A typical location for an I/P transducer in an electronic control loop would be

between the controller and the control valve

After obtaining permits, which steps are taken to replace components on an alarm/shutdown panel?

Notify operations, use anti-static strap, isolate.

Replaced a speed-sensing probe, why is a reading of 60 Hz shown on the output signal of an induction-type speed sensor?

The shielding has not been properly grounded.

What change occurs in a medium when the pH increases from 3 to 4?

It becomes 10 times more basic.

Absolute pressure can best be described as

The sum of gauge pressure and atmospheric pressure

Interface level transmitter output is

20 mA when tank is fully filled with heavier fluid

When removing a 48 V DC explosion-proof instrument from service, which procedure ensures equipment and personal safety?

Inform operations, isolate from process, open breaker, lockout and tag.

Which of the following is applicable for Rotameter type flowmeter?

DP is constant and flow passage area is variable

Which transducers are used to measure displacement or motion?

LVDTs, piezoelectric, and variable resistance.

Which of the following is a common first step in an alarm management program?

By developing an alarm philosophy

What is the purpose of the battery back up in PLC?

To maintain the contents of the RAM upon loss of power

What are the three main phases of the industrial control system's Cybersecurity Lifecycle?

Assess, Develop & Implement, Maintain

Bench set is a term associated with

Spring-opposed diaphragm actuated valves

Cascade control has the following

Two processes, two transmitters, one valve, two controllers

An instrument location plan shows the _______ of each instrument

location, elevation, and tag number

In logical analysis troubleshooting, which step comes immediately after the first step: Identify and define the problem?

Gather information about the problem.

Ideally, a control system is grounded

at a single location near the control room or panel

A nuclear density meter on an oil pipeline is showing erratic output. What is the fault?

The scintillation counter is defective.

Valve packing selection is based on

The operating properties of the process

Where must the intrinsically safe (I.S) barrier be installed when supplying a device in a Class 1, Zone 2 area?

A safe area with an isolated ground.

The purpose of an intrinsic safety barrier is to

prevent excess voltage or current from reaching the hazardous area

studbud

Redseal Exam Practice

72 termsStudBud Administration49 plays

Imported from external platform

Flashcards72 cardsFPractice quizPHost liveL

Questions 72

Answers

1
Valves cause some flow loss due to friction even when fully open. Which type of valve causes the greatest flow loss?
swing check valve
globe
plug valve
gate
2
What are the parameters for calibrating a liquid turbine flowmeter?
Universal viscosity curve.
Strouhal number and Reynolds number.
K-factor and frequency.
K-factor and Reynolds number.
3
A typical location for an I/P transducer in an electronic control loop would be
between the controller and the control valve
at the measurement point in the process
between the sensor and controller
at the control point in the process
4
If the voltage remains constant and the resistance increases, what will the current do?
Stay the same
Double the current
Decrease current
Increase current
5
After obtaining permits, which steps are taken to replace components on an alarm/shutdown panel?
Isolate, power-down panel, use anti-static strap.
Notify operations, use anti-static strap, isolate.
Notify supervisor, use anti-static strap, isolate.
Disconnect component, use anti-static strap, install new one.
6
What happens when the heat is applied to the joined ends of the wires of a thermocouple?
The wires contract
The wires separate
A small voltage is generated
The wires start to rotate
7
Replaced a speed-sensing probe, why is a reading of 60 Hz shown on the output signal of an induction-type speed sensor?
The polarity is reversed.
The terminals are corroded.
The shielding has not been properly grounded.
The sensor is out of alignment.
8
What change occurs in a medium when the pH increases from 3 to 4?
It becomes 10 times more acidic.
It becomes 100 times more acidic.
It becomes 10 times more basic.
It becomes 100 times more basic.
9
Absolute pressure can best be described as
The minimum blood pressure in the artery
The maximum blood pressure in the artery
The sum of gauge pressure and atmospheric pressure
The pressure relative to atmospheric pressure
10
Interface level transmitter output is
20 mA when tank is fully filled with heavier fluid
12mA when tank is filled 50% physically
20 mA when tank is fully filled with lighter fluid
4mA when tank is fully filled with heavier fluid
11
When removing a 48 V DC explosion-proof instrument from service, which procedure ensures equipment and personal safety?
Inform operations, isolate from process, open breaker, lockout and tag.
Lockout and tag, isolate from process, open breaker, inform operations.
Inform operations, lockout and tag, open breaker, isolate from process.
Lockout and tag, inform operations, open breaker, isolate from process.
12
To minimize electrical interference when AC power and DC signal wiring meet in a control panel, it is BEST to
Use a different size wire
Run the wires parallel to each other
Cross the wires at 90 degrees
Twist AC wires around the DC wires
13
An enclosure made of _______ is best for shielding against EMI.
PCV
Fiber glass
Ferrous metal
No enclosure can shield against EMI
14
The term valve trim refers to
The accessories mounted on the valve
the stem, plug and seat
the control valve color
the orientation of the actuator on the body
15
Pressure switches open or close their contacts in reaction to pressure and can have __________ as measurement devices.
Bourdon tubes or bellows
Flow tubes or bellows
Flow tubes or vacuum tubes
Bourdon tubes or vacuum tubes
16
What is the recommended number of alarm priorities?
7
5
3
1
17
Which of the following is one of the causes of noise in instrumentation?
Frequency
Ground loop
Shielding
Calibration
18
After installing a new smart valve positioner, the valve does not respond to process changes. What is a possible cause?
Controller is in manual mode.
Air supply is set at 100kPa.
Positioner is in auto mode.
Improper actuator bench set.
19
Which of the following is applicable for Rotameter type flowmeter?
DP is irrelevant and flow passage area is constant
DP is variable and flow passage area is constant
DP is variable and flow passage area is variable
DP is constant and flow passage area is variable
20
Which transducers are used to measure displacement or motion?
Variable resistance, and thermoelectric.
Thermoelectric, LVDTs, and sonic.
LVDTs, variable resistance, and thermoelectric.
LVDTs, piezoelectric, and variable resistance.
21
Which of the following is a common first step in an alarm management program?
By rationalizing all alarms
By developing an alarm philosophy
By increasing all alarm deadbands
By prioritizing all alarms
22
Following is true for controller in Auto Mode
Controller output tracks PV
Controller output tracks setpoint
setpoint tracks PV
PV tracks setpoint
23
What is the purpose of the battery back up in PLC?
To operate the process for a short period of time upon loss of power
To maintain the program ROM upon loss of power
To maintain the PLC operation upon loss of power
To maintain the contents of the RAM upon loss of power
24
Following instrument is used to measure shaft phase angle and give signal per rotation
Proximeters
Accelometers
Tacometer
Keyphaser
25
A ______ acting positioner is one whose output tends to increase as the measurement signal decreases
Direct
Proportional
Reverse
On/off
26
Risk is a function of what two things, in terms of safety?
Frequency & severity
Frequency & likelihood
Severity & consequences
Failure rates & failure modes
27
What are the three main phases of the industrial control system's Cybersecurity Lifecycle?
Assess, Develop & Mitigate, Maintain
Design, Implement, Maintain
Design, Mitigate, Maintain
Assess, Develop & Implement, Maintain
28
Cold junction compensation is required for which type of temperature measurement device?
RTD
infrared pyrometer
Bi-metal thermometer
Thermocouples
29
Fail-safe conditions in a valve happen when
pneumatic signal is lost
control system signals a failure
Actuation energy is lost
Electrical signal is lost
30
Bench set is a term associated with
Fail-closed valves
Linear Motion valves
1/4 turn valves
Spring-opposed diaphragm actuated valves
31
Cascade control has the following
Two processes, two transmitters, one valve, no controller
Two processes, two transmitters, one valve, two controllers
Two processes, two transmitters, two valves, no controller
Two processes, two transmitters, two valves, two controllers
32
An instrument location plan shows the _______ of each instrument
location and wiring plan
location, elevation, and tag number
location, specification number, and tag number
location, specification number, and elevation
33
In logical analysis troubleshooting, which step comes immediately after the first step: Identify and define the problem?
Evaluate the information/data.
If the problem is not resolved, reiterate until the problem is found
Gather information about the problem.
Implement a solution or conduct a test.
34
Ideally, a control system is grounded
at a single location near the control room or panel
Every 50 feet in the loop
at every field mounted instrument
Every 25 feet in the loop
35
To measure current in a circuit, without a clamp on probe, you must measure in _______, and the circuit must be _______.
Series, energized
Series, de-energized
Parallel, de-energized
Parallel, energized
36
A magnetic flow meter determines the flow of a process material by measuring the ________ of the fluid
Volume
Velocity
Density
Conductivity
37
When performing a zero-based calibration on a D/P transmitter, the low pressure port of the transmitter
should be vented to atmosphere
should be connected to a 2.04"Hg vacuum source
should be connected to the high pressure air supply
should be closed
38
A(n) _________ is an electromagnet with a plunger that is activated when a voltage is applied.
solenoid
sump pump
pressure switch
actuator
39
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their
high viscosity index.
low electrical conductivity.
low thermal conductivity.
low flash point.
40
The direct acting actuator is _________
Air to close type actuator
applicable for motorized actuator
Piston type actuator
Air to open type actuator
41
Feedforward control operates on the measurement of
Disturbance variable
Process variable
Measured variable
Manipulated variable
42
A control valve is installed on a steam process. The process pressure is 1000 psi and 250°C. What is the valve ratings?
2000 psi, 100°C
1000 psi, 500°C
1000 psi, 150°C
500 psi, 500°C
43
A nuclear density meter on an oil pipeline is showing erratic output. What is the fault?
The source beam path is permanently obstructed.
The scintillation counter is defective.
The source has decayed.
The shutter has been left partially closed.
44
Valve packing selection is based on
The operating properties of the process
Stiction forces generated
The size of the actuator
The pressure drop across the valve
45
Which of the following is unacceptable for high temperature applications?
Angle type globe valve
Single seated globe valve
Multi-orifice gate valve
Weir type diaphragm valve
46
Which type of drawing provides detailed piping and process information, including wire terminations?
Piping and Instrument Diagrams (P&IDs)
Loop Wiring Diagrams
SAMA diagrams
Wiring Schedules
47
Where must the intrinsically safe (I.S) barrier be installed when supplying a device in a Class 1, Zone 2 area?
A hazardous area with the ground bus bars returned to plant ground.
A safe area with an isolated ground.
A safe area with no grounds.
A hazardous area with no grounds.
48
Identify which frequency band is being used in many wireless network systems.
3200 MHz
120 MHz
960 MHz
2400 MHz
49
The purpose of an intrinsic safety barrier is to
prevent excess voltage or current from reaching the hazardous area
establish a central grounding point in the hazardous area
increase the resistance in the circuit to reduce the risk of explosion
provide a physical obstruction between the hazardous and nonhazardous areas
50
What is the purpose of the Rectifier section of the Variable Frequency Drive?
Converts AC to DC
Filters output DC to a choppy AC
Develops a DC input to AC
Monitors and develops current for the Microprocessor
51
Which of the following is not a pressure guage attachment
Guage saver / dampeners
Syphon
Pressure valve limiter
Pressure reducing valve
52
While terminating fiber optic cable which of the following is not required?
Patch chords
Patch panel
Router / Modem
Pig tails
53
Following is true for controller in manual mode
Controller output tracks PV
Controller output tracks setpoint
PV tracks setpoint
Setpoint tracks PV
54
If a 10Ω, 20Ω, 40Ω, and 80Ω resistors are connected in series, which will dissipate the most heat?
40Ω
10Ω
20Ω
80Ω
55
What is the value of a resistor that is: Green - Brown - Orange - Gold?
51 K ohms ±5%
80 K ohms ±5%
51 K ohms ±10%
503 ohms ±10%
56
Which of the following forces is not a consideration in sizing an actuator?
Stem force and stem unbalance
Packing friction and seat tightness
Dynamic unbalance
Body temperature and pressure rating
57
When selecting a replacement component, which factor ensures that a conveyor electronic weighscale will function?
Minimum width of belt.
Average speed of belt.
Sensor specifications.
Maximum length of belt.
58
What is the mA output if input pressure is 235psi when a pressure transmitter has a measurement range of 200-300psi?
17.5 mA
3.8 mA
6.4 mA
9.6 mA
59
What is the principle of operation of a Bulls-eye level gauge when used on a steam boiler application?
Conductivity of water.
Differing refractive indexes of steam and water.
Resistance change of a resistance temperature detector.
Voltage change of a thermocouple.
60
What is used to calibrate the maximum range value of a blade type mechanical consistency transmitter?
Force bar.
Feedback unit.
Test weight.
Fulcrum.
61
What are the safety concerns when installing a new pressure switch in a hazardous area?
Pressure rating, enclosure classification and wetted parts.
Contact rating, pressure rating and wetted parts.
Enclosure type, contact rating and deadband.
Accuracy, pressure rating and wetted parts.
62
Which flowmeter is suitable for Low Reynolds number and high viscous service?
Orifice
Wedge
Venturi
Pitot
63
Which network design is the most robust (from a failure standpoint)?
Linear topology
Bus topology
Star topology
Mesh topology
64
The term topology is often used with digital control systems to describe?
Interconnection of control components
All of the model numbers of each device
The physical locations of field devices
The firmware revision number
65
What needs to be done on a level control using a capacitance probe as the sensor, if the process liquid medium changes?
probe’s grounding system will need to be relocated.
should be no effect on the control loop performance.
Adaptive control action will need to be added to the controller.
transmitter will need to be recalibrated.
66
Select the false statement for 5 valve manifold used in DP application
Isolating valves are always open during normal operation
Equalize valve is used only during calibration and taking in/out of service
Drain/Vents ports are closed during normal operation
Equalize valve is always open during normal operation
67
OPC has which of the following advantages
Open Standard (specification maintained by OPC Foundation)
Optimized for fast data transfers
Any Client can talk to any server
All of the Answers
68
Which of the following is a ′contact′ pyrometer ?
infrared pyrometer
optical pyrometer
radiation pyrometer
resistance pyrometer
69
The condition of how much successive readings differ from one another for a fixed value of the variable is called :
error
sensitivity
accuracy
precision
70
Loop Checking is a process of validating
Factory acceptance testing, documentation, operating procedures
Calibration, receipt verification, loop tuning, documentation
Site acceptance testing, operating procedures, device placement.
Terminations, wiring, documentation, device placement
71
What is the difference between re-ranging and calibrating smart transmitters?
Re-ranging is trimming to the D/A and setting the LRV and URV.
Calibration is trimming to the D/A.
Re-ranging is trimming to the D/A.
Calibration is setting the LRV and URV.
72
Which of the following is applicable for an Orifice Flow Element?
DP is variable and flow passage area is variable
DP is variable and flow passage area is constant
DP is irrelevant and flow passage area is constant
None of these answers apply

Redseal Exam Practice Flashcards | StudBud