ITMC Instrumentation & Measurement

Question 1

What is the primary function of a pressure transmitter in an industrial process?

Accepted Answer

To convert pressure readings into electrical signals for remote monitoring

Answer

To manually adjust pressure levels in a pipeline

Answer

To physically block excess pressure in a system

Answer

To measure temperature using pressure changes

Question 2

What does RTD stand for in temperature measurement instrumentation?

Accepted Answer

Resistance Temperature Detector

Answer

Rapid Thermal Display

Answer

Remote Temperature Device

Answer

Reactive Thermal Detector

Question 3

Why is the 4-20 mA signal standard preferred for transmitting process measurements over long cable runs?

Accepted Answer

Current signals are not affected by line resistance the way voltage signals are

Answer

It requires no power supply and works universally with all instruments

Answer

It allows bidirectional communication between field instruments

Answer

It operates at lower power than voltage-based signal systems

Question 4

What is the primary operating principle of a thermocouple?

Accepted Answer

Two dissimilar metals joined at a junction generate a voltage proportional to temperature

Answer

The resistance of a metal changes proportionally with temperature

Answer

A bimetallic strip deflects in proportion to temperature change

Answer

Infrared radiation emitted by an object is measured electronically

Question 5

Which type of sensor detects metallic objects without physical contact by generating an electromagnetic field?

Accepted Answer

Inductive proximity sensor

Answer

Limit switch

Answer

Photoelectric sensor

Answer

Piezoelectric sensor

Question 6

What is zero suppression in pressure instrumentation calibration?

Accepted Answer

Calibrating so that a pressure above zero corresponds to the instrument's minimum output

Answer

Setting the instrument output to zero when process pressure is exactly zero

Answer

Removing the effect of atmospheric pressure from all readings

Answer

Eliminating electrical noise from the low-end signal

Question 7

Which flow measurement device works by creating a restriction in the pipe and measuring the resulting differential pressure?

Accepted Answer

Orifice plate with differential pressure transmitter

Answer

Rotameter (variable area meter)

Answer

Ultrasonic flow meter

Answer

Magnetic flow meter