Question 1

What is a possible equipment impact of adjusting leaking control valve packing?&#10;A) Shutdown of process unit&#10;B) Damage to motor&#10;C) Valve may not open, close, or operate properly&#10;D) Possible damage to downstream equipment due to higher flows and pressures

Accepted Answer

A) Incorrect. Adjusting leaking control valve packing may cause the valve to not open, close, or operate properly.
B) Incorrect. Adjusting leaking control valve packing may cause the valve to not open, close, or operate properly.
C) Correct. Adjusting leaking control valve packing may cause the valve to not open, close, or operate properly.
D) Incorrect. Adjusting leaking control valve packing may cause the valve to not open, close, or operate properly.

Question 2

What is a measurement of the chemical or physical properties of a substance?&#10;A) Remote&#10;B) Process variable&#10;C) Analytical variable&#10;D) Transducer

Accepted Answer

A) Incorrect. A remote is instrumentation that is located away from the process (e.g., in a control room) and is controlled by the DCS or other panel board mounted controller.
B) Incorrect. A process variable is a varying operational condition that is associated with a processing operation such as temperature, pressure, flow rate, level, and composition.
C) Correct. An analytical variable is a measurement of the chemical or physical properties of a substance.
D) Incorrect. A transducer is the control loop component that converts one instrumentation signal type to another type (e.g., electronic to pneumatic).

Question 3

Which of the following is an instrument used to document variables such as pressure, speed, flow, temperature, level, and electrical units?&#10;A) Sensor&#10;B) Indicator&#10;C) Recorder&#10;D) Controller

Accepted Answer

A) Incorrect. A sensor is an element in direct contact with the process variable to be measured that senses a change and provides a signal to the transmitter.
B) Incorrect. An indicator shows the current condition of a process variable, usually through a visual representation such as a needle on a scale in a gauge or a digital readout.
C) Correct. A recorder is an instrument used to document variables such as pressure, speed, flow, temperature, level, and electrical units.
D) Incorrect. The controller receives information from the transmitter in the form of a pneumatic or electronic signal, compares that input signal to the reference set point, and sends a corrective output signal to the final control element, typically a control valve.

Question 4

Which of the following is a common flow-sensing element that creates a difference in pressure that can be measured by a D/P cell?&#10;A) Rotating piston&#10;B) Oval gear&#10;C) Orifice plates&#10;D) Rotating vane meters

Accepted Answer

A) Incorrect. Some common instruments used to measure flow by positive displacement are the rotating piston, nutating disk, oval gear, and rotating vane meters.
B) Incorrect. Some common instruments used to measure flow by positive displacement are the rotating piston, nutating disk, oval gear, and rotating vane meters.
C) Correct. Common flow-sensing elements that create a difference in pressure that can be measured by a D/P cell include pitot tubes (Figure 27.4), orifice plates, flow nozzles, flow tubes, and Venturi tubes.
D) Incorrect. Some common instruments used to measure flow by positive displacement are the rotating piston, nutating disk, oval gear, and rotating vane meters.

Question 5

What is the difference between the set point and the current process variable value called?&#10;A) Error&#10;B) Excess&#10;C) Oversight&#10;D) Set point

Accepted Answer

A) Correct. The difference between the set point and the current process variable value is called the error.
B) Incorrect. The difference between the set point and the current process variable value is called the error.
C) Incorrect. The difference between the set point and the current process variable value is called the error.
D) Incorrect. The difference between the set point and the current process variable value is called the error.

Question 6

What component of process control instrumentation systems converts one instrumentation signal type into another type?&#10;A) Alarm&#10;B) Control valve&#10;C) Transducer&#10;D) Valve positioner

Accepted Answer

A) Incorrect. An alarm is an instrumentation that provides visual and/or audible cues that alert technicians of a condition outside the normal operating range, such as a tank reaching capacity.
B) Incorrect. A control valve is the final component of a control loop, operated either remotely or by hand, that receives its signal from the controller and manipulates the process variable in response to a system disturbance or change.
C) Correct. A transducer converts one instrumentation signal type into another type.
D) Incorrect. A valve positioner is a device that ensures a valve is positioned properly in reference to the signal received from the controller.

Question 7

What is a varying operational condition that is associated with a processing operation such as temperature, pressure, flow rate, level, and composition?&#10;A) Remote&#10;B) Process variable&#10;C) Analytical variable&#10;D) Transducer

Accepted Answer

A) Incorrect. A remote is instrumentation that is located away from the process (e.g., in a control room) and is controlled by the DCS or other panel board mounted controller.
B) Correct. A process variable is a varying operational condition that is associated with a processing operation such as temperature, pressure, flow rate, level, and composition.
C) Incorrect. An analytical variable is a measurement of the chemical or physical properties of a substance.
D) Incorrect. A transducer is the control loop component that converts one instrumentation signal type to another type (e.g., electronic to pneumatic).

Question 8

What system uses light frequency signals and is gaining popularity in industry use?&#10;A) Fiber optics&#10;B) Pneumatic signals&#10;C) Compression signals&#10;D) Hydraulic signals

Accepted Answer

A) Correct. Fiber optics, a system that uses light frequency signals in either analog or digital mode, have gained popularity in industry use.
B) Incorrect. Fiber optics, a system that uses light frequency signals in either analog or digital mode, have gained popularity in industry use.
C) Incorrect. Fiber optics, a system that uses light frequency signals in either analog or digital mode, have gained popularity in industry use.
D) Incorrect. Fiber optics, a system that uses light frequency signals in either analog or digital mode, have gained popularity in industry use.

Question 9

What is the most common pressure measurement found in the US process industry?&#10;A) Differential pressure (psid)&#10;B) Pounds per square inch (psi)&#10;C) Inches of mercury (inHg)&#10;D) Pounds per square inch absolute (psia)

Accepted Answer

A) Incorrect. Differential pressure is the difference between measurements taken from two separate points in a process unit.
B) Correct. Pounds per square inch (psi) is the most common measurement found in industry.
C) Incorrect. Pounds per square inch (psi) is the most common measurement found in industry.
D) Incorrect. Pounds per square inch absolute (psia) is a pressure measurement referenced to a vacuum.

Question 10

What is the main signal for process instrumentation lines and control loop instruments?&#10;A) Hydroelectric power&#10;B) Electricity&#10;C) Solar power&#10;D) Pneumatic power

Accepted Answer

A) Incorrect. Pneumatic power is the main signal for process instrumentation lines and control loop instruments.
B) Incorrect. Pneumatic power is the main signal for process instrumentation lines and control loop instruments.
C) Incorrect. Pneumatic power is the main signal for process instrumentation lines and control loop instruments.
D) Correct. Pneumatic power is the main signal for process instrumentation lines and control loop instruments.

Question 11

What type of control element can only be on or off?&#10;A) Discrete&#10;B) Modulated&#10;C) Valve control&#10;D) Continuous

Accepted Answer

The answer of What type of control element can only...

Question 12

What type of signal is a continuously variable representation of a process variable?&#10;A) Analog signal&#10;B) Process signal&#10;C) Digital signal&#10;D) Automatic signal

Accepted Answer

The answer of What type of signal is a continuously...

Question 13

Which of the following is an element in direct contact with the process variable to be measured that senses a change and provides a signal to the transmitter?&#10;A) Sensor&#10;B) Indicator&#10;C) Recorder&#10;D) Controller

Accepted Answer

The answer of Which of the following is an element...

Question 14

Which of the following improper operations could most likely lead to hand and/or back injuries?&#10;A) Bypassing alarms&#10;B) Failure to respond to an alarm&#10;C) Adjusting leaking control valve packing&#10;D) Attempting to open a motor controlled valve manually

Accepted Answer

The answer of Which of the following improper operations could...

Question 15

Which of the following improper operations will not cause equipment shutdown?&#10;A) Bypassing alarms&#10;B) Failure to respond to an alarm&#10;C) Partially opening a bypass valve around a working control valve&#10;D) Turning off air supplies to control devices

Accepted Answer

The answer of Which of the following improper operations will...

Question 16

Which of the following is an example of instrumentation that could be programmed to begin each step in the process upon completion of the previous one?&#10;A) Filter backwash&#10;B) Dryer regeneration&#10;C) Regeneration of a catalyst bed&#10;D) All of the above

Accepted Answer

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Question 17

Which of the following is a temperature-sensing instrument?&#10;A) Thermistors&#10;B) Manometers&#10;C) Radar gauges&#10;D) All of the above

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The answer of Which of the following is a temperature-sensing...

Question 18

What uses air pressure, or a gas such as nitrogen, as a power source traveling through copper or stainless tubes?&#10;A) Analog signal&#10;B) Digital signal&#10;C) Hydraulic instruments&#10;D) Pneumatic instruments

Accepted Answer

The answer of What uses air pressure, or a gas...

Question 19

What common component of a DCS system is a data highway that connects the systems?&#10;A) Network&#10;B) Workstations&#10;C) Central processor&#10;D) Supervisory computers

Accepted Answer

The answer of What common component of a DCS system...

Question 20

What common component of a DCS system are computers accessed by engineers and management at the programming level to monitor production targets?&#10;A) Network&#10;B) Workstations&#10;C) Central processor&#10;D) Supervisory computers

Accepted Answer

The answer of What common component of a DCS system...

Question 21

Which of the following is a symbol for remotely mounted instrumentation?&#10;A)  &#10;B)  &#10;C)  &#10;D)

Accepted Answer

The answer of Which of the following is a symbol...

Question 22

Which of the following is the symbol for a hydraulic signal?&#10;A)  &#10;B)  &#10;C)  &#10;D)

Accepted Answer

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Question 23

Which of the following is the symbol for a pneumatic signal?&#10;A)  &#10;B)  &#10;C)  &#10;D)

Accepted Answer

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Question 24

Which of the following is a symbol for panel mounted instrumentation?&#10;A)  &#10;B)  &#10;C)  &#10;D)

Accepted Answer

The answer of Which of the following is a symbol...

Deck 27: Instrumentation