Page 1 of 170
Qualification Instrumentation and Control
Technician (447A) Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf.
Q1. What is the principle of operation of a bullseye level gauge
when used on a steam boiler application?
A) Conductivity of water
B) Voltage change of a thermocouple
C) Differing refractive indexes of steam and water
D) Resistance change of an RTD
Correct Answer: C
,Page 2 of 170
Rationale: In a bullseye level gauge, light passes differently
through steam vs. water due to their different refractive indices.
The water appears dark while steam appears light, allowing
visual level indication. This is a fundamental principle of physical
optics applied to industrial level measurement .
Q2. After installing a new smart valve positioner, the valve does
not respond to process changes. What is a possible cause?
A) Positioner in auto mode
B) Improper actuator bench set
C) Controller in manual mode
D) Air supply set at 100 kPa
Correct Answer: C
Rationale: If the controller is in manual mode, it will not send
variable output signals to the positioner regardless of process
,Page 3 of 170
changes. The positioner can only respond if the controller is in
automatic mode. This is a common troubleshooting oversight .
Q3. Which procedure is required when terminating a 4-20 mA,
2-wire RTD transmitter in an intrinsically safe (I.S.) barrier panel
in the control room?
A) Connect the red lead to ground and the blue lead to the
positive (+) point of the barrier
B) Connect wires to positive (+) and negative (-) points of the
active barrier only, leaving the shield open
C) Connect wires to positive (+) and negative (-) points of the
active barrier and run a bonding jumper from negative (-) to
ground
D) Connect the shield to barrier ground and signal wires to
respective positive (+) and negative (-) points of the active
barrier
, Page 4 of 170
Correct Answer: D
Rationale: Proper I.S. barrier termination requires the shield to
be grounded at the barrier panel to prevent noise, while signal
wires connect to the designated terminals. This ensures intrinsic
safety integrity and proper signal transmission .
Q4. A technician is calibrating a pressure transmitter with a
range of 0-100 psi and an output of 4-20 mA. At 0 psi, the
output is 4.1 mA. This error is called:
A) Hysteresis
B) Zero error
C) Span error
D) Linearity error
Correct Answer: B
Qualification Instrumentation and Control
Technician (447A) Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf.
Q1. What is the principle of operation of a bullseye level gauge
when used on a steam boiler application?
A) Conductivity of water
B) Voltage change of a thermocouple
C) Differing refractive indexes of steam and water
D) Resistance change of an RTD
Correct Answer: C
,Page 2 of 170
Rationale: In a bullseye level gauge, light passes differently
through steam vs. water due to their different refractive indices.
The water appears dark while steam appears light, allowing
visual level indication. This is a fundamental principle of physical
optics applied to industrial level measurement .
Q2. After installing a new smart valve positioner, the valve does
not respond to process changes. What is a possible cause?
A) Positioner in auto mode
B) Improper actuator bench set
C) Controller in manual mode
D) Air supply set at 100 kPa
Correct Answer: C
Rationale: If the controller is in manual mode, it will not send
variable output signals to the positioner regardless of process
,Page 3 of 170
changes. The positioner can only respond if the controller is in
automatic mode. This is a common troubleshooting oversight .
Q3. Which procedure is required when terminating a 4-20 mA,
2-wire RTD transmitter in an intrinsically safe (I.S.) barrier panel
in the control room?
A) Connect the red lead to ground and the blue lead to the
positive (+) point of the barrier
B) Connect wires to positive (+) and negative (-) points of the
active barrier only, leaving the shield open
C) Connect wires to positive (+) and negative (-) points of the
active barrier and run a bonding jumper from negative (-) to
ground
D) Connect the shield to barrier ground and signal wires to
respective positive (+) and negative (-) points of the active
barrier
, Page 4 of 170
Correct Answer: D
Rationale: Proper I.S. barrier termination requires the shield to
be grounded at the barrier panel to prevent noise, while signal
wires connect to the designated terminals. This ensures intrinsic
safety integrity and proper signal transmission .
Q4. A technician is calibrating a pressure transmitter with a
range of 0-100 psi and an output of 4-20 mA. At 0 psi, the
output is 4.1 mA. This error is called:
A) Hysteresis
B) Zero error
C) Span error
D) Linearity error
Correct Answer: B
