Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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The two types of relief valves used in hydraulic circuits are __________.
a. | directing acting and poppet | c. | integral and
needle | b. | pilot operated and bypass | d. | pilot operated and direct acting |
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2.
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The primary purpose of a relief valve is to ______________.
a. | control flow | c. | limit system pressure | b. | avoid pump
reversal | d. | hold pump
prime |
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3.
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The pressure at which the relief valve actually starts to open is called
___________.
a. | full flow pressure | c. | operating pressure | b. | cracking pressure | d. | downstream
pressure |
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4.
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Check valves are used in hydraulics to _________.
a. | control flow | c. | block flow | b. | control speed | d. | control system
pressure |
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5.
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The three types of check valves used in hydraulics are _______________.
a. | ball, bypass, spring | c. | ball, swing, poppet | b. | poppet, pilot, ball | d. | direct, swing,
bypass |
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6.
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A flow control valve is a combination of a ____________.
a. | relief and DCV | c. | needle valve and check valve | b. | check and a relief
valve | d. | DCV and a needle
valve |
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7.
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Which of the following is not a basic part of a flow control valve?
a. | Body | c. | Check valve poppet | b. | Adjustment knob | d. | Piston |
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8.
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If the load on an actuator is increased, the flow through a non-compensated flow
control valve controlling the actuator speed will _______________.
a. | decrease | c. | remain the same | b. | increase | d. | tripple |
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9.
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A meter-in flow control valve controls the speed of an actuator by
____________.
a. | applying back pressure to the actuator | c. | diverting flow to the
reservoir | b. | restricting the flow to the actuator | d. | restricting the flow from the
actuator |
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10.
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A meter-out flow control circuit __________.
a. | is used to control aiding loads | c. | is used to control opposing
loads | b. | builds back pressure at the actuator | d. | All of the
above |
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11.
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An independent speed control circuit may be needed with a double-acting cylinder
because ______________.
a. | aiding loads are present | c. | two speeds are needed during
extend | b. | equal extend and retract speeds are needed | d. | two different pressures are
needed |
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12.
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Switching between flow control valves is done in a multiple speed circuit using
a __________.
a. | relief valve | c. | directional control valve | b. | needle
valve | d. | check
valve |
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13.
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To calculate extend speed of a cylinder, you need to know ______________.
a. | rod diameter and flow rate in | c. | piston diameter and flow
rate | b. | rod length and piston diameter | d. | rod length, piston diameter, and rod
diameter |
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14.
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At a given flow rate, a cylinder retracts faster than it extends because
___________.
a. | the rod takes up space | c. | there is less volume to fill | b. | the annular area is
smaller than the piston area | d. | All of the above |
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15.
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The time for a cylinder to complete its stroke can be calculated if you know the
___________.
a. | volume of the cylinder and the input flow rate | c. | area of the piston and input flow
rate | b. | area of the piston and input pressure | d. | stroke length and input flow
rate |
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16.
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Relief valves allow flow to bypass the system and return to the
____________.
a. | atmosphere | c. | actuator | b. | pump | d. | reservoir |
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Matching
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Segment 1
a. | spring | d. | relief | b. | decreases | e. | direct-acting | c. | cracking | f. | limit |
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17.
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The primary purpose of a relief valve is to _________ system pressure.
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18.
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When using a needle valve to control speed, excess pump flow is directed over
the _______ valve.
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19.
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When operating in a flow control circuit, the speed of the actuator _________
when the flow throught the relief valve increases.
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20.
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The two types of relief valves are _________ and pilot-operated.
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21.
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Turning the adjustment knob on a relief valve changes the compression on the
___________.
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22.
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The ________ pressure is the point where the relief valve starts to
open.
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Segment 2
a. | bypass | d. | poppet | b. | one | e. | flow | c. | spring | f. | free
flow |
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23.
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The check valve is a(n) ________ way directional control valve.
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24.
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Check valves are used to hold prime, avoid pump reversal, ______, and provide
back pressure.
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25.
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The direction through a check valve that allows flow is called ___________
direction.
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26.
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The three types of check valves used in hydraulic systems are the ball, ______,
and swing types.
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27.
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The poppet type check valve uses a(n) _________ to hold the poppet on the
seat.
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28.
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A check valve is designed to provide _______ in one direction only.
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Segment 3
a. | relief | d. | free | b. | increase | e. | CW | c. | needle |
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29.
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The flow control valve is a(n) ________ valve and a(n) check valve in one
body.
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30.
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To decrease flow through a flow control valve, turn the adjuster in the ______
direction.
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31.
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In a circuite where a flow control valve controls cylinder speed, a drop in the
load will cause the cylinder to _______ speed.
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32.
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As controlled flow through a flow control valve increases, flow throug the
_________ valve decreases.
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33.
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Fluid entering the flow control valve in the __________ flow directions can
flow two ways.
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Segment 4
a. | opposing | d. | meter-out | b. | overrunning | e. | speed | c. | aiding | f. | into |
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34.
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_________ flow control circuits are used when the load is aiding or
over-running.
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35.
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Wither a meter-in or meter-out flow control circuit may be used when the load
is _________.
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36.
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Meter-out circuits control actuator speed will when the load is either ________
or opposing.
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37.
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A meter-in flow control circuit controls speed by controlling the amount of oil
going _________ the actuator.
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38.
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The meter-in circuit provides precise control and is a common method of
controlling ___________.
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39.
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Most motor speed circuits are meter-out because almost all motors have
_________ loads.
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Segment 5
a. | independent | d. | DCV | b. | productivity | e. | reset | c. | cap |
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40.
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The ________ speed control circuit uses separate flow control valves to control
the speed of an actuator in both directions.
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41.
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Multiple speed circuits may use flow control valves and _______ to switch
between them.
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42.
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A rapid traverse-slow feed circuit is used to increase machine
_________.
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43.
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Because the rod and ____ end areas are different in a double-acting cylinder,
extend and retract times are different.
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44.
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Retract stroke on a double-acting cylinder is done at high speed when it is
used to __________ the cylinder for the next cycle.
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Segment 6
a. | length | d. | faster | b. | volume | e. | rod | c. | increase |
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45.
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To calculate the annular area of a cylinder you must know the piston and
________ diameters.
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46.
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The extend speed of a cylinder depends on the entering flow rate and the
________ being filled.
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47.
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For a given flow rate, a double-acting cylinder will retract _______ than it
extends.
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48.
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To calculate cylinder stroke time, you need to know piston area, flow rate, and
stroke __________.
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49.
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For a given flow rate, increaseing the cylinder rod diameter will _________
retraction speed.
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