
A. Moisture
B. Density
C. Temperature
D. Moisture
13.A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C
A. 20°C
B. 40°C
C. 60°C
D. 20°C
14.The unit of overall coefficient of heat transfer is
A. W/m²K
B. W/m²
C. W/mK
D. W/m²K
15.LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is
A. Higher
B. Lower
C. Same
D. Higher
16. The transfer of heat by molecular collision is smallest in
A. Solids
B. Liquids
C. Gases
D. Solids
17.In heat exchangers, degree of approach is defined as the difference between temperatures of
A. Cold water inlet and outlet
B. Hot medium inlet and outlet
C. Hot medium outlet and cold water inlet
D. Cold water inlet and outlet
18. In a shell and tube heat exchanger, baffles are provided on the shell side to
A. Improve heat transfer
B. Provide support for tubes
C. Prevent stagnation of shell side fluid
D. Improve heat transfer
19.An ordinary passenger aircraft requires a cooling system of capacity.
A. 2 TR
B. 4 TR
C. 8 TR
D. 2 TR
20.Joule sec is the unit of
A. Universal gas constant
B. Kinematic viscosity
C. Thermal conductivity
D. Universal gas constant
21.Fourier's law of heat conduction gives the heat flow for
A. Irregular surfaces
B. Nonuniform temperature surfaces
C. One dimensional cases only
D. Irregular surfaces
22.The value of Prandtl number for air is about
A. 0.1
B. 0.3
C. 0.7
D. 0.1
23.The product of Reynolds number and Prandtl number is known as
A. Stanton number
B. Biot number
C. Peclet number
D. Stanton number
24.Heat transfer in liquid and gases takes place by
A. Conduction
B. Convection
C. Radiation
D. Conduction
25.The heat transfer takes place according to
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Zeroth law of thermodynamics
26.Which of the following is the case of heat transfer by radiation?
A. Blast furnace
B. Heating of building
C. Cooling of parts in furnace
D. Blast furnace
27.Thermal conductivity of water _________ with rise in temperature.
A. Remain same
B. Decreases
C. Increases
D. Remain same
28.Heat is closely related with
A. Liquids
B. Energy
C. Temperature
D. Liquids
29.The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is
A. Equal to one
B. Greater than one
C. Less than one
D. Equal to one
30.Pick up the wrong case. Heat flowing from one side to other depends directly on
A. Face area
B. Time
C. Thickness
D. Face area
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