Question 71-80

Mechanical engineering interview questions with answers which are asked by HR and in technical rounds.

71)   What are the abrasives used in AJM process?
Ans) The various abrasive particles used in AJM process are aluminum oxide, silicon carbide, glass powder dolomite and specially prepared sodium bicarbonate.

72)   What are the materials used for nozzle manufacturing in AJM process?
Ans) Tungsten carbide
        Synthetic sapphire

73)   What is the average life of nozzle made by Tungsten carbide?
Ans) 12-20 hours

74)   What is the average life of nozzle made by synthetic sapphire?
Ans) 300 hours


75)   Name the carrier gases used in AJM process?
Ans) Nitrogen
        Carbon dioxide
        Helium
        Compressed air

76)   What are the desirable properties of carrier gas in AJM
Ans) It should be cheap
        It should be non toxic
        It should be easily available
        It should dry quickly

77)   What are the transfer medium in AJM?
Ans) Nitrogen
        Carbon dioxide
        Helium
        Compressed air

78).  List any four advantages of AJM process.

Ans) # This process is suitable for cutting all materials.

        # Even diamond can be cut.

        # Initial investment is low.

        # It can be used to cut intricate hole shapes in hard materials.

79).  List any two disadvantages of AJM.

Ans) # Material removal rate is slow.

        # Soft material cannot be machined.

80).  What are the applications of AJM process?

Ans) #Machining hard and brittle materials like quartz.

        # Fine drilling

        # Microwelding

        # Machining of semiconductors.