HEMISPHERES 3.0 LEVEL VII DISCHARGE &
PREVENTION EXAM QUESTIONS WITH
CORRECT ANSWERS
1. What is indicated by 1/4 wave damping in control systems?
Optimum proportional band setting
Decaying control
Improper gain setting
Sizing the capacity tanks properly
2. What are the two types of signals involved in wavelength signal analysis?
Only measurement wavelength signal
Only reference wavelength signal
Measurement wavelength signal more than reference wavelength
signal
Measurement wavelength signal and reference wavelength signal
3. What is one of the primary functions of a knockout pot in a control system?
Removes bubbles from the process sample
Introduces a time lag into the system
Increases the pressure of the process sample
Cools an overhead process sample
4. Describe how controller action contributes to the safety of a process in
control systems.
,Controller action only regulates the flow of materials in the
process.
Controller action is irrelevant to safety in control systems.
, Controller action ensures that the system can respond
appropriately to faults, maintaining safe operating conditions.
Controller action primarily focuses on energy efficiency.
5. What is the first step to take before tuning a three mode controller?
Bring process up to set point on manual, set P.B. wide, eliminate
reset effect and derivative effect
Need to acquire special set up tools
Turn all setting to zero
Switch to automatic and create an upset in the process and study
the effect of the upset on the process
6. Interpret the significance of a stable output in relation to an oscillating
input when the controller is set to manual mode.
It implies that the auto manual switch is defective.
It suggests that the controller is functioning correctly and not
contributing to the input oscillations.
It indicates that the valve is malfunctioning and needs to be
checked.
It shows that the controller itself is faulty.
7. Describe the principle behind how a paramagnetic sensor measures
oxygen concentration.
A paramagnetic sensor measures oxygen concentration by
detecting changes in a magnetic field caused by the presence of
oxygen molecules.
A paramagnetic sensor measures temperature changes to infer
oxygen levels.
A paramagnetic sensor relies on galvanic cells to determine oxygen
concentration.
, A paramagnetic sensor uses electrochemical reactions to measure
oxygen levels.
8. What is the function of a bleed valve in a pH or ORP probe installation?
Measures the pressure of the sample liquid
Filters impurities from the sample liquid
Controls the temperature of the sample liquid
Regulates the flow rate of the sample liquid
9. What is the equivalent time for a reset adjustment of 10 repeats per minute?
0.5 minutes per repeat
0.1 minutes per repeat
0.2 minutes per repeat
1.0 minutes per repeat
10. What does it indicate if the output stabilizes while the input oscillates with
the controller in manual mode?
The controller is probably not the cause of the problem
There is a problem with the controller
The valve is the problem
The auto manual switch is faulty
11. In a scenario where a control system experiences a sensor failure, which
controller action would be most effective in maintaining safe operations?
Changing the valve operation to manual control.
Implementing a fail-safe controller action that defaults to a safe
state.
PREVENTION EXAM QUESTIONS WITH
CORRECT ANSWERS
1. What is indicated by 1/4 wave damping in control systems?
Optimum proportional band setting
Decaying control
Improper gain setting
Sizing the capacity tanks properly
2. What are the two types of signals involved in wavelength signal analysis?
Only measurement wavelength signal
Only reference wavelength signal
Measurement wavelength signal more than reference wavelength
signal
Measurement wavelength signal and reference wavelength signal
3. What is one of the primary functions of a knockout pot in a control system?
Removes bubbles from the process sample
Introduces a time lag into the system
Increases the pressure of the process sample
Cools an overhead process sample
4. Describe how controller action contributes to the safety of a process in
control systems.
,Controller action only regulates the flow of materials in the
process.
Controller action is irrelevant to safety in control systems.
, Controller action ensures that the system can respond
appropriately to faults, maintaining safe operating conditions.
Controller action primarily focuses on energy efficiency.
5. What is the first step to take before tuning a three mode controller?
Bring process up to set point on manual, set P.B. wide, eliminate
reset effect and derivative effect
Need to acquire special set up tools
Turn all setting to zero
Switch to automatic and create an upset in the process and study
the effect of the upset on the process
6. Interpret the significance of a stable output in relation to an oscillating
input when the controller is set to manual mode.
It implies that the auto manual switch is defective.
It suggests that the controller is functioning correctly and not
contributing to the input oscillations.
It indicates that the valve is malfunctioning and needs to be
checked.
It shows that the controller itself is faulty.
7. Describe the principle behind how a paramagnetic sensor measures
oxygen concentration.
A paramagnetic sensor measures oxygen concentration by
detecting changes in a magnetic field caused by the presence of
oxygen molecules.
A paramagnetic sensor measures temperature changes to infer
oxygen levels.
A paramagnetic sensor relies on galvanic cells to determine oxygen
concentration.
, A paramagnetic sensor uses electrochemical reactions to measure
oxygen levels.
8. What is the function of a bleed valve in a pH or ORP probe installation?
Measures the pressure of the sample liquid
Filters impurities from the sample liquid
Controls the temperature of the sample liquid
Regulates the flow rate of the sample liquid
9. What is the equivalent time for a reset adjustment of 10 repeats per minute?
0.5 minutes per repeat
0.1 minutes per repeat
0.2 minutes per repeat
1.0 minutes per repeat
10. What does it indicate if the output stabilizes while the input oscillates with
the controller in manual mode?
The controller is probably not the cause of the problem
There is a problem with the controller
The valve is the problem
The auto manual switch is faulty
11. In a scenario where a control system experiences a sensor failure, which
controller action would be most effective in maintaining safe operations?
Changing the valve operation to manual control.
Implementing a fail-safe controller action that defaults to a safe
state.
