Study Prep For EPRI Test – Questions & Verified
Answers
~Describe general electrical/electronic theories.
~Comprehend workplace safety processes.
~Calculate electrical/electronic circuit performance (Ohm's Law).
~Identify electrical/electronic symbols.
~Discuss Lockout-Tagout procedures.
What is the maximum allowed deviation (in mADC) for a device that has an
accuracy requirement of 0.5% and an output span of 16 mADC? Correct
Ans - 0.08 mADC
Deviation=Span X (Accuracy/100)
What procedure should be enacted before working on an electrical or
pneumatic system? Correct Ans - Lockout/Tagout
What is the total resistance of a parallel circuit with resistances of 25, 35,
and 45 ohms? Correct Ans - 11 ohms
Who is authorized to remove each lock and tag applied? Correct Ans -
Only the technician who applied the lock
What should an instrument technician evaluate before opening a process
line? Correct Ans - The SDSs for the chemicals in the line
What is the proper ratio of rise to run for an extension ladder? Correct
Ans - 4:1
Find the volume of a tank with a diameter of 12 feet and a height of 37 feet.
Correct Ans - 4,183.8 cu. ft.
V = (3.14) (R^2) (H)
Find the DC voltage drop across a 250-ohm resistor with a current of 16
milliamperes DC. Correct Ans - 4 VDC
E=IxR
Convert 4,500 cubic feet to gallons. Correct Ans - 33,662.25 gallons
,Gallons = (CuFt) (7.48)
What does not determine the severity of an electrical shock? Correct
Ans - Temperature
This vocabulary term is defined as "a system in which deliberate guidance
or manipulation is used to achieve a prescribed value or variable."
Correct Ans - Control System
Where in the physical process would a primary element be located?
Correct Ans - In contact with the process
Automatic control systems relieve the operator of the responsibility to
maintain a process.
True or False? Correct Ans - True
Process variables in a system requiring control include which of the
following?
Density
Flow
Specific Gravity
Volume Correct Ans - Flow
How are inputs and outputs typically connected to the controller in a
process system? Correct Ans - Twisted-pair wiring
What type of signal is represented by a packet of information containing a
series of discrete bits? Correct Ans - Digital
What type of signal can be used as inputs to record a range of values and as
outputs to position a final control element? Correct Ans - Analog
What is a Process? Correct Ans - A system being measured and
controlled.
A control valve is considered to be which element in a process? Correct
Ans - Final control element
, A control loop that uses float switches to turn a pump on and off is referred
to as which type of control? Correct Ans - Discrete
What do symbols portrayed on diagrams and drawings depict? Correct
Ans - Instruments
What is the name of the unique identification code for devices shown on
instrumentation drawings and diagrams? Correct Ans - Tag number
What is a device that is identified as TT 1004? Correct Ans -
Temperature transmitter 1004
What is a device that is identified as PSL 2345? Correct Ans -
Pressure switch low 2345
What does the tag number LAL 1003 represent? Correct Ans - Level
alarm low
What type of drawing shows all related (loop number) devices for
controlling means and the wiring path, termination point, and device
locations? Correct Ans - Loop Sheet
What time of document indicates the specifics for which device is ordered
and the type of conditions under which is must perform? Correct Ans -
Spec Sheet
How are devices that are hidden from the operator's view indicated?
Correct Ans - Series of dashed lines within the tag number
A control valve that fails in position and does not move can be indicated
with a graphic symbol or which letters? Correct Ans - FL (Fail Last)
A relatively quick way to determine the quantity of a specific type of device
needed on a project would be to consult which documentation? Correct
Ans - Instrument index sheets
What is the accuracy of a transmitter that has a maximum deviation of 0.18
milliampere and an output span of 16 mADC? Correct Ans - 1.13%
Accuracy=(MaxDev/Span) X 100
Answers
~Describe general electrical/electronic theories.
~Comprehend workplace safety processes.
~Calculate electrical/electronic circuit performance (Ohm's Law).
~Identify electrical/electronic symbols.
~Discuss Lockout-Tagout procedures.
What is the maximum allowed deviation (in mADC) for a device that has an
accuracy requirement of 0.5% and an output span of 16 mADC? Correct
Ans - 0.08 mADC
Deviation=Span X (Accuracy/100)
What procedure should be enacted before working on an electrical or
pneumatic system? Correct Ans - Lockout/Tagout
What is the total resistance of a parallel circuit with resistances of 25, 35,
and 45 ohms? Correct Ans - 11 ohms
Who is authorized to remove each lock and tag applied? Correct Ans -
Only the technician who applied the lock
What should an instrument technician evaluate before opening a process
line? Correct Ans - The SDSs for the chemicals in the line
What is the proper ratio of rise to run for an extension ladder? Correct
Ans - 4:1
Find the volume of a tank with a diameter of 12 feet and a height of 37 feet.
Correct Ans - 4,183.8 cu. ft.
V = (3.14) (R^2) (H)
Find the DC voltage drop across a 250-ohm resistor with a current of 16
milliamperes DC. Correct Ans - 4 VDC
E=IxR
Convert 4,500 cubic feet to gallons. Correct Ans - 33,662.25 gallons
,Gallons = (CuFt) (7.48)
What does not determine the severity of an electrical shock? Correct
Ans - Temperature
This vocabulary term is defined as "a system in which deliberate guidance
or manipulation is used to achieve a prescribed value or variable."
Correct Ans - Control System
Where in the physical process would a primary element be located?
Correct Ans - In contact with the process
Automatic control systems relieve the operator of the responsibility to
maintain a process.
True or False? Correct Ans - True
Process variables in a system requiring control include which of the
following?
Density
Flow
Specific Gravity
Volume Correct Ans - Flow
How are inputs and outputs typically connected to the controller in a
process system? Correct Ans - Twisted-pair wiring
What type of signal is represented by a packet of information containing a
series of discrete bits? Correct Ans - Digital
What type of signal can be used as inputs to record a range of values and as
outputs to position a final control element? Correct Ans - Analog
What is a Process? Correct Ans - A system being measured and
controlled.
A control valve is considered to be which element in a process? Correct
Ans - Final control element
, A control loop that uses float switches to turn a pump on and off is referred
to as which type of control? Correct Ans - Discrete
What do symbols portrayed on diagrams and drawings depict? Correct
Ans - Instruments
What is the name of the unique identification code for devices shown on
instrumentation drawings and diagrams? Correct Ans - Tag number
What is a device that is identified as TT 1004? Correct Ans -
Temperature transmitter 1004
What is a device that is identified as PSL 2345? Correct Ans -
Pressure switch low 2345
What does the tag number LAL 1003 represent? Correct Ans - Level
alarm low
What type of drawing shows all related (loop number) devices for
controlling means and the wiring path, termination point, and device
locations? Correct Ans - Loop Sheet
What time of document indicates the specifics for which device is ordered
and the type of conditions under which is must perform? Correct Ans -
Spec Sheet
How are devices that are hidden from the operator's view indicated?
Correct Ans - Series of dashed lines within the tag number
A control valve that fails in position and does not move can be indicated
with a graphic symbol or which letters? Correct Ans - FL (Fail Last)
A relatively quick way to determine the quantity of a specific type of device
needed on a project would be to consult which documentation? Correct
Ans - Instrument index sheets
What is the accuracy of a transmitter that has a maximum deviation of 0.18
milliampere and an output span of 16 mADC? Correct Ans - 1.13%
Accuracy=(MaxDev/Span) X 100
