Millwright - 3rd Year - Introduction to
Hydraulics Exam Questions and Answers
100% score Latest update 2026
1. What is the main hazard to always be aware of when you are
working on hydraulic systems? -
correct answer ✅1. high pressure
2. What hazard can exist after a hydraulic system has been locked
out? -
correct answer ✅1. The system can still be charged with high-
pressure fluid.
3. What is the safety reason for taking time to completely
understand a hydraulic system before you begin work on it? -
correct answer ✅1. so you can isolate and depressurize the part of
the system on which you will be working
4. Does a hydraulic system develop power?
a) yes
b) no -
correct answer ✅1. b) no
,Millwright - 3rd Year - Introduction to
Hydraulics Exam Questions and Answers
100% score Latest update 2026
5. List the five main parts of a hydraulic system. -
correct answer ✅1. reservoir, conductors, pump, control valves,
actuators
6. What is the first main valve after the pump in a hydraulic system?
-
correct answer ✅1. the maximum pressure relief valve
7. What are the three functions of a maximum pressure relief
valve? -
correct answer ✅1. to protect the system from overload; to divert
excess fluid not required by the actuator back to the tank; and to
set the maximum operating pressure in the system
1. Is a pressure-reducing valve normally open or closed? -
correct answer ✅1. normally open
1. What is the purpose of a sequence valve? -
correct answer ✅1. to allow an actuator to operate only after
another actuator has completed its cycle
, Millwright - 3rd Year - Introduction to
Hydraulics Exam Questions and Answers
100% score Latest update 2026
1. What valve would you use to prevent the uncontrolled fall of a
load due to gravity? -
correct answer ✅1. a counterbalance valve
1. Why is it important to attach an external drain to a sequence
valve or to a pressure-reducing valve? -
correct answer ✅1. to prevent the valve from locking up under
load
What is the purpose of a flow control? -
correct answer ✅1. to control the speed of the actuator
1. Name three types of flow controls. -
correct answer ✅1. meter in, meter out and bleed-off
1. Which type of flow control is the most energy efficient? -
correct answer ✅1. the bleed-off control
1. What is the purpose of cross port relief valves on a hydraulic
motor? -
Hydraulics Exam Questions and Answers
100% score Latest update 2026
1. What is the main hazard to always be aware of when you are
working on hydraulic systems? -
correct answer ✅1. high pressure
2. What hazard can exist after a hydraulic system has been locked
out? -
correct answer ✅1. The system can still be charged with high-
pressure fluid.
3. What is the safety reason for taking time to completely
understand a hydraulic system before you begin work on it? -
correct answer ✅1. so you can isolate and depressurize the part of
the system on which you will be working
4. Does a hydraulic system develop power?
a) yes
b) no -
correct answer ✅1. b) no
,Millwright - 3rd Year - Introduction to
Hydraulics Exam Questions and Answers
100% score Latest update 2026
5. List the five main parts of a hydraulic system. -
correct answer ✅1. reservoir, conductors, pump, control valves,
actuators
6. What is the first main valve after the pump in a hydraulic system?
-
correct answer ✅1. the maximum pressure relief valve
7. What are the three functions of a maximum pressure relief
valve? -
correct answer ✅1. to protect the system from overload; to divert
excess fluid not required by the actuator back to the tank; and to
set the maximum operating pressure in the system
1. Is a pressure-reducing valve normally open or closed? -
correct answer ✅1. normally open
1. What is the purpose of a sequence valve? -
correct answer ✅1. to allow an actuator to operate only after
another actuator has completed its cycle
, Millwright - 3rd Year - Introduction to
Hydraulics Exam Questions and Answers
100% score Latest update 2026
1. What valve would you use to prevent the uncontrolled fall of a
load due to gravity? -
correct answer ✅1. a counterbalance valve
1. Why is it important to attach an external drain to a sequence
valve or to a pressure-reducing valve? -
correct answer ✅1. to prevent the valve from locking up under
load
What is the purpose of a flow control? -
correct answer ✅1. to control the speed of the actuator
1. Name three types of flow controls. -
correct answer ✅1. meter in, meter out and bleed-off
1. Which type of flow control is the most energy efficient? -
correct answer ✅1. the bleed-off control
1. What is the purpose of cross port relief valves on a hydraulic
motor? -
