Fluid Machinery โ MCQ Quiz (10 Questions)
Choose one option per question. Click Show Answer to reveal the correct option (and short explanation).
1
Euler’s turbomachinery equation primarily relates which of the following?
Correct: A
Euler’s equation describes energy transfer between the rotor and the fluid (change in fluid’s angular momentum โ energy/torque exchange).
2
A Pelton wheel turbine is most suitable for which condition?
Correct: B
Pelton wheels are impulse turbines best used for high head and relatively low flow applications.
3
What type of turbine is the Kaplan turbine?
Correct: C
Kaplan turbines are reaction machines with axial flow and adjustable blades โ ideal for low head, high flow.
4
Cavitation in pumps occurs when:
Correct: A
Cavitation bubbles form when local pressure drops below vapor pressure; their collapse causes damage and noise.
5
Specific speed (Ns) of a turbine helps to:
Correct: D
Specific speed groups turbines by shape/performance (helps choose between Pelton, Francis, Kaplan, etc. for given flow & head).
6
What is the primary purpose of specifying required NPSH (Net Positive Suction Head) for a pump?
Correct: C
Required NPSH tells you the minimum suction head needed at pump inlet to prevent cavitation.
7
Which of the following is a positive displacement pump?
Correct: B
Gear pumps are positive displacement machines that deliver a fixed volume per revolution (good for viscous fluids and metering).
8
The efficiency of a centrifugal pump is maximum near which operating point?
Correct: A
Centrifugal pumps are most efficient near their Best Efficiency Point โ the design operating point.
9
Flow through a Francis turbine is best described as:
Correct: C
Francis turbines operate with mixed flow โ the flow has radial and axial components through the runner.
10
What is the main function of a draft tube in a reaction turbine?
Correct: B
Draft tubes convert the kinetic energy of the exiting fluid into pressure, increasing the effective head and efficiency.
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