Advanced Machining Questions and Answers – Electrostream (Capillary) Drilling

This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Electrostream (Capillary) Drilling”.

1. In advanced machining processes, what is the full form of ES drilling?
a) Electro stream
b) Electrical shaped
c) Electron shaped
d) Electric shock
View Answer

Answer: a
Explanation: In advanced machining processes, full form of ES drilling is Electrostream drilling.

2. This Electrostream drilling is used when we cannot drill which of the following type of holes?
a) Too deep holes by EDM
b) Small holes by STEM
c) All of the mentioned
d) None of the mentioned
View Answer

Answer: c
Explanation: ES drilling is used to drill finer holes which are too deep to be produced by EDM and too small to be drilled by STEM.

3. What is the value of diameter of glass nozzle used in Electrostream drilling?
a) 0.01 – 0.02 mm
b) 0.025 – 0.5 mm
c) 0.5 – 0.75 mm
d) 0.75 – 1.25 mm
View Answer

Answer: b
Explanation: Electrostream drilling uses a gas nozzle, whose diameter ranges between 0.025 – 0.5 mm.
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4. Compared to the required diameter of the hole, how is the nozzle diameter?
a) Smaller
b) Larger
c) Same as required
d) All of the mentioned
View Answer

Answer: a
Explanation: The diameter of nozzle used is smaller than the hole size required to be drilled in work piece.

5. Which of the following acts as the cathodic tool in ES drilling?
a) Titanium base
b) Platinum wire
c) Glass nozzle
d) Work piece
View Answer

Answer: b
Explanation: Unlike the case of STEM process, which uses coated Ti tube as cathode, ES drilling used platinum wire as cathode electrode.
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6. What is the concentration of electrolytes that are commonly used in ES drilling?
a) 1 to 10wt %
b) 12 to 20wt %
c) 23 to 30wt %
d) 34 to 50wt %
View Answer

Answer: b
Explanation: Commonly used electrolytes have a concentration between 12 to 20wt %.

7. State whether the following statement is true or false regarding ES drilling.
“In ES drilling, hydrochloric acid is used for machining aluminium and its alloys.”
a) True
b) False
View Answer

Answer: a
Explanation: Hydrochloric acids are used for machining Al and its alloys and sulphuric acid is recommended for other metals.
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8. Which of the following are the metals, which can be machined using sulphuric acid?
a) Carbon steels
b) Haste alloy
c) Inconel
d) All of the mentioned
View Answer

Answer: d
Explanation: Haste alloy, Rene alloy, Inconel, carbon and stainless steels are the materials machined using sulphuric acid.

9. What are the values of electrolyte pressure recommended for ES drilling?
a) 50 – 100 kPa
b) 100 – 250 kPa
c) 275 – 400 kPa
d) 500 – 750 kPa
View Answer

Answer: c
Explanation: Electrolyte pressure values must range between 275 – 400 kPa for ES drilling to take place.
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10. Which of the following parameters must be carefully monitored for satisfactory machining?
a) Acid temperature
b) Pressure
c) Concentration
d) All of the mentioned
View Answer

Answer: d
Explanation: Acid temperature, pressure, concentration and feed rate are to be carefully monitored for satisfactory machining.

11. What are the values of voltages used in ES drilling process?
a) 10 to 40 V
b) 40 to 70 V
c) 70 to 150 V
d) 150 to 300 V
View Answer

Answer: c
Explanation: Voltage values used in ES drilling, range between 70 to 150 V.

12. What are the values of feed rates used in ES drilling process?
a) 0.01 to 0.5 mm/min
b) 0.75 to 2.5 mm/min
c) 3 to 4.5 mm/min
d) 5 to 7.5 mm/min
View Answer

Answer: b
Explanation: Feed rate values used in ES drilling, range between 0.75 to 2.5 mm/min.

13. Higher material removal rates are associated with _________ feed rates and _________ tool diameters.
a) Larger, smaller
b) Smaller, larger
c) Smaller, smaller
d) Larger, larger
View Answer

Answer: d
Explanation: Rates of material removal are high, when feed rates are high and larger tool diameters.

14. What are the normal hole depth tolerance values in ES drilling?
a) ± 0.03 mm
b) ± 0.05 mm
c) ± 0.07 mm
d) ± 0.09 mm
View Answer

Answer: b
Explanation: The normal hole depth tolerances obtained in ES drilling, range between ± 0.05 mm.

15. How many holes can be drilled simultaneously using ES drilling process?
a) One hole
b) Two holes
c) Three holes
d) Multiple holes
View Answer

Answer: d
Explanation: Depending upon the size of diameters, multiple holes can be drilled using ES drilling.

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]

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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.

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