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MCQs 1: Which surface can be best described as a radiation shield?

the surface which has very high absorptivity the surface which has very high transmissivity the surface which has very high reflectivity none of the above
Answer Explanation

MCQs 2: Which object can be used as a radiation shield?

polished transparent glass mirror rubber all of the above
Answer Explanation

MCQs 3: Gases absorb and emit radiant energy

in all wavelengths over the entire spectrum (λ = 0 to ∞) only between narrow ranges of wavelengths only at single constant wavelength unpredictable
Answer Explanation

MCQs 4: Which among the following factors is/are taken into account in calculation of radiation emitted or absorbed by a gas layer?

thickness of the gas layer shape of the gas enclosure pressure in gas enclosure all of the above
Answer Explanation

MCQs 5: How is the incident radiation absorbed by a gas layer?

A gas layer absorbs incident radiation slowly A gas layer absorbs incident radiation rapidly doesn't matter unpredictable
Answer Explanation

MCQs 6: What are the compact heat exchangers?

the heat exchangers having small surface area per unit volume the heat exchangers having large surface area per unit volume the heat exchangers having small surface area per unit weight the heat exchangers having large surface area per unit weight
Answer Explanation

MCQs 7: Which of the following can be considered as more compact efficient heat exchanger?

Car radiators Stirling engine regenerator Ceramic regenerator in gas turbine none of the above
Answer Explanation

MCQs 8: The compact heat exchangers are commonly used in

gas to gas heat transfer gas to liquid heat transfer both a. and b. none of the above
Answer Explanation

MCQs 9: Usually, the flow arrangement of two fluids in compact heat exchangers is

parallel flow counter flow cross flow none of the above
Answer Explanation

MCQs 10: What is effectiveness of fin?

the ratio of actual heat transferred from fin area to the heat which would be transferred if entire fin area was at base temperature the heat which would be transferred if entire fin area was at base temperature to the ratio of actual heat transferred from fin area the heat which would be transferred if entire fin area was at minimum temperature to the ratio of actual heat transferred from fin area the ratio of actual heat transferred from fin area to the heat which would be transferred if entire fin area was at minimum temperature
Answer Explanation

MCQs 11: What is the effect of thermal conductivity k on fin effectiveness?

fin is effective for smaller value of thermal conductivity k fin is effective for larger value of thermal conductivity k thermal conductivity k does not affect the fin effectiveness cannot say
Answer Explanation

MCQs 12: What is the effect of convective heat transfer coefficient h on fin effectiveness?

fin is effective if the value of convective heat transfer coefficient h is small fin is effective if the value of convective heat transfer coefficient h is large fin effectiveness does not affected by the value of convective heat transfer coefficient h none of the above
Answer Explanation

MCQs 13: Which medium of surrounding is better for fin effectiveness?

gas medium liquid medium fins have same effectiveness in both the gas and liquid mediums none of the above
Answer Explanation

MCQs 14: For effective working of fins, the thickness of the fines should be

large small thickness of fin does not affect the fin effectiveness unpredictable
Answer Explanation

MCQs 15: Aluminum is used as a fin material because

it has higher convection heat transfer coefficient it has higher thermal conductivity it has lower convection heat transfer coefficient it has lower thermal conductivity
Answer Explanation

MCQs 16: Which of the following arrangements of fins is more effective for the same base area? 1. Large number of closely spaced fins 2. Small number of thick fins

Arrangement 1 Arrangement 2 both the arrangements 1 and 2 are similarly effective unpredictable
Answer Explanation

MCQs 17: Consider an element with finite dimensions. In general which among the following equations is correct for change in energy of element during a time span dt?

[Heat generated in the element during time dt] + [Heat flow into the element during time dt] + [Heat flow out of the element during time dt] [Heat generated in the element during time dt] + [Heat flow into the element during time dt] – [Heat flow out of the element during time dt] [Heat generated in the element during time dt] – [Heat flow into the element during time dt] – [Heat flow out of the element during time dt] none of the above
Answer Explanation

MCQs 18: When does the general heat conduction equation which gives the temperature distribution and conduction heat flow in an isotropic solid reduce to Laplace equation?

if the body or element is in unsteady-state with heat generation if the body or element is in steady-state with heat generation if the body or element is in unsteady-state with no heat generation if the body or element is in steady-state with no heat generation
Answer Explanation

MCQs 19: Generally the external thermal resistance between the surface of the body and the environment is

less than the internal conduction resistance in the body more than the internal conduction resistance in the body same as the internal conduction resistance in the body none of the above
Answer Explanation

MCQs 20: Suppose that a hot metal ball is immersed in cold water, then temperature distribution in the body depends upon

thermal conductivity of the body convective heat transfer from the body surface to water both a. and b. none of the above
Answer Explanation

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