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ISA > Domain 3 / Troubleshooting > Flashcards

Domain 3 / Troubleshooting Flashcards

1
Q 
What is a thermowell?
A. Protective tube
B. Type of manometer
C. Expandable bulb
D. Reservoir
A

A. Protective tube

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2
Q

The body of a valve may contain packing material that prevents leakage:
A. along the valve stem
B. between the seat and the disk
C. between the bonnet and the body
D. between the inlet and outlet ports of the valve

A

A. along the valve stem

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3
Q 
Which type of flowmeter does a rotor mounted axially within a pipe between a set of bearings describe?
A. Magnetic
B. Turbine
C. Water meter
D. Venturi tube
A

B. Turbine

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4
Q 
Which type of flowmeter measures flow by measuring volume directly?
A. Coriolis
B. Magnetic
C. Positive displacement
D. Differential pressure
A

C. Positive displacement

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5
Q

What occurs if the temperature of the thermocouple measuring junction is lower than the reference junction?
A. There is no emf output
B. The output voltage polarity is reversed
C. The polarity stays the same but the voltage increases
D. The emf remains the same when the temperature changes

A

B. The output voltage polarity is reversed

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6
Q

A ground loop on shielded cable can be avoided by:
A. attaching a safety ground to the instrument casing
B. grounding the shield only at one end of the circuit
C. attaching a safety ground to the control panel
D. grounding the shield at both ends of the cable

A

B. grounding the shield only at one end of the circuit

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7
Q

A meter reading of only 1 ohm between an ungrounded signal lead and the earth ground indicates a problem of:
A. a lead having an unwanted connection to ground
B. an open circuit from the lead to the ground
C. an open circuit from the lead to the casing
D. none of the above

A

A. a lead having an unwanted connection to ground

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8
Q 
What kind of wires in a process control loop would most likely be shielded cables?
A. Power wires
B. Ground wires
C. Signal wires
D. Control wires
A

C. Signal wires

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9
Q 
A device used to change an analog signal to a digital signal is most often called a:
A. transducer
B. signal conditioner
C. transmitter
D. converter
A

D. Converter

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10
Q 
A breadboarding area is:
A. a data routing circuit
B. used to design or test electronic circuits
C. a code-converting circuit
D. a temporary binary storage area
A

B. used to design or test electronic circuits

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11
Q 
A 4-20 mA electronic transmitter has an input range of 50-330 deg. F. If the output is 13.77 mA, what is the indicated temperature in deg. F?
A. 173
B. 221
C. 266
D. 302
A

B. 221

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12
Q 
If the range of a 3 - 15 PSI pneumatic transmitter is 50 - 350 deg F, what is the output signal value, in PSI, at 198 deg F?
A. 5.7
B. 7.2
C. 8.9
D. 12.6
A

C. 8.9

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13
Q 
When the percentage of flow through a valve equals the percentage of plug movement, a valve has:
A. linear flow characteristic
B. equal percentage flow characteristic
C. quick opening flow characteristic
D. curved flow characteristic
A

A. linear flow characteristic

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14
Q 
Which of the following parts of a globe valve serves the same purpose as the disk in a butterfly valve?
A. seat
B. plug
C. packing rings
D. packing flange
A

B. plug

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15
Q 
The process of grinding the plug and seat of a valve is called:
A. characterizing
B. linearizing
C. lapping
D. calibrating
A

C. lapping

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16
Q

The dead band of an instrument is:
A. the band that prevents the instrument from being tampered with by unauthorized persons
B. the range of values for which the instrument gives inaccurate readings
C. the size of the instrument indicated by the divisions on the scale of the instrument
D. the range that an input signal may be changed on reversal of direction without an observable change in the output

A

D. the range that an input signal may be changed on reversal of direction without an observable change in the output.

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17
Q

A continuity check should be made prior to the hook-up of a field transmitter to the control room so that the technician:
A. can assure that the transmitter is being hooked up to the proper indicator/controller
B. cam make sure that the proper voltages ar present
C. can make sure that he continue hook-up on a particular transmitter
D. knows that he may connect another transmitter to the loop circuit.

A

A. can assure that the transmitter is being hook-up to the proper indicator/controller

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18
Q 
Impulse lines are used with:
A. pressure meters
B. magnetic flowmeters
C. positive displacement meters
D. open channel meters
A

A. pressure meters

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19
Q 
Which meter does not use an obstruction?
A. Head meter
B. Magnetic meter
C. Open channel meter
D. Turbine meter
A

B. Magnetic meter

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20
Q 
The Coriolis effect is associated with the:
A. head meter
B. mass flowmeter
C. positive displacement meter
D. turbine meter
A

B. mass flowmeter

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21
Q

A beveled orifice should form an angle of:
A. Not less than 30 deg. to the axis of the pipe
B. not more than 30 deg. to the axis of the pipe
C. not less than 45 deg. to the axis of the pipe
D. not more than 45 deg. to the axis of the pipe

A

C. not less than 45 deg. to the axis of the pipe

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22
Q 
Which orifice plate is used to eliminate damming of material at the top or bottom of the pipe?
A. concentric
B. round-edged
C. quadrant-edged
D. segmental
A

D. segmental

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23
Q 
The most common pressure tap is the:
A. corner
B. flange
C. pipe
D. vena contracta
A

B. flange

24
Q 
One of the most important considerations of the installation of an electromagnetic flowmeter is:
A. the Reynolds number of the fluid
B. the use of the straightening vane
C. bonding the flowmeter to the piping
D. observing the correct polarity
A

C. bonding the flowmeter to the piping

25
Q 
Control valves which have a plug positioned by a stem which slides through a packing gland are often referred to as:
A. rotary motion control valves
B. linear motion control valves
C. ball control valves
D. motorized control valves
A

B. linear motion control valves

26
Q 
The control valve that produces an inherent equal percentage of increase, or decrease, over the existing flow when the plug is repositioned has a(n) \_\_\_\_\_\_\_\_\_ characteristic under constant pressure drop conditions.
A. modified parabolic
B. equal percentage
C. linear
D. quick opening
A

B. equal percentage

27
Q 
If a control valve will pass 25% of it's full capacity when it is 25% open, 50% of it's capacity when 50% open, and 75% when 75% open, the inherent characteristic is:
A. quick opening
B. equal percentage
C. throttling
D. linear
A

D. linear

28
Q 
If the pressure drop (delta P) across a valve increases, without a change in valve position, the flow of fluid through the valve will normally:
A. decrease
B. increase
C. remain the same
D. change direction
A

B. increase

29
Q

A piston actuator:
A. seldom has a pneumatic actuator
B. can only be actuated by hydraulic pressure above 100 PSIG
C. cannot be made fail safe without electric limit switches
D. can be used if a long stroke or high actuator pressure is required

A

D. can be used if a long stroke or high actuator pressure is required

30
Q 
An instrument calibration error is reported.  Your analysis of the calibration plot (FIg. 3-1) determines that \_\_\_\_\_\_\_, and the instrument does, in fact, need recalibration.
A. there is a zero error
B. there is a span error
C. there is both a zero and a span error
D. there is a linearity error
A

B. there is a span error

31
Q

Which of the following is not necessary when zeroing or calibrating a magnetic flowmeter?
A. Calibration factor for the flow tube assembly
B. Flow tube full of process material
C. proper grounding
D. warm-up period for the fluid in the system

A

D. warm-up period for fluid in the system

32
Q 
A DP cell is mounted 3 ft. below the zero level in an open tank.  For a true level reading, the transmitter output must be:
A. calibrated for elevated zero
B. calibrated for span
C. calibrated for true zero
D. calibrated for suppressed zero
A

D. calibrated for suppressed zero

33
Q 
The standard range for pneumatically transmitted signals is:
A. 3-15 PSIG
B. 5-20 PSIG
C. 1-10 PSIG
D. 4-20 PSIG
A

A. 3-15 PSIG

34
Q 
Approximately what is the pressure, in psi, at the bottom of a 20 ft tank filled to 100% of capacity with a fluid that has a specific gravity of 1.5?
A. 8.7
B. 12.99
C. 5
D. 35
A

B. 12.99

35
Q 
A process variable which is to be maintained at some desired value (temperature, pressure, level, flow) by means of manipulating another process variable, is the:
A. manipulated variable
B. measured variable
C. controlled variable
D. disturbance variable
A

C. controlled variable

36
Q 
A plant has a water tank mounted on top of an 80 foot platform.  The tank is 30 ft high.  What is the level of water in the tank if a differential pressure transmitter mounted on the bottom of the tank reads 277 inches of water?
A. 10 feet
B. 17 feet
C. 23 feet
D. 30 feet
A

C. 23 feet

37
Q 
The pressure at the bottom of a 20 foot tank completely filled with a fluid that has a specific gravity of 1.75 will be:
A. 11.428 PSI
B. 15.15 PSI
C. 21.75
D. 35 PSI
A

B. 15.15 PSI

38
Q

Pneumatic actuators:
A. cannot be used in hazardous or high humidity atmospheres
B. can be made fail safe
C. do not have sufficient speed or power for most applications
D. are too complicated and unreliable for many applications

A

B. can be made fail safe

39
Q 
A hollow, metal cylinder which guides the movement of the plug and holds the seat ring in place is found in a:
A. seat
B. butterfly valve
C. cage valve
D. ball
A

C. cage valve

40
Q 
Per ISA-5.1-1984 (R1992) -- "Instrument Symbols and Identification", this (- - - - - - - - - - - -) is a(n) \_\_\_\_\_\_\_\_\_\_\_\_\_ instrument line symbol
A. electric
B. pneumatic
C. hydraulic
D. sonic
A

A. electric

41
Q 
The line symbol from ISA-5.1-1984 (R1992) -- "Instrument Symbols and Identification" (see photo) identifies a(n):
A. mechanical link
B. electrical signal
C. pneumatic signal
D. hydraulic signal
A

C. pneumatic

42
Q 
In this drawing, FY - 902 is a(n) \_\_\_\_\_\_\_\_\_\_ function.
A. analysis
B. multiplication
C. square root
D. summing
A

C. square root

43
Q 
The term valve "trim" refers to the:
A. pneumatic actuator
B. stem, plug, and seat ring
C. orientation in a process installation
D. body style and material of construction
A

B. stem, plug, and seat ring

44
Q 
In a bubbler level measuring system with the open end of the purge pipe at the bottom of the tank, the air pressure in the pipe is \_\_\_\_\_\_\_\_ the pressure exerted by the liquid at the bottom of the tank.
A. less than
B. equal to
C. twice
D. three times
A

B. equal to

45
Q 
As the temperature rises in a closed vessel, the pressure:
A. increases
B. decreases
C. stays the same
D. increases then decreases
A

A. increases

46
Q 
When a dip pipe (bubbler) system is used for tank level measurement, the dip pipe is connected to:
A. an unregulated gas supply
B. the low side of the DP cell
C. the high side of the DP cell
D. the DP cell output signal line
A

C. The high side of the DP cell

47
Q 
The temperature of the product in a storage tank increases.  What device will still give an accurate signal indicating the true mass in the tank?
A. load cell
B. DP cell
C. thermal element
D. float
A

A. load cell

48
Q 
In which of the following does increasing signal pressure cause the actuator stem to retract and close a valve? 
A. direct action, air-to-close
B. direct action, air-to-open
C. reverse action, air-to-close
D. reverse action, air-to-open
A

C. reverse action, air-to-close

49
Q 
A field-mounted pressure device that changes a process variable measurement into a signal that can be used by a receiving instrument located in a control room is usually called a:
A. D/P transducer
B. signal conditioner
C. D/P transmitter
D. signal converter
A

C. D/P transmitter

50
Q 
The pressure taps in a standard set of orifice flanges are located \_\_\_\_\_\_\_\_ upstream from the leading edge of the orifice, and \_\_\_\_\_\_\_\_\_ downstream from the trailing edge of the orifice plate.
A. 8 inches, 5 inches
B. 5 inches, 8 inches
C. 30 inches, 10 inches
D. 1 inch, 1 inch
A

D. 1 inch, 1 inch

51
Q

A bench test of a spring and diaphragm actuator with a positioner shows that full stem travel is not obtained even when the full supply pressure is available to the positioner. Which of the following conditions is the most likely cause of the problem?
A. The actuator diaphragm area is too large
B. The stem is too thick
C. A stem travel stop is out of adjustment
D. The spring is too weak

A

C. A stem travel stop is out of adjustment

52
Q 
The oil within the variable capacitor of a capacitance-type differential pressure transmitter is separated from the process by:
A. a sensing diaphragm
B. capacitor plates
C. isolating diaphragms
D. bellows
A

C. isolating diaphragms

53
Q 
The leakage of a metal-seated valve may be reduced by a process called:
A. lapping
B. calibrating
C. linearizing
D. characterizing
A

A. lapping

54
Q 
The results of an orifice plate installed with the bevel on the wrong side is:
A. damage to the plate
B. erratic meter readings
C. high meter readings
D. low meter readings
A

D. low meter readings

55
Q

When selecting calibration equipment, a CST must verify that the:
A. calibration equipment is more accurate than the device to be calibrated
B. device to be calibrated is more accurate than the test equipment
C. controller positioning the control valve is accurate
D. process is diverted from the device to be calibrated

A

A. calibrated equipment is more accurate than the device to be calibrated

56
Q 
The output signal from a digital control system can NOT be in response to \_\_\_\_\_\_\_\_\_ input.
A. one
B. more than one
C. less than one
D. an analog
A

C. less than one

ISA (4 decks)

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