WorksheetsfinAL 2.5
Total questions: 25
Worksheet time: 13mins
Hardware instruments are classifi ed as ______ elements.
1
3
2
4
Choose the correct order of elements
transmitter - sensor - controller - final control element
sensor- controller - transmitter - final control element
sensor - transmitter - controller - final control element
final control element - sensor - transmitter - controller
The primary signal is usually obtained or converted in the form of ________ or _________.
force, current
electrical voltage, resistance
electrical voltage, current
resistance, current
Choose the temperature sensor:
Thermocouple
Strain gauge
Float gauge
Piezoelectric
Choose the input signal of electrical controller
Liqiud pressure
3–15 psi air
Current or digital
4–20 mA
What does the code name FIC stand for?
flow integral controller
flow indicating controller
flow indicating code
flow integral code
In the _______, a workstation with supervising computers are connected to the loop controllers, which are distributed throughout the process, each performing locally to control the respective control variables.
PLC
DCS
microprocessors
SCADA
The _______ is where the controller can be operated to change the SPs, record the PVs, tune the parameters of the controller, and have correcting signals delivered to the control valves.
distributed control system
controller
crude throughout control
control room
What parameters need to be controlled in the desalter control?
pressure, interface control
temperature, pressure
temperature, interface control
level, pressure, temperature
The coil outlet temperature of the furnace is controlled by a ___________ where the master controller gets its input signal from the thermocouple from the coil outlet fl uid and a slave controller manipulates the fuel to the furnace.
ratio control
batch control
feedforward control
cascade control
Cascade control is used when there are ________ measurements, but ______ control variable is available
more than two, less than two
more than one, only one
only one, more than one
two, only one
A ____________ is a device that translates a mechanical signal into an electrical
signal.
Actuator
Transmitters
Transducers
Controllers
Name the variable which directly or indirectly indicate the form or state of the product. e.g. temperature in a chemical reactor, outlet temperature of water in a water heater.
Controlled variable
Manipulated variable
None of them
Load variable
Name the variable which is selected for adjustment by the controller so as to maintain the controller variable at the desired value. Examples are cooling by changing cooling water flow rate of steam for heating in chemical reactors
Load variable
Controlled variable
Manipulated variable
None of them
Name the other independent variables except controlled and manipulated variables . For e.g. inlet concentration and temperature of reactors in a chemical reactor, inlet temperature of cooling water or cold water in water heater.
Manipulated variable
Controlled variable
Load variable
None of them
The ability to give same output reading when same input value applied repeatedly is known as …
Stability
Sensitivity
Repeatability
Accuracy
Choose the pressure sensor
Thermocouple
Strain gauge
Float gauge
Venturimeter
Choose the level sensor
Venturimeter
Strain gauge
Thermocouple
Float gauge
Choose the phenomenon of resistance temperature detector (RTD):
Resistance change of metallic conductor
Thermoelectric
Time variation with refl ected ultrasound wave
Variation of position of fl oating object
____ is defined as distortion in signal?
Wavelength
Noise
Frequency
Error
A final control elements is…
a human-readable device that displays information about the process.
22
a device that converts a reading from a sensor or transducer into a standard signal and transmits that signal to a monitor or controller.
the part of a final control device that causes a physical change in the final control device when signalled to do so.
the part of the control system that acts to physically change the manipulated variable
A controller is …
a human-readable device that displays information about the process.
the part of the control system that acts to physically change the manipulated variable.
a device that receives data from a measurement instrument, compares that data to a programmed setpoint, and, if necessary, signals a control element to take corrective action.
the part of a final control device that causes a physical change in the final control device when signalled to do so.
Strain gauge is…
Passive device and converts electrical displacement into a change of resistance
Active device and converts mechanical displacement into a change of resistance
Active device and converts electrical displacement into a change of resistance
Passive device and converts mechanical displacement into a change of resistance
Choose the correct arrangement of block diagram.
controller => FCE => process => sensor
FCE => process => controller => sensor
sensor => process => FCE => controller
process => FCE => sensor => controller
Please select one of the laws, that is used to describe the process use in the de-salter ?
Newton’s Law
Ideal Gas Law
Stoke’s Law
Mass conservation Law
