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Home » Engineering » Chemical Engineering » Aptitude Test - 18
1.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
2. 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
3.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
4. Unit of thermal diffusivity is
A. m²/hr
B. m²/hr °C
C. kcal/m² hr
D. m²/hr
5. 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
6.Thermal conductivity of wood depends on
A. Moisture
B. Density
C. Temperature
D. Moisture
7.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
8.The unit of overall coefficient of heat transfer is
A. W/m²K
B. W/m²
C. W/mK
D. W/m²K
9.LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is
A. Higher
B. Lower
C. Same
D. Higher
10. The transfer of heat by molecular collision is smallest in
A. Solids
B. Liquids
C. Gases
D. Solids
11.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
12. 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
13.An ordinary passenger aircraft requires a cooling system of capacity.
A. 2 TR
B. 4 TR
C. 8 TR
D. 2 TR
14.Joule sec is the unit of
A. Universal gas constant
B. Kinematic viscosity
C. Thermal conductivity
D. Universal gas constant
15.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
16.The value of Prandtl number for air is about
A. 0.1
B. 0.3
C. 0.7
D. 0.1
17.The product of Reynolds number and Prandtl number is known as
A. Stanton number
B. Biot number
C. Peclet number
D. Stanton number
18.Heat transfer in liquid and gases takes place by
A. Conduction
B. Convection
C. Radiation
D. Conduction
19.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
20.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
21.Thermal conductivity of water _________ with rise in temperature.
A. Remain same
B. Decreases
C. Increases
D. Remain same
22.Heat is closely related with
A. Liquids
B. Energy
C. Temperature
D. Liquids
23.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
24.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
25.The critical radius is the insulation radius at which the resistance to heat flow is
A. Maximum
B. Minimum
C. Zero
D. Maximum
26. Free surface of a liquid tends to contract to the smallest possible area due to force of
A. Surface tension
B. Viscosity
C. Friction
D. Surface tension
27.The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.
A. The bodies A and B have equal stability
B. The body A is more stable than body B
C. The body B is more stable than body A
D. The bodies A and B have equal stability
28.The rise or depression of liquid in a tube due to surface tension will increase in size of tube will
A. Increase
B. Remain unaffected
C. May increase or decrease depending on the characteristics of liquid
D. Increase
29.A body floats in stable equilibrium
A. When its meatcentric height is zero
B. When the metacentre is above e.g.
C. When its e.g. is below its center of buoyancy
D. When its meatcentric height is zero
30.The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from
A. wA
B. wx
C. wAx
D. wA
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