73 practice sets · Page 4 of 4
How are the production times for a material in electron beam machining?
Very small
Long
Small
Moderate
Correct Answer: B — Long
Explanation:
In Electron beam machining, long production times are required due to the generation of vacuum in the chamber for machining purpose.
How much is the capital equipment cost of equipment used in EBM?
Moderate cost
Low cost
High cost
Very low cost
Correct Answer: C — High cost
Explanation:
The capital equipment cost of the Electron beam machining is high compared to other machining processes.
There is no limitation imposed on which of the following factors in EBM?
Surface reflectivity
Surface hardness
All of the mentioned
Material ductility
Correct Answer: C — All of the mentioned
Explanation:
In Electron beam machining, no limitation is imposed by work piece hardness, ductility, and surface reflectivity.
Which of the following are the advantages of EBM process?
All of the mentioned
No distortion
Drilling rates
High accuracy
Correct Answer: A — All of the mentioned
Explanation:
The main advantages of Electron beam machining are high drilling rates, no mechanical distortion, high accuracy and repeatability.
What is the tolerance value obtained in EBM?
± 40%
± 30%
± 20%
± 10%
Correct Answer: D — ± 10%
Explanation:
The tolerances obtained in Electron beam machining is about ± 10 % of the depth of cut.
What is the value of frequency used in EBM?
10 – 1600 kHz
0.001 – 0.016 Hz
0.1 – 16000 Hz
0.01 – 16 Hz
Correct Answer: C — 0.1 – 16000 Hz
Explanation:
The frequency of the pulse range between 0.1 and 16000 Hz in Electron beam machining.
What is the value of pulse time used in EBM?
0.04 to 0.64 µs
0.004 to 0.064 µs
0.4 to 640 µs
4 to 64000 µs
Correct Answer: D — 4 to 64000 µs
Explanation:
Value of the pulse time of beam ranges from 4 to 64000 µs.
What is the value of energy required for bond breaking?
10 to 20kV
40 to 50kV
20 to 30kV
30 to 40kV
Correct Answer: A — 10 to 20kV
Explanation:
Value of the beam energy used for breaking bonds or cross linking them range from 10 to 20kV.
How many holes can be produced in perforation of thin sheets using EBM?
103 to 104
104 to 105
101 to 102
102 to 103
Correct Answer: B — 104 to 105
Explanation:
Number of holes produced range from 104 to 105 per second in perforation using EBM.
What is the range of depth-to-diameter ratio in Electron beam machining?
4:5 to 4:19
1:1 to 1:15
2:5 to 2:11
3:4 to 3:20
Correct Answer: B — 1:1 to 1:15
Explanation:
The depth to diameter ratio in Electron beam machining will vary between 1:1 and 1:15.
What is the value of maximum depth of the hole drilled on EBM?
40 mm
20 mm
30 mm
10 mm
Correct Answer: D — 10 mm
Explanation:
Value of the maximum depth that can be drilled using Electron beam machining is about 10 mm.
What is the value of largest diameter of the hole drilled on EBM?
2.0 mm
1.0 mm
0.5 mm
1.5 mm
Correct Answer: D — 1.5 mm
Explanation:
The maximum value of diameter that can be drilled using Electron beam machining is about 1.5 mm.
Which of the following are the applications of EBM?
Perforation of thin sheets
Slotting
Hole drilling
All of the mentioned
Correct Answer: 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.
