Power Engineering 4th and 3rd Class Instrumentation
Practice Questions With Complete Solutions
______ are used to convert physical quantities of flow, level,
temperature, pressure, and weight into electrical signals that
represent those quantities as accurately as possible.
a. Controllers.
b. Transducers.
c. Receiver.
d. Control valves.
e. Level switches. Correct Answers b. Transducers.
---------- allows operator to adjust the setpoint of the process.
a. DAC
b. I/O card
c. ADC
d. FCEs
e. OIU Correct Answers e. OIU
---------- normally used periodically.
a. Rom backup
b. Full backup
c. Incremental backup
d. Differential backup Correct Answers b. Full backup
--------------- is a discrete input device.
a. alarm horns
,b. warning light
c. level alarm
d. proximity switch
e. temperature alarm Correct Answers d. proximity switch
--------------- is a discrete output switch.
a. high limit switch
b. proximity switch
c. push button
d. strobe light
e. low limit switch Correct Answers d. strobe light
A "control" should be considered as a special device which:
a. is logic device capable of making decisions
b. leaves a hard-copy record of a system's performance
c. tries to maintain a set point
d. sends or transmits a positive rather than negative signal
e. notifies operators of errors or faults in a system Correct
Answers c. tries to maintain a set point
A "U" tube manometer may be filled with:
a. a gaseous substance
b. a granular substance
c. heavy oils
d. nitrogen
e. light oils Correct Answers e. light oils
,A bellows pressure sensing element is able to derive
considerable useful work or energy from very low pressure due
to:
a. an over-range tube
b. spiral connection
c. greater number of corrugations
d. phosphor-bronze connection
e. annular rings welded together Correct Answers c. greater
number of corrugations
A bimetal thermometer reacts to changes of:
a. pressure
b. humidity
c. flow
d. temperature
e. heat Correct Answers d. temperature
A bourdon tube
a. Are circular metal tubes filled with liquid or gas
b. Measure temperature by direct contact
c. Is installed vertically usually on a pigtail syphon
d. Is always installed horizontally on a pigtail syphon
e. Can be A type, O type, or D type Correct Answers c. Is
installed vertically usually on a pigtail syphon
A capillary is the name given to:
a. a tube with a small uniform bore
, b. the bulb holding the fluid of a filled thermometer
c. the line attached to the measuring junction of a thermocouple
d. the key part of a thermistor
e. a unit used only in refrigeration Correct Answers a. a tube
with a small uniform bore
A Central Processing Unit (CPU) performs input, output,
housekeeping and ---------- scans.
a. Program
b. Trend
c. Schedule
d. Detailed
e. Event Correct Answers a. Program
A chromatograph used electronic devices which:
a. work in conjunction with a thermocouple
b. increase in resistance as temperature rises
c. are made of chromel and alumel
d. have inverse resistance properties relative to temperature
e. utilize electrical current as a measurement base Correct
Answers d. have inverse resistance properties relative to
temperature
A circular chart recorder:
a. provides a different function to a strip chart
b. may incorporate a bourdon tube
c. is a later design than a strip chart
d. is used on a computer screen
Practice Questions With Complete Solutions
______ are used to convert physical quantities of flow, level,
temperature, pressure, and weight into electrical signals that
represent those quantities as accurately as possible.
a. Controllers.
b. Transducers.
c. Receiver.
d. Control valves.
e. Level switches. Correct Answers b. Transducers.
---------- allows operator to adjust the setpoint of the process.
a. DAC
b. I/O card
c. ADC
d. FCEs
e. OIU Correct Answers e. OIU
---------- normally used periodically.
a. Rom backup
b. Full backup
c. Incremental backup
d. Differential backup Correct Answers b. Full backup
--------------- is a discrete input device.
a. alarm horns
,b. warning light
c. level alarm
d. proximity switch
e. temperature alarm Correct Answers d. proximity switch
--------------- is a discrete output switch.
a. high limit switch
b. proximity switch
c. push button
d. strobe light
e. low limit switch Correct Answers d. strobe light
A "control" should be considered as a special device which:
a. is logic device capable of making decisions
b. leaves a hard-copy record of a system's performance
c. tries to maintain a set point
d. sends or transmits a positive rather than negative signal
e. notifies operators of errors or faults in a system Correct
Answers c. tries to maintain a set point
A "U" tube manometer may be filled with:
a. a gaseous substance
b. a granular substance
c. heavy oils
d. nitrogen
e. light oils Correct Answers e. light oils
,A bellows pressure sensing element is able to derive
considerable useful work or energy from very low pressure due
to:
a. an over-range tube
b. spiral connection
c. greater number of corrugations
d. phosphor-bronze connection
e. annular rings welded together Correct Answers c. greater
number of corrugations
A bimetal thermometer reacts to changes of:
a. pressure
b. humidity
c. flow
d. temperature
e. heat Correct Answers d. temperature
A bourdon tube
a. Are circular metal tubes filled with liquid or gas
b. Measure temperature by direct contact
c. Is installed vertically usually on a pigtail syphon
d. Is always installed horizontally on a pigtail syphon
e. Can be A type, O type, or D type Correct Answers c. Is
installed vertically usually on a pigtail syphon
A capillary is the name given to:
a. a tube with a small uniform bore
, b. the bulb holding the fluid of a filled thermometer
c. the line attached to the measuring junction of a thermocouple
d. the key part of a thermistor
e. a unit used only in refrigeration Correct Answers a. a tube
with a small uniform bore
A Central Processing Unit (CPU) performs input, output,
housekeeping and ---------- scans.
a. Program
b. Trend
c. Schedule
d. Detailed
e. Event Correct Answers a. Program
A chromatograph used electronic devices which:
a. work in conjunction with a thermocouple
b. increase in resistance as temperature rises
c. are made of chromel and alumel
d. have inverse resistance properties relative to temperature
e. utilize electrical current as a measurement base Correct
Answers d. have inverse resistance properties relative to
temperature
A circular chart recorder:
a. provides a different function to a strip chart
b. may incorporate a bourdon tube
c. is a later design than a strip chart
d. is used on a computer screen
