Fluid Mechanics problems
- 1. When the momentum of one fluid is used for moving another fluid, such a device is called a/an
Options- A. jet pump
- B. blower
- C. acid egg
- D. none of these Discuss
Correct Answer: jet pump
- 2. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity
Options- A. same as that of A.
- B. one fourth as that of A.
- C. twice as that of A.
- D. four times as that of A. Discuss
Correct Answer: one fourth as that of A.
- 3. The normal stress is the same in all directions at a point in a fluid, when the fluid is
Options- A. non-viscous.
- B. incompressible.
- C. both (a) and (b).
- D. having no motion of one fluid layer relative to the other. Discuss
Correct Answer: having no motion of one fluid layer relative to the other.
- 4. The maximum delivery pressure of compressors can be upto __________ atmospheres.
Options- A. 10
- B. 100
- C. 250
- D. 1000 Discuss
Correct Answer: 1000
- 5. Molten soap mass is transported by a __________ pump.
Options- A. diaphragm
- B. reciprocating
- C. gear
- D. centrifugal Discuss
Correct Answer: centrifugal
- 6. For the transfer of solution of thick slurry, the pump used is a __________ pump.
Options- A. reciprocating
- B. gear
- C. diaphragm
- D. centrifugal Discuss
Correct Answer: diaphragm
- 7. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the
Options- A. discharge.
- B. suction.
- C. suction minus vapor pressure of the liquid at suction temperature.
- D. discharge minus vapor pressure of the liquid at the discharge temperature. Discuss
Correct Answer: suction minus vapor pressure of the liquid at suction temperature.
- 8. __________ pumps are axial flow pumps.
Options- A. Turbine
- B. Propeller
- C. Diffuser
- D. none of these Discuss
Correct Answer: Propeller
- 9. A Bingham fluid of viscosity ? = 10 Pa.s and yield stress, ?0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is
Options- A. 10 KPa
- B. 20 KPa
- C. 30 KPa
- D. 40 KPa Discuss
Correct Answer: 20 KPa
- 10. Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.
Options- A. smaller than
- B. larger than
- C. same as
- D. twice Discuss
Correct Answer: smaller than
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