PTEC 132 - Exam 5 - Spring 14 - Chapter 11
In physics, we get to understand how different tools and machines have various tools function. A valve acts a way to control entry or exit if a substance. This is a PTEC 132 - Exam 5 - Spring 14 – Chapter 11. Why don’t you give it a try and get to review some of the things that may be covered in the upcoming exam? All the best!
- 1.During a power failure, you want a valve that is adding material to a tank to stop flowing. Therefore, you would want the valve to be a/an
- A.
Air-to-open valve.
- B.
Air-to-close valve.
- C.
Fail-in-place.
- D.
It doesn’t matter, the power is off.
- 2.A/an _______ is a device that reacts to an instrument signal by creating linear or rotational motion.
- A.
Modulator
- B.
Agitator
- C.
Controller
- D.
Actuator
- 3._____________ provide excellent modular control with or without a positioner.
- A.
Cylinder type actuators
- B.
Control valve actuators
- C.
Dual positioner thrusters
- D.
Spring and diaphragm actuators
- 4.If a control valve and its spring and diaphragm actuator are both direct acting, then it will __________ if air is lost to it.
- A.
Fail open
- B.
fail closed
- C.
fail intermediate
- D.
Fail in the last position
- 5.A valve positioner can do which of the following:
- A.
Position the valve stem in reference to the instrument signal.
- B.
Reverse the direction of flow through the valve.
- C.
Reverse the action of the signal received from the controller.
- D.
Both a and b
- E.
. Both a and c
- 6.The three pressure gauges on a pneumatic valve positioner are:
- A.
Signal, Output and Supply
- B.
Signal, Input and Supply
- C.
Input, Output and Valve
- D.
Input, Output and Position
- 7.A controller’s output signal can be reversed by
- A.
An I/P transducer.
- B.
reversing the lead wires.
- C.
the valve positioner.
- D.
Both a and b
- 8.In the processing industry, the most common control valve body style in theButterfly.
- A.
Butterfly.
- B.
Three-Way.
- C.
Globe
- D.
Double-port .
- 9.An I/P or valve positioner will reverse an increasing signal from the __________ to a decreasing signal to the __________ __________.
- A.
Controller, control valve
- B.
System, actuator device
- C.
Damper, motor drive
- D.
spring, fail safe
- 10.Which of the following is considered to be the device that directly controls the manipulated variable.
- A.
The measuring element
- B.
The transmitting elemen
- C.
The comparing and controlling element
- D.
The final control element
- 11.The _________ is the device that provides motion to the valve.
- A.
Spring
- B.
Bonnet
- C.
Body
- D.
Actuator
- 12.The stem on a control valve that is sticking will ________ rather than move smoothly.
- A.
Jump
- B.
twist
- C.
Pivot
- D.
Bend
- 13.A control valve with a spring and diaphragm actuator is said to air-to-close, if there is a power loss (loss of actuating energy) the valve will:
- A.
be forced completely closed by the spring.
- B.
Be forced completely open by the spring.
- C.
remain in its last position.
- D.
Hunt for the best option.
- 14.Actuators and valves are either direct acting or ______________ acting.
- A.
Forward
- B.
Reverse
- 15.The tag on a pneumatically actuated control valve identifies it as air-to-open. If the positioner has been configured (set) to reverse the signal, then the valve will fail _________.
- A.
Closed
- B.
Open
- C.
In last state
- 16.A butterfly valve is opened with a _________ _________.
- A.
rotary motion
- B.
Sliding motion
- 17.A double acting cylinder type actuator always requires a positioner.
- A.
True
- B.
False
- 18.If a spring and diaphragm actuator loses air it will be forced into its fail-safe position.
- A.
True
- B.
False
- 19.A valve positioned is used to do all of the following except:
- A.
Provide split range control
- B.
Position the valve
- C.
Mimic a valve trim type
- D.
Reverse the action
- E.
Send a signal back to the controller
- 20.A tag with the label ATC/atc, the ATC represents the _________and the atc represents the ________.
- A.
Positioner, valve
- B.
Actuator, valve
- C.
Valve, positioner
- D.
Valve, actuator
- 21.An actuator accessory used to manually override the actuator or to limit its motion is called a _______.
- A.
switch
- B.
Handwheel
- C.
manual valve
- D.
Manual actuator
- 22.The top portion of the valve that connects the valve to the actuator and can be removed to allow entry into the valve body cavity is called a ___________.
- A.
Spring
- B.
Bonnet
- C.
Seat
- D.
Actuator
- 23.The pushing rod that transfers the motion of the actuator to the valve plug is called a ___________.
- A.
Spring
- B.
Bonnet
- C.
Stem
- D.
Actuator
- 24.The stationary part of the valve trim connected to the body comes in contact with the valve plug is called the __________.
- A.
Actuator
- B.
Bonnet
- C.
Spring
- D.
Seat
- 25.
![What do these symbols represent?
- ProProfs]( "What do these symbols represent?")
What do these symbols represent?- A.
Pressure reducing regulator
- B.
Back pressure regulator
- C.
Reverse valve positioner
- D.
Forward valve positioner
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