Electro Mechanical Control Technology winningAnswers

Exam: 286838RR – Pressure And Level Measurement

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Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. _______ occurs when you subject a mechanical sensor to pressure beyond its design limit. A. Corrosion
B. Overranging

C. Steam condensation D. Over calibrating

2. A _______ sensor is a level measuring sensor consisting of a radar generator that emits an intermittent pulse with a constant frequency that’s directed toward the surface of the material in a vessel.

A. tuning fork

B. pulsed radar level

C. frequency modulated continuous wave D. guided wave radar

3. A _______ pressure transducer is a diaphragm pressure sensor with an electrical element made of two parallel conductive plates separated by a dielectric.

A. capillary B. reluctance
C. capacitance D. piezoelectric

4. One way to determine the amount of material held in a tank that hangs from a beam is to install a _______ load cell.

A. hydraulic-type

B. compression-type electronic C. tension-type
D. shear-type

5. One type of pressure spring consists of a hollow tube formed into a A. hot junction.
B. spiral. C. node.
D. bimetallic strip.

6. A _______ is a liquid level measuring instrument consisting of a buoyant cylindrical object that’s heavier than the liquid in which it’s immersed.

A. displacer B. tape float C. float
D. cable and weight

7. A point level measuring system consists of a circuit that includes an electrode and the vessel wall. The material in the vessel rises to the point that the circuit is completed. This measuring system is known as a (n)

A. magnetostrictive probe. B. conductivity probe.
C. capacitance sensor. D. electrode sensor.

8. A _______ is a level measuring instrument incorporating a tube extending to the bottom of a vessel and a pressure-measuring device.

A. displacer B. bubbler C. float
D. cable and weight

9. Adding enough inlet tubing to allow the process fluid to cool before entering the sensor may _______ the useful temperature range of pressure sensors.

A. not effect B. increase C. decrease D. destroy

10. A pressure of 1 psi is equal to a hydrostatic head of _______ inches of water. A. 14.7
B. 23.5 C. 27.7 D. 30.2

11. A laser level instrument consists of all of the following except a A. vacuum.
B. detector.

C. laser beam generator. D. timer.

12. A _______ is a continuous level measuring instrument consisting of a floating object connected by a chain, rope, or wire to a counterweight, which serves as the level indicator.

A. tape float B. displacer C. d/p cell D. bubbler

13. A _______ is a device consisting of a liquid-filled tube used for measuring pressure. A. graduated cylinder
B. transducer C. diaphragm D. manometer

14. _______ pressure is measured with a perfect vacuum as the zero point of the scale. A. Differential
B. Gauge C. Absolute D. Vacuum

15. _______ are valves located on a water column that determine boiler water level if a gauge glass isn’t functional.

A. Gauge glasses B. Try cocks
C. Water columns D. Control valves

16. _______ is force divided by the area over which that force is applied. A. Pascal
B. Fluid

C. Pressure D. Gauge

17. When fully loaded, strain-gauge load cells compress approximately _______ inch(es). A. 0.500
B. 5

C. 0.005 D. 0.050

18. When measuring pressures of _______ psig or more, thermal expansion of a filling fluid caused by process temperature changes has minimal effects on accuracy.

A. 5 B. 15 C. 0 D. 10

19. Load cells are selected with a safety margin that’s _______% to _______% greater than the maximum load expected to be applied to each load cell.

A. 100; 200 B. 0; 50
C. 50; 100 D. 0; 100

20. _______ flow occurs when material empties out of the bottom of a silo and the main material flow is down the center of the silo, with stagnant areas at the sides and bottom of the silo.

A. Bridging B. Funnel C. Rathole D. Mass

End of exam

Exam: 286839RR – Flow And Position Measurement

When you have completed your exam and reviewed your answers, click Submit Exam. Answers will not be recorded until you hit Submit Exam. If you need to exit before completing the exam, click Cancel Exam.

Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. A(n) _______ fluid undergoes very little change in volume when subjected to a change in pressure. A. incompressible
B. laminar

C. compressible D. kinematic

2. Differential pressure connections are typically made with flange, vena contracta, and _______ taps. A. blocking
B. shaped C. manifold D. pipe

3. When gas flow is being measured, the measuring instrument must be mounted _______ the flow element.

A. next to

B. so the impulse lines pass below C. below
D. above

4. The _______ range of a proximity sensor is the range at which the target reliably actuates the sensor. A. nominal
B. effective C. working D. actual

5. A(n) _______ is a calculating device that determines the total the amount of flow during a specified time period.

A. differential pressure switch B. derivative
C. mass flowmeter D. integrator

6. A(n)_______ is the tubing or piping connection that joins flowmeter taps with a differential pressure instrument.

A. flange tap B. pipe tap
C. vena contracta tap D. impulse line

7. _______ is the difference in range between a proximity sensor’s actuation point and the release point. A. Frequency measurement
B. Nominal range C. Hysteresis
D. Web guiding

8. _______ measures the quantity of fluid passing a point at a particular moment. A. Total flow
B. Absolute viscosity C. Flow rate
D. Kinematic viscosity

9. A(n) _______ is a variable-area flowmeter consisting of a tapered tube and a float with a fixed diameter. A. pitot tube
B. orifice

C. rotameter

D. Bernoulli meter

10. A _______ flowmeter consists of a stainless steel tube lined with nonconductive material and incorporates two electrical coils mounted on the tube in a saddle-like pattern.

A. vortex shedding B. turbine
C. saddle D. magnetic

11. A(n) _______ proximity sensor consists of a sensor coil, an oscillator, a trigger circuit, and an output switching circuit.

A. photoelectric B. mechanical C. inductance D. infrared

12. A _______ flow switch consists of a thin, flexible piece of metal inserted into a pipeline. A. blade
B. differential pressure C. rotameter

D. thermal

13. _______ switches require physical contact with an object to actuate the switch mechanism. A. Photoelectric
B. Mechanical C. Capacitance D. Ultrasonic

14. A _______ ultrasonic meter is a meter consisting of two sets of transmitting and receiving crystals, one set aimed diagonally upstream and the other aimed diagonally downstream.

A. transit time B. diagonal C. Coriolis D. Bernoulli

15. A(n) _______ is a mechanical flowmeter consisting of blades mounted on a rotating wheel that measures the velocity of a liquid stream by counting the pulses produced by the blades as they pass an electromagnetic pickup.

A. orifice meter

B. rotating disk meter C. turbine meter
D. rotameter

16. A _______ valve is used at a differential pressure measuring instrument to provide a convenient location to isolate the instrument from the impulse, equalizing, or venting lines and to provide a way to equalize the high- and low-pressure sides of the differential pressure instrument.

A. blocking B. pipe
C. vapor D. steam

17. _______ is the ratio of maximum flow to minimum measurable flow at a desired measurement accuracy.

A. Rangeability B. Turndown C. Laminar flow
D. Differential pressure

18. Target objects spaced _______ each other may continuously activate a proximity sensor. A. intermittently from
B. at irregular intervals from C. too far apart from
D. too close to

19. A(n) _______ is the tube that connects a flowmeter tap to a differential pressure instrument. A. impulse line
B. orifice

C. flow nozzle D. venturi

20. A diffused-mode photoelectric sensor detects light A. with a separate receiver.
B. reflected from a reflector. C. reflected from the target. D. that becomes polarized.

End of exam

Exam: 286840RR – Automatic Controls System

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Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. _______ transfer is a controller function included so that there is no sudden change in output value when a controller is switched from automatic to manual mode or back again.

A. Bumpless B. Static
C. Automatic D. Output

2. A(n) _______ is a control system that provides feedback to a controller on the state of a process variable.

A. closed loop B. offset
C. setpoint

D. control loop

3. _______ control is a control strategy that only controls the inputs to a process without feedback from the output of the process.

A. Feedback B. ON/OFF C. Proportional
D. Feedforward

4. Setpoint tracking is the technique of storing the _______ in a setpoint memory module while the controller is in manual mode.

A. control variable B. process variable
C. manipulated variable D. setpoint

5. A(n) _______ is the range of values where a change in measurement value results in no change in controller output.

A. open loop B. deadband C. lag

D. proportional band

6. A process has a single time constant of 1.0 seconds. If an input to the process changes, how many seconds would you expect to pass before the process output adjusts 99% of the way to its new value?

A. .2 seconds B. 5 seconds C. 99 seconds D. 1 second

7. The _______ manual-tuning method involves making small changes in the setpoint and observing the responses.

A. self-tuning

B. Ziegler-Nichols open loop C. setpoint step change
D. Ziegler-Nichols closed loop

8. A _______ variable is an independent variable in a process control system that is used to adjust a dependent variable.

A. dynamic B. setpoint C. control D. controller

9. A primary element is the sensing device that detects the condition of a _______ variable. A. control
B. secondary C. setpoint D. process

10. A(n) _______ output has a continuous range of possible output values between minimum and maximum limits.

A. discrete B. digital C. binary D. analog

11. _______ occurs when the process variable exceeds the upper deadband value as the result of a system disturbance.

A. Tuning

B. Undershoot C. Overshoot D. Gain

12. Ziegler-Nichols _______ tuning is a method of tuning a controller by increasing the gain until the system cycles at the point of instability.

A. dynamic gain B. open loop C. static gain D. closed loop

13. _______ open loop tuning is a method of tuning a controller based on open loop response to a step input.

A. Rise time

B. Ziegler-Nichols C. Stand-alone
D. Dynamic response

14. _______is the factor by which the controller gain may be increased before instability occurs. A. Adaptive gain
B. Throttling range C. Open loop tuning D. Gain margin

15. An integral (I) control strategy changes the _______ of a controller by an amount proportional to the error and the duration of that error.

A. derivative gain B. output
C. proportional gain D. integral gain

16. Ziegler-Nichols tuning methods are intended to achieve a A. 10% dynamic response time.
B. 10% static response time. C. 10% rise time.
D. one-quarter decay ratio.

17. The _______ is a measure of how quickly the amount of overshoot decreases from one oscillation to the next as the controller brings the process to the setpoint.

A. undershoot

B. proportional band C. decay ratio
D. gain

18. Changes to the inputs to a process have consistently proportional change in its output. This is an example of

A. linear gain.

B. precision process control. C. non-linear gain.
D. an ideal closed loop process.

19. The _______ gain (Ku) is the proportional gain at the point of oscillation. A. minimum
B. ultimate

C. proportional D. integral

20. An open tank of distilled water is heated by excess heat exhausted by another portion of the process. Regardless of how much heat is applied to the open tank, the temperature of the boiling water remains constant. This is an example of a

A. closed loop.

B. physical impossibility. C. self-regulating process. D. chemical reaction.

End of exam

Exam: 286841RR – Valves And Other Control System Actuators

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Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1. _______ operation is a control configuration where a single control signal is directed to two or more control valves.

A. Dual-choice

B. Control-dividing C. Split range
D. Alternative valve

2. A _______ valve is a throttling type where the flow enters, makes a turn through the plug and seat, and then makes another turn to exit the valve.

A. seat

B. solenoid C. plug
D. globe

3. A three-way solenoid valve shuts off the air supply and _______ when the solenoid is de-energized. A. reverses the process fluid flow
B. vents air from the actuator C. activates an alarm
D. pressurizes gas in the actuator

4. The _______ pressure ratio is the ratio of a valve’s downstream pressure to the upstream pressure at the point where the gas moving out of the valve reaches a sonic velocity.

A. sonic

B. downstream C. critical
D. preferred

5. A damper’s position is most likely manipulated by the controller through a(n) A. actuator.
B. positioner.

C. ration regulator.

D. pilot-operated regulator.

6. A pressure regulator is an adjustable valve designed to automatically control the pressure A. at a control valve.
B. inside a pressure vessel. C. upstream of the regulator.
D. downstream of the regulator.

7. A _______ is a semiconductor switching device that uses a low-current DC input to switch an AC circuit.

A. solid-state relay B. break
C. direct controller D. mechanical switch

8. A _______ transducer is a device that converts an electronic controller output signal into a standard pneumatic output.

A. voltage-to-pneumatic (V/P) B. current-to-pneumatic (I/P) C. pneumatic-to-voltage (P/V) D. pneumatic-to-current (P/I)

9. A(n) _______ positively ensures the location of a valve stem. A. characteristic cam
B. positioner C. calibrator D. actuator

10. A _______ pump provides a constant flow rate at any discharge pressure for a given operating speed. A. dynamic-head
B. positive-displacement C. static-head
D. hydraulic-curve

11. For a pumping system, _______ is the pressure loss due to flow through the piping and varies with flow rate.

A. dynamic flow

B. Bernoulli exchange C. frictional head
D. flow pressure

12. A _______ regulator maintains the pressure upstream of the regulator to a set value. A. backpressure
B. differential pressure

C. pressure-relief

D. modulating

13. A _______ globe valve consists of two plugs and seat rings through which the fluid flows. A. single-port
B. double-dip C. dual-flow D. double-port

14. A _______-way solenoid valve is a single- or dual-coil solenoid that has an air supply, a vent, and two cylinder ports.

A. one B. two C. three D. four

15. A(n) _______ relay allows for proportional control and a ramp-up function of the load. A. single-pole
B. double-throw C. zero switching D. analog switching

16. An AC variable-speed drive alters rotational speed by changing the _______ of the voltage applied across the motor contacts.

A. power

B. resistance C. phase
D. frequency

17. The purpose of a pilot-operated pressure regulator is to provide more accurate pressure control by early eliminating

A. droop.

B. flow measurement errors. C. calibration errors.
D. temperature compensation.

18. Doubling the rotating speed of a fan results in a _______ of air flow through the fan. A. halving
B. doubling

C. quadrupling D. tripling

19. A valve _______ is a machined disc or shaped piece that regulates the flow by changing the size of the valve opening.

A. seat ring B. plug
C. globe D. stem

20. A pilot-operated pressure regulator uses the _______ as a pressure source to power the diaphragm of a larger valve.

A. upstream fluid pressure

B. controller air pressure signal C. pneumatic relay
D. downstream fluid pressure

End of exam

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