Domain 4 / Start-Up Flashcards
The \_\_\_\_\_\_\_\_ variable is the part of a process which is adjusted to close the gap between the set point and the value of the controlled variable. A. manipulated B. measured C. controlled D. disturbance
A. manipulated
The input to a controller than can be manually set, automatically set, or programmed to determine the desired value of the controlled variable is called the: A. measurement signal B. set point C. controlled variable D. output signal
B. set point
An undesired change in a variable which tends to adversely affect the value of a controlled variable, is normally called a(n) A. process lag B. measurement error C. disturbance D. error signal
C. disturbance
In a home heating system, the room temperature is the: A. manipulated variable B. setpoint C. controlled variable D. disturbance variable
C. controlled variable
The integral action which is part of a PID algorithm is often called: A. rate B. reset C. gain D. insert
B. reset
In instrumentation, the term “loop” usually defines:
A. a circle in the instrumentation signal lines to help minimize the effects of vibration
B. a circle in the instrument piping to reduce the water hammer
C. a combination of two or more inter-connected instruments
D. an internal RC filtering circuit to reduce electrical noise
C. a combination of two or more inter-connected instruments
The term "primary element" usually refers to: A. PID control action B. pneumatic control valves C. transmitters and transducers D. detectors or sensors
D. detectors or sensors
Most pneumatic controllers: A. produce a 6 to 30 PSIG output B. have some type of baffle nozzle C. are PID controllers D. can accept a 4 to 20 mA input
B. have some type of baffle nozzle
A pneumatic controller's output is a function of the spacing between a baffle and a nozzle. A change in the baffle / nozzle relationship produces an increase or decrease in back pressure that is sensed by the relay. This baffle / nozzle relationship is determined by: A. relay B. output signal C. input signal D. supply air signal
C. input signal
Dew point in an instrument air supply system is usually measured: A. after the air leaves the seperator B. after the air leaves the dryer C. before the air leaves the dryer D. before the air enters the receiver
B. after the air leaves the dryer
An analog multi-meter may be used to measure: A. frequency B. cycles C. voltage D. pressure
voltage
The time it takes for an instrument to produce a change in output in response to a change in input is called: A. reaction time B. dead time C. lead time D. deviation time
B. dead time
As the temperature of a liquid increases, it's density: A. increases B. double C. remains the same D. decreases
D. decreases
The level measurement installation (Fig 4-1) infers level by measuring: A. variable capacitance B. hydrostatic head C. positive displacement D. thermal condictivity
B. hydrostatic head
In a two stage phenomenon of liquid flow, the first stage is the formation of voids or cavities within the equipment system. The second stage is the collapse or implosion of these cavities back into an all-liquid state called: A. cavitation B. corrosion C. erosion D. flashing
A. cavitation
The most important function in safety belongs to: A. the safety professional B. the owner or president of the company C. supervisors D, OSHA
C. supervisors
A new feedback cam is required for a positioner. What specific documentation is required to change cam A to cam B in the positioner? A. Operation and maintenance manual B. Instrument index and instruction book C. Calibration procedures D. Positioner
A. Operation and maintenance manual
A representation of \_\_\_\_\_\_\_\_\_\_ flow is shown below (see photo). A. turbulent B. laminar C. erratic D. transition
B. laminar
The pneumatic control valve in this storage tank pressure control system: A. will fail open B. will fail locked C. will fail closed D. will never fail
A. will fail open
It is much easier to coordinate process controls and implement complex interactive control requirements with ________ than with other systems.
A. hard wired analog feedback systems
B. pneumatic control systems
C. hard wired logic function (relay) systems
D. digital control systems
D. digital control systems
\_\_\_\_\_\_\_\_\_ control is often used when a specific blend of two materials is required. A. Ratio B. Cascade C. Feedforward C. Feedback
A. Ratio
Which of the following requires no "power" source? A. Hydraulic load cell B. Bonded strain gauge C. Hydrostatic head transmitter D. Rotating paddle
A. Hydraulic load cell
Limit switch cams are usually found in: A. solenoid actuators B. diaphragm actuator C. piston actuators D. electric motor actuators
D. electric motor actuators
Which of the following types of actuators offers high thrust as a result of being able to use high air pressures? A. rolling diaphragm B. piston C. spring and diaphragm D. electromechanical
B. piston
What is the purpose of internal cache memory in a computer system?
A. store, temporarily, the results of each calculation
B. retain program instructions until they are used
C. speed up the performance of a CD-ROM drive
D. provide back-up memory for RAM
B. retain program instructions until they are used
In which register for a standard microprocessor is the result of arithmetical and logical operations stored? A. Accumulator B. Address C. General purpose D. Processor status
A. Accumulator
Which of the following does NOT apply to asynchronous serial transmission?
A. Data characters can be sent with any length of interval between them
B. Characters are framed by stop and start bits
C. Clocking and timing techniques are used for transmission
D. Message coding provides coordinates data transfer
C. Clocking and timing techniques are used for transmission
The status given to the parity bit for a selected parity mode is based on the number of ones in the:
A. bits in the data word, including parity
B. bits in the data word, parity, and the stop bit
C. bits of the data word
D. start bit and bits of the data word
bits of the data word
