Domain 4 / Start-Up Flashcards
1
Q
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
A. manipulated
2
Q
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
A
B. set point
3
Q
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
A
C. disturbance
4
Q
In a home heating system, the room temperature is the: A. manipulated variable B. setpoint C. controlled variable D. disturbance variable
A
C. controlled variable
5
Q
The integral action which is part of a PID algorithm is often called: A. rate B. reset C. gain D. insert
A
B. reset
6
Q
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
A
C. a combination of two or more inter-connected instruments
7
Q
The term "primary element" usually refers to: A. PID control action B. pneumatic control valves C. transmitters and transducers D. detectors or sensors
A
D. detectors or sensors
8
Q
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
A
B. have some type of baffle nozzle
9
Q
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
A
C. input signal
10
Q
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
A
B. after the air leaves the dryer
11
Q
An analog multi-meter may be used to measure: A. frequency B. cycles C. voltage D. pressure
A
voltage
12
Q
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
A
B. dead time
13
Q
As the temperature of a liquid increases, it's density: A. increases B. double C. remains the same D. decreases
A
D. decreases
14
Q
The level measurement installation (Fig 4-1) infers level by measuring: A. variable capacitance B. hydrostatic head C. positive displacement D. thermal condictivity
A
B. hydrostatic head
15
Q
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
A. cavitation
