Process Control and Analysis

24問 • 3ヶ月前

ユーザ名非公開

通報

問題一覧

Which of the following terms correctly represents transient nature of a process?

unsteady state

Which of the following conservation balancing equations is required for modelling a heater system?

heat and mass balance

Which of the following correctly represent the components of a control system?

process, measuring element, controller and final control element

What variables should we measure in order to monitor the operational performance of a plant?

the variables that represent our control objectives

How is the information, taken from the measurements, used to adjust the values of the manipulated variables?

control law

The input variables can be classified into

manipulated variable and disturbances

The output variables can be classified into

measured and unmeasured variables

Under what circumstances does an open control loop exist?

process variable is not measured

Identify which of the following is/are primary element/sensors process control?

resistance temperature detectors

A ________ is a dev8ce that translates a mechanical signal into an electrical signal

transducer

A ________ is a device that converts a reading from a transducer into a standard signal and transmits that signal to a monitor or controller

transmitter

Which of the following have the ability to receive input, to perform a mathematical function with the input, and produce an output signal?

controllers

Which of the following is the most common final control element in process control industries,

valve

A part of final control device that causes a physical change in the final control device when signaled to do so

actuator

Transfer function is

ratio of Laplace transform of the output to Laplace transform of the input with zero initial conditions

The ________ process are characterised by: • Their capacity to store material, energy or momentum • The resistance associated with the flow of mass, energy or momentum in reading the capacity

first order

Non interacting capacities always result in an ________ or ________.

overdamped, critically damped

The response of interacting capacities is always

overdamped

The overall response of interacting capacities are more ________ than the noninteracting capacities

sluggish

When a valve is installed in a process with where the differential pressure (drop) across the valve decreases with increasing flow, the best trim characteristic to choose for the valve would be

equal percentage

The main purpose of a control valve positioned is to:

improve the precision of the valve

The purpose of valve packing is to

seal process fluid from escaping past the stem

Cavitation in a control valve is caused by

pressure recovery

The proper fail safe status of a valve should always be dictated by

nature of the process

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72問 • 3ヶ月前

ユーザ名非公開

問題一覧

Which of the following terms correctly represents transient nature of a process?

unsteady state

Which of the following conservation balancing equations is required for modelling a heater system?

heat and mass balance

Which of the following correctly represent the components of a control system?

process, measuring element, controller and final control element

What variables should we measure in order to monitor the operational performance of a plant?

the variables that represent our control objectives

How is the information, taken from the measurements, used to adjust the values of the manipulated variables?

control law

The input variables can be classified into

manipulated variable and disturbances

The output variables can be classified into

measured and unmeasured variables

Under what circumstances does an open control loop exist?

process variable is not measured

Identify which of the following is/are primary element/sensors process control?

resistance temperature detectors

A ________ is a dev8ce that translates a mechanical signal into an electrical signal

transducer

A ________ is a device that converts a reading from a transducer into a standard signal and transmits that signal to a monitor or controller

transmitter

Which of the following have the ability to receive input, to perform a mathematical function with the input, and produce an output signal?

controllers

Which of the following is the most common final control element in process control industries,

valve

A part of final control device that causes a physical change in the final control device when signaled to do so

actuator

Transfer function is

ratio of Laplace transform of the output to Laplace transform of the input with zero initial conditions

The ________ process are characterised by: • Their capacity to store material, energy or momentum • The resistance associated with the flow of mass, energy or momentum in reading the capacity

first order

Non interacting capacities always result in an ________ or ________.

overdamped, critically damped

The response of interacting capacities is always

overdamped

The overall response of interacting capacities are more ________ than the noninteracting capacities

sluggish

When a valve is installed in a process with where the differential pressure (drop) across the valve decreases with increasing flow, the best trim characteristic to choose for the valve would be

equal percentage

The main purpose of a control valve positioned is to:

improve the precision of the valve

The purpose of valve packing is to

seal process fluid from escaping past the stem

Cavitation in a control valve is caused by

pressure recovery

The proper fail safe status of a valve should always be dictated by

nature of the process