What is the main signal for process instrumentation lines and control loop instruments?
A) Hydroelectric power
B) Electricity
C) Solar power
D) Pneumatic power
Answer: D
Explanation: A) Incorrect. Pneumatic power is the main signal for process instrumentation lines and control loop instruments.
B) Incorrect. Pneumatic power is the main signal for process instrumentation lines and control loop instruments.
C) Incorrect. Pneumatic power is the main signal for process instrumentation lines and control loop instruments.
D) Correct. Pneumatic power is the main signal for process instrumentation lines and control loop instruments.
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