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WorksheetsRotary and Centrifugal Air Compressors Quiz
Total questions: 40
Worksheet time: 20mins
What is the primary function of a rotary screw air compressor?
To generate heat
To compress air continuously
To store air for later use
To cool the air intake
What type of rotors does a rotary screw air compressor use?
Single-blade rotor
Multi-stage turbine rotor
Male and female interlocking rotors
Piston and cylinder assembly
Which component is responsible for separating oil from compressed air?
Air filter
Oil separator
Drive motor
Diffuser
What is the purpose of the oil cooler in a rotary screw compressor?
To store excess oil
To prevent oil contamination
To reduce the oil temperature
To filter air impurities
Before disassembling a rotary screw compressor, what is the first step?
Remove the rotors
Shut down the system and isolate power
Drain the oil
Disconnect the air intake
What happens if the oil separator fails?
Oil will mix with compressed air
The compressor will overheat
The air filter will clog
Pressure will drop suddenly
What should be inspected on the rotors during maintenance?
Color
Length
Wear and scoring
Weight
Which of the following is not a component of a rotary screw compressor?
Volute
Rotors
Oil cooler
Oil separator
What tool is commonly used to remove bearings from the shaft?
Pliers
Bearing puller
Screwdriver
Hammer
What is the purpose of the air receiver tank?
To store compressed air and stabilize pressure
To cool the compressed air
To separate oil from air
To filter impurities
What component prevents backflow of compressed air?
Pressure switch
Check valve
Oil filter
Drive motor
If a rotary screw compressor has low pressure output, what is a possible cause?
Excessive oil temperature
Worn or damaged rotors
Loose electrical wiring
High air intake
How are the male and female rotors positioned inside the compressor?
Side by side
One above the other
Interlocking and rotating together
In separate chambers
What should be done before reassembling the compressor?
Replace all bolts
Inspect and clean all components
Install new bearings
Reduce air pressure
What is the function of the air intake valve?
To release excess air
To filter contaminants
To control airflow into the compressor
To separate oil from air
What could cause excessive vibration in a rotary screw compressor?
Low oil level
Misalignment or worn bearings
High ambient temperature
Clogged air filter
Which component houses the rotors and directs airflow?
Oil cooler
Compressor housing
Air receiver tank
Drive motor
What safety procedure must be followed before disassembling the compressor?
Increase air pressure
Run the compressor at low speed
Follow lockout/tagout procedures
Increase oil temperature
What is the primary sign of a clogged oil separator?
Low airflow
Excessive heat
Oil leakage in the discharge line
Increased vibration
If a compressor is overheating, what should be checked first?
Voltage supply
Oil cooler and ventilation
Air intake valve
Pressure switch
What is the primary working principle of a centrifugal air compressor?
Positive displacement
Increasing air velocity and converting it into pressure
Using pistons to compress air
Recirculating air in a closed loop
What component converts the velocity of air into pressure?
Impeller
Diffuser
Shaft
Air filter
Which part collects compressed air and directs it to the discharge?
Diffuser
Volute
Shaft
Bearings
What is the function of the impeller?
To increase air velocity
To filter impurities
To regulate pressure
To cool the air
What should be done before disassembling a centrifugal air compressor?
Increase the speed
Drain the lubrication oil
Remove the impeller first
Reduce voltage supply
What is the primary function of bearings in a centrifugal air compressor?
To support the shaft and reduce friction
To regulate air pressure
To filter incoming air
To cool the compressor
If the impeller is worn, what might happen?
Higher airflow
Reduced pressure output
Increased oil leakage
Unstable temperature
What tool is used to remove bearings from the shaft?
Bearing puller
Wrench
Screwdriver
Hammer
Why is it important to inspect the seals before reassembly?
To ensure they prevent air and oil leaks
To increase air pressure
To improve motor efficiency
To reduce oil temperature
What should be checked during compressor reassembly?
Alignment of components
Only the impeller condition
Air filter quality
Electrical wiring only
What happens if the diffuser is clogged?
Air pressure increases
Airflow is restricted
Impeller speed increases
Oil consumption rises
If a centrifugal compressor produces excessive vibration, what could be the cause?
High air intake
Misalignment or worn bearings
Low temperature
Clogged oil separator
How is an impeller secured to the shaft?
By friction
By bolts or fasteners
By welding
By adhesive
What should be monitored during compressor testing?
Noise, vibration, and pressure levels
Voltage only
Oil color
Air filter clogging
What is the last step in reassembling a centrifugal air compressor?
Running the compressor for a few minutes
Tightening all bolts excessively
Installing the air filter
Applying lubrication
What is the purpose of the volute?
To store compressed air
To increase airflow speed
To collect compressed air and direct it to discharge
To cool the compressed air
What is a possible reason for low-pressure output?
Damaged impeller
High oil temperature
Faulty air filter
Over-tightened bolts
What should be done if a compressor has an air leak?
Replace seals and tighten connections
Increase speed
Reduce oil levels
Run the compressor at full load
What test is performed after reassembly?
Leak and pressure test
Voltage test
Filter replacement
Cleaning the compressor
Why is proper alignment important in reassembly?
To prevent excessive vibration
To reduce power consumption
To increase oil usage
To lower air intake
