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301.

What are the machining rates used in Micro-EDM process?(a) 0.1 to 2 mm/min(b) 1 to 20 mm/min(c) 10 to 200 mm/min(d) 100 to 500 mm/minI got this question in a job interview.My doubt stems from EDM-Applications in division Thermal Processes of Advanced Machining

Answer» CORRECT OPTION is (b) 1 to 20 mm/min

For EXPLANATION I would say: Machining rates used in Micro-EDM PROCESS range from 1 to 20 mm/min.
302.

What is the full form of EDT in EDM processes?(a) Electro discharge Tinplating(b) Electro discharge Texturing(c) Electro discharge Tapping(d) Electro discharge TuringI got this question in an interview for internship.The origin of the question is EDM-Applications in division Thermal Processes of Advanced Machining

Answer»

The correct answer is (b) ELECTRO DISCHARGE Texturing

To explain I would SAY: Electro Discharge Texturing is a variant of EDM which is the FULL form of EDT.

303.

Which of the following shapes can be produced using Electro discharge machining?(a) Complex shapes(b) Simple shapes(c) All of the mentioned(d) None of the mentionedThis question was posed to me by my school teacher while I was bunking the class.My question is based upon EDM-Applications topic in section Thermal Processes of Advanced Machining

Answer»

The correct CHOICE is (c) All of the mentioned

The BEST EXPLANATION: Electro discharge machining is used to machine complex SHAPES to a HIGH degree of accuracy.

304.

Sparks occur between which of the following components?(a) Work piece and sheet metal(b) Tool electrode and sheet metal(c) Work piece and electrode(d) None of the mentionedThis question was posed to me in unit test.This interesting question is from EDM-Applications topic in section Thermal Processes of Advanced Machining

Answer» RIGHT answer is (b) TOOL ELECTRODE and sheet metal

Explanation: SPARKS occur between sheet metal and tool electrode for macining insulating ceramics.
305.

What happens to the surface roughness values if the MRR increases in EDM?(a) Increases(b) Decreases(c) Decrease and increase(d) None of the mentionedThe question was posed to me in an online interview.I would like to ask this question from EDM-Surface Integrity topic in section Thermal Processes of Advanced Machining

Answer»

Correct option is (a) Increases

The best I can explain: In EDM, the surface roughness values increases linearly with INCREASE in the material removal RATES.

306.

The altered layers formed during the process of EDM consists of which of the following?(a) Tempered layers(b) Heat affected zones(c) Intergranular precipitates(d) All of the mentionedThe question was posed to me by my college director while I was bunking the class.Asked question is from EDM-Heat Affected Zone (HAZ) topic in chapter Thermal Processes of Advanced Machining

Answer»

The CORRECT choice is (d) All of the mentioned

Best explanation: ALTERED layers consists of recast layers, tempered layers, HAZs and INTERGRANULAR PRECIPITATES in EDM.

307.

What are the values of material removal rates in EDM?(a) 0.001 to 0.1 mm^3/min(b) 0.1 to 400 mm^3/min(c) 400 to 1000 mm^3/min(d) 1000 to 5000 mm^3/minThe question was asked during an interview for a job.I need to ask this question from EDM-Material Removal Rate in portion Thermal Processes of Advanced Machining

Answer» CORRECT ANSWER is (b) 0.1 to 400 mm^3/min

For EXPLANATION: In EDM, material removal rates range from 0.10 to 400 mm^3/min.
308.

In EDM, electrode polarity depends up on which of the following components?(a) Work piece(b) Electrode material(c) All of the mentioned(d) None of the mentionedI got this question by my school principal while I was bunking the class.My question is based upon EDM-Machining System topic in division Thermal Processes of Advanced Machining

Answer» RIGHT ANSWER is (c) All of the mentioned

Easy explanation: In Electro discharge machining, ELECTRODE polarity depends on both work piece and electrode MATERIAL.
309.

State whether the following statement is true or false regarding EDM.(a) “In EDM, process is affected by hardness of material.”(b) True(c) FalseI got this question during an online exam.My query is from Electro Discharge Machining-Introduction topic in chapter Thermal Processes of Advanced Machining

Answer»

The CORRECT answer is (b) True

The best I can EXPLAIN: EDM process is not AFFECTED by the hardness of MATERIAL.