Q1. Explain the working principle of differential pressure transmitter with the help of diagram and explain the following parts with their usages. (16)
A. Zero and span calibration
B. Negative feedback bellow
C. Pilot amplifier functions
D. Zero elevation concept.
Q6. a) Sketch and describe a valve suitable for reducing air pressure maintaining the reduced pressure within close limits. (8)
b) Describe the processes through which air from the starting air receivers should be treated before it is used in a pneumatic control system. (8)
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