Hydraulics and Pneumatics Final UPDATED Exam Questions and CORRECT Answers
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Course
Hydraulics and Pneumatics
Institution
Hydraulics And Pneumatics
Hydraulics and Pneumatics Final
UPDATED Exam Questions and
CORRECT Answers
The vertical arrow across the flow path of a flow control valve indicates _____ _____. (IHL2
3-1) - CORRECT ANSWER- pressure-compensated
The pressure-compensated flow control valve provides a constant flow rate by kee...
Hydraulics and Pneumatics Final
UPDATED Exam Questions and
CORRECT Answers
The vertical arrow across the flow path of a flow control valve indicates _____ _____. (IHL2
3-1) - CORRECT ANSWER- pressure-compensated
The pressure-compensated flow control valve provides a constant flow rate by keeping the
needle valve's upstream and downstream pressure _____ _____. (IHL2 3-2) - CORRECT
ANSWER- differential constant
The spool that controls the pressure drop across the opening of the pressure-compensated
flow control valve is called the _____. (IHL2 3-3) - CORRECT ANSWER- compensator
A flow control valve that does not have a reverse flow check is called a _____ valve. (IHL2
3-4) - CORRECT ANSWER- needle
To decrease the flow through a flow control valve, turn the adjustment in the _____ direction.
(IHL2 3-5) - CORRECT ANSWER- clockwise
The best method for synchronizing cylinders is by using _____. (IHL2 4-1) - CORRECT
ANSWER- mechanical yoke
When two cylinders of the same size are connected in parallel, the one with the lightest load
will move _____. (IHL2 4-2) - CORRECT ANSWER- first
Synchronizing cylinders by placing the cylinders in series is done by using _____. (IHL2 4-3)
- CORRECT ANSWER- double-rod cylinders
As cylinders are cycled, the piston seals will wear, causing _____. (IHL2 4-4) - CORRECT
ANSWER- leakage
, Hydraulic cylinders operating at the same speed, or finishing their strokes at the same time,
are said to be _____. (IHL2 4-5) - CORRECT ANSWER- synchronized
When the discharge of one cylinder drives another cylinder, the _____ is equal to the
combined loads of both cylinders. (IHL2 4-6) - CORRECT ANSWER- pressure
The pilot-operated relief valve is also called a _____ relief valve. (IHL3 1-1) - CORRECT
ANSWER- 2-stage
The performance advantage that a pilot-operated relief valve has over the direct-acting relief
valve is the shorter pressure span between _____ and _____. (IHL3 1-2) - CORRECT
ANSWER- cracking, full flow
Flow through a pilot-operated relief valve is blocked by a spring biased _____. (IHL3 1-3) -
CORRECT ANSWER- spool
A pilot-operated relief valve opens when the inlet pressure becomes greater than the upper
_____ pressure and the spool _____. (IHL3 1-4) - CORRECT ANSWER- chamber, spring
The "pilot" of a pilot-operated relief valve is a _____ valve. (IHL3 1-5) - CORRECT
ANSWER- direct-operated
The vent port on a relief valve is also called the _____ port. (IHL3 2-1) - CORRECT
ANSWER- RC
Pilot-operated relief valves are usually vented using _____ DCVs. (IHL3 2-2) - CORRECT
ANSWER- small
Opening the vent port of a pilot-operated relief valve will cause system pressure to _____ to
_____. (IHL3 2-3) - CORRECT ANSWER- drop, minimum
Dripping the pump pressure during machine idle times is called _____. (IHL3 2-4) -
CORRECT ANSWER- unloading
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