Millwright - 3rd Year - Introduction to
Hydraulics Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
1. What is the main hazard to 1. high pressure
always
be aware of when you are working
on hydraulic systems?
2. What hazard can exist after a 1. The system can still be charged with
hydraulic system has been locked high-
out? pressure fluid.
3. What is the safety reason for 1. so you can isolate and depressurize the
taking part of
time to completely understand a the system on which you will be working
hydraulic system before you begin
work on it?
4. Does a hydraulic system 1. b) no
develop
power?
a) yes
b) no
5. List the five main parts of a 1. reservoir, conductors, pump, control
hydraulic system. valves,
actuators
,6. What is the first main valve after 1. the maximum pressure relief valve
the pump in a hydraulic system?
7. What are the three functions of 1. to protect the system from overload; to
a divert
maximum pressure relief valve? 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 1. normally open
normally open or closed?
1. What is the purpose of a 1. to allow an actuator to operate only after
sequence another
valve? actuator has completed its cycle
1. What valve would you use to 1. a counterbalance valve
prevent the uncontrolled fall of a
load due to gravity?
1. Why is it important to attach an 1. to prevent the valve from locking up
external drain to a sequence valve under load
or
to a pressure-reducing valve?
What is the purpose of a flow 1. to control the speed of the actuator
control?
, 1. Name three types of flow 1. meter in, meter out and bleed-off
controls.
1. Which type of flow control is the 1. the bleed-off control
most energy efficient?
1. What is the purpose of cross 1. to protect the motor against shock
port loads,
relief valves on a hydraulic motor? especially when suddenly shifting from
forward to
reverse
1. What is pressure? 1. Pressure is force on a unit of area.
1. When pressure is applied to a 1. It is distributed equally to all parts of the
fluid system.
that is at rest and confined in a
system, is this pressure distributed
equally throughout all parts of the
system or is it concentrated in
some
parts of the system?
1. If a pump delivers flow through 1. zero at all points.
an
open-ended pipe that has no
restriction to the flow, is the
pressure
at any point in the pipe high, low or
zero?
Hydraulics Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
1. What is the main hazard to 1. high pressure
always
be aware of when you are working
on hydraulic systems?
2. What hazard can exist after a 1. The system can still be charged with
hydraulic system has been locked high-
out? pressure fluid.
3. What is the safety reason for 1. so you can isolate and depressurize the
taking part of
time to completely understand a the system on which you will be working
hydraulic system before you begin
work on it?
4. Does a hydraulic system 1. b) no
develop
power?
a) yes
b) no
5. List the five main parts of a 1. reservoir, conductors, pump, control
hydraulic system. valves,
actuators
,6. What is the first main valve after 1. the maximum pressure relief valve
the pump in a hydraulic system?
7. What are the three functions of 1. to protect the system from overload; to
a divert
maximum pressure relief valve? 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 1. normally open
normally open or closed?
1. What is the purpose of a 1. to allow an actuator to operate only after
sequence another
valve? actuator has completed its cycle
1. What valve would you use to 1. a counterbalance valve
prevent the uncontrolled fall of a
load due to gravity?
1. Why is it important to attach an 1. to prevent the valve from locking up
external drain to a sequence valve under load
or
to a pressure-reducing valve?
What is the purpose of a flow 1. to control the speed of the actuator
control?
, 1. Name three types of flow 1. meter in, meter out and bleed-off
controls.
1. Which type of flow control is the 1. the bleed-off control
most energy efficient?
1. What is the purpose of cross 1. to protect the motor against shock
port loads,
relief valves on a hydraulic motor? especially when suddenly shifting from
forward to
reverse
1. What is pressure? 1. Pressure is force on a unit of area.
1. When pressure is applied to a 1. It is distributed equally to all parts of the
fluid system.
that is at rest and confined in a
system, is this pressure distributed
equally throughout all parts of the
system or is it concentrated in
some
parts of the system?
1. If a pump delivers flow through 1. zero at all points.
an
open-ended pipe that has no
restriction to the flow, is the
pressure
at any point in the pipe high, low or
zero?
