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1000 Heat Transfer Operations
Quiz 1
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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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