SACA C-304 QUESTIONS & ANSWERS
What troubleshooting method is least effective? - Answer -Shotgun
What is the first step a technician must take when troubleshooting a a machine? -
Answer -Identify symptons
You are called over to a machine because the actuators are moving slow, you notice
that the pressure regulator has low pressure, you don't see or hear anything else. What
is the next thing you should check? - Answer -Pressure regulator settings
What is the common instrument used to troubleshoot pneumatic circuits? - Answer -
Pressure gauge
A technician recently worked on a vacuum lift system to replace all the vacuum cups.
Now the lift is damaging the parts. You check the supply pressure and notice that it is
fine. What is the most likely cause? - Answer -Vaccum cups too big
Over contamination of the air supply in a pneumatic system is a sign of what? - Answer
-Wrong element size
Damaged element
No filter installed
Filter bypassed
All of the above
What is the last step a technician performs in removing LOTO? - Answer -Test machine
A technician is testing a cylinder on a machine, the cap end port is opened, the cylinder
is fully retracted being held and air is coming out the cap end port. This is a sign that? -
Answer -Piston seal worn
An actuator stopped moving, what is not a likely cause? - Answer -FCV check valve
stuck open
Worn seals
Blocked inlet port
Load increase
All of these can cause no acuator movement
What test will tell you if a pilot operated DCV spool is shifting, if an actuator is not
moving? - Answer -Disconnect actuator lines, activate valve and check for air out of
ports
What is a sign that the lubricator is misadjusted is? - Answer -Oil misting from exhaust
ports
, When troubleshooting a PLC controlled pneumatic system using I/O indicators, what
information is needed? - Answer -Sequence chart
What reading on a DMM tells a technician if a N.O limit switch was working correctly?
(one lead of the DMM on each side of the contacts, and limit switch activated) - Answer
-0 Voltage
A __________ solution can be used around the threads of a fitting to check for leakage
- Answer -Soap
A DCV spool that will not return to its neutral position may be the result of a broken
_________ - Answer -Return spring
A continuous input to the PLC from the vacuum switch may be the result of
__________. - Answer -A short in the electrical wiring or switch
What troubleshooting method performs tests based on components known to cause the
symptom(s)? - Answer -Symptom and Cause
What troubleshooting method checks the actuator 1st, FCV 2nd, DCV 3rd? - Answer -
Output-Back
What test should be performed to check if a cylinder has a bent rod - Answer -Check
with straight edge
A pneumatic motor will not start with correct pressure at the inlet port and exhaust at the
outlet port, what test tells you the issue is with the actuator? - Answer -Disconnect load
and check if motor starts
What fault is least likely to cause erratic actuator movement? - Answer -Lubricator
pickup tube blocked
Which troubleshooting technique tests for a worn cylinder rod seal? - Answer -Listen for
external air leak
A pneumatic rotary actuator is not moving, you have verified that there is pressure at
the actuator inlet. What test can you perform to determine if the actuator has failed? -
Answer -Disconnect load and check for actuator movement
A multistep PLC controlled machine stopped at the end of step 2 of 10. What would be
the next step in troubleshooting?
The general power and pressure indicators show normal - Answer -Check the status of
the input indicators
What step should be performed first when identifying a symptom? - Answer -Talk to
operator
What troubleshooting method is least effective? - Answer -Shotgun
What is the first step a technician must take when troubleshooting a a machine? -
Answer -Identify symptons
You are called over to a machine because the actuators are moving slow, you notice
that the pressure regulator has low pressure, you don't see or hear anything else. What
is the next thing you should check? - Answer -Pressure regulator settings
What is the common instrument used to troubleshoot pneumatic circuits? - Answer -
Pressure gauge
A technician recently worked on a vacuum lift system to replace all the vacuum cups.
Now the lift is damaging the parts. You check the supply pressure and notice that it is
fine. What is the most likely cause? - Answer -Vaccum cups too big
Over contamination of the air supply in a pneumatic system is a sign of what? - Answer
-Wrong element size
Damaged element
No filter installed
Filter bypassed
All of the above
What is the last step a technician performs in removing LOTO? - Answer -Test machine
A technician is testing a cylinder on a machine, the cap end port is opened, the cylinder
is fully retracted being held and air is coming out the cap end port. This is a sign that? -
Answer -Piston seal worn
An actuator stopped moving, what is not a likely cause? - Answer -FCV check valve
stuck open
Worn seals
Blocked inlet port
Load increase
All of these can cause no acuator movement
What test will tell you if a pilot operated DCV spool is shifting, if an actuator is not
moving? - Answer -Disconnect actuator lines, activate valve and check for air out of
ports
What is a sign that the lubricator is misadjusted is? - Answer -Oil misting from exhaust
ports
, When troubleshooting a PLC controlled pneumatic system using I/O indicators, what
information is needed? - Answer -Sequence chart
What reading on a DMM tells a technician if a N.O limit switch was working correctly?
(one lead of the DMM on each side of the contacts, and limit switch activated) - Answer
-0 Voltage
A __________ solution can be used around the threads of a fitting to check for leakage
- Answer -Soap
A DCV spool that will not return to its neutral position may be the result of a broken
_________ - Answer -Return spring
A continuous input to the PLC from the vacuum switch may be the result of
__________. - Answer -A short in the electrical wiring or switch
What troubleshooting method performs tests based on components known to cause the
symptom(s)? - Answer -Symptom and Cause
What troubleshooting method checks the actuator 1st, FCV 2nd, DCV 3rd? - Answer -
Output-Back
What test should be performed to check if a cylinder has a bent rod - Answer -Check
with straight edge
A pneumatic motor will not start with correct pressure at the inlet port and exhaust at the
outlet port, what test tells you the issue is with the actuator? - Answer -Disconnect load
and check if motor starts
What fault is least likely to cause erratic actuator movement? - Answer -Lubricator
pickup tube blocked
Which troubleshooting technique tests for a worn cylinder rod seal? - Answer -Listen for
external air leak
A pneumatic rotary actuator is not moving, you have verified that there is pressure at
the actuator inlet. What test can you perform to determine if the actuator has failed? -
Answer -Disconnect load and check for actuator movement
A multistep PLC controlled machine stopped at the end of step 2 of 10. What would be
the next step in troubleshooting?
The general power and pressure indicators show normal - Answer -Check the status of
the input indicators
What step should be performed first when identifying a symptom? - Answer -Talk to
operator
