Answer / Munendra Pal Singh

1. An Adiabatic Process: An air compressor on a ship utilizes an adiabatic expansion (isentropic) process, where the air is compressed without any heat exchange with its surroundings, resulting in an increase in pressure and temperature (PV^(gamma-1) = constant, where P is pressure, V is volume, and gamma is the specific heat ratio).<br>2. An Isothermal Process: The Joule-Thomson Expander on a ship performs an isothermal expansion, which maintains a constant temperature while reducing pressure and increasing volume (PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature).

A steel column 3 m hight is of hollow square section, 200 mm outside dimension and 20 mm wall thickness. (young's modules E=210*10^9) calculate A: the compressive load which will give a stress of 60 MN/m^2 in column. B: the compression o the column under the load in (A).

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star connection for a 3 phase induction motor gives reduced starting current.but 1.732 times the rated current during run up period if the motor was designed to run on delta. Why can't we design the motors to run on star connection instead. It will remove the starting arrangement required making the construction an operation much simpler.

1 Answers   Synergy, VR Maritime,

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which country level having below the means sea level?

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1) in a ship where do we get the earth is connected to? 2) in a 3 phase supply where does the neutral is connected to in a ship normally? 3) how does we make the best 24v dc wiring for the ship at the bridge panels which mostly work on 24v dc voltage and how do we differentiate its wiring from ac wiring? 4)what is a synchronizer and why do we need it compulsory in a ship? 5) in a blackout condition how does a ship get its back up power?

5 Answers   Ethiopian Maritime, FM, Focus,

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What is the C.C in motorbikes?

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Give an example each of a shipboard use of an adiabatic process and an isothermal process?

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Explain why self closing sounding pipes are used onboard?

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what is motor bike c.c.

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What is the difference between mitsui man and hitachi man.

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What is the melting point of fusible plug?

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Difference between MAN and REVERSING SYSTEM?

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What is the advantage and disadvantages have the small amount of super heat for the refrigerant vapors entering the compressors suctions?

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