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Mechanical Engineering Exam  >  Mechanical Engineering Notes  >  Manufacturing Engineering  >  GATE Past Year Questions: Nonconventional Machining (ECM, EDM, ASM, USM)

GATE Past Year Questions: Nonconventional Machining (ECM, EDM, ASM, USM)

MULTIPLE CHOICE QUESTION

Try yourself:  In ECM the MRR is due to

[2001]

A

Corrosion

B

Erosion

C

Fusion

D

Ion displacement

MULTIPLE CHOICE QUESTION

Try yourself:  Deep hole drilling of small diameter, say 0.2 mm is done with EDM by selecting the tool material as

[2000]

A

Copper wire

B

Tungsten wire

C

Brass wire

D

Tungsten carbide

MULTIPLE CHOICE QUESTION

Try yourself: Choose the correct statement

[ME 1999 : 1 Mark]

A

Fixture is to guide the tool as well as to locate and clamp the work piece

B

Jig is to guide the tool as well as to locate and clamp the work piece

C

Jigs are used on CNC machines to locate and clamp the workpiece and guide the tool

D

No arrangement to guide the tool is provided in jig

MULTIPLE CHOICE QUESTION

Try yourself:  In EDM, the tool is made of

[1999]

A

Copper

B

HSS

C

Cast iron

D

Plain carbon steel

MULTIPLE CHOICE QUESTION

Try yourself:  Inter electrode gap in ECG is controlled by

[1997]

A

controlling the pressure of electrolyte flow

B

controlling the applied static load

C

controlling the size of diamond particle in the wheel

D

controlling the texture of the work

MULTIPLE CHOICE QUESTION

Try yourself: Selection of electrolyte for ECM is as follows

[1997]

A

non - passivating electrolyte for stock removal and passivating electrolyte for finish control

B

passivating electrolyte for stock removal and non-passivating electrolyte for finish control

C

selection of electrolyte is dependent on current density

D

electrolyte selection is based on tool work electrodes

MULTIPLE CHOICE QUESTION

Try yourself: In ultrasonic machining process, the material removal rate will be higher for material with

[1993]

A

higher toughness

B

higher ductility

C

lower toughness

D

higher fracture strain

MULTIPLE CORRECT QUESTION

Try yourself: The two main criteria for s electing the electrolyte in ECM is that the electrolyte should

[1992]

A

chemically stable

B

not allow dissolution of cathode material

C

not allow dissolution of anode material

D

have high electrical conductivity

MULTIPLE CHOICE QUESTION

Try yourself: In USM the metal removal rate would ... with increasing mean grain diameter of the abrasive material

[1992]

A

increase

B

decrease

C

increase and then decrease

D

decrease and then increase

MULTIPLE CHOICE QUESTION

Try yourself: In ECM, the material removal rate will be higher for metal with

[1989]

A

large density

B

larger valency

C

larger Chemical absorption tendency

D

large chemical weight

The document GATE Past Year Questions: Nonconventional Machining (ECM, EDM, ASM, USM) is a part of the Mechanical Engineering Course Manufacturing Engineering.
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FAQs on GATE Past Year Questions: Nonconventional Machining (ECM, EDM, ASM, USM)

1. What is nonconventional machining?
Ans. Nonconventional machining refers to the process of removing material from a workpiece using methods other than traditional cutting or grinding. It includes various techniques such as Electrochemical Machining (ECM), Electro-Discharge Machining (EDM), Abrasive Flow Machining (AFM), and Ultrasonic Machining (USM).
2. How does Electrochemical Machining (ECM) work?
Ans. Electrochemical Machining (ECM) is a nonconventional machining process that uses the principle of electrolysis to remove material from a workpiece. In ECM, a conductive tool is placed in close proximity to the workpiece and a voltage is applied between them. The electrolyte, usually an aqueous solution, acts as a medium for the ion transfer. The material is dissolved from the workpiece by the action of electrochemical reactions, resulting in the desired shape or profile.
3. What are the advantages of Electro-Discharge Machining (EDM)?
Ans. Electro-Discharge Machining (EDM) offers several advantages over conventional machining methods. Some of the key advantages include: - Ability to machine complex shapes and intricate details. - No direct contact between the tool and workpiece, minimizing the risk of tool wear. - Suitable for machining hard and heat-resistant materials. - Can be used to machine materials with high toughness or low thermal conductivity. - Can produce a fine surface finish without the need for secondary operations.
4. How does Ultrasonic Machining (USM) work?
Ans. Ultrasonic Machining (USM) is a nonconventional machining process that uses the principle of ultrasonic vibrations to remove material from a workpiece. In USM, a slurry of abrasive particles in a liquid medium is used. The tool, known as a horn or sonotrode, is connected to a power source that generates ultrasonic vibrations. These vibrations are transferred to the abrasive slurry, causing the abrasive particles to impact the workpiece and remove material through a combination of mechanical and erosive actions.
5. What are the applications of Abrasive Flow Machining (AFM)?
Ans. Abrasive Flow Machining (AFM) is commonly used for various applications, including: - Removing burrs or sharp edges from machined parts. - Polishing and deburring internal passages or complex shapes that are difficult to access with traditional methods. - Enhancing the surface finish of components. - Controlling the flow characteristics or surface roughness of fluid passages, such as in fuel injection nozzles or hydraulic valves. - Machining intricate features in molds or dies, such as cooling channels, without causing damage to the mold surface.
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