What type of control element can only be on or off?
A) Discrete
B) Modulated
C) Valve control
D) Continuous
Answer: A
Explanation: A) Correct. A discrete or two-position control can only be on or off.
B) Incorrect. A modulated or continuous control is variable.
C) Incorrect. A discrete or two-position control can only be on or off.
D) Incorrect. A modulated or continuous control is variable.
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