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20 Cards in this Set
- Front
- Back
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Why is it so important to monitor the speed of a variable speed pump? |
To prevent cavitation from occurring |
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Which basic electrical unit is used to measure a materials opposition to the flow of electricity? |
Ohm |
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The first oil change on a new pump should be done _____? |
After one month of operation |
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How often should the temperature of a centrifugall pump motor bearings be checked with a thermometer? |
Once a month |
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All sensors that respond to liquid pressure will perform poorly if _____ enters the sensor. |
Air |
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Packing replacement is usually performed when? |
No further tightening can be done on the packing gland |
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Which device changes alternating current to direct current by allowing the electric current to flow in One Direction but blocking flow in the opposite direction? |
Rectifier |
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To ease installation of impeller wear rings, they can be _____? |
Heated |
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Packing is designed to? |
Wear and deteriorate with normal use |
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Bearings on a line shaft turbine can be lubricated with? |
Oil or water |
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Insulators usually fail because of? |
Excessive Heat |
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Although some phase imbalance will occur in any system, in general, it should not exceed? |
5% |
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Nitrification in the distribution system can best be described as the? |
Oxidation of ammonia to nitrites then to nitrates |
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Which type of rigid coupling is easy to install and remove? |
Split coupling |
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Which is the correct equation for Ohm's law? |
Volts = (amps)(ohms) |
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Which of the basic components of every Telemetry system? |
Transmitter, transmission Channel, and receiver |
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The anodes placed in a water storage tank for cathodic protection usually last _____, and should be inspected every _____. |
10 years; year |
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In general, the current drawn by a motor the instant it is connected to the power source, called the locked motor current, is usually _____ times the normal full load current of the motor. |
5.0 - 10.0 |
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Most Telemetry equipment transmit information by? |
Digital signals |
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Control Systems consists of the following distinct components: |
Signal conditioners, actuators, and control elements |
