Related Questions

In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
A Are easier to clean
B Are less prone to fouling
C Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
D None of these
When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in metres permitted in this null-modem connection?
A 80
B 100
C 30
D 150
E None of the above
Which of the following is not a removable disk?
A Floppy disk
B Compact disk
C DVD
D USB mobile disk
Which of the items below are considered removable storage media ?
A Removable hard disk cartridges
B (Magneto-optical) disk
C Flexible disks cartridges
D All of them
In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.
A Less than
B 1.25-1.50 times
C 2.5 times
D One-fourth of
For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.
A More
B Less
C Equal
D None of these
Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.
A 1.25
B 1.75
C 2.5
D 3.5
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has
A More heating surface
B Less heating surface
C Equal heating surface
D Heating surface depends on other parameters
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
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

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