ITMC Instrumentation & Measurement 2

Question 1

What is the purpose of instrument calibration?

Accepted Answer

To verify and adjust an instrument's output to match a known traceable standard

Answer

To clean and lubricate the sensing element of a field instrument

Answer

To replace worn sensing components with factory-new parts

Answer

To document an instrument's historical failure modes

Question 2

Which device converts a non-electrical physical quantity such as pressure or temperature into a standardized electrical signal?

Accepted Answer

Transducer

Answer

Actuator

Answer

Relay

Answer

Controller

Question 3

What physical principle does an orifice plate use to infer fluid flow rate?

Accepted Answer

Bernoulli's principle relating velocity to differential pressure

Answer

Doppler frequency shift of ultrasonic waves

Answer

Coriolis effect on a vibrating flow tube

Answer

Electromagnetic induction in a conductive fluid

Question 4

What type of thermometer measures temperature by detecting the infrared energy emitted by an object?

Accepted Answer

Infrared pyrometer thermometer

Answer

Bimetallic thermometer

Answer

RTD probe thermometer

Answer

Filled-system thermometer

Question 5

In process instrumentation, what does the term 'span' refer to?

Accepted Answer

The arithmetic difference between the upper and lower range limits of the instrument

Answer

The time required for an instrument to respond to a step change in input

Answer

The accuracy of the instrument at the midpoint of its range

Answer

The maximum cable length allowed between sensor and transmitter

Question 6

What is the function of a control valve as the final control element in a process loop?

Accepted Answer

To manipulate fluid flow in response to the controller's output signal

Answer

To measure and transmit the process variable to the controller

Answer

To supply electrical power to the sensing instruments in the field

Answer

To display the current process variable value to the operator

Question 7

What is the standard pneumatic signal range used in industrial process instrumentation?

Accepted Answer

3–15 PSI

Answer

0–10 PSI

Answer

0–20 PSI

Answer

5–25 PSI