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1,150 Results Found
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AutoQuiz: Characteristics of a Control Valve
A rotary valve has a flow closure member that rotates in the flow stream to modify the amount of fluid passing through the valve. -
AutoQuiz: What Type of Electrical Enclosure Resists Corrosion and Provides Protection?
NEC 2002 defines an enclosure Type 4x as ideal for outdoor use and resistant to splashing water, windblown dust, hose directed water, and corrosion. -
AutoQuiz: What is the Coriolis Effect?
Using the Coriolis effect that causes a laterally vibrating tube to distort, a direct measurement of mass flow is obtainable using a Coriolis flowmeter. -
AutoQuiz: What Flowmeter Does Not Use an Obstruction?
A magnetic flowmeter is a volumetric flowmeter, which does not have any moving parts and is ideal for wastewater applications or any dirty liquid. -
AutoQuiz: Best Strategy for Finding Efficient Operating Points with Complex Shifting Process Conditions
Real-time optimization with a detailed process model is the best approach to fining the most efficient operating points. -
AutoQuiz: What Is the Application for an Impulse Line in Fluid Flow?
Impulse lines connect the process to the pressure transmitter, to reduce the effect of ambient temperature on the transmitter's operability and life span. -
AutoQuiz: Why Are Gathering Requirements Critical to the Success of an Automation Project?
Gathering requirements are important because they define the objectives, purpose, scope, needs, and other key meters. -
AutoQuiz: What Is the Process for a Continuity Check of a Field Transmitter?
A continuity check is performed on a length of finished wire or cable to determine if the electrical current flows continuously throughout the length. -
AutoQuiz: How to Measure and Compensate for Disturbances to Prevent Set Point Deviance
The objective of feedforward control is to measure disturbances and compensate for them before the controlled variable deviates from set point. -
AutoQuiz: What Is the Dead Band of an Instrument?
The dead band is the range through which an input signal may vary, upon reversal of direction, without initiating an observable change in output signal. -
AutoQuiz: How to Simultaneously Optimize an Interacting Dead-Time Dominant Process with Multiple Constraints
Model predictive control excels at dead-time dominance and simultaneous optimization while accounting for future prediction of proximity to constraints. -
AutoQuiz: What are the Closure Members in Globe and Butterfly Valves?
A butterfly valve has a circular body and a rotary-motion disk-closure member. The physical blocking mechanism in a globe valve is a plug. -
AutoQuiz: How Do You Assess Peak Performance for an Operating Unit?
Cost sheets show the best periods of operation, and data historians explain the conditions and relationships. -
AutoQuiz: How to Define the Flow Characteristic for a Valve
A linear flow characteristic is when flow capacity or (Cv) increases linearly with valve travel. Flow is directly proportional to valve travel. -
AutoQuiz: How to Detect a Fault in a Safety System
A proof test on a system may reveal faults that would otherwise not be mentioned by internal diagnostic measures and is therefore correct. -
AutoQuiz: How to Calculate the Output Signal Value of a Pneumatic Transmitter
There is a straightforward linear relationship between the units of pounds per square inch (psi) and degrees F (Fahrenheit). -
AutoQuiz: What is the Cause of a High Process Variability?
An oversized control valve will operate next to the seat where the friction and stick slip is greatest. -
AutoQuiz: How to Calculate Temperature for an Electronic Transmitter
There is a straightforward linear relationship between the units of milliamps and degrees. -
AutoQuiz: What is the Operating Principle of an AC Motor?
An AC motor consists of a rotor (rotating portion) with a laminated iron core containing copper bars in the slots. -
AutoQuiz: What is a Thermowell?
A thermowell is a closed-end tube that surrounds the measuring junction of a thermocouple.
