What instrument is used for visually indicating the pressure level? 

This question was previously asked in
RRB ALP Instrument Mechanic 23 Jan 2019 Official Paper (Shift 1)
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  1. Manometer
  2. Diaphragm sensor
  3. Bourdon tube
  4. Resonant wire device

Answer (Detailed Solution Below)

Option 1 : Manometer
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The correct option is 1

Explanation:

Manometers:

  • Manometers are devices in which columns of a suitable liquid are used to measure the difference in pressure between two points or between a certain point and the atmosphere.
  • A manometer is needed for measuring large gauge pressures. It is the modified form of the piezometric tube.

 

A common type of manometer is like a transparent "U-tube" as shown in Figure:

SSC JE MEchanical 2 17

These are of two types:

  1. Simple manometers
  2. Differential manometers

A simple manometer consists of a glass tube having one of its ends connected to a point where pressure is to be measured and another end remains open to the atmosphere.

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