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MCQs

Total Questions : 448 | Page 34 of 45 pages
Question 331. The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to
  1.    Stanton number
  2.    Grashoff number
  3.    Peclet number
  4.    Biot number
 Discuss Question
Answer: Option A. -> Stanton number
Question 332. The product of Reynolds number and Prandtl number is known as
  1.    Stanton number
  2.    Biot number
  3.    Grashoff number
  4.    Peclet number
 Discuss Question
Answer: Option D. -> Peclet number
Question 333. The energy distribution of an ideal reflector at higher temperatures is largely in the range of
  1.    Longer wavelength
  2.    Wavelength has nothing to do with it
  3.    Remain same at all wavelengths
  4.    Shorter wavelength
 Discuss Question
Answer: Option D. -> Shorter wavelength
Question 334. The unit of Stefan Boltzmann constant is
  1.    watt/cm4 °K
  2.    watt/cm2 °K⁴
  3.    watt/cm3 °K
  4.    watt2/cm °K⁴
 Discuss Question
Answer: Option B. -> watt/cm2 °K⁴
Question 335. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a
  1.    Grey body
  2.    White body
  3.    Black body
  4.    Opaque body
 Discuss Question
Answer: Option C. -> Black body
Question 336. In counter flow heat exchangers
  1.    Both the fluids at exit are in their hottest state
  2.    Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
  3.    Both the fluids at inlet are in their hottest state
  4.    One fluid is in hottest state and other in coldest state at inlet
 Discuss Question
Answer: Option C. -> Both the fluids at inlet are in their hottest state
Question 337. In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.
  1.    Less
  2.    Greater
  3.    Same
  4.    None of these
 Discuss Question
Answer: Option B. -> Greater
Question 338. Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)
  1.    P= 1, T = 0 and a = 0
  2.    P = 0, x = 0 and a = 1
  3.    X = 0, a + p = 0
  4.    P = 0, x = 1 and a = 0
 Discuss Question
Answer: Option B. -> P = 0, x = 0 and a = 1
Question 339. A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is
  1.    66.7°C
  2.    60°C
  3.    20°C
  4.    40°C
 Discuss Question
Answer: Option C. -> 20°C
Question 340. Depending on the radiating properties, body will be transparent when(Where a = absorptivity, p = reflectivity, x = transmissivity)
  1.    X = 0, a + p = 1
  2.    P = 0, x= 1, and a = 0
  3.    P = 0, x = 0 and a = 1
  4.    P=1, x = 0, and a = 0
 Discuss Question
Answer: Option B. -> P = 0, x= 1, and a = 0

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