Related Questions

The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is __________ compared to the same size pipes without fins.
A More
B Less
C Same
D Unpredictable
In a class of 60 students, 20 students like Math, 25 students like English and 30 students like Science. If 5 Students like both Math and Science, 8 Students like both English and Science and 3 students like neither of these subjects, how many students like all of the three subjects?
A 2
B 3
C 4
D 5
The main purpose of providing fins on heat transfer surface is to increase the
A Temperature gradient
B Mechanical strength of the equipment
C Heat transfer area
D Heat transfer co-efficient
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in
A Air
B Oxygen
C Either A or B
D Either A or C without gain or loss of heat
In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.
A Film
B Nucleate
C Transition
D All of the above
In which of the following cases provision of fins on a given heat transfer surface will be more effective?
A Fewer but thin fins
B Large number of thin fins
C Large number of thick fins
D Fewer but thick fins
Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
A Film
B Nucleate
C Transition
D All of the above
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
A Remain same
B Decrease
C Increase
D None of the above
If a heat transfer surface is pock-marked with a number of cavities, then as compared to a smooth surface the heat transfer by __________ will not increase.
A Convection
B Nucleate boiling
C Radiation
D Conduction
Out of 30 student o any class, 20 students like football and 15 students like cricket . The number of students who like both the games is 10. Find the number of students who do not like any of the sports.
A 4
B 5
C 6
D 8

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