PTEC 132 - Exam 5 - Spring 14 - Chapter 11

30 Questions | By Cstevenson_ladel | Updated: Mar 21, 2022 | Attempts: 578

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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!

Questions and Answers

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?
- A.
  
  Pressure reducing regulator
- B.
  
  Back pressure regulator
- C.
  
  Reverse valve positioner
- D.
  
  Forward valve positioner