Keeping the heat transfer surface clean
Enhancing the fluid pumping rate
Increasing the tube length
None of these
✅ The correct answer is option A.
Engineering
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1652. With increase in temperature, the thermal conductivity of most liquids
Increases
Decreases
Remains same
First increases upto a certain temperature and then becomes constant
✅ The correct answer is option B.
1653. A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires
Less heating surface
More space
Lower maintenance cost
None of these
✅ The correct answer is option B.
1654. Heat flux through several resistances in series in analogous to the current flowing through several
Resistances in parallel
Capacitors in series
Resistances in series
None of these
✅ The correct answer is option C.
1655. A body is called grey if the monochromatic emissivity of the body is
Zero
Unity
Same for all wavelengths
Different for all wavelengths
✅ The correct answer is option C.
1656. The equation, (NSt x N2/3Pr) = f/2, is the __________ analogy.
Colburn
Reynolds
Prandtl
None of these
✅ The correct answer is option A.
1657. For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then
hf = hd
hf > hd
hf < hd
hf could be greater or smaller than hd
✅ The correct answer is option C.
1658. An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a
Boiler
Heat exchanger
Recuperator
Regenerator
✅ The correct answer is option B.
1659. Thermal conductivity of a gas at low density, __________ with increase in temperature.
Decreases
Increases
Remains unchanged
May increase or decrease; depends on the gas
✅ The correct answer is option B.
1660. The equation, Nst = f/2, is the __________ analogy.
Colburn
Reynolds
Prandtl
None of these
✅ The correct answer is option B.