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Home » Engineering » Chemical Engineering » Aptitude Test - 10
1. The thermal conductivity of water
A. remains unaffected with change in temperature
B. decreases with increase in temperature upto about 300?F
C. increases with increase in temperature upto about 300?F
D. remains unaffected with change in temperature
2.If ks kl and kg are the thermal conductivities of aluminium water and air at the same temperature then
A. ks > kl > kg
B. kg > kl > ks
C. ks > kg > kl
D. ks > kl > kg
3. Thermal conductivity is maximum for
A. coke
B. gasoline
C. steel
D. coke
4.Thermal conductivity is minimum for
A. asphalt
B. water
C. petroleum coke
D. asphalt
5. Heat transfer by conduction depends upon
A. temperature difference and thermal conductivity only
B. temperature difference and area only
C. temperature difference and thickness only
D. temperature difference and thermal conductivity only
6. Which one of the four factors would cause heat transfer rate by conduction to decrease if the value of that factor were increased?
A. temperature difference
B. thermal conductivity
C. area
D. temperature difference
7. A sphere a cube and a thin circular plate all made of the same material and having the same mass are initially heated to a temperature 300?C. Which of these objects will cool slowest when left in ai
A. sphere
B. cube
C. circular plate
D. sphere
8.The thermal conductivity of copper
A. remains unaffected with change in temperature
B. increases with increase in temperature
C. decreases with increase in temperature
D. remains unaffected with change in temperature
9.In general the thermal conductivity of a non-homogeneous material
A. decreases with increasing temperature
B. decreases with increasing apparent bulk density
C. increases both with increasing temperature and increasing apparent bulk density
D. decreases with increasing temperature
10.The thermal conductivity of engine oil (unused)
A. is greater than the thermal conductivity of water at the same temperature
B. remains unaffected with change in temperature
C. decreases with increase in temperature
D. is greater than the thermal conductivity of water at the same temperature
11. The thermal conductivity of a perfect heat insulator is
A. zero
B. infinity
C. one
D. zero
12.The conductance is
A. directly proportional to the resistance to heat flow
B. the reciprocal of the resistance to heat flow
C. directly proportional to the thermal potential difference
D. directly proportional to the resistance to heat flow
13.The conductance has the units of
A. W/m2
B. W/K
C. W/(m.K0
D. W/m2
14.The thermal diffusivity of a material is defined as
A. k/(pCp)
B. (pCp)/k
C. (kCp)/p
D. k/(pCp)
15. The units of the thermal diffusivity of a material are
A. m2/K
B. s/m2
C. W/(m2.K)
D. m2/K
16.The thermal diffusivity of a material is the ratio of
A. the thermal conductivity to the thermal capacity of the material
B. the thermal capacity to the thermal conductivity of the material
C. the thermal conductivity to the specific heat of the material
D. the thermal conductivity to the thermal capacity of the material
17. The thermal diffusivity of a material is important in the analysis of problems involving heat transfer by
A. radiation
B. natural convection
C. condensation
D. radiation
18. Modes of Heat Transfer
A. Heat
B. Energy
C. work
D. Heat
19.Heat is measured in:
A. Joule
B. Calorie
C. both A and B
D. Joule
20.1 cal. = ?
A. 1.2 joule
B. 3.2 joule
C. 4.2 joule
D. 1.2 joule
21. The form of energy that produces a feeling of hotness is called as:
A. work
B. Heat
C. Energy
D. work
22.With the increase in temperature, heat will be:
A. increase
B. constant
C. decrease
D. increase
23.How we measure the energy value of food?
A. Joule
B. Joule/second
C. Calorie
D. Joule
24. The amount of heat required to raise the temperature of a substance by 1°C is called:
A. work capacity
B. heat capacity
C. Energy capacity
D. work capacity
25.Heat capacity depends on
A. change in temperature
B. Mass of body
C. Nature of substance
D. change in temperature
26.Heat bring ……………… change
A. Physical
B. chemical
C. reversible
D. Physical
27.………………….. is neither created nor destroyed it can only change one form to another.
A. work
B. Heat
C. Energy
D. work
28.The amount of heat required to raise the temperature of a substance by …………..
A. 1°C
B. 1°F
C. 10°C
D. 1°C
29.The amount of heat required to raise the temperature of 1 kg by 1°C is called:
A. heat capacity
B. . work capacity
C. specific heat capacity
D. heat capacity
30.SI unit of specific heat capacity is:
A. kg°C
B. j/kg°C
C. j/kg°
D. kg°C
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