P.T. MCQ TEST

Which one of the following statements is correct in respect of unconventional machining<br />processes?

• The cutting tool is in direct contact with the job
• The tool material needs to be harder than the job material
• The tool is never in contact with the job
• There has to be a relative motion between the tool and the job

As tool and work are not in contact in EDM process

• no relative motion occurs between them
• no wear of tool occurs
• no power is consumed during metal cutting
• no force between tool and work occurs

In Electro-Discharge Machining (EDM), the tool is made of

• Copper
• High Speed Steel
• Cast Iron
• Plain Carbon Steel

The mechanism of material removal in EDM process is

• Melting and Evaporation
• Melting and Corrosion
• Erosion and Cavitation
• Cavitation and Evaporation

In ECM, the material removal is due to

• corrosion
• erosion
• fusion
• ion displacement

Selection electrolyte for ECM is as follows:

• non-passivating electrolyte for stock removal and passivating electrolyte for finish control
• Passivating electrolyte for stock removal and non-passivating electrolyte for finish control
• Selection of electrolyte is dependent on current density
• Electrolyte selection is based on tool- work electrodes

By which one of the following processes the metering holes in injector nozzles of diesel can be made by

• USM
• AJM
• EBM
• CM

Which one of the following processes does not cause tool wear?

• USM
• ECM
• EDM
• Anode mechanical machining

Electric discharge machining imposes larger forces on tool than Electrochemical machining.<br />The above statement is

• true
• false
• cant say
• insufficient data

Electric discharge machining is more efficient process than Electrochemical machining for<br />producing large non-circular holes.

• true
• false
• cant say
• insufficient data