Discussion
Assertion (A): A machmeter requires no temperature input.
Reason (R): The temperature and density terms cancel when total and static pressures are combined.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. Mach number can be expressed purely as a function of the ratio of total to static pressure, and in forming that ratio the density and temperature terms cancel out. The machmeter therefore works from the two pressures already present in the pitot-static system, which is why it can be a purely mechanical instrument.
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