This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Plasma Beam Machining-Introduction And Machining system”.
1. What is the full form of PBM in the advanced machining processes?
a) Plasma Beam Manufacturing
b) Plasma Beam Machining
c) Plasma Blast Manufacturing
d) Plasma Blast Machining
View Answer
Explanation: The full form of PBM in the advanced machining processes is Plasma Beam Machining.
2. When the Plasma Beam machining process came into the industrial world?
a) 1920s
b) 1930s
c) 1950s
d) 1970s
View Answer
Explanation: The Plasma Beam machining process came into the industrial world in the early 1950s as an alternative for the oxy-gas flame cutting process.
3. PBM is the only process which works faster in ________ steel than _________ steel.
a) Stainless, mild
b) Mild, stainless
c) Remains same all
d) All of the mentioned
View Answer
Explanation: PBM is the only fabrication process which works faster in stainless steels compared to mild steels.
4. What is the temperature reached by cathode in order to produce plasma beam?
a) 12000 ºC
b) 18000 ºC
c) 28000 ºC
d) 40000 ºC
View Answer
Explanation: The temperature reached by cathode to produce plasma arc is about 28000 ºC in Plasma Beam Machining.
5. What is the value of velocity of plasma jet in Plasma beam machining?
a) 100 m/sec
b) 300 m/sec
c) 400 m/sec
d) 500 m/sec
View Answer
Explanation: The value of the velocity of the plasma jet in Plasma beam machining is about 500 m/sec.
6. What is the value of material removal rate in Plasma Beam Machining process?
a) 50 cm3/min
b) 100 cm3/min
c) 150 cm3/min
d) 200 cm3/min
View Answer
Explanation: The values of the material removal rates in Plasma beam machining will be nearly 150 cm3/min.
7. What is the value of specific energy used in Plasma beam machining process?
a) 100 W/(cm3-min)
b) 200 W/(cm3-min)
c) 300 W/(cm3-min)
d) 400 W/(cm3-min)
View Answer
Explanation: The value of the specific energy used in Plasma beam machining process is about 100 W/(cm3-min).
8. What is the value of the power used in PBM process?
a) 0.1 – 10 kW
b) 2 – 200 kW
c) 200 – 400 kW
d) 400 – 700 kW
View Answer
Explanation: The value of the power used in Plasma beam machining range from 2 to 200 kW.
9. What is the value of the voltage used in PBM process?
a) 0.1 – 20 V
b) 30 – 250 V
c) 300 – 400 V
d) 500 – 600 V
View Answer
Explanation: The value of voltage in the Plasma beam machining processes is about 30 – 250 V.
10. What is the value of the current used in PBM process?
a) Up to 200 A
b) Up to 400 A
c) Up to 600 A
d) Up to 800 A
View Answer
Explanation: The value of the current used in PBM will be up to 600 A.
11. What is the value of machining speed used in PBM process?
a) 0.1 – 7.5 m/min
b) 8.5 – 10.5 m/min
c) 15.5 – 19.5 m/min
d) 20.5 – 25.5 m/min
View Answer
Explanation: The value of machining speed is about 0.1 – 7.5 m/min in Plasma beam machining process.
12. What is the maximum value of the thickness used in PBM process?
a) 100 mm
b) 200 mm
c) 300 mm
d) 400 mm
View Answer
Explanation: The maximum value of the thickness used in the Plasma beam machining process is about 200 mm.
13. Which of the following are the different shielded plasmas used in PBM?
a) Gas-shielded plasma
b) Water-shielded plasma
c) Gas-shielded & Water-shielded plasma
d) None of the mentioned
View Answer
Explanation: Both gas-shielded plasma and water shielded plasma are used in the Plasma beam machining process.
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