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Author Question: Direct digital controls (DDC) operate by A) turning relay coils on or off to complete circuits ... (Read 31 times)

Kthamas

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on: Jul 26, 2018
Direct digital controls (DDC) operate by
 
  A) turning relay coils on or off to complete circuits
  B) processing electronic signals with a microprocessor
  C) providing a varying DC voltage in response to monitored conditions
  D) providing a modulating air pressure in response to monitored conditions

Question 2

Types of control systems include
 
  A) pneumatic, electromechanical, electronic, and DDC
  B) pneumatic, hydraulic, and electro-mechanical
  C) line voltage, low voltage, and communicating
  D) voltage, current, and milliamp


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Jossy

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Reply #1 on: Jul 26, 2018
Answer to Question 1

B

Answer to Question 2

A


Kthamas

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Reply 2 on: Jul 26, 2018
Excellent

yeungji

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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