Term
| What are the six simple machines? |
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Definition
| Lever, pulley, wheel and axle, inclined plane, screw and gear. |
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Term
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Definition
| a rigid bar pivoting about a fulcrum. Beams are thick and heavy, built for rugged, heavy duty work. |
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Term
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Definition
| a tube with an oval section closed at one end and curved to form a section of a cicle, spiral or helix. |
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Term
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Definition
| a thin membrane that separates two pressures. Capable of supporting a force proportional to the differential pressure across it. |
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Term
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Definition
| A cylindrical, thin walled tube with corrugations called convolutions. It compares two different pressures. |
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Term
| What are the three pneumatic devices found in all pneumatic instruments? |
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Definition
| Flapper/nozzle error detector, pilot valve and pneumatic relay. |
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Term
| What is a pressure regulator? |
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Definition
| An instrument used to control air pressure to pneumatically operated quipment. |
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Term
| Three major components to a pressure regulator: |
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Definition
| a valve, diaphragm and a spring. |
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Term
| What is a snap acting relay? |
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Definition
| a pneumatic device that has the capability to change ports to switch or lock in secondary air source when the main supply pressure falls below the predetermined set point. |
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Term
| Without the bellows, a device would have: |
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Definition
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Term
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Definition
| flow to differential pressure, or differential pressure to flow. |
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Term
| Bypass restriction for adjusting dead band on a booster is accomplished with |
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Definition
| Bypass Restriction Adjusting Screw. |
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Term
| In a booster, a large sudden increase in the input signal will cause- |
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Definition
| a pressure differential to exist between the input signal and the output of the booster. |
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Term
| When testing voltages for a limit switch, get you readings from the- |
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Definition
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Term
| Restriction smaller than hole- |
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Definition
| air flows faster out orifice. |
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Term
| What is important to remember when removing reed switches? |
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Definition
| One only reed switch cannot be removed. |
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Term
| Four categories of effective levers: |
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Definition
| Angularity compensator, motion multiplier/divider, anti-arcing mechanism and non-linear level. |
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Term
| When assembling a target rock valve, the jam nut requires- |
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Definition
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Term
| In absence of differential pressure, the solenoid coil develops- |
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Definition
| sufficient force to open the valve. |
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Term
| If there is a problem with a regulator, you usually replace- |
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Definition
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Term
| If the output of a controller is erratic- |
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Definition
| slowly increase proportional band. |
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Term
| What is the amount of time it should take for a SPORV to open? |
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Definition
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Term
| When using Dampened Oscillation what do you use to calculate reset? |
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Definition
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Term
| What is the greatest country in the United States? |
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Definition
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Term
| When reworking a target rock valve, which two components do you always replace? |
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Definition
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Term
| When working on a valve or any other piece of equipment, to ensure safety what should you do? |
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Definition
| Verify ECO, upstream & downstream isolation valves closed, vent and drain lines open. |
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Term
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Definition
| Additional force applied to a valve plug once plug has contacted the seat. |
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Term
| What are the different flow characteristics? |
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Definition
| Quick opening(small input - large output), linear and equal percentage(large input - small output). |
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Term
| What determines spring range? |
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Definition
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Term
| On a positioner, what is applied to the Zero Adjustment Lock Nut? |
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Definition
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Term
| Who is the greatest Houston Texan to ever play the game of football? |
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Definition
| Jacoby "Mothaf***in" Jones! |
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Term
| Limit Switches change conditions at- |
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Definition
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Term
| What do you do when working on limit switches? |
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Definition
| Replace arm rubber boot and torque cover screws. |
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Term
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Definition
| A manually controled loop that is not self correcting. No feedback. |
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Term
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Definition
| Self correcting, automatically controlled. Has feedback. |
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Term
| Without flow, what could happen to a solenoid valve? |
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Definition
| It may cause damage from overheating and the coil to break down. |
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Term
| What are the 5 modes of pneumatic control? |
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Definition
| On-Off, Pneumatic, Pneumatic Plus Integral, Pneumatic Plus Derivative and Pneumatic Integral Plus Derivative. |
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Term
| What does a wide Proportional Band allow? |
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Definition
| Greater Offset, less gain, slower reaction and less oscillations. |
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Term
| What relationship do gain and proportional band have? |
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Definition
| They are inversely related. (PB=1/Gain) |
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Term
| What determines PID control corrective action? |
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Definition
| Magnitude of the error, length of time the error has existed and rate of change of the error. |
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Term
| Which 4 wave types are the same? |
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Definition
| Minimum area, 1/4 wave dampening aperiodic and Ziegler Nichols. |
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Term
| Which 4 wave types are the same? |
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Definition
| Minimum area, 1/4 wave dampening aperiodic and Ziegler Nichols. |
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Term
| Define System Capacitance. |
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Definition
| Characteristic of process that enables the process to store energy. |
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Term
| Define System Resistance. |
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Definition
| Characteristic of process that opposes the transfer of energy. |
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Term
| What affect does a large capacitance have on a controller? |
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Definition
| Longer lag time and slower change in controlled variable. |
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Term
| How does a two capacity process affect a system? |
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Definition
| Slower reactions and greater chance of oscillations. |
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Term
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Definition
| a power operated device which modifies the flow rate of a process control system in response to control system signals. |
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Term
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Definition
| a device that allows remote positioning of a control valve in response to eletrical, pneumatic or hydraulic control signals. |
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Term
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Definition
| A structure by which the diaphragm case or cylinder assembly is supported rigidly on the bonnet assembly. |
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Term
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Definition
| The pressure required to operate a given actuator full stroke without external forces or friction, such as packing frictions or fluid forces. |
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Term
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Definition
| The additional force applied to a valve plug once the plug has contacted the seat. |
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Term
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Definition
| The internal parts of the valve which are in flowing contact with the controlled fluid. |
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Term
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Definition
| a device which converts an input signal(pneumatic, electronic) to an output control signal which will position a control element(valve, damper) to the required position. |
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Term
| What are some systems in which a Copes-Vulcan is used? |
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Definition
Feedwater Control Valve - Bypass valve
Feedwater Control Valve
Several Safety-Related applications |
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Term
| What is a positioner's main purpose? |
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Definition
| Device used to position a piston or diaphragm actuated control valve. |
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Term
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Definition
| A two position control action. Outputs a signal that will position the final control element to one ofits two extremes. |
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Term
| Overshoot and undershoot is ___ for On-Off Control. |
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Definition
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Term
| Overshoot and undershoot is ___ for On-Off Control. |
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Definition
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Term
| What is Proportional Band? |
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Definition
| The percent of span measured variable must change in order to cause controller output(final control element) to change 100%. |
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Term
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Definition
| The residual error between set point and measured variable. It is caused by process load changes. |
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