Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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The function of a needle valve in a pneumatic circuit is to
________________.
a. | regulate pressure | c. | measure flow rate | b. | block flow in one direction | d. | control air
flow |
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2.
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The control of the air flow in a pneumatic needle valve is accomplished by
_____________.
a. | the inlet port | c. | the adjustment screw | b. | the outlet port | d. | the size of the
orifice |
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3.
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The flow rate of air is the amount of air that passes through a system
____________.
a. | in a certain amount of time | c. | and is not returned to the
atmosphere | b. | at a given temperature | d. | before the compressor is started |
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4.
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The function of a flowmeter for industrial requirements is often
____________.
a. | to verify air flow and performance of both old and new components | c. | to verify that the
atmospheric conditions will allow the system to function | b. | to check the change
in pressure across a valve | d. | All of the above |
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5.
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The way to read a rotameter is to read the scale _________________.
a. | top of the ball | c. | bottom of the ball | b. | center of the ball | d. | None of the
above |
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6.
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A check valve is considered to be a(n) _____________________.
a. | pressure regulator | c. | actuator | b. | directional control | d. | operator |
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7.
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Two common types of check valves used in pneumatics are the
______________.
a. | spool and sleeve | c. | radial and axial | b. | vane and rotor | d. | ball and poppet |
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8.
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A pneumatic flow control valve is a combination of a ______________.
a. | flow meter and check valve | c. | needle valve and a check
valve | b. | DCV and check valve | d. | needle valve and a restrictor valve |
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9.
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Which of the following is not a part of a flow control valve?
a. | Body | c. | Adjustment screw | b. | Vane | d. | Check valve |
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10.
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If the load on an actuator is changed, the pressure required to move the load
will _______________.
a. | also change | c. | compensate the DCV | b. | remain the same | d. | cause the vane to
stall |
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11.
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A meter-in flow control circuit controls the fluid _________________.
a. | entering the actuator | c. | allowed in the room | b. | leaving the actuator | d. | based on temperature
changes |
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12.
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A meter-out flow control circuit controls the speed of an actuator by
_______________.
a. | applying back pressure to the actuator | c. | exhausting excess
air | b. | restricting the air flow to the actuator | d. | reducing the
supply |
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13.
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The placing of a needle valve or a flow control valve in the exhause port of a
DCV will make the circuit a ________________________.
a. | meter-out application | c. | higher speed application | b. | meter-in
application | d. | higher pressure
application |
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14.
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The placing of a needle valve or a flow control valve in the pressure port of a
DCV will make the circuit a __________________.
a. | meter-out application | c. | higher speed application | b. | meter-in
application | d. | higher pressure
application |
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15.
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An independent speed control circuit may be needed with a double-acting cylinder
because ______________.
a. | two speeds are needed during retract | c. | identical extend and retract speeds
are needed | b. | aiding loads are present | d. | the supply pressure varies |
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Matching
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Segment 1
a. | restriction | d. | variable
orifice | b. | 10 | e. | Standard
Cubic Feet per Hour | c. | CFM/CMM | f. | CW |
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16.
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To close a needle valve, turn the adjustment ___________.
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17.
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SCFH means __________________________.
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18.
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The rotameter is also called a(n) ___________ flow meter.
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19.
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The needle valve controls the flow rate by providing a(n) ____________.
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20.
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The free air flow rate of 2 CFM at 58.8 psig is ___________ CFM.
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21.
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Larger air flow rates are usually specified as __________.
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Segment 2
a. | one | d. | ball ; poppet | b. | needle;
check | e. | free | c. | increase |
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22.
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The flow control valve consists of a(n) _____________ valve and a(n)
____________ valve in one envelope or body.
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23.
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The two common types of check valves used in pneumatic are ________ and
_____________.
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24.
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In a circuit where a flow control valve controls cylinder speed, a drop in the
load will cause the cylinder to _______________ speed.
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25.
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Air entering the flow control valve in the __________ flow direction can flow
two ways.
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26.
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The check valve will allow flow in __________ direction(s)
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Segment 3
a. | opposing | e. | independent | b. | back pressure | f. | into | c. | meter-in;
meter-out | g. | out | d. | Pressure |
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27.
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Meter-__________ flow control circuits are used when the load is aiding or
over-running.
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28.
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A meter-out flow control circuit works well when the load is
__________.
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29.
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The two common circuit methods for controlling the speed of an actuator are
called ___________ and ___________.
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30.
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A meter-in flow control circuit controls speed by controlling the amoun of air
going _________ the actuator.
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31.
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A meter-out circuit controls the speed of a cylinder by creating ___________ on
the piston.
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32.
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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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33.
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____________ port speed controls always provide a meter-in circuit
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