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MCQs

Total Questions : 448 | Page 3 of 45 pages
Question 21. The expression q = ρ at4 is called
  1.     Fourier equation
  2.     Stefan-Boltzmann equation
  3.     Newton Reichmann equation
  4.     Joseph-Stefan equation
 Discuss Question
Answer: Option B. ->  Stefan-Boltzmann equation
Explanation :
Question 22. All radiations in a black body are
  1.    Reflected
  2.    Refracted
  3.    Transmitted
  4.    Absorbed
 Discuss Question
Answer: Option D. -> Absorbed
Question 23. The heat is transferred by conduction, convection and radiation in
  1.    Melting of ice
  2.    Boiler furnaces
  3.    Condensation of steam in condenser
  4.    None of these
 Discuss Question
Answer: Option B. -> Boiler furnaces
Question 24. Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
  1.    Electric heater
  2.    Steam condenser
  3.    Boiler
  4.    Refrigerator condenser coils
 Discuss Question
Answer: Option C. -> Boiler
Question 25. The radiation emitted by a black body is known as
  1.    Black radiation
  2.    Full radiation
  3.    Total radiation
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 26. The amount of heat flow through a body by conduction is
  1.    Directly proportional to the surface area of the body
  2.    Directly proportional to the temperature difference on the two faces of the body
  3.    Dependent upon the material of the body
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 27. The emissive power of a body depends upon its
  1.    Temperature
  2.    Wave length
  3.    Physical nature
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 28. The amount of radiation mainly depends upon the
  1.    Nature of the body
  2.    Temperature of the body
  3.    Type of surface of the body
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 29. Film coefficient is defined as Inside diameter of tube
  1.    Equivalent thickness of film
  2.    Thermal conductivity Equivalent thickness of film Specific heat × Viscosity
  3.    Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity
  4.    Film coefficient × Inside diameter Thermal conductivity
 Discuss Question
Answer: Option B. -> Thermal conductivity Equivalent thickness of film Specific heat × Viscosity
Question 30. Thermal diffusivity is a
  1.    Function of temperature
  2.    Physical property of a substance
  3.    Dimensionless parameter
  4.    All of these
 Discuss Question
Answer: Option B. -> Physical property of a substance

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