1. | Which field is set up when a fluid flows past a heated or cold surface? |
a. | Energy |
b. | Temperature |
c. | Mass |
d. | Time |
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Answer: (b).Temperature
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2. | The zone or thin layer wherein the temperature field exists is called the |
a. | Single boundary layer |
b. | Multi boundary layer |
c. | Hydrodynamic boundary layer |
d. | Thermal boundary layer |
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Answer: (d).Thermal boundary layer
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3. | The thickness of thermal boundary layer is arbitrarily defined as the distance from the plate surface at which |
a. | t S – t/t S – t INFINITY = 0.34 |
b. | t S – t/t S – t INFINITY = 0.10 |
c. | t S – t/t S – t INFINITY = 0.99 |
d. | t S – t/t S – t INFINITY = 0.87 |
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Answer: (c).t S – t/t S – t INFINITY = 0.99
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4. | The convection of energy reduces the outward conduction in the fluid so temperature gradient |
a. | Decreases |
b. | Increases |
c. | Constant |
d. | Becomes twice |
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Answer: (a).Decreases
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5. | The velocity profile of the hydrodynamic boundary layer is dependent upon |
a. | Time |
b. | Viscosity |
c. | Temperature |
d. | Mass |
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Answer: (b).Viscosity
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