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q permanent repairs to rail fracturei if the fracture is such that wide gap a t welding ban be adopted then the total length of fractured ends to-be
q temporary repairs to rail fractureif a welding party is not readily available the fracture shall be repaired by using a cut-rail not less than 4
q explain emergency repairs to rail fractureemergency repairs - the fractured rails shall be joined by using the arrangements clamps fish plates if
q explain stages of attending to rail fracturevarious stages of attending to rail fracture weld failure in a lwr track in field -equipment required
q explain gap survey and adjustment of gapgap survey and rectification of gaps is to be carried out in stretches where track develops excessive creep
explain measured shovel packingmeasured shovel packing essentially consists of accurate measurements of track defects particularly the unevenness and
q write short note on skv process of thermit weldingthis term is used for welding by alumino thermic process with short preheat time the time
q explain in details the various operations involved in through packing - conventional maintenance by beater packingexplain the various operations as
q what is the minimum prescribed track structure for lwr cwr on broad gauge ans-1 general - the minimum length of lwr depends upon -irange of
q what do you mean by distressingdistressing is the operation under taken with or with out rail tensors to secure stress free condition in the lwr at
q what is long welded raillong welded rail is a welded rail the central part of which dose not under go any longitudinal movement due to temperature
q explain the process of directed track maintenancedtm is a method to maintain the track is directed every day and not as a prescribed routine dtm
q what is unimat machinethe machine has got 16 independently tiltable tamping tools which enable the machine to work on points and crossing as well
q what is portal cranesthe portal crane is a hydraulically driven four wheeled machine and is meant for carrying sleepers or track panels the power
q what is objective method of assessmenttrack recording consists of objective method of assessment of the quality of track with the help of
q illustrate weld failures in trackthese are failures occurring to defects in welding the joint these defects are either because of improper
q explain flash butt weldingin this process the ends of two rails are kept at fixed distance apart and a mould designed to suit the rail section is
q explain about junction fetthe jfet is a three-terminal voltage-controlled current device whereas the bjt is principally a three-terminal
q working of field-effect transistorsfield-effect transistors fets may be classified as jfets junction field-effect transistors depletion mosfets
given that a bjt has beta 60 an operating point defined by icq 25 ma and an early voltage va 50 v find the small-signal equivalent circuit
consider the common-emitter bjt circuit shown in figure a the static characteristics of the npn silicon bjt are given in figure b along with the load
q illustrate breakpoint analysiswhen a circuit consists of two or more ideal diodes it will have several distinct operating conditions resulting from
consider a forward-biased diode with a load resistance let the static volt-ampere characteristic of the diode be given by equations and typically
q what is elementary diode circuitssemiconductor diodes are used in a wide variety of applications their usage abounds in communication systems
q what is pure semiconductorspure semiconductors known as intrinsic semiconductors have very few charge carriers and may hence be classified as