Machine Parts and Cooling Systems Quiz

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What type of compressors are examples of dynamic compressors?

Reciprocating compressors

Centrifugal and axial flow compressors (correct)

Rotary compressors

Single-acting compressors

In a single-acting reciprocating compressor, how many compression strokes occur per crankshaft revolution?

Two

One (correct)

Four

Three

What determines whether a two-stage or multistage compressor is used?

The type of gas being compressed

The cylinder arrangement

The cooling method used

The required air pressure (correct)

Which type of cylinder arrangement is usually used for the single-acting type of compressor?

Vertical Signup and view all the answers

What is the main purpose of an intercooler on a compressor?

To reduce the temperature and volume of the gas Signup and view all the answers

Which part of a compressor is responsible for controlling the flow of air entering and leaving?

Suction and discharge valves Signup and view all the answers

What type of compressor is commonly used for gas compression?

Sliding vane Signup and view all the answers

Which part of the cylinder serves the purpose of air-cooling?

Integral fins Signup and view all the answers

What is the purpose of the lower piston ring in a compressor?

To distribute the lubricating oil and prevent excess oil from escaping Signup and view all the answers

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 Signup and view all the answers

Why is it important to repair leaking compressor valves as soon as possible?

To prevent damage to the compressor Signup and view all the answers

What is the purpose of a water jacket in a sliding vane compressor?

To cool the cylindrical rotor and support bearings Signup and view all the answers

What is a common driver used with centrifugal compressors?

Electric motors Signup and view all the answers

Why do centrifugal compressors supply oil-free air?

They have simple and rugged construction Signup and view all the answers

What is the main limitation of centrifugal compressors?

Low efficiency Signup and view all the answers

What is the airflow direction in an axial flow compressor?

Axial (parallel) to the compressor shaft Signup and view all the answers

What constitutes a stage in an axial flow compressor?

Each pair of moving and fixed blades Signup and view all the answers

Why is a large number of stages required in an axial flow compressor?

To attain high pressure Signup and view all the answers

What is the purpose of using self-contained breathing apparatus (SCBA) by firefighters?

To provide compressed breathing air while entering burning buildings Signup and view all the answers

What is a common use of compressed nitrous oxide?

To make whipped cream Signup and view all the answers

Why are gases more easily compressed than liquids?

Liquids have a fixed volume, while gases do not Signup and view all the answers

What does Bernoulli’s principle explain the relationship between?

Pressure and velocity Signup and view all the answers

What do compressors focus on managing?

Volume, pressure, heat, and velocity Signup and view all the answers

How are compressors classified?

As positive displacement and dynamic compressors Signup and view all the answers

Which type of compressor does not require inlet or discharge valves?

Rotary lobe compressor Signup and view all the answers

What is the advantage of a centrifugal compressor over other types?

It does not require internal lubrication Signup and view all the answers

Which type of compressor is suitable for high speeds ranging from 3000 rpm to 12,000 rpm?

Rotary screw compressor Signup and view all the answers

What is the advantage of a rotary screw compressor over other types?

It produces oil-free air Signup and view all the answers

Which type of compressor is more tolerant of liquids in gases?

Scroll compressor Signup and view all the answers

What is the advantage of the sliding vane compressor over the reciprocating compressor?

Lower cost Signup and view all the answers