30 Questions
What type of compressors are examples of dynamic compressors?
Centrifugal and axial flow compressors
In a single-acting reciprocating compressor, how many compression strokes occur per crankshaft revolution?
One
What determines whether a two-stage or multistage compressor is used?
The required air pressure
Which type of cylinder arrangement is usually used for the single-acting type of compressor?
Vertical
What is the main purpose of an intercooler on a compressor?
To reduce the temperature and volume of the gas
Which part of a compressor is responsible for controlling the flow of air entering and leaving?
Suction and discharge valves
What type of compressor is commonly used for gas compression?
Sliding vane
Which part of the cylinder serves the purpose of air-cooling?
Integral fins
What is the purpose of the lower piston ring in a compressor?
To distribute the lubricating oil and prevent excess oil from escaping
What causes a non-flexible ring valve to lift off its seat in a compressor?
Combined force of vapor pressure on top of the ring and tension of the springs
Why is it important to repair leaking compressor valves as soon as possible?
To prevent damage to the compressor
What is the purpose of a water jacket in a sliding vane compressor?
To cool the cylindrical rotor and support bearings
What is a common driver used with centrifugal compressors?
Electric motors
Why do centrifugal compressors supply oil-free air?
They have simple and rugged construction
What is the main limitation of centrifugal compressors?
Low efficiency
What is the airflow direction in an axial flow compressor?
Axial (parallel) to the compressor shaft
What constitutes a stage in an axial flow compressor?
Each pair of moving and fixed blades
Why is a large number of stages required in an axial flow compressor?
To attain high pressure
What is the purpose of using self-contained breathing apparatus (SCBA) by firefighters?
To provide compressed breathing air while entering burning buildings
What is a common use of compressed nitrous oxide?
To make whipped cream
Why are gases more easily compressed than liquids?
Liquids have a fixed volume, while gases do not
What does Bernoulli’s principle explain the relationship between?
Pressure and velocity
What do compressors focus on managing?
Volume, pressure, heat, and velocity
How are compressors classified?
As positive displacement and dynamic compressors
Which type of compressor does not require inlet or discharge valves?
Rotary lobe compressor
What is the advantage of a centrifugal compressor over other types?
It does not require internal lubrication
Which type of compressor is suitable for high speeds ranging from 3000 rpm to 12,000 rpm?
Rotary screw compressor
What is the advantage of a rotary screw compressor over other types?
It produces oil-free air
Which type of compressor is more tolerant of liquids in gases?
Scroll compressor
What is the advantage of the sliding vane compressor over the reciprocating compressor?
Lower cost
Test your knowledge about machine parts and cooling systems with this quiz. Learn about the assembly of parts, the use of gaskets, air-cooling, water jackets, and cylinder liners. Understand the features and functions of crankshafts in machines.
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