Advanced Machining Questions and Answers – AJM – Material Removal Rate and Process parameters

This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “AJM – Material Removal Rate and Process parameters”.

1. In AJM, what is the mechanism of removal of material from the work piece?
a) Corrosion
b) Abrasion
c) Electron transfer
d) Vaporization
View Answer

Answer: b
Explanation: In Abrasive jet machining, the removal of material takes places by mechanical abrasion, using abrasive grains.

2. In AJM, abrasive jet from the nozzle follows, which type of path for a short distance?
a) Parallel
b) Inclined
c) Perpendicular
d) None of the mentioned
View Answer

Answer: a
Explanation: Abrasive particles follow a parallel path for short distance and then flare outward.

3. Which of the following components, influence the material removal rate in Abrasive jet machining?
a) Nozzle
b) Carrier gas
c) Abrasive grains
d) All of the mentioned
View Answer

Answer: d
Explanation: All the components mentioned above, influence the rate of material removal, directly or indirectly.
advertisement
advertisement

4. In the following properties of nozzle, which of them does not influence the MRR?
a) Size
b) Wear
c) Outside temperature
d) Distance from work piece
View Answer

Answer: c
Explanation: The outside temperature of nozzle has no influence on the material removal rate.

5. In the following properties of abrasive grains, which of them changes rate of material removal?
a) Size
b) Strength
c) Shape
d) All of the mentioned
View Answer

Answer: d
Explanation: The above mentioned properties of abrasive grains influence the material removal rate.

6. 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
View Answer

Answer: c
Explanation: In AJM, volumetric removal rate increases up to a level and then decreases.

7. 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
View Answer

Answer: b
Explanation: Abrasive grain flow rate is between 3 – 20 g/min, in AJM.
advertisement

8. 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
View Answer

Answer: c
Explanation: Velocity of abrasive carrier gas must be between 150 – 300 m/sec.

9. 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
View Answer

Answer: c
Explanation: In Abrasive jet machining, the flow rate of abrasive carrier gas is around 28 L/min.
advertisement

10. 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
View Answer

Answer: b
Explanation: Nozzle in Abrasive jet machining is made up of sapphire or WC.

11. 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
View Answer

Answer: b
Explanation: In AJM, Diameter of the nozzle ranges between 0.30 – 0.50 mm.

12. 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
View Answer

Answer: c
Explanation: Nozzle made up of WC material has a life period which range between 10 – 15 hrs.

13. In AJM, what is the life of synthetic sapphire material nozzle?
a) 100 hrs
b) 300 hrs
c) 500 hrs
d) 700 hrs
View Answer

Answer: b
Explanation: Nozzle made up of synthetic sapphire material has a life period which is about 300 hrs.

14. 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
View Answer

Answer: c
Explanation: In Abrasive jet machining, tolerance limit values range between ± 0.05 mm.

15. 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
View Answer

Answer: b
Explanation: Surface roughness value in AJM varies between 0.15 – 1.5 µm, depending on grain size.

Sanfoundry Global Education & Learning Series – Advanced Machining.

To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.