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Mechanical and Electrical Design of Pumping Station


Quiz Questions

1. Axial-flow impeller, mixed-flow impeller & centrifugal volute ( radial-flow) type are the three classifications of the centrifugal pumps used for flood protection pumping stations.
True
False
2. Pumps are usually classified by their specific speed. And it is denoted by the equation
Eq 5-1
Eq 5-2
3. The impellers of the ___________ pumps have blades shaped like a propeller.
Axial
Mixed
Radial
4. A special design of the ___________ pump has a non-clog impeller which makes it very useful for pumping sewage.
Triode
Mixed
Centrifugal
5. The impeller of the ___________ pumps develops head or discharge pressure by a combination of both a lifting action and a centrifugal force.
Axial
Mixed
Radial
6. NPSH is abbreviated as _____________________.
Net positive suction head
Net position suction head
7. Submersible pumps are considered for stations that have pumping requirements with each pump having a capacity less than 6 m3/s (200 cfs).
True
False
8. ____________ is defined as the setting of the impeller eye of the pump with respect to the water surface in the suction sump area.
Suction
Surge
Submergence
9. The discharge system in a pumping station is not to convey the pumped water from the pumps to the receiving body of water..
True
False
10. Discharge piping to pump connections is generally made by means of a flexible coupling with harness bolts across the connection
True
False
11. Internal combustion engines used for pump drivers are of the diesel or gas-fueled type.
True
False
12. Engines more than 450 kW (600 HP) may be equipped with a manual clutch mechanism, which allows the engine to be started and operated without running the pump.
True
False
13. Roller gates are used when the gate opening is too large for slide gates.
True
False
14. Pumping units with discharges greater than 600 millimeters (24 inches) should be fitted with detectors to determine the temperature of each pump bowl bearing.
True
False
15. As a general rule-of-thumb, motors of 150 kW (200 HP) and below are usually most economically operated at 480 volts.
True
False
16. ____________________ Motors of either the squirrel-cage induction or synchronous type are the preferred drives for pumps installed in flood-protection pumping stations.
Constant-speed
Variable speed
17. What are the basic variables that classify the motor performance type?
Starting current, voltage, starting torque
Starting torque, starting current, Slip
18. A programmable controller (PLC) should be considered for usage when the controls or monitoring requirements of the station become complex.
True
False
19. Eq 20-1 & Eq 20-2 represents ________________________.
Output ratings of the equipment motors
Output ratings of the equipment heaters
20. Rigid galvanized steel conduit is the most commonly used material for raceways and is suitable for all locations where wiring is required within a pumping station.
True
False

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