. . . SHELL AND TUBE HEAT EXCHANGER . . 1 What are the heat transfer mechanisms involved during heat transfer from the hot fluid to the cold fluid? Conduction  Convection  Radiation  All of the above  2 In a shell and tube heat exchanger which of the following statements is true Heat transferred to the cold fluid is more than the heat transferred from the hot fluid.  Heat transferred to the cold fluid is less than the heat transferred from the hot fluid.  Heat transferred to the cold fluid is equal to the heat transferred from the hot fluid.  None of above   3 Which of the following is the correct expression of heat absorbed by the cold fluid? Q={m.Cp.(Tf-Ti)}2  Q=m.Cp.(Tf-Ti)  Q=m.Cp.(Tf-Ti)2  None of the above  4 Which of the following is the correct expression of heat transfer from hot fluid to the cold fluid? Q=U.A.LMTD  Q=LMTD/UA  Q=U.A2.LMTD  None of these  5 The dimension of heat transfer co-efficient is:- Watt / Meter2/ Kelvin   Watt /meter/Kelvin  Kelvin/meter/Watt  None of these  6 The dimension of LMTD is same as that of: Temperature/Temperature  Temperature  Temperature2  dimensionless  7 In a shell and tube heat exchanger the flow rate of shell side liquid inlet at steady state is? more than the shell side liquid outlet  less than the shell side liquid outlet  equal to the shell side liquid outlet.  It can be any of these  8 In the above question the correct reason for the right answer is? Law of conservation of Energy  Law of conservation of Mass  Newton’s 1st law of motion  A known phenomenon  9 In a shell and tube heat exchanger the diameter of shell is? larger than tube  smaller than tube  equal to tube  It may be any of these  10 What do you mean by steady state in this experiment? The Temperature of both shell and tube are not varying along the length  The Temperature of both shell and tube are not varying with time.  Both  None of the above options  11 The hot fluid must be necessarily passed through? the shell  the tube  Any of these  None of the above options is correct  12 The baffles are used on which side of the heat exchanger? Shell Side  Tube Side  Both  It can be any one shell side or tube side  13 The main purpose of using baffles in heat exchanger is? To decrease the flow rate in shell  To increase the heat transfer coefficient (U)  To increase the LMTD value  To decrease the LMTD value.  14 Which of the following represents the correct expression for calculating LMTD? LMTD= (ΔT2- ΔT1)/log(ΔT2/ ΔT1)  LMTD= log(ΔT2/ ΔT1)/ (ΔT2- ΔT1)  LMTD=log((ΔT2- ΔT1)/ (ΔT2/ vT1))  LMTD=log((ΔT2- ΔT1)/ (ΔT2/ ΔT1))-1  15 On one side of a heat exchanger, air enters at 72.82ºC and leaves at 90ºC. On the other side of the heat exchanger is condensing steam at one atmosphere.The value for LMTD is 10 K   17.18 K   27ºC  100ºC  16 Shell and Tube heat exchanger is which type of heat exchanger? Direct Contact  Indirect Contact  Both  None  17 Which of the following does not belong to the category of heat exchanger? Automobile radiators  Refrigerators  Stove’s used in households  None of the above  18 Which of the following does not belong to the category of flows in a heat exchanger? Cross Flow  Co Current  Counter Current  Over Flow  19 The following are the types of indirect contact heat exchangers? Regenerators  Recuperators  Both  None  20 In which of the following types of heat exchangers the hot and cold fluids pass alternately through a space containing solid particles providing a source and a sink for heat exchange? Regenerators  Recuperators  Both  None  21 Automobile Radiators belong to which of the following category? Direct Contact Heat exchanger  Regenerator  Recuperator  All of above  22 What will happen if the flow rate of shell side liquid is made very high? more heat transfer will take place  less heat transfer will take place  heat transfer will not depend on the flow rate  none of the above  23 Which of the following expressions represents the Heat energy balance which is used to derive the variation of temperature of both tube and shell with time and distance along the heat exchanger? Inlet = outlet + Accumulation  Outlet = Inlet +Accumulation  Inlet + outlet + Accumulation =0  None of these  24 The differential equation governing the temperature of shell and tube is of order m in time(t) and of order n with respect to length along the heat exchanger(x), where – m=1, n=2  m=2, n=1  m=1, n=1  m=2, n=2  25 Which of the following parameters has no effect on the temperature profiles of shell and tube liquid? The diameter of the tube  The diameter of the shell  The density of the shell fluid  The density of the tube fluid  26 In figure-1, the variation of temperature of both hot and cold fluids along the length of the heat exchanger is given. The graph represents - Co-Current flow  Counter Current flow  Cross Current Flow  None of these  27 In figure-2, the variation of temperature of both hot and cold fluids along the length of the heat exchanger is given. The graph represents – Co-Current flow  Counter Current flow  Cross Current Flow  None of these  28 In figure -1 and figure-2, assuming that the temperature of shell and tube side liquids at both the ends of a heat exchanger is same, then which of the options is correct? LMTD in case of figure -1 is higher than in figure-2  LMTD in case of figure -2 is higher than in figure-1  LMTD in case of figure -1 is equal to that in figure-2   Cannot Say  29 The correct variation of Area(A) required for heat transfer versus the LMTD value is? Aα LMTD  A α LMTD2  A α 1/ LMTD  A is independent of LMTD  30 In figure -1 and figure-2, assuming that the temperature of shell and tube side liquids at both the ends of a heat exchanger is same, then which of the options is correct? Area required in case of figure -1 is higher than in figure-2  Area required in case of figure -2 is higher than in figure-1.  Area required in case of figure -1 is equal to that in figure-2.   Cannot Say  31 If the length of the heat exchanger is infinitely large then which of the following options is most appropriate? The temperature of cold fluid will exceed the temperature of hot fluid.  The hot and cold lines in the above graphs will cross each other at least once.  The temperature of the hot and cold fluids will become constant after a certain distance along the length of the heat exchanger.  None of above options.  32 For the heat exchange between hot and cold fluid, which of the following options is correct? The flow rate of tube side should be higher than shell side  The flow rate of tube side should be lesser than shell side  The flow rate of tube side should be equal to that of the shell side  It doesn’t matter which flow rate is higher.  33 Time Constant is the time when a% of the final value is achieved, where a is? 33.3%  63.2%  99%  100%  34 As soon as the user makes a perturbation in the tube side inlet temperature- The tube side outlet will immediately change from it’s steady state value  It will take some time to change from it’s previous value  It will not change at all  None of these  35 The main reason for the above question’s answer is: The thermometer will take some time to respond to the perturbation.  the tube inlet fluid will take some time to reach the other end.  both of the above  None of the above options  36 Baffle spacing Should be less than one fifth diameter of shell.  Should be less than inside diameter of shell  Should be less than one fifth diameter of tube  None of these  37 Correction is applied to LMTD for …………… flow Parallel  Cross  Counter  None of these  38 A 2-4 heat exchanger involves Only counter flow of fluids  Only parallel flow of fluids  Both counter and parallel flow of fluids.  None of these.  39 Double pipe heat exchanger are preferably useful, when A non corrosive liquid is to be heated  A high viscous liquid is to be heated  Requirement of heat transfer area is low  Overall heat transfer is low  40 Fouling factor Is a dimensionless quantity.  Accounts for additional resistance to heat flow  Does not provide a safety factor for design  None of these.  Cite this Simulator:iitkgp.vlab.co.in,. (2012). SHELL AND TUBE HEAT EXCHANGER. Retrieved 20 November 2017, from iitkgp.vlab.co.in/index.php?sub=35&brch=107&sim=1174&cnt=5 ..... ..... .....