WorksheetsDCB5142_QUIZ 1_DPB4A
Total questions: 7
Worksheet time: 21mins
Define sensor…
An active device that produces an electrical signal which is a function of the change in the sensing element.
A device that produces an electrical signal that is standardized function of the change in the physical variable.
A component that undergoes a measurable change in response to a change in the variable to be measured
A component that measured the variable and the input to the control module.
Choose the correct statement that refers to Resistance Temperature Detectors (RTD)
Electrical transducers, converting temperature changes to voltage signals by measuring resistance changes
Increase of resistance with temperature is virtually linear and it has a relatively small span
Two dissimilar metals are joined at two points and heats is applied to one junction, an electric current will flow around the circuit
Produce a voltage corresponding to the temperature difference between the measuring junction and reference junction
The following instruments are velocity sensor used in building control system, EXCEPT…
Pitot tube
Strain gauge
Orifice plate
Hot wire anemometer
“Movement of the pressure sensing element operates a variable resistors” this statement refers to…
Inductive pressure
Strain gauge
Capacitive pressure
Potentiometer
Choose why humidity sensor is very important in building control system…
Measure heat to ensure that a process is either; staying within a certain range, providing safe use of that application, or meeting a mandatory condition when dealing with extreme heat, hazards, or inaccessible measuring points.
The amount of water vapor in air can affect human comfort as well as many manufacturing processes in industries.
Liquid-level monitoring systems require the use of sensors to measure the pressure, and thus the height, of the liquid
As touch-sensitive elevator buttons and lamps which dim or brighten by touching the base, besides innumerable applications of which most people are never aware.
Select THREE (3) advantages of thermistor
Less complex
Less expensive
React faster to temperature change
Do not have the high accuracy
Select TWO (2) main characteristics of thermocouple
Joint of two dissimilar metals
Commonly used device for measuring the mean and fluctuating velocities in fluid flows.
Cold junction as reference point
