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Technical Interview Questions - 15 contains questions about vacuum scale,  perfect vacuum, RTD, electrical resistance,  P&ID abbreviations,  P&ID.

151. Why do we use vacuum scale?
152. What reading on a mercury vacuum gauge corresponds with the Atmospheric pressure?
153. What is a perfect vacuum?
154. What is RTD?
155. What is the unit of electrical resistance?
156. Expand the P&ID abbreviations?
157. Find the following from P&ID?
158. What is a mixture? Give two examples.
159. What happens to the volume of gas from one stage to the next stage?
160. At what temperature the movement of molecules completely stops?

151. Why do we use vacuum scale?

Vacuum scale is used to measure pressure in vessels which are below atmospheric (Absolute).

152. What reading on a mercury vacuum gauge corresponds with the Atmospheric pressure?

Zero in Vacuum gauge is equal to the atmospheric pressure.

153. What is a perfect vacuum?

Zero pressure absolute Psia equals the pressure in a perfect vacuum.

154. What is RTD?

RTD is resistance Temperature Detector. (Heat creates by Electrical Resistance). Increase the heat means increases the resistance.

155. What is the unit of electrical resistance?

Unit of electrical resistance is Ohms at 0 oC .

156. Expand the P&ID abbreviations?

  • FSH Flow switch high,
  • FR Flow recorder
  • FRC Flow recorder Controller
  • FIC Flow indicating Controller
  • PR Pressure recorder
  • PRV Pressure Relief Valve
  • TSV Temperature safety valve
  • ESD Emergency Shut Down
  • PDIC Pressure differential indicating controller
  • PCV Pressure control valve
  • FCV Flow control valve
  • TCV Temperature control valve
  • LCV Level control valve
  • PSHH Pressure switch high high
  • FSHH Flow switch high high
  • TSHH Temp. Switch high high
  • PSLL Pressure switch low low
  • LO Lock open
  • LC Lock closed
  • TIC Temperature indicating controller
  • CSO Car Seal Open (valve sealed and kept in OPEN position)
  • CSC Car Seal Closed (valve sealed and kept in CLOSED condition)

157. Find the following from P&ID?

  • Pipe line specifications
  • Fail open valves
  • Fail closed valves
  • Restricted orifice plates
  • Lock open valve
  • Lock closed valves
  • Piping insulation
  • Pneumatic inst. Signal lines
  • Level controller
  • Level relay switch
  • Pressure control valves
  • Reducers
  • Shutdown valves
  • Spectacle blinds
  • Reciprocating pump
  • Pulsation damper

158. What is a mixture? Give two examples.

Mixture is a composition of two or more molecules of an element that are not chemically bonded and can be physically separated.

159. What happens to the volume of gas from one stage to the next stage?

Volume reduces when compressed gas move out from one stage to the next stage.

160. At what temperature the movement of molecules completely stops?

At absolute zero temperature.

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Thanks for reading - Technical Interview Questions - 15
Naitik Patel
Industrial Guide

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