Question 1

eg. What is the capital of france?

Accepted Answer

eg. Paris

Answer

Rome

Answer

London

Answer

Amsterdam

Question 2

What is the basic source of system air used in pneumatic systems?

Accepted Answer

The atmosphere

Answer

Oceanic evaporation

Answer

Cryogenic storage

Answer

Industrial tanks

Question 3

What are the main gases that make up atmospheric air?

Accepted Answer

79% Nitrogen, 20% Oxygen, 1% other gases

Answer

50% Hydrogen, 30% Oxygen, 20% Nitrogen

Answer

60% Carbon Dioxide, 30% Argon, 10% Oxygen

Answer

70% Oxygen, 28% Nitrogen, 2% CO₂

Question 4

Why is water vapor in atmospheric air a concern for pneumatic systems?

Accepted Answer

It can condense into liquid water and accumulate in system lines

Answer

It replaces the need for lubrication in pneumatic tools

Answer

It can corrode the outer body of the compressor

Answer

It improves the system’s efficiency

Question 5

What is the purpose of conditioning air before use in pneumatic systems?

Accepted Answer

To ensure efficient operation and minimize equipment service

Answer

To add friction to air for better movement

Answer

To increase the air density to maximum levels

Answer

To cool the system below freezing

Question 6

What does compressing air do to its volume and pressure?

Accepted Answer

Decreases volume and increases pressure

Answer

Decreases both volume and pressure

Answer

Increases volume and decreases pressure

Answer

Increases both volume and pressure

Question 7

What is 'isothermal compression'?

Accepted Answer

Compression where heat is removed and temperature remains constant

Answer

Compression where heat is retained to raise pressure

Answer

Cooling process using liquid nitrogen

Answer

Expansion process involving heat addition

Question 8

What happens during isothermal expansion?

Accepted Answer

Heat must be added to maintain constant temperature as volume increases

Answer

Heat is not involved in the process

Answer

Temperature decreases as volume increases

Answer

Heat must be removed to increase pressure

Question 9

According to the Gas Law, what happens if pressure increases while volume is fixed?

Accepted Answer

Temperature slightly increases due to heat of compression

Answer

Temperature decreases and pressure stabilizes

Answer

Volume expands to compensate

Answer

Temperature remains unaffected

Question 10

How does an increase in air temperature affect the receiver in a pneumatic system?

Accepted Answer

It increases pressure in the fixed-volume receiver

Answer

It reduces the efficiency of the compressor

Answer

It reduces the air density drastically

Answer

It allows air to escape through safety valves

Question 11

What components are commonly removed during air conditioning in pneumatic systems?

Accepted Answer

Dirt, water vapor, heat

Answer

Grease, oil, rubber particles

Answer

Ozone, helium, carbon

Answer

Oxygen, argon, nitrogen

Question 12

What happens to air temperature when it is compressed?

Accepted Answer

Temperature increases due to heat generated during compression

Answer

Temperature remains constant unless cooled

Answer

Temperature decreases immediately

Answer

Temperature depends on external humidity

Question 13

What defines adiabatic compression?

Accepted Answer

All heat from compression is retained, raising pressure above volume-only levels

Answer

The system uses external fans for cooling

Answer

All heat is removed, keeping temperature constant

Answer

The air is expanded to reduce pressure

Question 14

What happens in adiabatic expansion?

Accepted Answer

No heat is transferred to or from the system during expansion

Answer

Air is vented out to reduce temperature

Answer

The system loses pressure rapidly

Answer

Heat is added to the air to maintain temperature

Question 15

In reality, how does actual air compression compare to ideal models?

Accepted Answer

It falls between isothermal and adiabatic compression

Answer

It is completely isothermal

Answer

It does not follow any theoretical model

Answer

It follows the adiabatic curve exactly

Question 16

What does the area between the actual and adiabatic compression curves represent?

Accepted Answer

Heat lost to the atmosphere

Answer

The ideal compression work

Answer

Pressure loss due to leaks

Answer

Increase in air density

Question 17

What must be used when applying gas laws to pressure and temperature?

Accepted Answer

Absolute scales of temperature and pressure

Answer

Ambient temperature and relative pressure

Answer

Kelvin for pressure, Celsius for temperature

Answer

Gauge pressure and Fahrenheit temperature

Question 18

What happens to chamber air pressure when air enters a fixed-volume space?

Accepted Answer

Pressure increases with a slight temperature rise

Answer

Temperature drops dramatically

Answer

The volume expands

Answer

Pressure stays the same

Question 19

What is the effect of the heat of compression on air in the receiver?

Accepted Answer

It warms the existing air, increasing pressure

Answer

It has no impact unless mixed with oil

Answer

It causes air molecules to break down

Answer

It allows the air to condense

Question 20

Why must entrapped dirt be removed before using atmospheric air in pneumatic systems?

Accepted Answer

It causes internal wear in the compressor and components

Answer

It changes the color of air

Answer

It helps regulate flow rates

Answer

It improves conductivity