Fluid Machines & Compressors

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Questions and Answers

In a system requiring both a high flow rate and a relatively low-pressure increase, which type of fluid machine is most suitable?

Positive displacement blower
Centrifugal compressor
Axial fan (correct)
Reciprocating compressor

A blower is selected for an application requiring a pressure ratio between 1.1 and 1.2. Which application aligns best with this pressure requirement?

Low-pressure HVAC system (correct)
Natural gas pipeline compression
Jet engine propulsion
Refrigeration cycle

Which type of compressor is most appropriate for an application requiring a consistent flow rate despite variable pressure demands?

Positive displacement compressor (correct)
Centrifugal compressor
Dynamic compressor
Axial compressor

A centrifugal fan with backward-curved blades is preferred over one with forward-curved blades in certain scenarios. Which factor most likely drives this preference?

Need for a non-overloading power characteristic and stable performance (C) Signup and view all the answers

In comparing axial and centrifugal compressors, what key difference dictates their application in either gas turbines or refrigeration systems?

Axial compressors excel in delivering high flow rates at high pressures, ideal for gas turbines. (A) Signup and view all the answers

Which scenario would most benefit from the integration of a Variable Speed Drive (VSD) with a centrifugal pump?

Reducing energy consumption in a system with variable flow rate requirements (D) Signup and view all the answers

A reciprocating compressor and a rotary screw compressor are being considered for an industrial application. What is the primary factor in deciding which one is most appropriate?

The need for high pressure at low flow rates (A) Signup and view all the answers

What is the most direct effect of increasing the speed of a fan, blower, or compressor, according to the affinity laws?

Increase in flow rate, increase in pressure, and a disproportionate increase in power (B) Signup and view all the answers

In an industrial setting, compressed air is essential for powering pneumatic tools. Which type of machine is specifically designed to provide this?

Compressor (C) Signup and view all the answers

A system requires the removal of stale air and the supply of fresh air in a building Which type of fluid machines are typically used for this application?

Fans and Blowers (D) Signup and view all the answers

Flashcards

Fans, Blowers, and Compressors

Fluid machines that increase gas pressure by converting mechanical energy into fluid energy, used for transport, ventilation, cooling & pressurization.

Fans

Move large gas volumes with a small pressure increase (pressure ratio < 1.1), used for ventilation, cooling, and circulation.

Axial Fans

Gas flows parallel to the rotation axis, using propeller-like blades for thrust. High flow rate, low pressure.

Centrifugal Fans

Gas enters axially, turns 90°, exits radially. Impeller rotates inside a scroll housing. Medium flow and pressure.