JET

JET Interview Questions and Answers

Updated 15 Feb 2016

Q1. T-s ,p- v ,h-s diagram of all vapour, gas and refrigeration cycle

Ans.

The T-s, p-v, h-s diagrams are graphical representations of thermodynamic cycles used in vapor, gas, and refrigeration systems.

  • T-s diagram shows the relationship between temperature and entropy

  • p-v diagram shows the relationship between pressure and volume

  • h-s diagram shows the relationship between enthalpy and entropy

  • Vapor cycle includes processes like evaporation, compression, and condensation

  • Gas cycle includes processes like compression, expansion, and heat transfer

  • Refrigera...read more

Q2. Effectiveness equation in heat exchanger

Ans.

The effectiveness equation in heat exchanger determines the efficiency of heat transfer.

  • The effectiveness equation compares the actual heat transfer rate to the maximum possible heat transfer rate.

  • It takes into account the inlet and outlet temperatures of both fluids and the heat capacity rates.

  • The equation is commonly used in designing and optimizing heat exchangers.

  • An example of the effectiveness equation is Q/Qmax = (T1-T2)/(T1-T2s), where Q is the actual heat transfer rat...read more

JET Interview Questions and Answers for Freshers

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Q3. Lmtd equation with derivation

Ans.

The LMTD equation is used to calculate the temperature difference in heat exchangers.

  • LMTD stands for Logarithmic Mean Temperature Difference.

  • It is used to calculate the heat transfer rate in heat exchangers.

  • The equation is: LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)

  • ΔT1 and ΔT2 are the temperature differences between the hot and cold fluids at the inlet and outlet.

  • The LMTD equation assumes that the heat transfer coefficient is constant and that the fluids are well mixed.

  • It is commonly...read more

Q4. Venturi orrifice equation

Ans.

The Venturi orifice equation is used to calculate the flow rate of a fluid through a pipe.

  • It relates the pressure difference between two points in a pipe to the flow rate of the fluid.

  • It is commonly used in industries such as oil and gas, chemical, and water treatment.

  • The equation takes into account the diameter of the pipe, the density of the fluid, and the pressure difference.

  • It can be used to determine the efficiency of a fluid system and to optimize its performance.

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Q5. Iron-carbon diagram

Ans.

The iron-carbon diagram shows the relationship between carbon content and the properties of iron.

  • The diagram is used to determine the microstructure and properties of steel.

  • It shows the phases of iron and the effect of carbon on them.

  • The diagram is divided into regions based on carbon content and temperature.

  • The eutectoid point is important as it represents the lowest temperature at which austenite can transform into pearlite.

  • The diagram is used in the design and production o...read more

Q6. Cavitations in pump

Ans.

Cavitations in pump is a phenomenon where air bubbles form in the liquid due to low pressure, causing damage to the pump.

  • Occurs when the pressure in the pump drops below the vapor pressure of the liquid

  • Can cause erosion, noise, and vibration in the pump

  • Can be prevented by ensuring proper suction pressure and avoiding high-speed operation

  • Examples include water pumps, fuel pumps, and hydraulic pumps

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