Millwright - 3rd Year - Troubleshooting and
Maintenance Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
1. Which system (open or closed 1. open loop
loop) discharges the main system
flow back to the reservoir?
2. Which system (open loop or 2. open loop
closed loop) is normally used in
stationary hydraulics applications?
3. What is the recommended size 3. two to three times the pump capacity
for
a reservoir in an open loop
system?
4. Where does the discharge from 4. directly to the pump inlet
the return line on a closed loop
system go?
5. If the return flow in a closed 5. from internal leakage and from the hot
loop oil shuttle
system goes directly to the pump out through the case drain to the cooler
inlet, how does the oil make its
way
to the cooler?
, 6. Why is backpressure required 6. to prevent the pistons from lifting off the
on swash
the return line in a closed loop plate or separating from their shoes
circuit that uses an axial piston
pump?
7. What are three functions of the 7. provide make-up flow to the main pump,
charge pump in a hydrostatic circulate case drain fluid to the cooler and
drive? provide
flow for the control circuit
8. What is the purpose of the hot 8. to divert part of the return flow to the
oil cooler
shuttle valve?
9. How are the torque and speed 9. The torque decreases and the speed
affected on a fixed displacement increases.
motor in a hydrostatic drive when
you increase the pump swash
plate
angle?
10. Which runs hotter, a closed 10. a closed loop circuit
loop
or an open loop circuit?
11. Which two electrical lockouts 11. pump power supply and control power
must you perform before you work supply
on a hydraulic system?
Maintenance Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
1. Which system (open or closed 1. open loop
loop) discharges the main system
flow back to the reservoir?
2. Which system (open loop or 2. open loop
closed loop) is normally used in
stationary hydraulics applications?
3. What is the recommended size 3. two to three times the pump capacity
for
a reservoir in an open loop
system?
4. Where does the discharge from 4. directly to the pump inlet
the return line on a closed loop
system go?
5. If the return flow in a closed 5. from internal leakage and from the hot
loop oil shuttle
system goes directly to the pump out through the case drain to the cooler
inlet, how does the oil make its
way
to the cooler?
, 6. Why is backpressure required 6. to prevent the pistons from lifting off the
on swash
the return line in a closed loop plate or separating from their shoes
circuit that uses an axial piston
pump?
7. What are three functions of the 7. provide make-up flow to the main pump,
charge pump in a hydrostatic circulate case drain fluid to the cooler and
drive? provide
flow for the control circuit
8. What is the purpose of the hot 8. to divert part of the return flow to the
oil cooler
shuttle valve?
9. How are the torque and speed 9. The torque decreases and the speed
affected on a fixed displacement increases.
motor in a hydrostatic drive when
you increase the pump swash
plate
angle?
10. Which runs hotter, a closed 10. a closed loop circuit
loop
or an open loop circuit?
11. Which two electrical lockouts 11. pump power supply and control power
must you perform before you work supply
on a hydraulic system?
