Power Engineering - 4th and 3rd Class Instrumentation
Practice Questions 2 (4A9 All chapters 3A2 chapters 11-13)
With Complete Solutions
_____ control operates to prevent errors from occurring in the
first place.
A. Feedback
B. Feed-forward
C. Proportional
D. Proportional plus reset
E. Proportional plus reset plus derivative Correct Answers B.
Feed-forward
"Digital" computer systems use a binary number system of:
A. Zeros and tens.
B. Ones and zeros.
C. Tens and one hundreds.
D. Ones and one hundreds.
E. zero and 100 percentages Correct Answers B. Ones and
zeros.
"Fail safe" means that the end devices will be _______ once
their source of power has been removed.
A. Fully open
B. Fully closed
C. Manually locked
D. Held in current position
,E. Either fully open or fully closed Correct Answers E. Either
fully open or fully closed
(4-084-1.1) Some of the components of an automatic control
loop are a sensing element, a transmitter, a _____ and a control
valve.
a. Controller
b. Transformer
c. Transducer
d. Converter Correct Answers a. Controller
(4-084-1.10) A controller is a device that primarily:
a. Sends or transmits a positive rather than negative signal
b. Tries to maintain a set point
c. Records a system's performance
d. Is a logic device capable of making decisions Correct
Answers b. Tries to maintain a set point
(4-084-1.11) A variable which is adjusted in order to maintain or
achieve some desired value of another variable is termed the:
a. Process variable
b. Final variable
c. Manipulated variable
d. Controlled variable Correct Answers c. Manipulated variable
(4-084-1.12) A control loop controller:
a. Sends a signal to a primary element
,b. Measures the manipulated variable value, eliminating the
need of a primary element
c. Eliminates all setpoint deviation
d. Constantly compares a process variable to the set point
Correct Answers d. Constantly compares a process variable to
the set point
(4-084-1.13) When a process variable has no method of sending
information to the final control element (a valve for example)
the system is known as:
a. An open loop system
b. A cascade system
c. A feedback system
d. A feedforward system Correct Answers a. An open loop
system
(4-084-1.3) In a "closed loop" system of control, the control
behaviour is
a. Automatic
b. Both automatic and manual
c. Manual only
d. Intermittent Correct Answers a. Automatic
(4-084-1.4) Level, pressure, flow, and temperature are examples
of:
a. Transmitters
b. Measured variables
c. Sensing elements
, d. Manipulated variables Correct Answers b. Measured
variables
(4-084-1.5) In an automatic control system, the controller output
signal changes the position of the:
a. Recorder
b. Transmitter
c. Sensing element
d. Final control element Correct Answers d. Final control
element
(4-084-1.6) When a process controller is located a distance from
the sensing element, the sensing element sends its signal to a:
a. Transmitter
b. Controller
c. Control valve
d. Recorder Correct Answers a. Transmitter
(4-084-1.7) An open loop control system requires:
a. A transducer and a recorder
b. More accurate sensing devices
c. A very small amount of dead time or lag
d. Constant operator attention Correct Answers d. Constant
operator attention
(4-084-1.8) An unpredicted change in a plant process is called
a/an:
Practice Questions 2 (4A9 All chapters 3A2 chapters 11-13)
With Complete Solutions
_____ control operates to prevent errors from occurring in the
first place.
A. Feedback
B. Feed-forward
C. Proportional
D. Proportional plus reset
E. Proportional plus reset plus derivative Correct Answers B.
Feed-forward
"Digital" computer systems use a binary number system of:
A. Zeros and tens.
B. Ones and zeros.
C. Tens and one hundreds.
D. Ones and one hundreds.
E. zero and 100 percentages Correct Answers B. Ones and
zeros.
"Fail safe" means that the end devices will be _______ once
their source of power has been removed.
A. Fully open
B. Fully closed
C. Manually locked
D. Held in current position
,E. Either fully open or fully closed Correct Answers E. Either
fully open or fully closed
(4-084-1.1) Some of the components of an automatic control
loop are a sensing element, a transmitter, a _____ and a control
valve.
a. Controller
b. Transformer
c. Transducer
d. Converter Correct Answers a. Controller
(4-084-1.10) A controller is a device that primarily:
a. Sends or transmits a positive rather than negative signal
b. Tries to maintain a set point
c. Records a system's performance
d. Is a logic device capable of making decisions Correct
Answers b. Tries to maintain a set point
(4-084-1.11) A variable which is adjusted in order to maintain or
achieve some desired value of another variable is termed the:
a. Process variable
b. Final variable
c. Manipulated variable
d. Controlled variable Correct Answers c. Manipulated variable
(4-084-1.12) A control loop controller:
a. Sends a signal to a primary element
,b. Measures the manipulated variable value, eliminating the
need of a primary element
c. Eliminates all setpoint deviation
d. Constantly compares a process variable to the set point
Correct Answers d. Constantly compares a process variable to
the set point
(4-084-1.13) When a process variable has no method of sending
information to the final control element (a valve for example)
the system is known as:
a. An open loop system
b. A cascade system
c. A feedback system
d. A feedforward system Correct Answers a. An open loop
system
(4-084-1.3) In a "closed loop" system of control, the control
behaviour is
a. Automatic
b. Both automatic and manual
c. Manual only
d. Intermittent Correct Answers a. Automatic
(4-084-1.4) Level, pressure, flow, and temperature are examples
of:
a. Transmitters
b. Measured variables
c. Sensing elements
, d. Manipulated variables Correct Answers b. Measured
variables
(4-084-1.5) In an automatic control system, the controller output
signal changes the position of the:
a. Recorder
b. Transmitter
c. Sensing element
d. Final control element Correct Answers d. Final control
element
(4-084-1.6) When a process controller is located a distance from
the sensing element, the sensing element sends its signal to a:
a. Transmitter
b. Controller
c. Control valve
d. Recorder Correct Answers a. Transmitter
(4-084-1.7) An open loop control system requires:
a. A transducer and a recorder
b. More accurate sensing devices
c. A very small amount of dead time or lag
d. Constant operator attention Correct Answers d. Constant
operator attention
(4-084-1.8) An unpredicted change in a plant process is called
a/an:
