Q.1
Which of the following is not a classification based on Construction of the heat Exchanger?
  • a) Multipass
  • b) Regenerative
  • c) Plate Type
  • d) Tubular
Q.2
Packed Beds are one of the most common heat exchangers because of its very ______
  • a) Low heat transfer rate
  • b) High bed side heat transfer coefficient
  • c) High conductivity
  • d) High wall side heat transfer coefficient
Q.3
What is Critical radius of insulation?
  • a) The minimum radius at which maximum heat transfer rate is observed
  • b) The maximum radius that can allow heat transfer
  • c) The maximum heat transfer coefficient at a maximum possible radius
  • d) The radius at which maximum heat transfer rate is observed
Q.4
In a ___________ heat exchanger, both fluids flow alternatively through the same flow passages, and hence heat transfer is intermittent.
  • a) Cross Flow Type
  • b) Fluidised Bed
  • c) Shell and Tube
  • d) Storage Type
Q.5
When gas is used as a fluid in a double pipe heat exchanger, which one of the following is not true?
  • a) Fins increase necessary heat transfer area
  • b) The gas side heat transfer coefficient is the highest
  • c) Extended fins are used on the gas side to increase the Heat Transfer coefficient
  • d) The gas side has a low heat transfer coefficient
Q.6
Which of the following is not a characteristic of a Direct-Contact Exchanger?
  • a) The Exchanger Construction is relatively not expensive
  • b) The fouling problem does not generally exist, due to the absence of a separating wall (heat transfer surface
  • c) Only heat Transfer occurs without any Mass -Transfer
  • d) Very high heat transfer rates are achievable
Q.7
Given the convective heat transfer Coefficient of the inner surface to be 15W/m2K, OD = 30mm and ID = 25mm. Find the outer surface heat transfer coefficient.
  • a) 12.5 W/m2K
  • b) 15 W/m2K
  • c) 13.5 W/m2K
  • d) 12 W/m2K
Q.8
To calculate the efficiency of a double pipe heat exchanger, the formula is
  • a) Minimum rate of heat transfer
  • b) Experimental rate of heat transfer
  • c) Clean tube rate of heat transfer
  • d) Actual rate of heat transfer
Q.9
Why do we use counter-flow operation on gasketed type Heat Exchanger?
  • a) It reduces corrosion
  • b) Applied pressure difference required is low
  • c) It provides better ease of operation
  • d) A larger and uniform temperature difference is achieved
Q.10
Which of the following is not a property of Plate type heat exchangers?
  • a) Even though the heat exchanger has low hydraulic diameter, it can be readily and easily cleaned
  • b) The net weight required is always less than its equivalent Shell and tube type heat exchanger
  • c) It provides a very large surface area for heat transfer
  • d) Leakage is never a concern in these heat exchangers
Q.11
Which of the following is a correct statement about Plate -Fin heat exchanger?
  • a) It can be regarded as a Compact Heat Exchanger as it has a high heat transfer surface to volume ratio
  • b) The cost of plate-fin HE are relatively less compared to other conventional HE available in market
  • c) Even though it has fins, the plates can be opened and easily cleaned
  • d) Fins are irrelevant as it already provides a very large surface area
Q.12
How is a Plate-type HE better than a Shell and tube HE, one of the following is not correct.
  • a) Thermal stress is higher in Plate type HE
  • b) Plate type heat exchangers have much higher heat transfer area than Shell and tube ones
  • c) Entry impingement problem of shell and tube is absent in Plate type HE
  • d) Vibrations due to flow and noise are comparatively absent in Plate type HE
Q.13
What limitations does Gaskets pose on Gasketed type HE?
  • a) It leads to leakage and does not provide proper separation
  • b) Reduces necessary heat transfer area causing decreased Heat coefficients
  • c) One directional flow is the only possibility
  • d) Limits its use only to non-corrosive fluids, as the gaskets get corroded
Q.14
Which is the major mean of heat transfer in a Double Pipe heat exchanger?
  • a) Combined Convection and Conduction
  • b) Radiation
  • c) Convection
  • d) Conduction
Q.15
How many times do we have to calculate for Nusselt number in a Double Pipe Heat Exchanger?
  • a) 6
  • b) 2
  • c) 4
  • d) 9
Q.16
When a fluid is used in a Shell and Tube heat exchanger, which one of the following is not true?
  • a) Fins increase necessary heat transfer area
  • b) If the fluid is gas then the gas side heat transfer coefficient is the lowest
  • c) Extended fins are used on the shell side to increase the Heat Transfer coefficient
  • d) Baffles are provided only to work as fins
Q.17
Fins primarily increase the ______
  • a) Heat transfer rate
  • b) Turbulence
  • c) Heat transfer coefficient
  • d) Heat transfer area
Q.18
Which of the following are not affected by adding Fins?
  • a) Turbulence
  • b) Heat transfer coefficient
  • c) Net Heat Transfer
  • d) Heat transfer rate
Q.19
Fouling factors increase the overall heat transfer conductance and hence decrease the overall heat transfer coefficient.
  • a) False
  • b) True
Q.20
Which of the following statements are not true about fouling in a Heat Exchanger?
  • a) Pressure drop decreases
  • b) Efficiency decreases
  • c) It decreases the heat transfer coefficient in both sides
  • d) Temperature of the hot fluid remains hot and the cold fluid remains cold
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