Inspect, troubleshoot, and replace seals in fluid power control valves and cylinders (ITI) Quiz, Fitter

Question 1

What is the slow or jerky movement of a hydraulic actuator from its set position known as?

Accepted Answer

Cylinder creep or drift

Answer

Pressure decay

Answer

Silt lock

Answer

Thermal expansion

Question 2

Which medium is primarily used in pneumatic systems to transmit force and motion?

Accepted Answer

Compressible gas, primarily compressed air

Answer

Water-glycol solution

Answer

Viscous lithium grease

Answer

Incompressible hydraulic oil

Question 3

Which tool should be used to loosen tight fasteners during valve disassembly to avoid damaging precision internal mechanisms?

Accepted Answer

Breaker bar

Answer

Torque wrench

Answer

Internal micrometer

Answer

Feeler gauge

Question 4

What fluid should ideally be applied to new seals and sliding spool lands prior to reassembling a hydraulic control valve?

Accepted Answer

Clean hydraulic fluid

Answer

Non-hydraulic engine oil

Answer

Solvent cleaner

Answer

Lithium grease

Question 5

Why is black the default color for most rubber O-rings used in fluid power applications?

Accepted Answer

Carbon black is added as an inexpensive reinforcing filler and UV protectant.

Answer

It signifies that the O-ring is made of silicone rubber.

Answer

It is the natural unrefined color of all synthetic elastomers.

Answer

It indicates that the seal is designed exclusively for high pressure.

Question 6

Why must valve end caps be disassembled in a controlled manner during maintenance?

Accepted Answer

To prevent internal springs and biased components from abruptly releasing mechanical energy

Answer

To avoid changing the radial clearance of the valve bore

Answer

To ensure the valve spool is permanently magnetized

Answer

To prevent hydraulic oil from turning into compressed air

Question 7

What safety hazard is present if hydraulic line fittings are loosened before relieving circuit pressure?

Accepted Answer

Injury caused by hot, high-pressure fluid spray

Answer

Spontaneous demagnetization of solenoid coils

Answer

Permanent warping of the cylinder piston rod

Answer

Immediate loss of electrical ground at the machine frame

Question 8

Is color a reliable, standardized method for identifying the elastomeric material of an O-ring?

Accepted Answer

No, color codes vary by manufacturer and are not a guaranteed material standard.

Answer

Yes, color codes are globally standardized across all manufacturers.

Answer

No, because all O-rings lose their color once installed in hydraulic oil.

Answer

Yes, blue always indicates nitrile rubber and green indicates fluorocarbon.

Question 9

What is the main advantage of lubricating rubber seals during installation?

Accepted Answer

It reduces insertion force and helps prevent surface damage.

Answer

It allows the technician to bypass proper mechanical alignment.

Answer

It permanently fuses the rubber seal to the metal gland surface.

Answer

It increases the shore hardness of the rubber polymer.

Question 10

In general mechanical installation, how do pneumatic systems compare to hydraulic systems regarding initial cost and maintenance?

Accepted Answer

Pneumatic systems are generally cheaper to install and require less maintenance.

Answer

Pneumatic systems require complex fluid filtration and frequent oil flushing.

Answer

Pneumatic systems are much more expensive to install and maintain.

Answer

Pneumatic systems always operate at higher pressures than hydraulic systems.

Inspect, troubleshoot, and replace seals in fluid power control valves and cylinders (ITI) Quiz, Fitter

What's Inside This Quiz

Keep Practicing