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What is the grain size of abrasive particles, which are often used for Abrasive water jet machining?
A
0.01 – 0.50 µm
B
10 – 150 µm
C
200 – 500 µm
D
500 – 1000 µm
Correct Answer:
10 – 150 µm
Grain size of the abrasive particles range between 10 – 150 µm in Abrasive water jet machining.
State whether the following statement is true or false, about Abrasive jet machining. “Using Abrasive jet machining, micro deburring of hypodermic needles can take place.”
A
True
B
False
The largest size of immobilised segment of dislocation in a Frank Read (FR) source contained in a polycrystalline material is of the order of grain size. In a metal of 10 μm grain size, the shear stress required to operate such a FR source is 100 MPa. If the grain size in the same metal is reduced to 10 μm, the shear stress required to operate such FR source would be . . . . . . . . MPa.
A
10<sup>2</sup>
B
10<sup>3</sup>
C
10<sup>5</sup>
D
10<sup>6</sup>
When compared to Abrasive water jet machining, how are the material removal rates in Ice jet machining?
A
Very low
B
Low
C
High
D
Remains same
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
In Abrasive jet machining, what may be the size of the abrasive grains used?
A
10 – 40 µm
B
50 – 100 µm
C
100 – 150 µm
D
200 – 300 µm
In order to double its yield strength, the grain size of a steel of ASTM grain size number 2 should be changed to ASTM grain size number (neglect friction stress)
A
1
B
4
C
6
D
8
In Abrasive water jet machining, how are the abrasives fed into the water jet stream?
A
Suspension
B
Injection
C
All of the mentioned
D
None of the mentioned
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
Water Jet Machining (WJM) and Abrasive Jet Micromachining (AJMM or AWJM) can be achieved using how many different approaches?
A
10
B
5
C
7
D
only one approach is there
When compared to the conventional machining, how much times faster, is the Abrasive water jet machining?
A
5 times
B
10 times
C
15 times
D
20 times