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WorksheetsCentrifugal and Vane Pump Quiz
Total questions: 20
Worksheet time: 10mins
You are tasked with disassembling a centrifugal pump that has been experiencing low pressure. What is the FIRST step you should take before starting the disassembly?
Drain the pump casing
Check for leaks in the pump housing
Disconnect the pump from the power source (LOTO procedure)
Remove the impeller
While inspecting a centrifugal pump’s impeller, you notice severe erosion on the blades. What is the most likely cause?
Excessive vibration
Cavitation due to low suction pressure
Misalignment of the pump shaft
Faulty bearing installation
During reassembly, how should the pump casing bolts be tightened to ensure proper sealing?
Randomly tightening bolts in any order
Using maximum force on each bolt individually
Evenly in a crisscross pattern
Only tightening bolts on one side first
After assembling the centrifugal pump, it is running but producing excessive noise. What should you check first?
The condition of the bearings
The temperature of the impeller
The alignment of the suction and discharge pipes
The presence of air bubbles in the fluid
A centrifugal pump you recently assembled is overheating. What is a possible cause?
The impeller is rotating too slowly
Misalignment or lack of lubrication in the bearings
Insufficient pressure at the discharge
Excessive water in the pump casing
A vane pump in a hydraulic system is providing inconsistent flow. What is the FIRST component you should inspect?
Bearings
Vanes
End plates
Cam ring
While disassembling a vane pump, one of the vanes is stuck inside the rotor slot. What tool should you use to remove it without damage?
Torque wrench
Bearing puller
Vane puller
Mallet
During reassembly, why is it essential to lubricate the vanes before placing them back into the rotor?
To prevent vanes from sticking during startup
To increase pump pressure
To reduce energy consumption
To allow the rotor to spin faster
After assembling a vane pump, the system pressure is low. What is the most likely reason?
The rotor is misaligned with the cam ring
The bearings were over-lubricated
The suction line was cleaned too thoroughly
The pump casing was over-tightened
If a newly assembled vane pump starts vibrating excessively, what should you check?
The size of the suction and discharge pipes
The rotor balance and vane conditions
The speed of the driving motor
The tightness of the pump housing bolts
You are disassembling a screw pump for maintenance. What should you do first?
Remove the drive shaft
Disconnect the power supply and drain the fluid
Remove the rotor assembly
Open the end plates
After disassembling a screw pump, you notice deep scratches on the rotor. What is the most likely cause?
Misalignment of the end plates
Bearings being too tight
Foreign particles in the pump fluid
Loose coupling between the motor and pump
A newly assembled screw pump is leaking fluid at the shaft. What should you inspect?
The alignment of the rotor
The condition and installation of the shaft seals
The suction pressure
The tension on the motor coupling
Why is it important to install the bearings correctly when reassembling a screw pump?
To prevent excessive vibration and wear
To increase the rotation speed of the pump
To allow the shaft to flex during operation
To make it easier to disassemble next time
A screw pump starts running noisily right after assembly. What is the first thing to check?
The balance of the rotors
The torque on the motor bolts
The flow rate of the liquid
The suction and discharge valves
Before disassembling a reciprocating air compressor, what critical safety step must be performed?
Drain the crankcase oil
Remove the air filters
Depressurize the air tank
Disconnect the intake valves
You are inspecting a reciprocating compressor and notice excessive carbon buildup on the piston rings. What could be the cause?
Excessive lubrication
Worn bearings
High moisture content in the air supply
Improper valve timing
After reassembling a reciprocating air compressor, it runs but produces significantly lower pressure than expected. What is a possible cause?
The piston rings are not properly seated
The oil was not changed during assembly
The suction line is too short
The air tank has excess moisture
What is the main function of the crankshaft in a reciprocating air compressor?
To store compressed air
To convert rotational energy into linear motion
To reduce noise and vibration
To control the airflow in the valves
While reassembling a reciprocating air compressor, why is it important to apply torque evenly to the cylinder head bolts?
To ensure proper airflow
To prevent warping of the cylinder head
To reduce wear on the crankshaft
To make future disassembly easier
