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WorksheetsNCM Unit-2 Test
Total questions: 20
Worksheet time: 25mins
In Ultrasonic machining, the material is removed by
anodic dissolution
thermal melting
abrasive action
electrochemical oxidation
In Ultrasonic machining, the tool
moves in transverse direction
moves in longitudinal direction
vibrates in transverse direction
vibrates in longitudinal direction
Increase in abrasive grain size in USM results in
Lower MRR, Higher surface finish
Higher MRR, Lower surface finish
Higher MRR, Higher surface finish
Lower MRR, Lower surface finish
In USM process, which type of material can be easily machined
Glass
Stainless steel
Brass
Mild steel
What type of tool should be used to reduce power requirement during large dimeter hole drilling in USM
Trepanning tool
Annular cutters
Drilling tool
Hypodermic needle
AWJM can be used to cut
Metals
Non-metals
Both a and b
None of the above
For longer life of nozzle in AWJM, what type of material is used
Tungsten carbide
Sapphire
Boron carbide
Stainless steel
In abrasive water jet machining, the abrasive particles are added to the water stream
After it exits the nozzle
Before it enters the pumping unit
Just before it enters the nozzle
While it is in the nozzle
The material removal mechanism in AWJM is
Melting and vaporisation
Erosion or localised stress fields
Ion displacement
Spark erosion
In which process Catcher is used
USM
MAF
AWJM
AJM
Abrasive jet machining is best suited to machine
Brittle materials
Heat sensitive materials
Soft materials
All the above
Material removal in AJM of glass is around
0.1 mm3/min
15 mm3/min
15 mm3/s
1500 mm3/min
Material removal takes place in AJM due to
electrochemical action
mechanical impact
fatigue failure of the material
sparking on impact
With an increase in abrasive particle size in AJM
MRR as well as surface finish increase
MRR decreases but surface finish increases
MRR increases but surface finish decreases.
In Abrasive jet machining, what may be the size of the abrasive grains used?
10 – 40 µm
50 – 100 µm
100 – 150 µm
200 – 300 µm
What is the velocity of water jet stream in water jet machining
100 m/sec
300 m/sec
700 m/sec
900 m/sec
In WJM, what are the properties of jet fluid that affect the MRR?
Velocity
Flow rate
Viscosity
All of the mentioned
In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate
increases continuously.
decreases continuously.
decreases, becomes stable and then increases.
increases, becomes stable and then decreases
AJM nozzles are made of
low carbon steel
HSS
WC
Stainless steel
What are the processes where Abrasive jet machining can be used?
Cutting
Cleaning
Deburring
All of the mentioned
