Materials Science and Manufacturing Engineering Miscellaneous
- The principle of material removal in Electrochemical machining is
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NA
Correct Option: B
NA
- The process utilizing mainly thermal energy for removing material is
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Machining by laser beam is achieved through thermo – optic interaction between the beam and work material.
Correct Option: D
Machining by laser beam is achieved through thermo – optic interaction between the beam and work material.
- The following four unconventional machining processes are available in a shop floor. The most appropriate one to drill a hole of square cross section of 6 mm × 6 mm and 25 mm deep is
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EDM is most suitable process of square holes, intricate triangular holes etc.
Correct Option: D
EDM is most suitable process of square holes, intricate triangular holes etc.
- During the electrochemical machining (ECM) of iron (atomic weight = 56, valency = 2) at current of 1000 A with 90% current efficiency, the material removal rate was observed to be 0.26 cc/s. If Titanium (atomic weight = 48, valency = 3) is machined by the ECM process at the current of 2000 A with 90% current efficiency, the expected material removal rate in gm/s will be
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MRR = AI ρZF 0.26 = 56 × 1000 × 0.9 ρ × 2 × 96500
ρ = 0.9956.Now, Expected MRR = 48 × 2000 × 0.9 0.9956 × 3 × 96500
= 0.30 gm/sCorrect Option: C
MRR = AI ρZF 0.26 = 56 × 1000 × 0.9 ρ × 2 × 96500
ρ = 0.9956.Now, Expected MRR = 48 × 2000 × 0.9 0.9956 × 3 × 96500
= 0.30 gm/s
- Match the following non-traditional machining processes with the corresponding material removal mechanisms:
Machining process
P. Chemical machining
Q. Electro-chemical machining
R. Electro-discharge machining
S. Ultrasonic machining
Mechanism of material removal
1. Erosion
2. Corrosive reaction
3. lon displacement
4. Fusion and vaporization
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P – 2, Q – 3, R – 4, S – 1
Correct Option: A
P – 2, Q – 3, R – 4, S – 1