When can a piezometer be not used for pressure measurement in pipes.

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SSC JE ME Previous Paper 2 ( Held on: 22 Jan 2018 Evening)
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  1. The pressure difference is high
  2. The velocity is high
  3. The fluid in the pipe is a gas
  4. The fluid in the pipe is highly viscous.

Answer (Detailed Solution Below)

Option 3 : The fluid in the pipe is a gas
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Explanation:

F1 S.S Madhu 27.11.19 D 8

  • Piezometer is the simplest form of manometer used for measuring gauge pressure
  • One end of this manometer is connected to the point where the pressure is to be measured and the other end is open to the atmosphere
  • As one end is open to the atmosphere so it can’t be used for measuring the gas pressure
  • Gas pressure cannot be measured by means of piezometers because a gas forms no free atmosphere surface and it can’t be used when large pressures in the lighter liquid are to be measured
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