WorksheetsPDC
Total questions: 35
Worksheet time: 26mins
All these pictures are flow measuring device except:
Below are main pneumatic components except:
Compressor
Air Cylinder
Actuator
Tank
Name the missing part of the valve?
Actuator
Positioner
Gate Valve
Valve Body
What type of the valve actuator is shown?
Pneumatic Actuator
Hydraulic Actuator
Electric Actuator
Hot Air Actuator
Which one is the Ball Valve?
This types of pump is use dosage flow to control its flow. Normally it is use to regulate dosage of acid in tank
Diaphragm Pump
Peristaltic Pump
Centrifugal Pump
Solenoid Pump
Below a several guide to select the metering pumps except:
Required feed rate
Temperature of the fluid
Back pressure of the application
Particulate matter content in the fluid
Motor, pump and switches are being controlled and connected to this device. This device helps operator to monitor, control and it can store the controlled inputs and output of the machine and process. Normally this device is install near the equipment. What is the name of this system?
Human Media Interface
Programmable Logic Controller
Distributed Control System
Supervisory Control and Data Acquisition System
In a home water heater system, the thermometer is ______________.
controller
final control element
process
measuring element
What are the output for washing machine?
water level & water temperature
time & colour
water temperature & pressure
pressure & water level
Home water heater, the control system attempts to maintain the _____________ in the tank at desired value.
input
temperature
output
level
Two example of closed-loop control system are:
light switch & coffee maker
navigation system & car cooling system
bread toaster & hair dryer
air conditioning & bread toaster
The controller takes action by sending signal to _________.
Final control element (FCE)
sensor
computer
process
Choose the correct arrangement of block diagram.
FCE => process => controller => sensor
sensor => process => FCE => controller
process => FCE => sensor => controller
controller => FCE => process => sensor
A ____________ is made of two dissimilar metals and generates a small voltage when exposed to changing temperatures.
RTD
Thermocouple
thermistor
Thermowell
A temperature sensing device made of multiple thermocouples connected together in series is a _____________.
Thermowell
Thermopile
Thermocouple Pyrometer
Thermistor
A ___________ flow meter is a flow measuring device which uses a disc that wobbles at a consistent rate when exposed to fluid flow
Positive displacement
Turbine
Nutating disc
Coriolis effect
Systematic error or offset introduced into a measurement system is called _________
Drift
Dead zone
Precision
Bias
On a P & ID diagram a line with an occasional two dashes indicates a __________ line.
Pneumatic
Electric
Signal
Process
Following are about bourdon tube sensor, Except:
The displacement secondary device which placed at the end of the tube is use to generate the electrical signal.
The bourdon tube is use to measure pressure at local instrument.
The open end of the tube is attached to a header by which pressure can be introduced to the inside of the tube.
The reading from bourdon tube sensor is shown in control room.
It is used to convert the displacements generated to the electrical signal. The amount of imbalance bridge circuit is proportional to the applied pressure. Above are the explanation of?
Piezoelectric
Electromagnetic flowmeter
Strain gauge
Resistance gauge
Suggest an appropriate flow measurement to be installed in a liquid tank in order to measure a very corrosive liquid, such as ferric chloride, which used in wastewater treatment plant.
Bellows-type
Electromagnetic Flowmeter
Venturi differential pressure meter
Turbine flowmeter
Following are correct about vortex flowmeter, EXCEPT:
Low cost installation due to the not required impulse tubing, valve manifold and no moving parts.
Vortexes are suited to be used in viscous fluid at low flow rate
Vaporization of liquid may breakdown the vortex detector.
A device that counts the vortices passing per second.
Following are about this device, except:
Mainly used for demostration purpose.
Can be measure automatically.
Usually use for low pressure.
Easily damage.
Following are INCORRECT about the control valve, EXCEPT:
Control process conditions
Compare the "setpoint" value to a "process variable"
Adjust the flow rate of fluids in the pipeline
The valve is malfunction without an actuator
Following are range signals accepted for control valve, EXCEPT:
3-15 psi
4-20 psi
0.2-1.0 bar
4-20 mA
Following are the functions of the actuator, EXCEPT:
accepts a signal from the control system.
adjust the position of the valve body.
adjust the position of the valve stem.
moves the valve to a fully-open or fully-closed position.
Following are TRUE about butterfly valve, EXCEPT:
A linear motion valve
used for throttling and
on/off services.
used for corrosive liquids at low temperature
stem is used to connect the actuator with the disc valve
Following are TRUE about globe valve, EXCEPT:
Flow can be regulated by the percentage of the opening of the valve.
Good shutoff capability.
consist of a spherical ball located between two sealing rings
A linear motion valve
Following condition exists when the valve outlet pressure is less than the fluid vapor pressure. The fluid enters the valve as a liquid and exits as a vapor.
Cavitation
Nominal
Inherent
Flashing
Following flow characteristic commonly used for control application. The limitation of this characteristic is the flow does not shut off completely.
Equal percentage
Linear opening
Fast Opening
Quick Opening
Feedback control produce a very oscillatory responses and instability
true
false
A device that used to convert a sensing input into an electric or pneumatic signals that can be read by the controller
valve
Transmitter
controller
Sensor
A feedback control loop is applied on a liquid level in a boiler drum. Identify the CV and MV for the process.
CV: Temperature, MV: Liquid Level
CV: Level,
MV: Feedwater Flowrate
CV: Feedwater Flowrate,
MV: Liquid Level
CV: Level,
MV: Steam Flowrate
If the level of liquid in a tank is allowed to be maintained within 5 ft (+-) of 50 ft, what is the liquid’s level setpoint?
50
5
45
55
