Discussion
Disadvantage of an electronic control system is :
Answer: C
The keyed disadvantage is that electronic control is susceptible to fire risk.
Compared with pneumatic control, which uses only compressed air and is intrinsically safe, electronic control systems carry electrical energy into the plant. In hazardous areas, such as refineries and chemical plants with flammable gases, a spark from electrical equipment can ignite the atmosphere, so electronic instruments need explosion-proof or intrinsically safe designs.
Electronic controllers draw very little current, are generally cheaper and more flexible than pneumatic ones, and are not inherently affected by the seasons, so the other options are not their characteristic disadvantage.
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