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MCQ on Building Controls I: An Introduction to Building Controls | Primo Engineering

The purpose of a building control system is to measure environmental data (E.g. temperature, humidity, pressure, or flow rate), compare that data against predetermined standards and initiate a change in order to change or maintain current environmental conditions.
  • False
  • True


A simple ______________ is defined as one input to a controller housing the control logic, which provides an output to one controlled device.
  • Control system
  • Control loop
  • Control function
  • Reset module


What provides data to the controller?
  • Input devices such as sensors or contact closures
  • Direct digital control
  • Closed loop
  • Controlled variable


Which control system component interprets the input according to its control logic?
  • Sensor
  • Controller
  • Output
  • Controlled device


Which control system component is activated in order to change or maintain environmental conditions?
  • Input
  • Sensors
  • Controlled device
  • None of the answer choices


Which control system component is activated in order to change or maintain environmental conditions?
  • Input
  • Sensors
  • Controlled device
  • None of the answer choices


This is the type of control loop where the output has no effect on the controlling variable.
  • Open
  • Closed
  • Cascading
  • Direct Digital


Another name for a cascade control loop is:
  • Analog control loop
  • Reset control loop
  • Manual control loop
  • None of the answer choices


This is the type of control loop where the controlling variable is affected by the actions of the controlled device upon the controlled variable.
  • Open
  • Closed
  • Cascading
  • Direct Digital


This is the type of control loop used to modify the performance of closed control loops when required.
  • Open
  • Closed
  • Cascading
  • Direct Digital

An Introduction to Building Controls

a. For an environmental control system to effectively manage the environment in a building, thereby increasing energy efficiency and occupant comfort, three things must take place:

MCQ on Building Controls I: An Introduction to Building Controls | Primo Engineering
what is control
  • i. Data must be measured and provided as input to the system
  • ii. Measured data then can be compared to a set of desired outcomes or instructions
  • iii. An output is produced based on the measured data to change or maintain the environment

b. A simple control loop is defined as one input to a controller housing the control logic, which provides an output to one controlled device

c. Inputs and outputs may be analog or digital

d. A controller may contain many control loops, and a control system may contain many controllers

e. There are three types of control loops
  • i. Open
  • ii. Closed
  • iii. Cascading

f. And there are three common control technologies
  • i. Pneumatic
  • ii. Electrical, and
  • iii. Electronic

g. Electronic controls may be
  • i. Direct Digital Control, called DDC, or
  • ii. Enable / Disable Control

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