MILLWRIGHT – HYDRAULICS EXAM
QUESTIONS WITH ANSWERS 100%
VERIFIED/DETAILED ALL ANSWERS
CORRECT LATEST UPDATED 2024/2025
BEST RATED TO SCORE A+ FOR SUCCESS
What is pressure defined as? - CORRECT ANSWERS Force per unit area F=(P)(A)
This pressure gauge has a calibrated dial face with a pointer attached through linkage to a
plunger and a bias spring. This system pressure is connected to the gauge and acts on the
plunger.
a. bourdon tube
b. siphon
c. flow meter
d. schrader gauge - CORRECT ANSWERS d. schrader gauge
What job does a flow control valve perform in a hydraulic system? - CORRECT ANSWERS
Controls the volume of fluid entering a port of the system to vary the speed
This is used in a hydraulic circuit as petroleum based liquid with 40% water content which
acts as oil
a. petroleum based oil
b. invert emulsions
c. glycol
d. vegtetable oils - CORRECT ANSWERS b. invert emulsion fluids
This is used as a fluid in a hydraulic circuit when there is extreme high and low temperature
ranges
a. petroleum based oil
b. invert emulsions
c. glycol
d. synthesized hydrocarbons - CORRECT ANSWERS d. synthesized hydrocarbons
,MILLWRIGHT – HYDRAULICS EXAM
QUESTIONS WITH ANSWERS 100%
VERIFIED/DETAILED ALL ANSWERS
CORRECT LATEST UPDATED 2024/2025
BEST RATED TO SCORE A+ FOR SUCCESS
You would use this valve if a large amount of fluid is to be relieved under a small pressure
differential
a. PRV
b. sequencing valve
c. pilot operated relief vavle
d. unloading valve - CORRECT ANSWERS c. pilot operated relief vavle
This is a NC valve
What is the purpose of a relief valve in a hydraulic system? - CORRECT ANSWERS It limits the
maximum pressure in the system
Maintains maximum system pressure
Safety as well for system not over pressurizing
List four (4) purposes that hydraulic fluid serve in a hydraulic system. - CORRECT ANSWERS
a) Power transmission
b) Cooling
c) Sealing
d) Lubrication
Describe cavitations and list four (4) causes of this problem.
, MILLWRIGHT – HYDRAULICS EXAM
QUESTIONS WITH ANSWERS 100%
VERIFIED/DETAILED ALL ANSWERS
CORRECT LATEST UPDATED 2024/2025
BEST RATED TO SCORE A+ FOR SUCCESS
1) Inlet not large enough
2) Plugged strainer
3) Viscosity too high
4) Too low operating temps or high operating temperatures
5) Over speed
6) Leaking system lines - CORRECT ANSWERS Cavitation is caused by restricted flow to the
suction side of pump. When oil is under pressure on discharge side of pump, the air bubbles
will implode.
This is a NC 2 way valve. It has a pilot lint that senses the pressure of the inlet port and a line
that drains the spring chamber back to reservoir (external drain)
a. PRV
b. sequencing valve
c. pilot operated relief vavle
d. unloading valve - CORRECT ANSWERS b. sequencing valve
How are oil filters used in hydraulic systems and rated?
By there micron rate
Beta ratio - CORRECT ANSWERS By there micron rate
QUESTIONS WITH ANSWERS 100%
VERIFIED/DETAILED ALL ANSWERS
CORRECT LATEST UPDATED 2024/2025
BEST RATED TO SCORE A+ FOR SUCCESS
What is pressure defined as? - CORRECT ANSWERS Force per unit area F=(P)(A)
This pressure gauge has a calibrated dial face with a pointer attached through linkage to a
plunger and a bias spring. This system pressure is connected to the gauge and acts on the
plunger.
a. bourdon tube
b. siphon
c. flow meter
d. schrader gauge - CORRECT ANSWERS d. schrader gauge
What job does a flow control valve perform in a hydraulic system? - CORRECT ANSWERS
Controls the volume of fluid entering a port of the system to vary the speed
This is used in a hydraulic circuit as petroleum based liquid with 40% water content which
acts as oil
a. petroleum based oil
b. invert emulsions
c. glycol
d. vegtetable oils - CORRECT ANSWERS b. invert emulsion fluids
This is used as a fluid in a hydraulic circuit when there is extreme high and low temperature
ranges
a. petroleum based oil
b. invert emulsions
c. glycol
d. synthesized hydrocarbons - CORRECT ANSWERS d. synthesized hydrocarbons
,MILLWRIGHT – HYDRAULICS EXAM
QUESTIONS WITH ANSWERS 100%
VERIFIED/DETAILED ALL ANSWERS
CORRECT LATEST UPDATED 2024/2025
BEST RATED TO SCORE A+ FOR SUCCESS
You would use this valve if a large amount of fluid is to be relieved under a small pressure
differential
a. PRV
b. sequencing valve
c. pilot operated relief vavle
d. unloading valve - CORRECT ANSWERS c. pilot operated relief vavle
This is a NC valve
What is the purpose of a relief valve in a hydraulic system? - CORRECT ANSWERS It limits the
maximum pressure in the system
Maintains maximum system pressure
Safety as well for system not over pressurizing
List four (4) purposes that hydraulic fluid serve in a hydraulic system. - CORRECT ANSWERS
a) Power transmission
b) Cooling
c) Sealing
d) Lubrication
Describe cavitations and list four (4) causes of this problem.
, MILLWRIGHT – HYDRAULICS EXAM
QUESTIONS WITH ANSWERS 100%
VERIFIED/DETAILED ALL ANSWERS
CORRECT LATEST UPDATED 2024/2025
BEST RATED TO SCORE A+ FOR SUCCESS
1) Inlet not large enough
2) Plugged strainer
3) Viscosity too high
4) Too low operating temps or high operating temperatures
5) Over speed
6) Leaking system lines - CORRECT ANSWERS Cavitation is caused by restricted flow to the
suction side of pump. When oil is under pressure on discharge side of pump, the air bubbles
will implode.
This is a NC 2 way valve. It has a pilot lint that senses the pressure of the inlet port and a line
that drains the spring chamber back to reservoir (external drain)
a. PRV
b. sequencing valve
c. pilot operated relief vavle
d. unloading valve - CORRECT ANSWERS b. sequencing valve
How are oil filters used in hydraulic systems and rated?
By there micron rate
Beta ratio - CORRECT ANSWERS By there micron rate
