WorksheetsUnit 3: Unconventional Machining Processes
Total questions: 20
Worksheet time: 10mins
Which process uses high-intensity photons for machining?
EBM
PAM
LBM
EDM
Laser Beam Machining removes material mainly by:
Melting and vaporization
Plastic deformation
Chemical reaction
Chipping
The electrolyte commonly used in ECM is:
Kerosene
Sodium chloride solution
Compressed air
Ferric chloride
The carrier gas in AJM is usually:
Oxygen
Nitrogen
Air or CO2
Hydrogen
AJM is best suited for:
Ductile materials
Brittle materials like glass and ceramics
Soft plastics
All materials equally
The most common laser used in machining is:
Ruby laser
CO2 laser
Diode laser
Nd:YAG laser
An advantage of WJM is:
Heat-affected zone is formed
No tool wear and no thermal damage
Electrical conductivity required
Limited to conductive materials only
Abrasive Jet Machining uses:
Water jet only
High velocity gas with abrasive particles
Plasma arc
Ultrasonic vibrations
The material removal mechanism in USM is:
Erosion due to abrasive particle impact
Melting
Electrolysis
Chemical reaction
Plasma Arc Machining (PAM) temperature range is approximately:
200°C
2000°C
200,000°C
20,000°C
In USM, the tool vibrates at a frequency of about:
50 Hz
20 kHz
2000 Hz
100 MHz
Plasma is defined as:
Ionized gas with free electrons and ions
Superheated gas
Liquid metal
Solidified gas
In EDM, the dielectric fluid is usually:
Air
Water
Kerosene or deionized water
Nitrogen
Which process uses a high voltage spark discharge for material removal?
EDM
ECM
CHM
PAM
In Chemical Machining, material is removed by:
Abrasive impact
Spark erosion
Selective chemical dissolution
High-speed jet
In AJM, material removal rate (MRR) depends on:
Gas pressure, abrasive size, and stand-off distance
Tool hardness
Workpiece conductivity
Electrolyte concentration
In Electrochemical Machining, material is removed by:
Electrochemical dissolution
Melting
Evaporation
Chipping
The nozzle material in WJM is generally:
Mild steel
Brass
Aluminium
Tungsten carbide
Electron Beam Machining requires:
High-pressure gas chamber
Vacuum chamber
Electrolyte bath
Magnetic field only
A major limitation of Electrochemical Machining is:
Burr formation
Tool wear is very high
Only non-conductive materials can be machined
High initial investment and electrolyte disposal problem
