Advanced Machining Questions and Answers – Electronbeam Machining-Introduction, Equipment and Material removal

This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Electronbeam Machining-Introduction, Equipment and Material removal”.

1. What is the full form of EBM in the advanced machining processes?
a) Electro blast manufacturing
b) Electron beam machining
c) Electron beam manufacturing
d) Electron blast manufacturing
View Answer

Answer: b
Explanation: The full form of EBM is Electron beam machining in the advanced machining processes.

2. The prototype of the machine used in EBM process was first introduced in which year?
a) 1924
b) 1943
c) 1947
d) 1956
View Answer

Answer: c
Explanation: Steigerwald was the scientist who designed a prototype machine of electron beam machining in 1947.

3. When did the Electron beam machining come into the machining industry?
a) 1920s
b) 1930s
c) 1950s
d) 1960s
View Answer

Answer: d
Explanation: The Electron beam machining was introduced to the machining industry in the early 1960s.
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4. Which of the following are the applications of EBM process?
a) Drilling
b) Cutting
c) Engraving
d) All of the mentioned
View Answer

Answer: d
Explanation: Drilling small holes, cutting, engraving, and heat treatment are some of modern applications of Electron beam machining.

5. The tungsten filament cathode is heated to what temperatures in EBM?
a) 1000 to 1500 ᵒC
b) 1500 to 2000 ᵒC
c) 2500 to 3000 ᵒC
d) 3500 to 5000 ᵒC
View Answer

Answer: c
Explanation: The tungsten filament cathode is heated to 2500 to 3000 ᵒC in Electron beam machining.
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6. What are the values of currents used in EBM process?
a) 1 and 20 mA
b) 20 and 100 mA
c) 100 and 200 mA
d) 200 and 400 mA
View Answer

Answer: b
Explanation: The values of the currents used in the Electron beam machining process are between 20 and 100 mA.

7. What are the values of current densities used in the process of EBM?
a) 5 and 15 A/cm2
b) 15 and 20 A/cm2
c) 20 and 30 A/cm2
d) 40 and 60 A/cm2
View Answer

Answer: a
Explanation: The values of the current densities used in EBM lie between 5 and 15 A/cm2.
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8. Emission current depends up on which of the following factors?
a) Cathode material
b) Temperature
c) Voltage supply
d) All of the mentioned
View Answer

Answer: d
Explanation: Emission current depends on the cathode material, temperature, and the high voltage in the process of Electron beam machining.

9. What are the values of voltages used in the EBM process?
a) 10 V
b) 50 V
c) 150 V
d) 200 V
View Answer

Answer: c
Explanation: The values of voltages used in the process of electron beam machining is about 150 V.
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10. Which of the following lenses are used for refocussing the electrons in EBM process?
a) Magnetic lens
b) Electronic lens
c) Magnetic & Electronic lens
d) None of the mentioned
View Answer

Answer: c
Explanation: Magnetic and electronic lenses are used to refocus the electrons in EBM process.

11. What are the values of velocity maintained in the EBM process?
a) 118 x 103 m/s
b) 228 x 103 m/s
c) 338 x 103 m/s
d) 448 x 103 m/s
View Answer

Answer: b
Explanation: The value of the velocity used in the process of electron beam machining is about 228 x 103 m/s.

12. What are the values of power densities used in the EBM process?
a) 0.05 MW/mm2
b) 0.55 MW/mm2
c) 1.55 MW/mm2
d) 2.55 MW/mm2
View Answer

Answer: c
Explanation: The value of the power densities used in the process of electron beam machining are about 1.55 MW/mm2.

13. What is the frequency of the pulse of electrons used in EBM process?
a) 10 Hz
b) 102 Hz
c) 103 Hz
d) 104 Hz
View Answer

Answer: d
Explanation: A pulsed electron beam at 104 Hz reduces the temperature of the work piece outside the region being machined.

14. What are the values of material removal rates in EBM process?
a) 1 mm3/min
b) 10 mm3/min
c) 100 mm3/min
d) 1000 mm3/min
View Answer

Answer: b
Explanation: The values of the material removal rates in the process of electron beam machining are about 10 mm3/min.

15. What are the values of the cavity diameters that are obtained in EBM?
a) 15 to 20 µm
b) 20 to 25 µm
c) 30 to 35 µm
d) 35 to 40 µm
View Answer

Answer: d
Explanation: The values of the cavity diameters range from 35 to 40 µm.

Sanfoundry Global Education & Learning Series – Advanced Machining.

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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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