A. Decreases due to reduced viscosity
B. Decreases due to reduced vapour pressure
C. Increases due to increased vapour pressure
D. Decreases due to increased frictional resistance
Related Mcqs:
- A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?
A. Develops a lower head
B. Capacity is reduced
C. Requires more power
D. All A., B. and C. - The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the_____________________?
A. Barometric pressure
B. Speed of the impeller
C. Diameter of the impeller
D. Both B. and C. - Gear pump_________________?
A. Is a positive displacement pump
B. Is a centrifugal pump
C. Is a non-positive displacement pump
D. Can be started with delivery valve closed - Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?
A. H
B. 12.6 H
C. 13.6 H
D. 14.6 H - A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?
A. 10 m
B. 11 m
C. 11.8 m
D. 30 m - Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the___________________?
A. Pipe length
B. Fluid velocity in the pipe
C. Time taken to close the valve
D. All A., B. and C. - A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below: Δ P/L = 375 × 103 VOM + 10.94 × 106 V2 OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?
A. 0.2
B. 0.5
C. 0.7
D. 0.8 - What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir ?
A. Penstock
B. Siphon
C. Tunnel
D. Pressure pipeline - The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s) ?
A. 24000
B. 24
C. 0.24
D. 0.44 - Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be _____________________ ft?
A. 40
B. 34
C. 8
D. 37
