280) The specific humidity during humidification process

remains constant

increases

decreases

none of these

Answer is:

increases

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281) Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

(S.H.)/(S.H.+L.H.)

(S.H.+L.H)/(S.H.)

(S.H.-L.H)/(S.H.)

(S.H.)/(S.H.-L.H.)

Answer is:

(S.H.)/(S.H.+L.H.)

282) Stefan-Boltzmann law is applicable for heat transfer by convection.

Agree

Disagree

Answer is:

Disagree

Explanation:

According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature. Stefan Boltzmann law is applicable for heat transfer by radiation. The unit of Stefan-Boltzman is Watt/m²K⁴.

283) The most commonly used method for the design of duct size is the

velocity reduction method

equal friction method

static regain method

dual or double method

Answer is:

static regain method

284) In counter-current flow heat exchangers

both the fluids at inlet are in their hottest state

both the fluids at inlet are in their coldest state

both the fluids at exit are in their hottest state

one fluid is coldest and the other is hottest at inlet

Answer is:

both the fluids at inlet are in their hottest state

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