Related Questions

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of
A 1
B 1.74
C 6.1
D 37
The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a
A Weir
B Pitot tube
C Kennison nozzle
D V-notch
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is
A More
B Less
C Some
D Either more or less ; depends on the nature of vapor
If h₁ = inner film co-efficient and /h₂ = outer film co-efficient, then the overall heat transfer co-efficient is
A Always less than h₁
B Always between h₁ and h₂
C Always higher than h₂
D Dependent on metal resistance
Which of the following fluid flow measuring devices can measure the largest flow rate?
A V-notch
B Rotameter
C Orificemeter
D Weir
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
A $$\frac{{\text{Q}}}{2}$$
B $$\frac{{\text{Q}}}{4}$$
C $$\frac{{\text{Q}}}{8}$$
D $$\frac{{\text{Q}}}{{16}}$$
Which of the following are used for accurately measuring very small time intervals ?
A Pulsars
B Quartz clocks
C Atomic clocks
D White dwarfs
Which one of the following is most likely used for measuring the rate of electron flow?
A Voltmeter
B Ammeter
C Wattmeter
D Ohmmeter
E None of the above
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
A Vacuum
B Sand
C Plate & frame
D Rotary
A man wishes to cover his floor with tiles, each one measuring 3/4 inch by 2 inches. If his room is rectangular, measuring 12 feet by 18 feet, how many such tiles will he need?
A 144
B 1152
C 1728
D 20736

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