Maximum heat transfer rate can be expected in case of_________?
Maximum heat transfer rate can be expected in case of_________?A. Laminar flow B. Co-current flow C. Turbulent flow D. Heat flow rate is independent of nature of flow
Chemical Heat Transfer
Baffles are provided in heat exchangers to____________?
Baffles are provided in heat exchangers to____________?A. Remove dirt B. Increase heat transfer rate C. Reduce vibrations D. Reduce heat transfer rate
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________? A. Higher economy B. Lower capacity C. Both A. & B. D. Lower economy
For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?
For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________? A. ForwardB. Backward C. Parallel D. None of these
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be__________________?
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient…
Heat waves_____________________?
Heat waves_____________________? A. Cannot pass through vacuum B. Travel in straight line C. Can be reflected by a mirrorD. Both B. and C.
If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?
If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor? A. IncreaseB. Decrease C. Not affect D. Increase the condensing film co-efficient as well as
For a perfectly transparent surface (like gases), the____________________?
For a perfectly transparent surface (like gases), the____________________? A. Absorptivity = 0B. Transmissivity = 1 C. Reflectivity = 0 D. All A., B. & C.
A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________?
A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________? A. d0.8B. d-0.2 C.…
Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?
Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________? A. 4000D. > 10000