Hydraulics and Pneumatics Quiz 2

The meter-in circuit provides precise control and is a common method of controlling _____. (HL4 4-5)

speed

The external drain of a PRV keeps oil pressure from building in the _____ chamber. (HL5 4-4)

spring

The poppet type check valve uses a _____ to hold the poppet on the seat. (HL4 2-5)

spring

Turning the adjustment knob on a relief valve changes the compression on the _____. (HL4 1-5)

spring

The three types of check valves used in hydraulic systems are the _____, _____, and _____ types. (HL4 2-4)

spring, ball, poppet

Detented valves have no _____, therefore remain in the last shifted position. (IHL1 3-3)

springs

Excessive bushing wear in long rod cylinders can be prevented with _____. (IHL2 1-4)

stop tubes

The 3-position DCV spool that drops off pump pressure, but holds the actuator in position, is called the _____ center. (IHL1 1-3)

tandum

The drain port of a PRV must always be connected directly to the 1 _____. (HL5 4-2)

tank

The cylinder type used when mounting space is limited is the _____ cylinder. (IHL2 1-2)

telescoping

The DCV used to control the movement of a unidirectional actuator is a _____ way, _____ position.(IHL1 2-1)

three, two

The rotameter flowmeter is also called a _____ flowmeter. (PL4 1-3)

variable orafice

A ram type cylinder is always mounted _____ and retracted by _____. (IHL2 1-3)

vertically, weight

The extend speed of a cylinder depends on the entering flow rate and the _____ being filled. (HL4 6-2)

volume

A DCV that is designated 4/3 has four _____ and three _____. (IHL1 1-2)

ways, positions

The free air flow rate of 2 CFM at 58.8 psig is _____ CFM. (PL4 1-5)

10

Two types of cam-operated valves are the _____ and _____ valves. (IHL1 4-4)

4-way DCVs, deceleration

The designation for a DCV that cycles a double-acting cylinder that does not need to stop, except in the off position is _____. (IHL1 2-3)

4/2

In the crossed arrows condition for a DCV, the P-port is connected to _____. (IHL1 2-5)

B-port

Larger air flow rates are usually specified as _____. (PL4 1-6)

CFM/CMM

Multiple speed circuits may use flow control valves and _____ to switch between them. (HL4 5-2)

DCV

_____ flow control circuits are used when the load is aiding or over-running. (HL4 4-1)

Meter-out

_____ port speed controls always provide a meter-in circuit. (PL4 3-7)

Pressure

SCFH means _____. (PL4 1-2)

Standard Cubic Feet per Hour

Pressure-reducing valves can be used in any application where the process requires one or more _____ to operate at pressures lower than the main circuit pressure. (HL5 4-5)

actuators

Meter-out circuits control actuator speed well when the load is either _____ or opposing. (HL4 4-3)

aiding

A meter-out circuit controls the speed of a cylinder by creating _____ on the piston. (PL4 3-5)

back pressure

The two common types of check valves used in pneumatics are _____ and _____. (PL4 2-2)

ball, poppet

Check valves are used to hold prime, avoid pump reversal, _____, and provide back pressure. (HL4 2-2)

bipass

Precise sequencing or speed changing can be done with a _____ valve. (IHL1 4-3)

cam-operated

Because the _____ and _____ end areas are different in a double-acting cylinder, extend and retract times are different. (HL4 5-4)

cap, rod

To prevent a PRV from blocking flow when flowing backwards through the valve, use a _____ valve. (HL5 4-3)

check

The flow control valve is a _____ valve and a _____ valve in one body. (HL4 3-1)

check, needle

An example of a two-sequence valve circuit would be a _____ and _____ circuit. (HL5 2-5)

clamp, drill

A trunnion mounted cylinder can be used in applications where the cylinder must rotate as it operated is the _____ mount. (IHL2 1-1)

clevis

To close a needle valve, turn the adjustment _____. (PL4 1-1)

clockwise

To decrease flow through a flow control valve, turn the adjuster in the _____ direction. (HL4 3-2)

clockwise

To increase the downstream pressure of a PRV, you turn the adjustment knob _____. (HL5 3-2)

clockwise

The 3-position DCV spool to use for holding a cylinder in position, yet provide full pump pressure to the rest of the circuit, is called the _____ center. (IHL1 1-5)

closed

The _____ pressure is the point where the relief valve starts to open. (HL4 1-6)

cracking

To slow cylinder movement near the end of the stroke, use a _____. (IHL2 1-6)

cylinder cushion

When operating in a flow control circuit, the speed of the actuator _____ when the flow through the relief valve increases. (HL4 1-3)

decreases

A _____ DCV requires only a momentary signal to shift. (IHL1 1-6)

detented

The two types of relief valves are _____ and pilot-operated. (HL4 1-4)

direct-acting

The cam-operated valve is considered to be a _____ valve. (IHL1 4-1)

directional control

For proper operation, a cam-operated four-way used in a three-way application must have the tank port connected _____ to the reservoir. (IHL1 4-5)

directly

The cylinder group that requires powering in both directions is called _____. (IHL2 1-8)

double acting

The pressure-reducing valve senses _____ pressure. (HL5 3-1)

downstream

Sequence valves are used to sequence two actuators to avoid the cost of an _____ control circuit. (HL5 1-2)

electrical

A sequence valve is actually a relief valve with an _____. (HL5 1-5)

external drain line

For a given flow rate, a double-acting cylinder will retract _____ than it extends. (HL4 6-3)

faster

A strong mounting is provided when cylinders loads are kept along the center line. The _____ mount allows for center line mounting. (IHL2 1-5)

flange

Foot-mounted cylinders are popular because they are easily attached to _____. (IHL2 1-7)

flat surfaces

The spool type used in the pilot valve to shift a 4/3 pilot-operated DCV is always a _____. (IHL1 3-5)

float

A check valve is designed to provide _____ in one direction only. (HL4 2-6)

flow

4/2 is a designation for a DCV that has _____ ways and _____ position. (IHL1 2-2)

four, two

Air entering the flow control valve in the _____ flow direction can flow two ways. (PL4 2-4)

free

Fluid entering the flow control valve in the _____ flow direction can flow two ways. (HL4 3-5)

free

The direction through a check valve that allows flow is called _____ direction. (HL4 2-3)

freeflow

Pilot-operated DCVs are used in _____ flow applications. (IHL1 3-2)

high

For a given flow rate, increasing the cylinder rod diameter will _____ retraction speed. (HL4 6-5)

increase

In a circuit where a flow control valve controls cylinder speed, a drop in the load will cause the cylinder to _____ speed. (HL4 3-3)

increase

The _____ speed control circuit uses separate flow control valves to control the speed of an actuator in both directions. (HL4 5-1)

independent

A bypass check built into the same body of a sequence valve is called an _____ check valve. (HL5 2-3)

integral

A meter-in flow control circuit controls speed by controlling the amount of air going _____ the actuator. (PL4 3-4)

into

A meter-in flow control circuit controls speed by controlling the amount of oil going _____ the actuator. (HL4 4-4)

into

Slow feed is usually necessary during the _____ part of the cylinder cycle. (IHL1 4-6)

last

To calculate cylinder stroke time, you need to know piston area, flow rate, and stroke _____. (HL4 6-4)

length

The primary purpose of a relief valve is to _____ system pressure. (HL4 1-1)

limit

The downstream pressure of a sequence valve depends on the _____. (HL5 1-3)

load

A blocked drain line of a sequence valve will cause the valve to _____. (HL5 2-1)

lock

The two common circuit methods for controlling the speed of an actuator are called _____ and _____. (PL4 3-3)

meter-in, meter-out

The flow control valve consists of a _____ valve and a _____ valve in one envelope or body. (PL4 2-1)

needle, check

The offset position is the _____ position for a 2-position valve. (IHL1 2-4)

neutral

Flowing backwards through a sequence valve without a bypass check is not possible because the valve is _____. (HL5 2-2)

normally closed

The check valve is a _____ way directional control valve. (HL4 2-1)

one

The check valve will allow flow in _____ direction. (PL4 2-5)

one

A spring holds the PRV in a normally _____ position. (HL5 3-3)

open

The 3-position DCV spool that has all ports connected in neutral is called _____ center. (IHL1 1-1)

open

The 3-position spool that drops off pump pressure to the lowest level is the _____ center. (IHL1 1-4)

open

A PRV is in the _____ position when the adjustment pressure setting is higher than system pressure. (HL5 3-5)

opened

A meter-out flow control circuit works well when the load is _____. (PL4 3-2)

opposing

Either a meter-in or meter-out flow control circuit may be used when the load is _____. (HL4 4-2)

opposing

Meter-_____ flow control circuits are used when the load s aiding or over-running. (PL4 3-1)

out

Most motor speed circuits are meter-out because almost all motors have _____ loads. (HL4 4-6)

overruning

The small valve used to power a larger valve is called the _____ valve. (IHL1 3-1)

pilot-operated

A PRV is used in multiple actuator circuits to reduce the _____ in one branch of the circuit. (HL5 3-4)

pressure

The drain is connected to the sequence valve's spring chamber to keep the _____ out. (HL5 1-4)

pressure

The sequence valve depends on an actuator to stop and block flow so that _____ rises to open it. (HL5 1-1)

pressure

The simplified symbol for a 4/2, pilot-operated DCV, offset P to A shows that either or both _____ and _____ holding the valve offset. (IHL1 3-4)

pressure, spring

A rapid traverse-slow feed circuit is used to increase machine _____. (HL4 5-3)

productivity

A sequence valve may be used as a _____ valve. (HL5 2-4)

relief

As controlled flow through a flow control valve increases, flow through the _____ valve decreases. (HL4 3-4)

relief

When using a needle valve to control speed, excess pump flow is directed over the _____ valve. (HL4 1-2)

relief

Retract stroke on a double-acting cylinder is done at high speed when it is used to _____ the cylinder or the next cycle. (HL4 5-5)

reset

The needle valve controls the flow rate by providing a _____. (PL4 1-4)

restriction

Downstream pressure will _____ if the external drain of a PRV is blocked. (HL5 4-1)

rise

To calculate the annular area of a cylinder you must know the piston and _____ diameters. (HL4 6-1)

rod

Another name for a cam-operated is the _____ valve. (IHL1 4-2)

roller-operated

The _____ relieving feature of a PRV allows excess downstream pressure to bleed off through the drain port. (HL5 3-6)

self