Study the basic control loop multiple choice questions (MCQ) and test your technical knowledge on industrial instrumentation concepts.
Question 1
(A) signal converter, resistor, knob, and control valve
(B) transducer, valve packing, hex-head wrench, and tubing
(C) transmitter, controller, I/P transducer, and control valve
(D) resistor, capacitor, terminal block, and battery
(E) control valve, microprocessor, terminal block, and cables
Answer : C
Question 2
(A) Calibration drift
(B) Hysteresis
(C) A very expensive transmitter
(D) Proper documentation
(E) Negative feedback
Answer : E
Question 3
(A) A pressure transmitter
(B) An electric motor
(C) A heating element
(D) A control valve
(E) A servo
Answer : A
Question 4
(A) Hold a steadier setpoint value
(B) Ensure technician safety
(C) Minimize the possibility of sparking
(D) Protect the cable from corrosion
(E) Minimize electrical noise
Answer : E
Question 5
(A) 10 to 50 milliamps DC
(B) 0 to 5 amps AC
(C) 0 to 10 volts
(D) 0 to 20 milliamps
(E) 4 to 20 milliamps DC
Answer : E
Question 6
(A) The target value for the measured variable
(B) The DC supply power to the transmitter
(C) The maximum value for the low-alarm point
(D) The command signal to the control valve
(E) The production quota for each work day
Answer : D
Question 7
(A) I/P transducer
(B) Instrument signal cable
(C) Control valve
(D) Diaphragm
(E) Digital controller
Answer : D
Question 8
(A) Re-calibrate the temperature transmitter
(B) Move the control valve further open
(C) Completely open the control valve
(D) Move the control valve further closed
(E) Hold the control valve’s position steady
Answer : D
Question 9
(A) Process variable
(B) Setpoint
(C) Inferred variable
(D) Manipulated variable
(E) Error variable
Answer : A
Question 10
(A) The output responds to changes in the process variable
(B) The control valve will fail closed
(C) The process variable cannot deviate from setpoint
(D) The controller will automatically generate alarms
(E) The control valve will fail open
Answer : A
Credits : by Tony R. Kuphaldt
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