Instrumentation Interview Question : Pressure measurement


#1

Q)What is pressure ? or Define pressure ?

A)Pressure is the amount of force applied over a defined area.

Q)The factors that will influence hydro static pressure ?

A)Level of the liquid
Density of the liquid
Pressure on the surface of the liquid (vapor space)

Q) Density of liquid

A)Density is the mass of a particular substance per unit of
volume

Q) Definition of Specific Gravity

A)Specific gravity is the ratio of the density of a particular liquid
to the density of water at a reference temperature.

Q)Reason for measuring pressure ?

A)Safety
Process efficiency
Cost savings
Inferred measurement of other variables

Q)Three measurable pressure

A)Head (hydrostatic) pressure
Static (line) pressure
Vapour pressure

Q)Pressure-measurement devices can be categorised according to
the reference pressure

A)Absolute
Gauge
Differential

Q) Different type liquid column pressure gauges

A) Barometer
Manometer

Q)What are the basic parts of Mechanical pressure gauges ?

A)Sensing device
Mechanical dial or indicator

Q)Most commonly used pressure sensing device?

A)Bourdon tube
Bellows and capsules

Q)What is pneumatic controller ?

A) A pneumatic controller is a device that, in response to an input pressure, sends a pneumatic output to a relay

Q)What is pneumatic transmitter ?

A)A pneumatic transmitter is a device that, in response to input pressure, outputs a proportionate, standardized pneumatic signal.