4th TSSA Part A - Unit 9 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
(4-085-4.3) The Bourdon tube can be used with a bulb and capillary tube to measure: -
CORRECT ANSWER - Temperature
(4-089-1.3) Sharing and transferring information between computers is termed: - CORRECT
ANSWER - Networking
Computers are used in plants for managing maintenance, one function that cannot be done by
computer alone is: - CORRECT ANSWER - maintenance cost reports
(4-084-1.7) An open loop control system requires: - CORRECT ANSWER - Constant
operator attention
(4-084-1.3) In a "closed loop" system of control, the control behaviour is - CORRECT
ANSWER - Automatic
Which analog signal input can a PLC accept? - CORRECT ANSWER - 4-20 mA
(4-084-4.1) Automatic systems that can make decisions are termed: - CORRECT
ANSWER - Logic systems
(4-085-1.6) Low pressures and vacuums may be measured: - CORRECT ANSWER - With
a manometer
A PLC needs a(n) ___________ to accept operator input: - CORRECT ANSWER - HMI
, (4-086-3.6) A valve body that seals on the down stroke is: - CORRECT ANSWER - Direct
acting
(4-085-3.3) An orifice plate with a round opening that is centred in the middle of the plate is
called a: - CORRECT ANSWER - Concentric orifice
(4-085-2.2) The constant head connection in a remote water level indicator is made to the: -
CORRECT ANSWER - Steam space
On-off thermostats are equipped with: - CORRECT ANSWER - An open contact switch
(4-086-1.3) In a pneumatic control system, the nozzle receives a regulated air supply pressure of
approximately: - CORRECT ANSWER - 140 kPa
(4-089-2.1) The type of circuit used to store (write) and retrieve (read) information from a
computer is known as its: - CORRECT ANSWER - RAM
Why were PLC's developed? - CORRECT ANSWER - To allow use of multiple inputs
and outputs
(4-085-1.11) The Bourdon tube is often shaped in the form of a "C", having an arc span of about:
- CORRECT ANSWER - 270 degrees
(4-084-2.3) For a pneumatic control system, it is imperative that: - CORRECT ANSWER -
The air supply is kept clean and dry
(4-086-3.8) Control valves - CORRECT ANSWER - Provide variable resistance in a
piping system
The bimetal sensing element consists of a strip made up of two thin layers of metal with: -
CORRECT ANSWER - Different rates of thermal expansion
ACTUAL Exam Questions and CORRECT
Answers
(4-085-4.3) The Bourdon tube can be used with a bulb and capillary tube to measure: -
CORRECT ANSWER - Temperature
(4-089-1.3) Sharing and transferring information between computers is termed: - CORRECT
ANSWER - Networking
Computers are used in plants for managing maintenance, one function that cannot be done by
computer alone is: - CORRECT ANSWER - maintenance cost reports
(4-084-1.7) An open loop control system requires: - CORRECT ANSWER - Constant
operator attention
(4-084-1.3) In a "closed loop" system of control, the control behaviour is - CORRECT
ANSWER - Automatic
Which analog signal input can a PLC accept? - CORRECT ANSWER - 4-20 mA
(4-084-4.1) Automatic systems that can make decisions are termed: - CORRECT
ANSWER - Logic systems
(4-085-1.6) Low pressures and vacuums may be measured: - CORRECT ANSWER - With
a manometer
A PLC needs a(n) ___________ to accept operator input: - CORRECT ANSWER - HMI
, (4-086-3.6) A valve body that seals on the down stroke is: - CORRECT ANSWER - Direct
acting
(4-085-3.3) An orifice plate with a round opening that is centred in the middle of the plate is
called a: - CORRECT ANSWER - Concentric orifice
(4-085-2.2) The constant head connection in a remote water level indicator is made to the: -
CORRECT ANSWER - Steam space
On-off thermostats are equipped with: - CORRECT ANSWER - An open contact switch
(4-086-1.3) In a pneumatic control system, the nozzle receives a regulated air supply pressure of
approximately: - CORRECT ANSWER - 140 kPa
(4-089-2.1) The type of circuit used to store (write) and retrieve (read) information from a
computer is known as its: - CORRECT ANSWER - RAM
Why were PLC's developed? - CORRECT ANSWER - To allow use of multiple inputs
and outputs
(4-085-1.11) The Bourdon tube is often shaped in the form of a "C", having an arc span of about:
- CORRECT ANSWER - 270 degrees
(4-084-2.3) For a pneumatic control system, it is imperative that: - CORRECT ANSWER -
The air supply is kept clean and dry
(4-086-3.8) Control valves - CORRECT ANSWER - Provide variable resistance in a
piping system
The bimetal sensing element consists of a strip made up of two thin layers of metal with: -
CORRECT ANSWER - Different rates of thermal expansion
