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31 Cards in this Set
- Front
- Back
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9. What device uses the fact that when an electrical current flows through a wire which has several loops placed tightly together, a magnetic field
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5 What is the difference between AC and DC current.
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1 ldentify the three main components of an atom, electrons nuetrons and
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3Fillintheblanksfqrthedefinitionofelectricalcqry!]nt.,!Erectricar current is rhe movem *, * EfrWw' rrom a Wil,ulffwcharged object to a positively charged objec
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8. An electric current produces
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Write the formula for tanqent in terms of sine and cosine.
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Ohms Law = V = I x R
V = Voltage I = Current x Resistance |
Power equals Current times Voltage |
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In a series AC circuit is the instantaneous and resistance is equal in all parts of the circuit |
Inductive reactance is always 90 degrees out of phase
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A delta system normally does not have a neutral wire |
The line voltage of a delta connected system is equal to the phase voltage |
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The line voltage of a wye connected system lags the phase voltage |
The line current of a connected of a wye connected system is lags the phase current |
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The line current of a delta connected system is equal to the 1.73 phase current |
Three phase alternators produce three separate voltages that how many electrical degrees 120 apart |
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If the phase voltage of a four wire wye connected system is 277 Volts. What is line Voltage 480 Volts |
If the phase voltage of delta connected system is 277 volts the voltage is 277 volts |
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A delta connected system can be connected directly to wye connected |
A wye connected system can have three or four wires |
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The two main components of an induction motor is rotor stator |
The maximum rotational speed of an induction motor is called the synchronous speed |
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Induction motors cause current to lag voltage |
The frequency of the current being fed to a motor has no effect on the speed of rotation |
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Synchronous motors are good for loads that require frequent stopping and starting |
In a three motor continually changing phase currents in the stator windings create a rotating Magnetic Field |
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Soft starts lower the input voltage which results in lower torque |
The line voltage and the phase voltage are equal in a delta connected system |
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Which type of transformer best fits the application if it is necessary to increase the primary voltage from 120 v 480 v secondary step up |
A tapped transformer is used to allow for slight variations in inlet voltage |
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In a three phase transformer which of the Wye Primary/Alpha Secondary |
A dissolved oxygen (DO) probe is considered a primary element |
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DCS stands for Distributive Control System |
PlC stands for Programable Logic Controller |
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A sensor is a primary element |
A thermometer is a primary element |
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Data is sent to the controller by the transmitter |
A pressure sensor |
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Inductive reactance is always 90 degrees out of phase
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Ohm's law is voltage equals current times resistance
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The effective power value Is the same as root mean square value
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Integral Control helps overcome Offset |
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Hertz it is the same as cycles per second
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Most industrial loads are inductive
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Pressure is equal t force divided by area
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Venturi and Orifice meters are used for full pipe flow
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Weirs are used for Open channel flowThe two types of Weirs are Broad and Sharp CrestedPalmer-Bowlus flumes are used in manholes
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Current and Magnetic meters are two types of velocity meters
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Hydraulic Actuator uses pressurized oil as its energy source
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Synchronous Motors are good for loads that require frequent starting and stopping
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True Power is the straight line on a right triangle. while Apparent Power goes up, and Apparent Power is vertical
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The difference between the synchronous speed of a motor and the actual speed is called Slip
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In a three phase motor the continually changing phase currents in the stator windings create a rotating magnetic field
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Induction motors cause current to Lag voltage
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MetersTurbine meters do not measure raw sewage flow
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Reflective and Transmissive are two types of Ultrasonic Flow Meters
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A pitot tube can used to measure both air and water flow
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A nutating disc flow meter is often used for home water services
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A diaphram is what most electromechanical sensors have in common
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Open channel flow is measured with a flume
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The two types of Weirs are Broad and Sharp Crested
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To operate a magnetic flow meters properly it must have a full pipe of liquid
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