Quiz 1/chap 6 text/Mod 1 Flashcards
What type of reaction do you suppose would be indicated by the following?
A) endothermic reaction
B) exothermic reaction
C) level control
D) pressure control
A) endothermic reaction
Refer to the previous question (reactor vessel). What device would produce a 20 bit asynchronous output word?
A) TY
B) TV
C) PT
D) TT
D) TT
Refer to the previous question (reactor vessel) once again. The manipulated variable is;
A) feed in
B) product out
C) condensate
D) flow rate of steam
D) flow rate of steam
Refer back to the previous question (reactor vessel). The manipulated variable is measured.
A) True
B) False
B) False
An example of primary sensing element is:
A) a signal conditioner
B) an I/P
C) a temperature element
D) a thermowell
C) a temperature element
What device compares two signals?
A) a final control element
B) a transmitter
C) a sensing element
D) a controller
D) a controller
The LRV and URV of a process that ranges from 300C to 500C, and represented by a standardized pneumatic transmitter would be:
A) 4mA = 300C 20mA = 500C
B) 4mA = 300C 20mA = 200C
C) 3 psi = 300C 15 psi = 500C
D) 0 psi = 300C 15 psi = 500C
C) 3 psi = 300C 15 psi = 500C
We have a 0-100 psi process signal; which is to be represented by a 4-20 mA standardized signal. Would we use a controller to perform this conversion?
A) True
B) False
B) False
The zero and span for a process that ranges from 300C to 500C would be:
A) zero = 4mA span = 20mA
B) zero = 300C span = 200C
C) zero = 300C span = 500C
D) zero = 3 psi span = 15 psi
B) zero = 300C span = 200C
If we bypass the controller in a control loop, we say the process is under:
A) automatic control
B) manual control
C) self regulating control
D) remote control
B) manual control
The manipulated variable in a home heating system would be:
A) the gas flow to the burner
B) the heat generated in the firebox
C) the ambient temperature in the house
D) the desired temperature set at the thermostat
A) the gas flow to the burner
According to ISA a process is defined as:
A) an operation which involves a change in energy, state or composition.
B) the control system that maintains a setpoint value.
C) a physical system that is ready to receive energy
D) a migration from one state to another.
A) an operation which involves a change in energy, state or composition.
The target value of the process is called:
A) the measurement variable
B) the controlled variable
C) the controller output
D) the setpoint
D) the setpoint
A device that converts 4-20 mA to 3-15 psi is called a:
A) sensing element
B) controller
C) final control element
D) converter
D) converter
The following indicates that:
A) the process is out of control
B) the process is properly controlled
C) a lot of noise in the process loop
D) the control valve is fixed at 50%
B) the process is properly controlled
What do you notice about the following?
A) the water level is too low to be sensed
B) the steam pressure too high
C) the LT is producing a 4-20 mA signal
D) the water level is too high
A) the water level is too low to be sensed
Refer back to the previous question again (steam drum). What type of standardized signal do you notice?
A) 4-20mA
B) 3-15 psi
C) wireless
D) digital
B) 3-15 psi
Refer to the previous question (steam drum) and refer only to what you see. What important control and measurement components are missing from the boiler system shown?
A) a controller
B) the steam drum
C) a level transmitter
D) make up water
A) a controller
