Q.1
In electron beam gun, vacuum is achieved by _____
  • a) reciprocating pump
  • b) rotary pump only
  • c) combination of rotary pump and diffusion pump
  • d) combination of diffusion pump and vane pump
Q.2
Diffusion pump is an _____
  • a) oil filter equipment
  • b) oil heater
  • c) oil cooler
  • d) oil collector
Q.3
The oil coming out of diffusion pump is evacuated by a _____
  • a) screw pump
  • b) gear pump
  • c) rotary pump
  • d) piston pump
Q.4
High velocity gets of oil vapour coming out of diffusion pump entrain ______ present within the gun.
  • a) water droplets
  • b) oil droplets
  • c) air molecules
  • d) hazardous gas molecules
Q.5
Which of the following parameters do not affect the electron beam machining process?
  • a) Accelerating voltage
  • b) Lens current
  • c) Spot size
  • d) Workpiece material
Q.6
For the electron beam machining process, pulse duration for the electron beam is in range of_____
  • a) 10 μs to 90 μs
  • b) 50 μs to 15 ms
  • c) 80 μs to 10 ms
  • d) 15 ms to 1 s
Q.7
Beam current is in the range of _____
  • a) 50 μamp to 0.8 amp
  • b) 100 μamp to 10 amp
  • c) 200 μamp to 1 amp
  • d) 185 μamp to 1.5 amp
Q.8
Increasing the beam current directly increases the _____
  • a) energy per pulse
  • b) accelerating voltage
  • c) spot size
  • d) lens current
Q.9
In electron beam machining process, the energy density is controlled by spot size.
  • a) True
  • b) False
Q.10
At higher energy densities, material removal rate is high.
  • a) True
  • b) False
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