FREE INSTRUMENTATION & CONTROL TECH QUIZ

Page 1 of 14

1. If a force of 4800 pounds is applied to a circular piston 4 inches in diameter, calculate the fluid pressure working against the piston.

A. 403.5 PSI

B. 862.6 PSI

C. 795.4 PSI

D. 763.9 PSI

2. Hydraulic systems use ________ to transfer force from one point to another.

A. Air

B. Gas

C. Liquid

D. Solid

3. The "Quarter-wave damping" is a condition of ?

A. Good control where process variable approaches setpoint without overshoot

B. Poor control where oscillations continue at constant amplitude

C. Excellent control where there are no oscillations

D. Good control where oscillations quickly subside

Page 2 of 14

4. When configuring a flame detection system for a plant and evaluating the various flame detection technology alternatives available today, it is useful to consider which of the following flame detectors performance criteria:

A. False alarm immunity, absorption capacity, detection range, accuracy

B. False alarm immunity, optical methods, response time, calibration settings

C. False alarm immunity, detection range, target gas, relative energy, accuracy

D. False alarm immunity, detection range, response time, field of view, self diagnostics

5. Which of the following flow-measuring elements is inherently linear?

A. Target

B. Turbine

C. Orifice plate

D. Pitot tube

6. All industrial hydraulic systems consist of the following basic components:

A. Power input device, control device, liquid, conductors, power output device

B. Power input device, control device, liquid, power output device

C. Power input device, control device, liquid, conductors, power output device

D. Power input device, control device, power output device

Page 3 of 14

7. Self-regulating processes always require some degree of which of the following control actions to achieve the setpoint?

A. Derivative action

B. Feed forward action

C. Proportional action

D. Integral action

8. What type of smoke detector senses sudden scattering of light when smoke enters the detector chamber, triggering the alarm?

A. Ultraviolet smoke detector

B. Infrared smoke detector

C. Photoelectric smoke detector

D. Ionisation smoke detector

9. The P&ID below shows which of the following control strategies?

A. Cascade

B. Ratio

C. Model predictive

D. Feed forward

Page 4 of 14

10. The sensor that uses the self-heating phenomenon to measure the flow in a pipe is called:

A. Encapsulated flow sensor

B. High power flow sensor

C. Thermistor

D. Resistive temperature detector

11. Which of the following features is not provided by a Fieldbus?

A. Bi-directional digital communication

B. Multivariable access

C. Remote configuration

D. Increase in wiring

12. Select the option that doesn’t belong to a characteristic of a double-block-and-bleed system

A. Its functions are: isolation and intervention

B. It’s made-up of three valves

C. Valves are parallel connected

D. Operate on the principle that isolation can be achieved from both the upstream and downstream process flow or pressures

Page 5 of 14

13. Which of the following applications is not recommended for gate valves?

A. Those that require regulation and throttling of flow

B. Those that can’t have resistance to flow when the valve is open

C. Those that require the use of flanged connections

D. Those that require good sealing with no leakage

14. According to this diagram, what type of controller is this and where is it located?

A. Hydraulic, it’s located in the process area

B. Digital, it’s located in the field

C. Pneumatic, it’s located in the control room

D. Electronic, it’s located on the front of the main control panel

15. Why are lock-out procedures important?

A. They improve employees performance

B. They isolate harmful energy sources to prevent injury to workers

C. They select isolation points

D. They store safety equipment

Page 6 of 14

16. Globe valves, butterfly valves and plug valves are types of:

A. Flow control valves

B. Directional control valves

C. Pressure control valves

D. None of the above

17. According to the symbols shown below, from left to right, what are the types of valves?

A. Ball, butterfly and gate

B. Globe, pinch and check

C. Ball, needle and butterfly

D. Globe, gate and pinch

18. In the P&ID shown below, which of the following is measuring the process variable?

A. Level tx

B. Flow tube

C. Pressure tx

D. Temperature indicator

Page 7 of 14

19. What are the elements of a basic control loop?

A. Indicator, controller and signal converter

B. Transducer, valve packing, power supply, and tubing

C. Transmitter, controller, transducer, and control valve

D. Indicator, controller, signal converter and control valve

20. If the pressure applied to the “low” side of a differential pressure transmitter increases while the pressure applied to the “high” side remains steady, the transmitter output should:

A. Decrease

B. Fail low

C. Increase

D. Remain the same

21. This is one of two protocols that let a network administrator supervise and distribute IP addresses from a central point. It automatically sends a new IP address when a new device is connected to the network.

A. DHCP

B. UDP

C. UTP

D. TCP

Page 8 of 14

22. How much differential pressure does the manometer below indicate?

A. 4 ”W.C.

B. 0.25 ”W.C.

C. 2 ”W.C.

D. 0.5 ”W.C.

23.

What is the name of this process diagram below?

A. Electrical drawing

B. Elevation drawing

C. Process and instrument drawing

D. Foundation drawing

24. When the reference junction is the same temperature as the measurement junction in a thermocouple circuit, the output voltage (measured by the sensing instrument) is:

A. Zero

B. Negative

C. The double of its true value

D. Unreliable

Page 9 of 14

25. Which type of sensor is used for door installations?

A. Passive Infrared Sensor (PIR)

B. Contact sensor

C. Active

D. Magnetic switch

26. Which of the following parameters should be adjusted first when calibrating an instrument?

A. Linearity

B. Span

C. Hysteresis

D. Zero

27. Which type of motion is transmitted by hydraulic actuators?

A. Linear motion

B. Rotary motion

C. Both A and B

D. None of the above

Page 10 of 14

28. A measurement of the difference between the largest and the smallest signals of the DAC is referred as:

A. Stable range

B. Static range

C. Determinant range

D. Dynamic range

29. What should you use to transport a bottle of compressed gas?

A. Hand truck

B. Cylinder cart

C. Wheelbarrow

D. Tunnel buggy

30. In pneumatic systems, which element removes most or all of the water in compressed air before it reaches critical components or processes?

A. Safety valves

B. Air dryers

C. Solenoids

D. Pneumatic relays

Page 11 of 14

31. From the following below, what should be done first when attempting to lift any material?

A. Look for any protruding nails, wires, or sharp edges

B. Use safety harnesses

C. Ask the supervisor for assistance

D. Make sure the staking ratio is no more than 3 to 1

32. The purpose of a pilot in a pneumatic controller is to:

A. Decrease the flow of air

B. Increase the flow of air

C. Give direct motion on final control element

D. None of the above

33. An unscheduled maintenance which involves fixing any sort of failures is considered a/an:

A. Corrective maintenance

B. Preventive maintenance

C. Reliability centered maintenance

D. Inspection

Page 12 of 14

34. Which of the following PLC outputs is considered as digital outputs because of its ON or OFF operation?

A. TRIAC outputs

B. Transistor outputs

C. Relay outputs

D. All of them are

35. What is the largest integer number a PLC counter function can reach using a 16-bit register?

A. 65,535

B. 32,767

C. 65,536

D. 32,768

36. You have been asked to run Ethernet cabling in a factory that uses a lot of electrical equipment. Which type of Ethernet cabling is the best choice?

A. UTP

B. STP

C. MMF

D. Plenum-rated cable

Page 13 of 14

37. All positioners require two things for proper operation, which are they?

A. Input and feedback

B. Supply and balance

C. Flapper and nozzle

D. Valve and actuator

38. What would be the speed (in rpm) of a 4-pole motor running at 40 Hz?

A. 1000 rpm

B. 1200 rpm

C. 1600 rpm

D. 1800 rpm

39.

What is the type of action of the controller shown below?

A.Direct

B.Reverse

C.Integral

D. functional reset demand

Page 14 of 14

40.

What does the following diagram represent?

A.An analog signal line

B.An instrument that requires calibration

C.Piping and wiring

D.A copper wire for signal lines

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