JET
JET Interview Questions and Answers
Q1. T-s ,p- v ,h-s diagram of all vapour, gas and refrigeration cycle
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
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
Q3. Lmtd equation with derivation
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
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.
Q5. Iron-carbon diagram
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
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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