Related Questions

In standard taper roller bearings, the angle of taper of outer raceway is
A 5°
B 8°
C 15°
D 25°
The draft or taper allowance on casting is generally
A 1 to 2 mm/m
B 2 to 5 mm/m
C 5 to 10 mm/m
D 10 to 15 mm/m
The capacity of induced draft fan compared to forced draft fan in a boiler is
A Same
B More
C Less
D Less or more depending on size of boiler
The main advantage of forced draft over natural draft is that
A Combustion of fuel is complete
B Smaller height chimney can be used
C Furnace control is easier
D All of the above
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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