1. Which of the following are the applications of EBM?
a) Hole drilling
b) Slotting
c) Perforation of thin sheets
d) All of the mentioned

Explanation: Drilling, perforation of thin sheets, slotting and integrated circuit fabrication are some of the applications of Electron beam machining.

2. What is the value of largest diameter of the hole drilled on EBM?
a) 0.5 mm
b) 1.0 mm
c) 1.5 mm
d) 2.0 mm

Explanation: The maximum value of diameter that can be drilled using Electron beam machining is about 1.5 mm.

3. What is the value of maximum depth of the hole drilled on EBM?
a) 10 mm
b) 20 mm
c) 30 mm
d) 40 mm

Explanation: Value of the maximum depth that can be drilled using Electron beam machining is about 10 mm.

4. What is the range of depth-to-diameter ratio in Electron beam machining?
a) 2:5 to 2:11
b) 1:1 to 1:15
c) 3:4 to 3:20
d) 4:5 to 4:19

Explanation: The depth to diameter ratio in Electron beam machining will vary between 1:1 and 1:15.

5. How many holes can be produced in perforation of thin sheets using EBM?
a) 101 to 102
b) 102 to 103
c) 103 to 104
d) 104 to 105

Explanation: Number of holes produced range from 104 to 105 per second in perforation using EBM.
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6. What is the value of energy required for bond breaking?
a) 10 to 20kV
b) 20 to 30kV
c) 30 to 40kV
d) 40 to 50kV

Explanation: Value of the beam energy used for breaking bonds or cross linking them range from 10 to 20kV.

7. What is the value of pulse time used in EBM?
a) 0.004 to 0.064 µs
b) 0.04 to 0.64 µs
c) 0.4 to 640 µs
d) 4 to 64000 µs

Explanation: Value of the pulse time of beam ranges from 4 to 64000 µs.

8. What is the value of frequency used in EBM?
a) 0.001 – 0.016 Hz
b) 0.01 – 16 Hz
c) 0.1 – 16000 Hz
d) 10 – 1600 kHz

Explanation: The frequency of the pulse range between 0.1 and 16000 Hz in Electron beam machining.

9. What is the tolerance value obtained in EBM?
a) ± 10 %
b) ± 20 %
c) ± 30 %
d) ± 40 %

Explanation: The tolerances obtained in Electron beam machining is about ± 10 % of the depth of cut.

10. Which of the following are the advantages of EBM process?
a) Drilling rates
b) No distortion
c) High accuracy
d) All of the mentioned

Explanation: The main advantages of Electron beam machining are high drilling rates, no mechanical distortion, high accuracy and repeatability.

11. There is no limitation imposed on which of the following factors in EBM?
a) Material ductility
b) Surface hardness
c) Surface reflectivity
d) All of the mentioned

Explanation: In Electron beam machining, no limitation is imposed by work piece hardness, ductility, and surface reflectivity.

12. How much is the capital equipment cost of equipment used in EBM?
a) Very low cost
b) Low cost
c) Moderate cost
d) High cost

Explanation: The capital equipment cost of the Electron beam machining is high compared to other machining processes.

13. How are the production times for a material in electron beam machining?
a) Very small
b) Small
c) Moderate
d) Long

Explanation: In Electron beam machining, long production times are required due to the generation of vacuum in the chamber for machining purpose.

14. Which type of thin cast layer is produced when we use EBM?
a) Thin layer
b) Thick layer
c) No layer
d) All of the mentioned

Explanation: Thin recast layer is produced in Electron beam machining which an added disadvantage to the machining process.

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