Pneumatic controls are most commonly used A) To move air ...

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Pneumatic controls are most commonly used
 
  A) To move air through the duct of forced air systems
  B) To operate systems with programmable logic control
  C) To control dampers and valves in large commercial systems
  D) To turn on and off small residential air conditioning systems

Question 2

Forging to join metals uses:
 
  A) Additional filler metals B) Electric resistance
  C) Heat and pressure D) All of the above

[akpaschal]

Answer to Question 1

C

Answer to Question 2

C

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