1 Which of the following is not a process parameter of Abrasive water jet machining?
a) Frequency of vibration
b) Orifice diameter
c) Pressure
d) Stand-off distance
Explanation: Frequency of the vibrations does not belong to the parameters of Abrasive water jet machining.
2. Which of the following come under the process parameters of the Abrasive water jet machining?
a) Abrasive size
b) Machine impact angle
c) Traverse speed
d) All of the mentioned
Explanation: All the parameters mentioned above come under Abrasive water jet machining.
3. What is the value of orifice diameter in Abrasive water jet machining?
a) 0.01 – 0.03 mm
b) 0.03 – 0.09 mm
c) 0.10 – 0.30 mm
d) 0.30 – 0.90 mm
Explanation: The value of diameter of the orifice should range between 0.10 – 0.30 mm.
4. Of the following values, between which of them pressure value will range?
a) 1000 – 1500 bar
b) 1500 – 2500 bar
c) 2500 – 4000 bar
d) 4000 – 10000 bar
Explanation: In Abrasive water jet machining, pressure value will range between 2500 – 4000 bar.
5. When compared to sand, how much effective is garnet as abrasive material in AWJM?
a) 20%
b) 30%
c) 40%
d) 50%
Explanation: Garnet, which is commonly used abrasive material is nearly 30% more effective than sand in Abrasive water jet machining.
6. State whether the following statement is true or false about Abrasive water jet machining.
“A material, whose material removal rate is higher, produces larger surface roughness.”
a) True
b) False
Explanation: As rate of material removal increases in AWJM, large surface roughness are produced.
7. Surface roughness depends on which of the following parameters in Abrasive water jet machining?
a) Work piece material
b) Grit size
c) Abrasive type
d) All of the mentioned
Explanation: All the parameters mentioned above, are responsible for variation in surface roughness.
8. What is the value of focusing diameter in Abrasive water jet machining?
a) 0.1 – 0.6 mm
b) 0.8 – 1.4 mm
c) 1.6 – 2.8 mm
d) 3.2 – 5.2 mm
Explanation: Diameter value of WC focusing tube in AWJM varies between 0.8 – 1.4 mm.
9. Abrasive flow value in Abrasive water jet machining will range between which of the following values?
a) 0.01 – 0.1 kg/min
b) 0.1 – 1.0 kg/min
c) 1.0 – 10 kg/min
d) 10 – 100 kg/min
Explanation: In AWJM, abrasive flow ranges between 0.1 – 1.0 kg/min.
10. What is the value of stand-off distance in Abrasive water jet machining?
a) 1.0 – 2.0 mm
b) 2.0 – 4.0 mm
c) 4.0 – 6.0 mm
d) 6.0 – 10.0 mm
Explanation: Stand-off distance in Abrasive water jet machining will vary between 1 – 2 mm.