PMMI Review
Study online at https://quizlet.com/_anp6g3
1. The spring in the DCV has broken: A 3/2 normally closed solenoid controlled,
spring return DCV is used to control a single acting, spring return cylinder. The
cylinder is used to clamp a part in a machine. When the solenoid is energized, the
part is clamped. When the signal is removed, the DCV does not return to neutral
resulting in the part remaining clamped. What is most likely the cause?
The solenoid has failed
The spring in the cylinder has broken
The spring in the DCV has broken
The pressure port is blocked
2. The spring in the cylinder has broken: A 3/2 normally closed solenoid con-
trolled, spring return DCV is used to control a single acting, spring return cylinder.
The cylinder is used to clamp a part in a machine. When the solenoid is energized,
the part is clamped. When the signal is removed, the cylinder does not return
resulting in the part remaining clamped. The cylinder can be pushed back by hand.
What is most likely the cause?
The solenoid has failed
The spring in the cylinder has broken
The spring in the DCV has broken
The pressure port is blocked
3. The downstream pressure could be higher than the pressure setting: What
happens when a pneumatic regulators self-bleed vent is blocked?
The valve will always be closed
The valve will always be open
The downstream pressure could be higher than the pressure setting
The downstream pressure will not be able to rise to the pressure setting
4. Half-Split: Which troubleshooting method takes its first measurement at the
halfway point in a system?
Output-Back
Shotgun
Symptom-Cause
Half-Split
5. Well Manometer: What device is typically used to measure very low pressure or
vacuum readings?
Bourdon Tube Gauge
Diaphragm Element Gauge
Capsule Element Gauge
Well Manometer
6. 0.4: If the scale shown above is in inches of water, what is the psi reading?
, PMMI Review
Study online at https://quizlet.com/_anp6g3
11.5
6
5.5
0.4
7. Pressure Compensated Flow Control Valve: What type of device should be
used to maintain the speed of a hydraulic motor running a conveyor that experiences
load variations?
Pressure Reducing Valve
Flow Control Valve
Pressure Compensated Flow Control Valve
Sequence Valve
8. Limit downstream pressure: What is the purpose of device shown?
Limit downstream pressure
Limit upstream pressure
Relieve system pressure
Provide sequencing of actuators
9. Rotary shaft speed: What increases as hydraulic flow increases to a hydraulic
motor?
Rotary shaft speed
Linear displacement
Torque
Hydraulic pressure
10. Annular area: The rod side area that produces the pull force on a double-acting
cylinder is called what?
Blind area
Cap area
Annular area
Rod area
11. All of the above: How can the area of a circle be calculated?
r^2
À
Àd^2/4
0.7854d^2
All of the above
12. Solenoid operated and spring centered: The 5 port 3 position valve is typically
_____?
Air operated and spring offset
Spring offset and solenoid centered
, PMMI Review
Study online at https://quizlet.com/_anp6g3
Solenoid operated and pilot centered
Solenoid operated and spring centered
13. is equal throughout: Pascals Law states that pressure in a confined fluid at rest
____?
is laminar
is from high to low
is equal throughout
will take the path of least resistance
14. It's pressure doubles: According to Boyle's Law, when the volume of a gas is
cut in half,____?
It's pressure is cut in half
It's temperature doubles
It's temperature is cut in half
It's pressure doubles
15. The volume to fill the rod end is smaller: Why does a cylinder retract faster
than it extends?
The rod end area is larger
The fluid volume to extend is smaller
The cap end volume is smaller
The volume to fill the rod end is smaller
16. Spring force on the unpressurized side of the piston: What will cause a
single acting cylinder to retract?
Fluid pressure on the pressurized side of the piston
Pressure on both sides of the piston
Blocking flow from the cylinder
Spring force on the unpressurized side of the piston
17. Evaporation: Which of the following is not a method of moisture removal in a
pneumatic system?
Adsorption
Refrigeration
Mechanical
Evaporation
18. Troubleshooting and Testing: The manual override is used for?
Troubleshooting and Testing
Normal operations
Energy savings
Speed control
19. 8in2: What size piston would move 400 pounds with 50psi?
8in diameter
Study online at https://quizlet.com/_anp6g3
1. The spring in the DCV has broken: A 3/2 normally closed solenoid controlled,
spring return DCV is used to control a single acting, spring return cylinder. The
cylinder is used to clamp a part in a machine. When the solenoid is energized, the
part is clamped. When the signal is removed, the DCV does not return to neutral
resulting in the part remaining clamped. What is most likely the cause?
The solenoid has failed
The spring in the cylinder has broken
The spring in the DCV has broken
The pressure port is blocked
2. The spring in the cylinder has broken: A 3/2 normally closed solenoid con-
trolled, spring return DCV is used to control a single acting, spring return cylinder.
The cylinder is used to clamp a part in a machine. When the solenoid is energized,
the part is clamped. When the signal is removed, the cylinder does not return
resulting in the part remaining clamped. The cylinder can be pushed back by hand.
What is most likely the cause?
The solenoid has failed
The spring in the cylinder has broken
The spring in the DCV has broken
The pressure port is blocked
3. The downstream pressure could be higher than the pressure setting: What
happens when a pneumatic regulators self-bleed vent is blocked?
The valve will always be closed
The valve will always be open
The downstream pressure could be higher than the pressure setting
The downstream pressure will not be able to rise to the pressure setting
4. Half-Split: Which troubleshooting method takes its first measurement at the
halfway point in a system?
Output-Back
Shotgun
Symptom-Cause
Half-Split
5. Well Manometer: What device is typically used to measure very low pressure or
vacuum readings?
Bourdon Tube Gauge
Diaphragm Element Gauge
Capsule Element Gauge
Well Manometer
6. 0.4: If the scale shown above is in inches of water, what is the psi reading?
, PMMI Review
Study online at https://quizlet.com/_anp6g3
11.5
6
5.5
0.4
7. Pressure Compensated Flow Control Valve: What type of device should be
used to maintain the speed of a hydraulic motor running a conveyor that experiences
load variations?
Pressure Reducing Valve
Flow Control Valve
Pressure Compensated Flow Control Valve
Sequence Valve
8. Limit downstream pressure: What is the purpose of device shown?
Limit downstream pressure
Limit upstream pressure
Relieve system pressure
Provide sequencing of actuators
9. Rotary shaft speed: What increases as hydraulic flow increases to a hydraulic
motor?
Rotary shaft speed
Linear displacement
Torque
Hydraulic pressure
10. Annular area: The rod side area that produces the pull force on a double-acting
cylinder is called what?
Blind area
Cap area
Annular area
Rod area
11. All of the above: How can the area of a circle be calculated?
r^2
À
Àd^2/4
0.7854d^2
All of the above
12. Solenoid operated and spring centered: The 5 port 3 position valve is typically
_____?
Air operated and spring offset
Spring offset and solenoid centered
, PMMI Review
Study online at https://quizlet.com/_anp6g3
Solenoid operated and pilot centered
Solenoid operated and spring centered
13. is equal throughout: Pascals Law states that pressure in a confined fluid at rest
____?
is laminar
is from high to low
is equal throughout
will take the path of least resistance
14. It's pressure doubles: According to Boyle's Law, when the volume of a gas is
cut in half,____?
It's pressure is cut in half
It's temperature doubles
It's temperature is cut in half
It's pressure doubles
15. The volume to fill the rod end is smaller: Why does a cylinder retract faster
than it extends?
The rod end area is larger
The fluid volume to extend is smaller
The cap end volume is smaller
The volume to fill the rod end is smaller
16. Spring force on the unpressurized side of the piston: What will cause a
single acting cylinder to retract?
Fluid pressure on the pressurized side of the piston
Pressure on both sides of the piston
Blocking flow from the cylinder
Spring force on the unpressurized side of the piston
17. Evaporation: Which of the following is not a method of moisture removal in a
pneumatic system?
Adsorption
Refrigeration
Mechanical
Evaporation
18. Troubleshooting and Testing: The manual override is used for?
Troubleshooting and Testing
Normal operations
Energy savings
Speed control
19. 8in2: What size piston would move 400 pounds with 50psi?
8in diameter
