Related Mcqs:

1. Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is_____________?

   A. Vertical heat exchanger with steam on tube side
   B. Vertical heat exchanger with steam on shell side
   C. Horizontal heat exchanger with steam on tube side
   D. Horizontal heat exchanger with steam on shell side

2. In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass _____________ through the heat exchanger ?

   A. Once
   B. Twice
   C. Thrice
   D. Four times

3. For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

   A. Decreases the pressure drop
   B. Decreases the outlet temperature of cooling medium
   C. Increases the overall heat transfer coefficient
   D. None of these

4. The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by ______________ times, when the number of tube passes is increased to 8?

   A. 20.8
   B. 40.8
   C. 40.4
   D. 20.4

5. In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?

   A. Infinity
   B. Zero
   C. Same as average heat transfer co-efficient for tube side
   D. None of these

6. 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__________________?

   A. 15 min
   B. 22 min
   C. 44 min
   D. 51 min

7. Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2.°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the_________________?

   A. Higher condensing film co-efficient is desired
   B. Condensate is corrosive in nature
   C. Lower pressure drop through the exchanger is desired
   D. Temperature of the incoming vapor is very high

8. The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is_________________?

   A. Lower tube side pressure drop
   B. Lower shell side pressure drop
   C. Higher tube side heat transfer co-efficient
   D. Higher shell side heat transfer co-efficient

9. Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger ?

   A. Tube side pressure drop and the heat transfer rate
   B. Convective heat transfer co-efficient
   C. Effective tube surface area for convective heat transfer
   D. All A. B. and C.

10. A process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 – 1 shell and tube heat exchanger is available. The best arrangement is_______________?

    A. Counter flow with process stream on shell side
    B. Counter flow with process stream on tube side
    C. Parallel flow with process stream on shell side
    D. Parallel flow with process stream on tube side