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MCQs 1: How does the radiation heat transfer occur through perfect vacuum?

by light waves by electromagnetic waves both a. and b. none of the above
Answer Explanation

MCQs 2: The Stefan-Boltzmann law of thermal radiation is applicable for

white body gray body black body all of the above
Answer Explanation

MCQs 3: According to the Stefan-Boltzmann law of thermal radiation for a perfect radiator, the rate of radiant energy per unit area is proportional to

the temperature of that radiator the square of the temperature of that radiator the cube of the temperature of that radiator the fourth power of the temperature of that radiator
Answer Explanation

MCQs 4: Which of the following fluid can be considered as an ideal fluid?

viscous fluid non-viscous fluid compressible fluid all of the above
Answer Explanation

MCQs 5: The viscosity of a liquid

increases with increase in liquid temperature decreases with increase in liquid temperature is not affected by the change in liquid temperature is unpredictable
Answer Explanation

MCQs 6: How is the viscosity of gas affected by change in its temperature?

viscosity of a gas decreases with increase in temperature of gas viscosity of a gas increases with increase in temperature of gas viscosity of a gas is not affected by change in temperature of gas viscosity of a gas is unpredictable
Answer Explanation

MCQs 7: What is kinematics viscosity of a fluid?

dynamic viscosity per unit volume of the fluid dynamic viscosity per unit weight of the fluid dynamic viscosity per unit density of the fluid none of the above
Answer Explanation

MCQs 8: The heat transfer is largely governed by conduction from the surface of the fluid, when

the velocity of the fluid is high the velocity of the fluid is small the velocity of the fluid is small as well as high none of the above
Answer Explanation

MCQs 9: Generally, thermal conductivity of liquids is

very high very small varies from very small to very high unpredictable
Answer Explanation

MCQs 10: The emissive power of a body depends upon

temperature of the body characteristics of the surface of the body both a. and b. none of the above
Answer Explanation

MCQs 11: At a given temperature if wavelengths are changed, the quality of radiation per unit wavelength

will always be constant will also be changed will be changed sometimes but sometimes be constant unpredictable
Answer Explanation

MCQs 12: What is the relation between temperature of a body and the wavelength of its emitted radiation at its maximum emissive power?

as temperature of a body increases the wavelength of its emitted radiation also increases at its maximum emissive power as temperature of a body increases the wavelength of its emitted radiation decreases at its maximum emissive power as temperature of a body increases the wavelength of its emitted radiation does not change only at its maximum emissive power none of the above
Answer Explanation

MCQs 13: Which of the following relation is correct for the radiation?

[Incident Radiation] + [Absorbed Radiation] = [Reflected Radiation] + [Transmitted Radiation] [Incident Radiation] + [Transmitted Radiation] = [Reflected Radiation] + [Absorbed Radiation] [Incident Radiation] = [Reflected Radiation] + [Absorbed Radiation] + [Transmitted Radiation] [Absorbed Radiation] = [Reflected Radiation] + [Transmitted Radiation] + [Incident Radiation]
Answer Explanation

MCQs 14: What is the relation between reflectivity (ρ), absorptivity (α) and transmissivity (τ)?

ρ – α + τ = 1 ρ + α – τ = 1 ρ + α + τ = 1 ρ – α – τ = 1
Answer Explanation

MCQs 15: What is the opaque body?

the body which does not reflect radiation the body which does not absorb radiation the body which does not transmit radiation all of the above
Answer Explanation

MCQs 16: What is diffuse reflection of radiation?

the reflection of radiation on a rough surface which occurs in all directions the reflection of radiation on a rough surface which occurs in a single direction the reflection of radiation on a smooth surface none of the above
Answer Explanation

MCQs 17: The reflection in which the angle of incident is equal to the angle of reflection is called as

regular reflection specular reflection both a. and b. none of the above
Answer Explanation

MCQs 18: The values of reflectivity (ρ), absorptivity (α) and transmissivity (τ) of a body are depend upon

material of the body surface condition of the body wavelength of radiation all of the above
Answer Explanation

MCQs 19: Generally, the convection heat transfer coefficient in drop-wise condensation is

lower than the convection heat transfer coefficient in film condensation higher than the convection heat transfer coefficient in film condensation equal to the convection heat transfer coefficient in film condensation unpredictable
Answer Explanation

MCQs 20: Surface coating is suitable to maintain

drop-wise condensation film condensation both drop-wise and film condensation none of the above
Answer Explanation

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