ABSA 4A UNIT 9 Questions with CORRECT Answers
(Grade A+)
Question 1:
Which chart recorder came first? a. Circular b. Circular strip c. Strip d. Strip chart circular
Answer:
a. Circular
Question 2:
A valve which gives good throttling action, takes less actuator force, but does not seal well is a: Select
one: a. Double seated valve b. Reverse acting valve c. Single seated valve d. Direct acting valve
Answer:
a. Double seated valve
Question 3:
A variable which is adjusted in order to maintain or achieve some desired value of another variable is
termed the: Select one: a. Process variable b. Final variable c. Manipulated variable d. Controlled
variable
Answer:
c. Manipulated variable
Question 4:
Fail-closed solenoid operated valves open when Select one: a. a coil is electrically energized b.
pressure below the valve disc overcomes the spring pressure above the disc c. an electric motor opens
the valve d. it is de-energized
Answer:
a. a coil is electrically energized
Question 5:
The Bourdon tube is often shaped in the form of a "C", having an arc span of about: Select one: a. 180
degrees b. 200 degrees c. 90 degrees d. 270 degrees
Answer:
d. 270 degrees
, Question 6:
Electro-hydraulic valves open slowly when energized. However, when electric power is interrupted, a
powerful _____________ quickly slams the valve shut, thereby stopping the fuel flow to the burner. a.
Spring b. Diaphragm c. Motor d. Bellows
Answer:
a. Spring
Question 7:
A helix strip bimetallic thermometer is wound spirally to: Select one: a. Dampen the motion of the
pointer b. Ease its installation c. Increase the range of temperature it can measure d. Amplify the
motion of the pointer
Answer:
d. Amplify the motion of the pointer
Question 8:
Putting a controller on manual control means: Select one:
Answer:
a. The operator controls the final control element. a. The operator controls the final control element. b.
The controller output responds to a process variable. c. There is no control of the final control element.
d. The operator manually adjusts the process by changing the process variable signal
Question 9:
What are two methods of signal transmission? a. Digital and fibre optic b. Analog and digital c. Analog
and transducer d. Digital and current
Answer:
b. Analog and digital
Question 10:
The main purpose of a manometer is to measure the difference between which factors? a. Two
pressures b. Two flows c. Two temperatures d. Two levels
Answer:
a. Two pressures
(Grade A+)
Question 1:
Which chart recorder came first? a. Circular b. Circular strip c. Strip d. Strip chart circular
Answer:
a. Circular
Question 2:
A valve which gives good throttling action, takes less actuator force, but does not seal well is a: Select
one: a. Double seated valve b. Reverse acting valve c. Single seated valve d. Direct acting valve
Answer:
a. Double seated valve
Question 3:
A variable which is adjusted in order to maintain or achieve some desired value of another variable is
termed the: Select one: a. Process variable b. Final variable c. Manipulated variable d. Controlled
variable
Answer:
c. Manipulated variable
Question 4:
Fail-closed solenoid operated valves open when Select one: a. a coil is electrically energized b.
pressure below the valve disc overcomes the spring pressure above the disc c. an electric motor opens
the valve d. it is de-energized
Answer:
a. a coil is electrically energized
Question 5:
The Bourdon tube is often shaped in the form of a "C", having an arc span of about: Select one: a. 180
degrees b. 200 degrees c. 90 degrees d. 270 degrees
Answer:
d. 270 degrees
, Question 6:
Electro-hydraulic valves open slowly when energized. However, when electric power is interrupted, a
powerful _____________ quickly slams the valve shut, thereby stopping the fuel flow to the burner. a.
Spring b. Diaphragm c. Motor d. Bellows
Answer:
a. Spring
Question 7:
A helix strip bimetallic thermometer is wound spirally to: Select one: a. Dampen the motion of the
pointer b. Ease its installation c. Increase the range of temperature it can measure d. Amplify the
motion of the pointer
Answer:
d. Amplify the motion of the pointer
Question 8:
Putting a controller on manual control means: Select one:
Answer:
a. The operator controls the final control element. a. The operator controls the final control element. b.
The controller output responds to a process variable. c. There is no control of the final control element.
d. The operator manually adjusts the process by changing the process variable signal
Question 9:
What are two methods of signal transmission? a. Digital and fibre optic b. Analog and digital c. Analog
and transducer d. Digital and current
Answer:
b. Analog and digital
Question 10:
The main purpose of a manometer is to measure the difference between which factors? a. Two
pressures b. Two flows c. Two temperatures d. Two levels
Answer:
a. Two pressures
