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WorksheetsCentrifugal and Vane Pump Questions
Total questions: 20
Worksheet time: 10mins
During disassembly, you notice that the impeller is stuck on the shaft. What is the safest method to remove it?
Hit it forcefully with a hammer
Use an impeller puller and apply gradual pressure
Heat the impeller with a torch to expand it
Use a wrench to twist it off
A newly assembled centrifugal pump is experiencing reduced flow even though the motor is running at full speed. What could be the cause?
The impeller is installed backwards
The discharge valve is fully open
The bearings were replaced with oversized ones
The pump casing bolts are too tight
After reassembling the pump, you find excessive leakage around the pump casing. What should you check first?
The alignment of the pump to the motor
The torque specification of the casing bolts
The size of the suction pipe
The impeller clearance
While running a test after reassembly, you notice the pump is producing cavitation sounds. What could be the reason?
The suction line is partially blocked
The impeller is oversized for the pump casing
The pump speed is too low
The discharge valve is fully closed
A centrifugal pump is making excessive noise after reassembly. What could be the issue?
The shaft is over-lubricated
The impeller is misaligned or damaged
The suction line is too short
The discharge valve is stuck open
A vane pump you reassembled is failing to prime. What should you check first?
The drive shaft lubrication
The end plates for leaks
The suction line for air leaks
The vanes for correct positioning
During disassembly, you find that the vanes are unevenly worn. What does this indicate?
The rotor is spinning too slowly
The cam ring is worn or damaged
The pump was running without lubrication
The bearings are over-tightened
After reassembling a vane pump, the system pressure is unstable. What is the most likely issue?
The vanes are installed in the wrong direction
The rotor is spinning too fast
The seals were not cleaned properly
The impeller was damaged
While testing a newly assembled vane pump, you hear a high-pitched noise. What could be the cause?
The pump is running dry due to a suction issue
The rotor is moving too slowly
The vanes are too loose
The cam ring is misaligned
If a vane pump has excessive leakage at the end plates, what is the most likely cause?
The vanes are over-lubricated
The seals or gaskets are worn
The pump casing is misaligned
The rotor is spinning too fast
You are reassembling a screw pump and notice that the rotor does not fit smoothly into the casing. What should you check?
The torque on the pump casing bolts
The alignment of the bearings and shaft
The lubrication level in the pump
The speed of the drive motor
After a screw pump is reassembled, it starts vibrating excessively. What is the possible cause?
The discharge valve is closed
The pump is over-lubricated
The rotor is out of balance or misaligned
The suction pressure is too high
What is the most important consideration when reinstalling the bearings in a screw pump?
The speed at which the pump will operate
Ensuring the bearings are properly lubricated and aligned
Tightening the bearing housing bolts as much as possible
The size of the suction and discharge pipes
A screw pump is making a grinding noise after assembly. What could be causing this?
Worn or improperly installed bearings
The motor is running at too low a speed
The rotor is too small for the casing
The pump is overfilled with lubricant
If the flow rate of a screw pump is lower than expected after reassembly, what should you check?
The alignment of the rotor and shaft
The air filter in the system
The voltage of the motor
The tightness of the pump bolts
While disassembling a reciprocating air compressor, you notice excessive wear on the piston rings. What is the most likely cause?
The cylinder was over-lubricated
High operating temperatures or poor lubrication
The air filter was too clean
The compressor was running at too low a pressure
After reassembling a reciprocating air compressor, it produces excessive knocking sounds. What should you check?
The belt tension
The piston and crankshaft alignment
The air intake pressure
The oil level in the crankcase
What should be done before reinstalling the cylinder head after compressor maintenance?
Apply oil to the intake valves
Clean the cylinder surface and install a new gasket
Rotate the piston manually
Drain the crankcase oil
A reciprocating air compressor is running but fails to build up pressure. What is the most likely cause?
The piston rings are worn or improperly installed
The discharge valve is closed
The crankshaft is rotating too fast
The oil level is too high
After reassembling a reciprocating air compressor, the unit is overheating. What should you check first?
The lubrication system
The crankshaft alignment
The air filter condition
The cylinder head bolts
