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Wednesday, 18 April 2012

Important basic concepts in Production technology and Foundry (GATE-2018) Part-3

The present post (Part-3) contains the important basic concepts in Production technology in Mechanical Engineering. Note down each concept which might help in GATE 2018 Mechanical.


  • The purpose of the riser is to help feed the casting until all solidification takes place.
  • A silver refers to the temperature of equilibrium between solid silver and liquid silver at normal atmospheric pressure.
  • The gold point refers to 10630C.               
  • The silver point refers to 960.500C.
  • Rotameter is used for flow of liquids and gases.
  • The impedance of piezo-electric crystal is high.
  • Hotwire anemometers are generally used for measuring the velocity of air stream.
  • Scale sensitivity is defined as the ratio of a change in scale reading to the corresponding change in pointer deflection.
  • In carthias process, cavity is filled with a pre-calculated quantity of metal and a core or plunger is inserted to force the metal into cavity.
  • In slush casting process metal is poured in to die cavity, and after a predetermined time the mold is inverted to permit a part of metal still in molten to flow out of the cavity.
  • Ornaments are cast by gravity casting.
  • During MIG welding the metal is transferred in the form of fine spray of metal.
  • A collimated light beam is used for producing heat in laser welding.
  • Wipping is the process of connecting loss pipes by soldering alloy.
  • In water jet machining process hydraulic fluid acts as transfer media.
  • The power consumption in ultrasonic machining in kW/cm3/min is of the order of 10 kW/m3/min.
  • Sweep pattern is used for molding parts having uniform symmetrical shape.
  • The helix angle on a HSS (High-Speed Steel) twist drill for drilling cast iron is of the order of 24-320.
  • The usual value of helix angle of a drill is 300.
  • A twist drill is specified by shank, material, and diameter.
  • The broaching operation is generally used in the automobile industry as semi-skilled operators can be employed.
  • For proper broaching operation, at least three number of teeth should be in the work at a time.



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