Domain 2 / Loop Checking Flashcards
A typical process control loop component would be which of the following? A. Sensor B. Controller C. Final control device D. All of the above
D. All of the above
A diamond on an instrumentation diagram encloses information about: A. calibration B. the set point C. controller action D. the power source
B. the set point
Central connection points for signal lines are called: A. instrument ports B. junction boxes C. input/output junctions D. field ports
B. Junction boxes
In a pneumatic loop diagram, tube and bundle numbers:
A. appear in rectangles
B. are written on or near the signal line
C. appear in the notes section
D. are connected with a curved arrow to the signal line
B. are written on or near the signal line
In an electronic loop diagram, junction box connections are represented by: A. circles B. diamonds C. ellipses D. squares
D. squares
On an instrumentation diagram, the loop identification:
A. consists of two, three, or four letters
B. is the same for all instruments in a specific loop
C. identifies the measured or initiating variable
D. appears in the upper portion of the instrument balloon
B. is the same for all instruments in a specific loop
Process instrument connection lines are indicated on an instrumentation diagram by: A. bold solid lines B. fine solid lines C. bold broken lines D. fine broken lines
B. Fine solid lines
The thermostat for a central air conditioning system is set at 68 deg F. This value is an example of the: A. manipulated variable B. deviation C. set point D. controlled variable
C. set point
The statement: “Thermocouple extension wires must have the same thermoelectric properties as the thermocouple they are used with” is:
A. true, if the extension wires are submerged in the process fluid
B. true, in all installations
C. false. Extension wires must be made from either copper or brass
D. false. The type of extension wires makes no difference.
B. true, in all installations
To convert the output from a thermocouple to a standard 4 to 20 mA instrument signal, a(n) \_\_\_\_\_\_ with cold junction compensation would be used. A. I/P transducer B. P/I transducer C. D/A converter D. mV/I transducer
D. mV/I transducer
Iron constantan thermocouples are designated by the letter: A. T B. J C. B D. S
B. J
To change the 4 to 20 mA analog signal from a transmitter to the signal required by a digital controller, a(n) \_\_\_\_\_\_ must be a part of the instrument signal loop. A. I/P transducer B. signal conditioner C. D/P transmitter D. A/D converter
D. A/D converter
A device that changes a voltage signal to a current signal is normally referred to as a(n): A. P/I transducer B. E/I transducer C. D/P transmitter D. V/C converter
B. E/I transducer
A pneumatic control valve, without a positioner, is the final control element in an instrument loop. The transmitter and controller are both electronic. In order for this control system to operate, a(n) \_\_\_\_\_\_\_\_ must be installed in the instrument signal line between the controller and the control valve. A. I/P transducer B. mV/I transducer C. D/A converter D. P/I transducer
A. I/P transducer
The transmission signals considered standard for most instrument systems are: A. 4 to 20 PSI and 3 to 15mA B. 0 to 24 volts and 0 to 20 PSIG C. 3 to 15 PSIG and 4 to 20 mA D. 0 to 20 mA and 0 to 15 PSIG
C. 3 to 15 PSIG and 4 to 20 mA
A process is \_\_\_\_\_\_\_\_\_\_ if heat is produced by a reaction. A. endothermic B. continuous C. intermittent D. exothermic
D. exothermic
A process is \_\_\_\_\_\_\_\_\_\_ if heat input is required to produce a reaction. A. endothermic B. continuous C. intermittent D. exothermic
A. endothermic
in most process control systems the final control element is a: A. transmitter B. sensor C. controller D. valve
D. valve
A control valve with a direct acting actuator and is air to close will: A. fail closed B. maintain position C. fail open D. fail indeterminate
C. fail open
A pneumatic valve actuator that operates over an instrument signal range of 9 - 15 PSI is referred to as: A. split range B. fail safe C. air to close D. full range
A. split range
One significant advantage of a single loop / stand alone digital controllers is:
A. flexibility of configuration
B. 4 to 20mA input
C. internal I/P and P/I transducers
D. immunity to electrical surges and lightning strikes
A. flexibility of configuration
Hydrostatic head level cannot be measured with a: A. dP cell B. resistance probe C. dip pipe D. pressure gauge
B. resistance probe
RTD is short for: A. Reactive Tuning Deviation B. Resistance Temperature Detector C. Resistance Tone Dampening D. Resonant Temperature Device
B. Resistance Temperature Detector
What is a device that changes a voltage signal to a current signal? A. P/I transducer B. E/I transducer C. D/P transmitter D. V/C converter
B. E/I transducer
While increasing the pressure during a performance test, if you overshoot the specified test point by a small margin, you should:
A. take the reading at the pressure you have reached
B. reduce the pressure gradually to the test point value
C. reduce pressure to zero and start again
D. reduce the pressure to below test point and increase it again until the test point is reached
D. reduce the pressure to below test point and increase it again until the test point is reached.
The relationship between the thermocouples and thermopiles is:
A. thermocouples consist of two or more thermopiles
B. thermopiles consist of two or more thermocouples
C. thermocouples only measure heat conductivity
D. thermopile is another name for a thermocouple
B. Thermopiles consist of two or more thermocouples
This function symbol from ISA-5.1-1984 (R1992) -- "Instrument Symbols and Identification indicates a field mounted: A. programmable logic controller B. computer function C. shared display, shared control D. discrete instrument
D. discrete instrument
Which of the following symbols from ISA-5.1-1984 (R1992) – “Instrument Symbols and Identification” is used to indicate a pressure balanced diaphragm actuator?
(see photo)
D.
In the drawing (Fig. 2-1, page 35), LIC 900 is a(n):
A. shared flow controller with high / low alarms
B. shared display indicating level controller
C. discrete flow controller
D. pneumatic shared indicating controller
B. shared display indicating level controller
The control system for this steam drum (see photo) is: A. feedback feedwater control B. single element feedwater control C. two element feedwater control D. three element feedwater control
D. three element feedwater control
In this "bubbler" level control application, FI-1: (see photo) A. sets LIC-1 setpoint B. controls purge gas flow C. controls gas pressure D. indicates purge gas flow
D. indicates purge gas flow
This tower feed flow control (see photo)would not work well as part of an interactive control system because it:
A. is a pneumatic loop
B. is not connected to the level transmitter, LT-1
C. does not have square root extraction
D. is dependent on the level in D-1
C. does not have square root extraction
Which of the following types of actuators responds to a pneumatic signal? A. Solenoid B. Motor C. Diaphragm D. Electromagnetic valve
C. diaphragm
Changing the point of origin for input data, and the output signal destination is easy with a Distributed Control System because many changes can be implemented by:
A. relocating wire jumpers in a junction box
B. changing the pneumatic tubing connections
C. reassigning inputs / outputs by changing loop configuration
D. installing new transmitters and final control elements
C. reassigning inputs / outputs by changing loop configuration
