This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Model Testing of Partially Submerged Bodies”.
1. What is model testing?
a) Performance testing
b) Partial testing
c) Function testing
d) Overall testing
View Answer
Explanation: The process in fluid mechanics that is used to study the complex fluid dynamics is called as model testing. It is a performance testing. It helps to test models after a standard scaling. Models are usually smaller than the final design.
2. The performance test is completed after completion of________
a) Casing inspection
b) Regulation
c) Pump enhancement
d) Hydrostatic check
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Explanation: The pump casting test starts with the inspection of material. It is a Non-destructive testing method. It is completed after completion of casting inspection. It depends on the pump design.
3. Which test is performed after the pump inspection?
a) Casing inspection
b) Casing hydrostatic test
c) NPSH test
d) Mechanical running test
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Explanation: After the inspection, the pump casing hydrostatic test is performed. It takes place only after successful completion of the pump casing inspection.
4. The pump hydrostatic test is tested at __________
a) 2 times the maximum allowable work pressure
b) 3 times the maximum allowable work pressure
c) 5 times the maximum allowable work pressure
d) 1.5 times the maximum allowable work pressure
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Explanation: The pump hydrostatic test is tested at 1.5 times the maximum allowable work pressure. It can be found out on the pump datasheet. The pump inspector does not require the calculation of pressure test.
5. What does SME stand for?
a) Subject mass export
b) Subject mass expert
c) Subject matter expert
d) Subject matter export
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Explanation: SME stands for Subject Matter Expert. After the inspector has made an inspection on the finished material. It is further sent to the SME. The main function of the SME is to approve the finished material.
6. What does NPSH stand for?
a) Net positive suction head
b) Net positive super head
c) Net planar suction head
d) Non-planar suction head
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Explanation: NPSH stands for Net Positive Suction Head. The main function of the NPSH test is to measure the ability of the pump. It helps to avoid cavitation at the inlet section of the pump.
7. How long is the pump mechanical run test performed?
a) 1 hour
b) 2 hours
c) 3 hours
d) 4 hours
View Answer
Explanation: Pump Mechanical run test is performed for nearly 4 hours. Its main function is to prove that pump works under stable condition. It also helps to determine if all the variables are within the acceptance range.
8. Which among the following is not a pump operating parameter?
a) Power consumption
b) Bearing temperature
c) Density
d) Shaft speed
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Explanation: Every parameter plays an important role in determining the pump operation. Density is not a parameter on pump mechanical run test. Each parameter operate for nearly 10 to 15 minutes.
9. A test that is performed at different flow rates is__________
a) Casing inspection
b) Casing hydrostatic test
c) NPSH test
d) Vibration test
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Explanation: Pump vibration testing is performed during the performance test at different flow rates. It also takes place during the mechanical running test at a rated flow rate.
10. What does FFT in vibration testing stand for?
a) Fast Fourier Transformation
b) Fast Foil Temperature
c) Fast Foil Transformation
d) Feature Fourier Transformation
View Answer
Explanation: FFT stands for Fast Fourier Transformation. Depending on the pump design, housing and vibration it is measured and plotted. FFT is a spectrum which denotes each data point from minimum to maximum.
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