Lakshya Education MCQs

Question: In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.
Answer: Option B

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Question 1. Pick out the correct statement.
  1.    Higher is the temperature of the radiating body, higher is the wavelength of radiation
  2.    Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder
  3.    The wavelength corresponding to maximum mono-chromatic emissive power increases with rise in temperature
  4.    Solid angle subtended by the finite surface at the radiating element is called the angle of incidence
Answer: Option B
Question 2. Steam traps are provided in steam carrying pipelines to
  1.    Condense steam
  2.    Release excess steam pressure by bleeding steam
  3.    Remove condensate and inert gases
  4.    None of these
Answer: Option C
Question 3. Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that
  1.    There is no internal heat generation
  2.    Boundary surfaces are isothermal
  3.    Material is anisotropic
  4.    Constant temperature gradient exists
Answer: Option C
Question 4. Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)
  1.    √d
  2.    d
  3.    d2
  4.    d1.5
Answer: Option C
Question 5. The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe )
  1.    K/h0
  2.    2K/h0
  3.    hi/K
  4.    2hi/K
Answer: Option A
Question 6. Overall heat transfer co-efficient for cooling of hydrocarbons by water is about
  1.    50 -100 Kcal/hr.m².°C
  2.    50 -100 W/m² . °K
  3.    50 -100 BTU/hr. ft.2°F
  4.    1000 - 1500 BTU/hr. ft.2°F
Answer: Option C

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