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what is a shella shell is an interactive user interface to an operating system services that permits an user to enter commands as character strings
discuss the mount and unmount system callsthe privileged mount system call is used to join a file system to a directory of another file system the
how do you create special files like named pipes and device filesthe system call method forms special files in the following sequencekernel assigns
what is a fifofifo is otherwise known as named pipes fifo first-in-first-out is a particular file which is said to be data transient once data is
q design gas compressorsas gas compressors are often high investment equipment it makes sense to locate these well away from other equipment to
pumps should be grouped together with good maintenance access to the motor and good personnel access to seals and suction discharge valves
what is inodeall unix files have its description kept in a structure called inode the inode have info about the file-size its location time of last
q design pumps for plant layoutpumps handling flammable or combustible materials are relatively frequent sources of leakage and should therefore be
how are devices represented in unixall devices are shown by files called special files that are located in dev directory therefore device files and
q explain working of plate heat exchangersfor gasket plate heat exchangers handling flammable materials the same spacing requirements for air coolers
q design air coolers for plant layoutas air coolers sometimes called aerial coolers or fin-fans have extensive heat transfer surfaces they are more
q what do you mean by shell and tube exchangersshell and tube exchanger piping shall be arranged to provide clearance overhead at both bonnet and
q heat exchangers for plant designall exchangers shall be arranged to be readily dismantled for cleaning and maintenance cooling and heating streams
q safety considerations for storage tankslarge storage tanks are potential fire hazards and should be located at a lower elevation than other
q maintenance requirement at storage tankslittle maintenance is required at storage tanks sometimes access is required for equipment used to remove
q design layout of storage tanks in plantgenerally tanks taking up large areas of the plot are located off-site and storage tanks containing the same
q layout of vessels in plant designlayout of vessels needs to allow sufficient spacing for instruments piping operations maintenance and firefighting
q sewage treatmentunless located in a metropolitan area it is common for plants to have sewage treatment facilities for disposal of sewage and grey
q what is stormwater treatmentnormally stormwater run-off from process areas needs to be collected and treated before being discharged to land or
q waste water treatmenttypically there are a number of waste water streams which need to be treated before disposal to land or water depending on the
q steam and power generation equipmentlocating steam and power generation equipment outside of the process areas ensures that critical facilities
q design ventilation systems for plantwhile some natural ventilation may sometimes be used a pressurized hvac heating ventilation and
q what is air intakesair is drawn from the atmosphere for a variety of process and equipment uses includingbull combustion air fired heaters boilers
q what is passive fire protectionpassive fire protection is defined as any fire protection system that by its nature plays an inactive role in
q design requirements for aircraft accessfor some remote locations provision may be required for occasional landing of aircraft during emergencies or