1. As the abrasive flow rate increases, what happens to the volumetric removal rate?
a) Increases
b) Decreases
c) Increase and then decrease
d) Decrease and then increase
Explanation: In AJM, volumetric removal rate increases up to a level and then decreases
2. What is the value of abrasive grain flow rate in Abrasive jet machining?
a) 0.1 – 2 g/min
b) 3 – 20 g/min
c) 30 – 56 g/min
d) 68 – 85 g/min
Explanation: Abrasive grain flow rate is between 3 – 20 g/min, in AJM.
3. What must be the velocity of the carrier gas that carries the abrasive particles?
a) 10 – 50 m/sec
b) 50 – 150 m/sec
c) 150 –300 m/sec
d) 300 – 500 m/sec
Explanation: Velocity of abrasive carrier gas must be between 150 – 300 m/sec.
4. What is the value of carrier gas flow rate in Abrasive jet machining?
a) 6 L/min
b) 17 L/min
c) 28 L/min
d) 39 L/min
Explanation: In Abrasive jet machining, the flow rate of abrasive carrier gas is around 28 L/min.
5. Which of the following material/s cannot be used for making of nozzle in Abrasive jet machining?
a) Tungsten Carbide
b) Steel alloy
c) Sapphire
d) Synthetic sapphire
Explanation: Nozzle in Abrasive jet machining is made up of sapphire or WC
6. Which of the following values, does the diameter of the nozzle lies between?
a) 0.01 – 0.10 mm
b) 0.30 – 0.50 mm
c) 0.70 – 0.90 mm
d) 1.10 – 1.50 mm
Explanation: In AJM, Diameter of the nozzle ranges between 0.30 – 0.50 mm.
7. What is the life of Tungsten carbide material nozzle?
a) 1 – 8 hrs
b) 2 – 5 hrs
c) 10 – 15 hrs
d) 25 – 40 hrs
Explanation: Nozzle made up of WC material has a life period which range between 10 – 15 hrs
8. In AJM, what is the life of synthetic sapphire material nozzle?
a) 100 hrs
b) 300 hrs
c) 500 hrs
d) 700 hrs
Explanation: Nozzle made up of synthetic sapphire material has a life period which is about 300 hrs.
9. What are the tolerance limit values in Abrasive water jet machining?
a) ± 0.01 mm
b) ± 0.03 mm
c) ± 0.05 mm
d) ± 0.07 mm
Explanation: In Abrasive jet machining, tolerance limit values range between ± 0.05 mm
10. In AJM, surface roughness value will vary between which values?
a) 0.01 – 0.10 µm
b) 0.15 – 1.5 µm
c) 2.0 – 5.0 µm
d) 7.0 – 10.0 µm
Explanation: Surface roughness value in AJM varies between 0.15 – 1.5 µm, depending on grain size.