Q.1
AJM nozzles are made from which of the following materials?
  • a) Low carbon steel
  • b) HSS
  • c) WC
  • d) Stainless steel
Q.2
Material removal in AJM of glass is around_____
  • a) 0.1 mm3/min
  • b) 15 mm3/min
  • c) 15 mm3/s
  • d) 1500 mm3/min
Q.3
Material removal takes place in AJM due to _____
  • a) electrochemical action
  • b) mechanical impact
  • c) fatigue failure of the material
  • d) sparking on impact
Q.4
As the stand-off distance increases, the depth of penetration in AJM _____
  • a) increases
  • b) decreases
  • c) does not change
  • d) initially increases and then remains steady
Q.5
If air is used as a carrier gas, the pressure of the air is maintained at around_____
  • a) 1 bar
  • b) 3 bar
  • c) 5 bar
  • d) 3.5 bar
Q.6
The mass flow rate of abrasive entering the chamber is independent of the amplitude of vibration of the sieve (in the mixing chamber).
  • a) True
  • b) False
Q.7
In AJMM, impingement angle is kept approximately in range of_____
  • a) 100 ~ 200
  • b) 300 ~ 450
  • c) 600 ~ 900
  • d) 500 ~ 600
Q.8
Which of the following is used as abrasive in AJMM?
  • a) Al2O3
  • b) HNO3
  • c) FeC
  • d) CaCO3
Q.9
Which of the following assumption is true about AJMM?
  • a) Abrasives are irregular in shape.
  • b) The abrasive particles are characterised by the mean grit diameter
  • c) Brittle materials are considered to fail due to fatigue
  • d) The kinetic energy of the abrasives is partially lost in overcoming the friction in the nozzle
Q.10
By AJMM, holes of intricate shapes can be drilled easily.
  • a) True
  • b) False
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