QUESTIONS AND ANSWERS INSTRUMENTATION_ENGINEERING

QUESTIONS & ANSWERS INSTRUMENTATION_ENGINEERING

Which of the following is one of the three steps that occur in the control of industrial processes?

  1. Make a decision
  2. Identify process variable
  3. Minimize risks
  4. Ensure quality

A key component in most feedback control loops is a:

  1. Thermostat
  2. Transmitter
  3. Pressure gage
  4. Fuel valve

Which of the following are the four most common process variables?

  1. Temperature, pressure, level, and flow
  2. Temperature, density, flow, and precision
  3. Level, precision, pressure, and flow
  4. Density, pressure, level, and flow

What is the correct order of steps that occur in any controlled process?

  1. Measure variables, make a decision, and take action
  2. Collect data, measure variables, and take action
  3. Measure variables, take action, and provide feedback
  4. Collect data, make a decision, and provide feedback

What type of variable is measured and compared to the desired value?

  1. Controlled
  2. Set
  3. Manipulated
  4. Adjusted

What type of variable is measured and compared to the desired value?

  1. Adjusted
  2. Controlled
  3. Set
  4. Manipulated

In process control, the action taken to eliminate any deviation is the adjustment of the:

  1. Controlled variable
  2. Set variable
  3. Manipulated variable
  4. Adjusted variable

To eliminate deviation in process control you can alter the:

  1. Controlled variable
  2. Set variable
  3. Adjusted variable
  4. Manipulated variable

A change in the demand on a system is referred to as:

  1. Upset
  2. Adjustment
  3. Manipulation
  4. Deviation

The constant measurement and response to information is called:

  1. Disturbance monitoring
  2. Feedback
  3. Feedback control loop
  4. Upset

The instruments that gather information, make decisions, and take action are each part of the:

  1. Feedback group
  2. Set point
  3. Feedback control loop
  4. Process group

A factor outside the loop that affects the controlled variable is referred to as: >

  1. Shift
  2. Adjustment
  3. Gage
  4. Upset

What are the four key components used in most feedback control loops?

  1. Sensor, transmitter, controller, and final control element
  2. Sensor, processor, transducer, and controller
  3. Processor, transmitter, receiver, and final control element
  4. Signal, transducer, controller, and processor

Which of the following is the first event in a typical feedback control loop sequence?

  1. The sensor, or transmitter, signals a controller of a change in a measured variable
  2. The controller sends a signal to the final control element
  3. A transmitter sends a signal to a control valve
  4. The final control element adjusts the system

What is the final event in a typical feedback control loop sequence?

  1. A transmitter sends a signal to a control valve
  2. The final control element adjusts the system
  3. The controller sends a signal to the final control element
  4. The final control element receives a signal from the controller

In a typical feedback control loop sequence, the field transmitter sends a signal to the:

  1. Final control element
  2. Sensor
  3. Controller
  4. Pressure gage

 

 

In a typical feedback control loop sequence, the controller sends a signal to the:

  1. Pressure gage
  2. Sensor
  3. Transmitter
  4. Final control element

The term that describes how consistently a sensor indicates the same input value at different times is:

  1. Validity
  2. Accuracy
  3. Precision
  4. Reliability

A common method of transmitting standard instrument signals is:

  1. Electrically
  2. Optically
  3. Mechanically
  4. Electronically

The time it takes to respond to a change in a controlled variable is called:

  1. Response time
  2. Controller delay
  3. Action sequence
  4. Reaction time

The time it takes for the indicated temperature to respond and accurately reflect the actual temperature is called:

  1. Sensor response time
  2. System response time
  3. Reaction time
  4. Controller delay

The change cycle is initiated by:

  1. System response
  2. Controller response
  3. Sensor response
  4. Transmitter response

Controller response affects:

  1. Transmitter response
  2. Sensor response
  3. Reaction time
  4. System response

What type of measurement closely indicates the actual value of the controlled variable?

  1. Accurate
  2. Valid
  3. Precise
  4. Reliable

What type of measurement consistently indicates the same input value at different times?

  1. Valid
  2. Precise
  3. Accurate
  4. Reliable

The term that describes how closely a sensor reflects a controlled variable is:

  1. Precision
  2. Validity
  3. Accuracy
  4. Reliability


The term that describes how consistently a sensor indicates the same input value at different times is:

  1. Validity
  2. Reliability
  3. Accuracy
  4. Precision

Which of the following are the most common ways of transmitting instrument signals?

  1. Digitally, pneumatically, and electronically
  2. Magnetically and hydraulically
  3. Hydraulically and mechanically
  4. Through mechanical movement or varying resistance

Two common types of final control elements used in process industries are:

  1. Electrical and pneumatic
  2. Optical and electrical
  3. Optical and mechanical
  4. Pneumatic and mechanical

Most final valve control elements are operated by:

  1. Optic or magnetic actuators
  2. Pneumatic or electrical actuators
  3. Magnetic control valves
  4. Motor driven gears

What are the two most common methods of final control in process industries?

  1. Optical and electrical
  2. Optical and magnetic
  3. Electrical and pneumatic
  4. Magnetic and mechanical

Two common types of final control elements used in process industries are:

  1. Electrical and magnetic
  2. Pneumatic and optical
  3. Optical and magnetic
  4. Electrical and pneumatic

The advanced control process that monitors a second variable in addition to the primary controlled variable is known as:

  1. Cascade control
  2. Ratio control
  3. Feedback loop control
  4. Feed forward control

Which type of control monitors a second variable at a different point in the process to help the system react to upsets more quickly?

  1. Cascade
  2. Ratio
  3. Feed forward
  4. Single-loop

 

What type of control measures a variable before it affects a set point?

  1. Ratio
  2. Feed forward
  3. Feedback
  4. Cascade

Which type of control monitors two different types of materials being combined and ensures that the right proportions are maintained?

  1. Feed forward
  2. Single-loop
  3. Ratio
  4. Cascade

What type of control is often used in combination with feedback control to reduce variations from set point?

  1. Single-loop
  2. Ratio
  3. Cascade
  4. Feed forward

Under what condition is a Wheatstone Bridge balanced?

  1. When resistors indicate pressure changes
  2. When there is process pressure
  3. When all legs are in parallel
  4. When current flow through each leg is equal

A linear variable capacitor indicates change in process pressure by:

  1. Altering resistance in resistors
  2. Changing the voltage to the transformer
  3. Moving the slide on the potentiometer
  4. Changing the distance between the plates

Which of the following best describes the use of electrical circuits in electrical pressure transducers?

  1. To convert mechanical motion into electrical values
  2. To modify electrical values into a measure of mechanical motion
  3. To determine applied pressure values
  4. To measure current output against a measured electrical value

On an electrical pressure transducer, what is measured to determine pressure?

  1. Voltage
  2. Changes in current flow
  3. Input pressure
  4. Output pressure

What is indicated by measured changes in current flow?

  1. Mechanical value
  2. Voltage
  3. Pressure
  4. Electrical motion

Moving the slide on a potentiometer will result in which of the following?

  1. Decrease in pressure
  2. Static voltage
  3. Increase in value
  4. Change in resistance

For accurate measurements, which type of circuit is most often used?

  1. Wheatstone bridge
  2. Potentiometric transducer
  3. Resistance indicator unit
  4. Series circuit

Which term describes a bridge where the resistance of all four resistors is equal?

  1. Equal resistance
  2. Balanced bridge
  3. Quad equilibrium
  4. Parallel equation

A typical bridge circuit has how many parallel legs?

  1. Four
  2. None
  3. Two
  4. Six

An absence of process pressure will result in which of the following?

  1. Parallel equation
  2. Equal resistance
  3. Process abstinence
  4. Balanced bridge

What causes the slide on a potentiometer to move?

  1. Change in pressure
  2. Gravitational pull
  3. Increase in voltage
  4. Equal resistance

Which of the following will cause an increase in current flow through a circuit?

  1. Balanced resistance
  2. Lower resistance
  3. Equal resistance
  4. Greater resistance

Which of the following is NOT a type of electrical pressure element?

  1. Linear Variable Differential Transformer
  2. Potentiometer
  3. Nanometer
  4. Linear Variable Capacitor

A decrease in a potentiometer’s resistance will result in which of the following?

  1. Decrease in current flow
  2. No change in current flow
  3. Reverse-direction of current flow
  4. Increase in current flow

What separates the two metal plates in a capacitor?

  1. Dielectric
  2. Spacer
  3. Circuit
  4. Wire

Which of the following is NOT a factor in determining a capacitors amount of opposition to current flow?

  1. Distance between plates
  2. Use of circuit
  3. Type of dielectric
  4. Size of metal plates

In addition to storing an electrical charge, which of the following opposes or offers resistance to changes in current flow?

  1. Transducer
  2. Potentiometer
  3. Capacitor
  4. Transformer

The dielectric is composed of which of the following types of material?

  1. Resistive
  2. Corrosive
  3. Conducting
  4. Insulating

Which device detects pressure by means of a wire that tensions or relaxes?

  1. Potentiometer
  2. LVDT
  3. Bonded Strain Gage
  4. Unbonded Strain Gage

Which type of pressure-sensing device is well suited for miniaturized electronic circuits?

  1. Linear variable capacitor
  2. Potentiometer
  3. Bonded strain gage
  4. Wheatstone bridge

What happens when the armature on an unbonded strain gage moves?

  1. The tensioned, resistance increases; when relaxed, resistance decreases
  2. The level of current remains constant when the armature moves
  3. When the armature moves, tension reduces resistance
  4. The level of pressure is reduced when the wire is tensioned

In a bonded strain gage, what is mounted to that part of the pressure element that does not move?

  1. The transducer
  2. The slip
  3. The tensioner
  4. The pinion

What is the basic operating principle of a strain gage?

  1. Resistance will decrease under tension and increase when relaxed
  2. Resistance will decrease and increase when tensioned
  3. Resistance will increase under tension and decrease when relaxed
  4. Resistance will stay the same until the armature no longer moves

An increase or decrease of tension in a strain gage is caused by which of the following?

  1. Movement of the slip
  2. Zero pressure
  3. Increase in current
  4. Movement of the armature

Which of the following is NOT a commonly used crystal in pressure measuring devices?

  1. Bromide quartzite
  2. Rochelle salt
  3. Barium titanate
  4. Quartz

What action causes a crystal to produce a measurable voltage?

  1. An increase in applied current
  2. Being subject to strain
  3. Exposure to kinetic energy
  4. A decrease of pressure

Which factor determines the amount of voltage a crystal will produce?

  1. The volume of available kinetic energy
  2. The size and color of the crystal
  3. The amount of pressure applied
  4. The ambient temperature of the crystal

Which of the following is a characteristic of crystals that produce a voltage when subjected to pressure?

  1. They can produce a variety of voltages from a specific pressure
  2. They never produce the same voltage twice when subjected to a specific pressure
  3. They can usually produce the same voltage when subjected to a specific pressure
  4. They always produce a specific voltage when subjected to a specific pressure

What type of device is used to protect process-measuring instruments from vapor condensate?

  1. Seal Pot
  2. Snubber
  3. Pigtail
  4. Vacuum tube

 

INSTRUMENTATION AND CONTROL ENGINEERS QUESTIONS AND ANSWERS

 

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