Question 81-90

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

81)   What are the factors that affect the material removal rate in AJM process?
Ans) Mass flow rate
        Abrasive grain size
        Gas pressure
        Velocity of abrasive particles
        Mixing ratio
        Nozzle tip clearance


82)   What is water jet machining process?
Ans) In WJM process high pressure and high velocity stream of water is used to cut the relatively
softer and non metallic material like paper board, wood , plastic, etc.


83)   State the working principle of hydrodynamic jet machining process
Ans) In HJM process abrasive particles are added to the high velocity stream of water jet and the
material is removed from the workpiece due to the combined effect of abrasion and water
impact

84)   List the unique benefits offered by water jet machining process.
Ans) In this process water is used as energy transfer medium. It is cheap, non toxic and easy to
dispose.
        Low operating cost
        The work area remains clean and dust free.
        Low maintenance cost

85)   List the disadvantage of WJM process.

Ans) Initial cost of WJM process is high

        It is difficult to machine hard materials.

86)   List the applications of WJM process.

Ans) This process is very convenient for cutting relatively softer and non metallic material like paper board, plastic, wood, rubber, leather, etc.

87)   Differentiate abrasive jet machining process and sand blasting process.

Ans) AJM is basically meant for metal removal with the use of small abrasive particles whereas the sand blasting process is a surface cleaning process which does not involve any metal cutting.

88)   State the working principle of ultra sonic machining process.

Ans) In USM process a slurry of small abrasive particles are forced against the work piece by means of vibrating tool and it causes the removal of metal from the work piece in the form of extremely small chips.

89)   What is meant by transducer?

Ans) Transducer is a device which converts one form of energy into another form of energy.

90)   What are the types of transducers used in ultrasonic machining process?

Ans) There are two types of transducers used in ultrasonic machining process for the production of ultrasonic waves. They are:

                           # Magnetostriction transducer

                           # Piezoelectric transducer