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WorksheetsQUIZ-2_ECM,EDM,EBM,LBM
Total questions: 25
Worksheet time: 5mins
For fine hole drilling and contour machining, which process is used?
EBM
ECM
LBM
EDM
The function of dielectric fluid in EDM is
Acts as an insulator
Keeps the spark region and work piece cool
Maintains a constant resistance in the gap
all of the above
In EBM, the focusing of electrons is done
electrically
optically
magnetically
mechanically
The velocity of electrons in EBM is
Speed of light
Half the speed of light
One-third the Speed of light
Three-fourth the Speed of light
Time required for conventional machining process as compared to EDM is
More
Less
Same
A variable factor
In Laser beam machining process the wavelength of beam used is
4-6 μ m
3-5 μ m
0.4-0.6 μ m
0.1-0.2 μ m
Trepanning is a process
Tapping internal screw threads
Producing a hole by removing metal along the circumference of tool
Tapping external threads
Smoothing and squaring the surface around hole for a nut
Under cutting is
Done at end of thread to provide clearance for tool
A process of cutting extra deep threads
A process of cutting deep grooves
None of these
Which of the following has highest voltage requirement?
EBM
LBM
ECM
EDM
Major draw back of EDM process is that
It has very high capital cost
Power consumption is very high
Wear takes place at electrode at each spark
Material removal rate is very less
The source of energy in ECM is
Electric spark
Chemical
Electrical
Mechanical
The reason behind using non traditional machining is to get
High accuracies
High strength alloys
Complex surface along with good finish
All of the these
Which of the following does not effect metal removal rate in EDM?
Diameter of crater
Frequency of charge
Dielectric Fluid
Filter
Non stationary behaviour of ECM is due to, which of the factors below?
Gas generation
Heating
Passivation
All of the mentioned
What happens to the product cycle time, if the machining performance is improved in ECM?
Increases
Decreases
Remains same
None of the mentioned
How is material removed in Electro discharge machining?
Mechanical erosion takes place
Melt and evaporate
Corrode and break
None of the mentioned
State whether the following statement is true or false regarding EDM.
“In EDM, negative ions (electrons) collide with positive ions to generate heat.”
TRUE
FALSE
After the explosion is over, how is the debris carried away?
Evaporation
Old dielectric
All of the mentioned
Fresh dielectric
The layer formed when unexpelled molten metal solidifies in EDM is known as _______________
Reabsorbed layer
Recast layer
Unevaporated layer
Condensed layer
Which of the following are the properties of a laser?
Highly collimated
Monochromatic
Coherent light beam
All of the mentioned
Machining of LBM takes place when power density is ____________ than what is lost by conduction and radiation.
Greater
Smaller
Lower
Same as
Which types of lasers are used in Laser beam machining?
Continuous wave
Pulsed mode
Continuous wave & Pulsed mode
None of the mentioned
Laser beam machining uses which type of power sources for machining?
Very low power
Low power
Medium power
High power
Which of the following are different types of lasers used in Laser beam machining?
Solid-state ion
Neutral gas
Semiconductor
All of the mentioned
There is no limitation imposed on which of the following factors in EBM?
Material ductility
Surface hardness
Surface reflectivity
All of the mentioned
