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MCQs

Total Questions : 448 | Page 6 of 45 pages
Question 51. The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as
  1.    Thermal coefficient
  2.    Thermal resistance
  3.    Thermal conductivity
  4.    None of these
 Discuss Question
Answer: Option B. -> Thermal resistance
Question 52. Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)
  1.    P = 0, x = 0 and a = 1
  2.    P=1, T = 0 and a = 0
  3.    P = 0, x = 1 and a = 0
  4.    X = 0, a + p = 1
 Discuss Question
Answer: Option B. -> P=1, T = 0 and a = 0
Question 53. Depending on the radiating properties, body will be transparent when (Where a = absorptivity, p = reflectivity, x = transmissivity)
  1.    P = 0, x = 0 and a = 1
  2.    P=1, x = 0, and a = 0
  3.    P = 0, x= 1, and a = 0
  4.    X = 0, a + p = 1
 Discuss Question
Answer: Option C. -> P = 0, x= 1, and a = 0
Question 54. 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
Question 55. In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by
  1.    Hr (time)
  2.    Sq. m (area)
  3.    °C (temperature)
  4.    K.cal (heat)
 Discuss Question
Answer: Option D. -> K.cal (heat)
Question 56. The time constant of a thermocouple is
  1.    The time taken to attain the final temperature to be measured
  2.    The time taken to attain 50% of the value of initial temperature difference
  3.    The time taken to attain 63.2% of the value of initial temperature difference
  4.    Determined by the time taken to reach 100°C from 0°C
 Discuss Question
Answer: Option C. -> The time taken to attain 63.2% of the value of initial temperature difference
Question 57. The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit
  1.    Temperature
  2.    Thickness
  3.    Area
  4.    Time
 Discuss Question
Answer: Option D. -> Time
Question 58. Thermal diffusivity is
  1.    A dimensionless parameter
  2.    Function of temperature
  3.    Used as mathematical model
  4.    A physical property of the material
 Discuss Question
Answer: Option D. -> A physical property of the material
Question 59. Heat transfer takes place as per
  1.    Zeroth law of thermodynamics
  2.    First law of thermodynamic
  3.    Second law of the thermodynamics
  4.    Kirchoff's law
 Discuss Question
Answer: Option C. -> Second law of the thermodynamics
Question 60. Unit of thermal diffusivity is
  1.    m²/hr
  2.    m²/hr °C
  3.    kcal/m² hr
  4.    kcal/m. hr °C
 Discuss Question
Answer: Option A. -> m²/hr

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