## Lakshya Education MCQs

Question: In counter flow heat exchangers
Options:
 A. Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state B. Both the fluids at inlet are in their hottest state C. Both the fluids at exit are in their hottest state D. One fluid is in hottest state and other in coldest state at inlet
Explanation :

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## More Questions on This Topic :

Question 1. The energy distribution of an ideal reflector at higher temperatures is largely in the range of
1.     Shorter wavelength
2.     Longer wavelength
3.     Remain same at all wavelengths
4.     Wavelength has nothing to do with it
Explanation :
Question 2. Fourier's law of heat conduction is (where q = amount of heat flow through the body in unit time, a = surface area of heat flow, taken at right angles to the direction of heat flow, dt = temperature difference on the two faces of the body, dx = thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = thermal conductivity of the body)
1.     k. A. (dT/dx)
2.     k. A. (dx/dT)
3.     k. (dT/dx)
4.     k. (dx/dT)
Explanation :
Question 3. In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.
1.     Same
2.     Less
3.     Greater
4.     None of these
Explanation :
Question 4. Upto the critical radius of insulation,
1.     Added insulation will increase heat loss
2.     Added insulation will decrease heat loss
3.     Convective heat loss will be less than conductive heat loss
4.     Heat flux will decrease
Explanation :
Question 5. Fourier's law of heat conduction is (where q = amount of heat flow through the body in unit time, a = surface area of heat flow, taken at right angles to the direction of heat flow, dt = temperature difference on the two faces of the body, dx = thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = thermal conductivity of the body)
1.     k. A. (dT/dx)
2.     k. A. (dx/dT)
3.     k. (dT/dx)
4.     k. (dx/dT)