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Home » Engineering » Aptitude Test - 72
Hassan
1.Heat transfer deals with the rate of
A. work transfer
B. temperature transfer
C. energy transfer
D. work transfer
2. If the body or element does not produce heat, then the general heat conduction equation which gives the temperature distribution and conduction heat flow in an isotropic solid reduces to(∂T/∂x2)
A. Laplace equation
B. Fourier equation
C. Poisson equation
D. Laplace equation
3. Heat transfer by conduction is directly proportional to
A. (thermal potential difference)/(thermal resistance)
B. (thermal resistance)/(thermal potential difference)
C. (thermal potential difference)(thermal resistance)
D. (thermal potential difference)/(thermal resistance)
4.Whenever there is a temperature difference
A. heat will be transferred from hotter object to colder object
B. heat will be transferred from colder object to hotter object
C. heat will not be transferred
D. heat will be transferred from hotter object to colder object
5. The units of thermal conductivity in SI unit are
A. W/(m.K)
B. J/(m.K)
C. W/(m2.K)
D. W/(m.K)
6.The thermal conductivity of a gas
A. decreases with increasing temperature
B. increases with increasing temperature
C. is independent of temperature and pressure
D. decreases with increasing temperature
7. 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
8.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
9. Thermal conductivity is maximum for
A. coke
B. gasoline
C. steel
D. coke
10.Thermal conductivity is minimum for
A. asphalt
B. water
C. petroleum coke
D. asphalt
11. 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
12. 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
13. 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
14.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
15.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
16.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
17. The thermal conductivity of a perfect heat insulator is
A. zero
B. infinity
C. one
D. zero
18.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
19.The conductance has the units of
A. W/m2
B. W/K
C. W/(m.K0
D. W/m2
20.The thermal diffusivity of a material is defined as
A. k/(pCp)
B. (pCp)/k
C. (kCp)/p
D. k/(pCp)
21. The units of the thermal diffusivity of a material are
A. m2/K
B. s/m2
C. W/(m2.K)
D. m2/K
22.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
23. 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
24. Modes of Heat Transfer
A. Heat
B. Energy
C. work
D. Heat
25.Heat is measured in:
A. Joule
B. Calorie
C. both A and B
D. Joule
26.1 cal. = ?
A. 1.2 joule
B. 3.2 joule
C. 4.2 joule
D. 1.2 joule
27. The form of energy that produces a feeling of hotness is called as:
A. work
B. Heat
C. Energy
D. work
28.With the increase in temperature, heat will be:
A. increase
B. constant
C. decrease
D. increase
29.How we measure the energy value of food?
A. Joule
B. Joule/second
C. Calorie
D. Joule
30. 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
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