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Technical Interview Questions - 14 blog contains interview questions about Heat,  principle of heat transfer,  hazardous area classification drawing, natural gas,  viscosity,  pressure.

141. Why do we treat lowers API gravity crude to meet product specification?
142. What is heat?
143. What is the basic principle of heat transfer?
144. What is the effect of boiling point in relation with pressure?
145. What happens to vapor pressure when it reaches to boiling point?
146. What is the purpose of a hazardous area classification drawing?
147. What is a natural gas?
148. Why do we consider methane is the lightest gas?
149. What is viscosity?
150. What is pressure? How do you calculate pressure of 100 pound block measuring 25 Square inches on each side?

141. Why do we treat lowers API gravity crude to meet product specification?

Lower API crude requires high temperature and longer retention time to meet proper oil product specification.

142. What is heat?

It is an energy associated with the motion of molecules in a substance.

143. What is the basic principle of heat transfer?

Heat transfer is the transfer of heat from hot place to cold place.

144. What is the effect of boiling point in relation with pressure?

Boiling point increases at high pressure and decreases at low pressure.

145. What happens to vapor pressure when it reaches to boiling point?

At boiling point vapor pressure of a liquid equalizes to the pressure of the surrounding atmosphere.

146. What is the purpose of a hazardous area classification drawing? Give examples of Zone 0, Zone 1 and Zone 2

Hazardous areas are classified as

  • Zone 0 (Class 0)
  • Zone 1 (Class 1)
  • Zone 2 (Class 2)

Examples of Zone 0, Zone 1 and Zone 2

Zone 0 = Always air fuel mixture is continuously present.

Example: Tank vents, Sump vents, Drains etc.

Zone 1 = Air fuel mixture is present during normal operations.

Example: Pipe line flanges, Inlet manifold areas. (Flange joints are the weaker areas in a process system that may cause leak during abnormal Operation).

Zone 2 = Air fuel mixture is may present during abnormal operations.

Example: Welded pipelines where there are no flange joints. This area reduces the chances of leaks. Flare lines, welded hydrocarbon pipelines where there are no flanges.

147. What is a natural gas?

Natural gas is produced from organic compounds or hydrocarbons during the process of crude oil / gas production operations from an oil reservoir.

148. Why do we consider methane is the lightest gas?

Methane has only one carbon atom.

149. What is viscosity?

Viscosity is the resistance of a liquid to flow.

150. What is pressure? How do you calculate pressure of 100 pound block measuring 25 Square inches on each side?

Pressure is the measure of force applied to a unit area. 

Pressure = Force/Area

100/25 = 4 psi.

Thanks for reading - Technical Interview Questions - 14
Naitik Patel
Industrial Guide

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