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WorksheetsCONTROL SYSTEM UNIT 4
Total questions: 26
Worksheet time: 13mins
What is the Purpose of Feed Forward Control?
eliminate the need for feedback control in a process
reduce the effect of load variation on the process variable
save energy
reduce the effect of process variable noise on stability
What is a process control system?
system to keep the parameters at zero value
system to maintain the parameters constant
system to keep the parameters at highest value
system to check the voltage
What is the Objective of Process Control ?
to control physical parameters
to control mechanical parameters
to control optical parameters
to control electrical parameters
What is the purpose of feed back control?
To reduce magnitude of error
To increase efficiency
To minimize the gain
To reduce the effect of load
What is the name of device which operates automatically to regulate a controlled variable?
Transmitter
Controller
Feedback element
sensor
The algebric difference between the real value and ideal value of the measured signal is called____________
Error
manipulate variable
controlled variable
dynamic variable
Which of the following type of function in adaptive control is used to determine the current performance of the system?
Identification
Decision
modification
Index of performance
Which of the following type of function in adaptive control is used to adjust the control mechanism to improve the process performance?
Identification
Decision
modification
Index of performance
Which of the following type of function in adaptive control is decided to change the system parameters and variables?
Identification
Decision
modification
Index of performance
What is the type of feed back control in which internal unit of machining variables automatically adopt themselves to the actual conditions of the machining process?
Cascade control
feedforward control
Adaptive control
On-Off control
What are three elements used in boiler feedwater control system?
Feedwater flow, water conductivity, and steam flow
Drum level, water pH, and drum temperature
Steam flow, drum level, and feedwater flow
Turbidity, feedwater flow, and temperature
Why water is used in boilers?
to generate Power
to generate Electricity
to generate Steam
to generate current
Which of the following should not be a composition of boiler-feed water?
Hardness should be below 0.2ppm
Its caustic alkalinity should lie between 0.15 to 0.45 ppm
Its soda alkalinity should be 0.45-1 ppm
Its caustic alkalinity should be 1.5-2 ppm
Which of the following water is fit for use in boilers to operate efficiently?
conditioned water
Normal water
Makeup water
Hot water
What is the type of operation used in the boiled to remove the accumulation of impurities at the bottom of the boiler ?
Blowdown
Pretreatment
Post treatment
Feedwater control
What is control variable in boiler drum level control?
height of the water
quantity of the water
flow of water
heating
What will be the effect of changes if feed pressure is decreased in the Boiler?
changes in the volume of feed water
changes in the flow of feed water
changes in the height feed water
changes in the heating effect of feed water
What is the objective of the Combution control in Boiler?
to maintain Air fuel ratio
to main fuel rate
To minimize the air flow rate
to maintain the level of fuel
What is the device integrated inside the boiler to measure the steam inside the boiler?
Pressure transmitter
Flow transmitter
Level transmitter
sensor
What is the Purpose of integrating Pressure transmitter inside the boiler?
To measure the steam
To measure the amount of water
To measure the level of water
To measure the flow rate of water
The output of one controller is given to the setpoint for another controller is called___________
cascade control
feedforward control
feedback control
adaptive control
What is the main objective of computer based measurement and control?
acquire the information from field devices
compute a logical decision to manipulate the material
to get optimal output
all of the above
in which process control the sequence of one or more steps that should be performed in a defined order?
Batch
Continuous
Supervisory
DDC
DDC stands for__________
Direct digital control
direct documentry control
digital direct control
data documentry control
Which of the following process control has the capacity control multivariable processes with interaction between elements?
DDC
Batch
Supervisory
Feedforward
whole plant or more than one field devices through a master system can be controlled through _______ control
DDC
Batch
Continuous
Supervisory
