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201.

How much amount of energy is consumed in Electro chemical machining?(a) Very small(b) Small(c) Medium(d) LargeThis question was addressed to me in an interview for internship.My question comes from ECM-Advantages and Disadvantages topic in portion Electrochemical Processes of Advanced Machining

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Correct answer is (d) Large

For explanation I WOULD SAY: Very huge AMOUNT of energy is REQUIRED for ECM, which is nearly 100 times required for TURNING or drilling of steel.

202.

ECM is used to _________ the sharp edges produced after rough cuts.(a) Enhance(b) Dull(c) Improve(d) None of the mentionedI had been asked this question during a job interview.The doubt is from ECM-Applications and Micro-ECM in section Electrochemical Processes of Advanced Machining

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The CORRECT answer is (b) Dull

The best explanation: Using deburring process through ECM, SHARP edges are dulled, which are PRODUCED after ROUGH cuts.

203.

For large components, actual machining time constitutes to how much percentage of the total machining time?(a) Very low(b) Low(c) Medium(d) HighI got this question during an online interview.This interesting question is from ECM-Process Control topic in chapter Electrochemical Processes of Advanced Machining

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The correct choice is (d) HIGH

The EXPLANATION: Actual machining TIME of LARGE components CONSTITUTES to a high percentage of total machining time.

204.

In the following ratios of metal dissolved amounts, which one represent the current efficiency?(a) Observed to theoretical(b) Theoretical to observed(c) All of the mentioned(d) None of the mentionedI had been asked this question in homework.This key question is from ECM-Basic Working Principles topic in chapter Electrochemical Processes of Advanced Machining

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The correct choice is (a) OBSERVED to theoretical

Explanation: In electrochemical machining, CURRENT efficiency is the ratio of observed AMOUNT of metal DISSOLVED to the theoretical amount of metal dissolved.

205.

If the current density is high as required, what type of machining occurs?(a) Pitting(b) Polishing(c) Etching(d) All of the mentionedThis question was addressed to me in an online quiz.This question is from ECM-Process Characteristics in chapter Electrochemical Processes of Advanced Machining

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The CORRECT option is (B) POLISHING

Explanation: When the current DENSITY is RELATIVELY high as required, then polishing occurs.

206.

Too small gap causes which of the following effects?(a) Sparking(b) Short circuit(c) Sparking & Short circuit(d) None of the mentionedI had been asked this question during a job interview.My enquiry is from ECM-Basic Working Principles in division Electrochemical Processes of Advanced Machining

Answer» RIGHT choice is (c) Sparking & SHORT circuit

For explanation I WOULD say: Sparking or short circuit occurs when the gap is too small.
207.

Current efficiency depends on which of the following in ECM?(a) Anodic material(b) Electrolyte(c) Anodic material & Electrolyte(d) None of the mentionedThe question was asked during an interview.I need to ask this question from ECM topic in chapter Electrochemical Processes of Advanced Machining

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The correct ANSWER is (C) ANODIC MATERIAL & Electrolyte

The explanation is: Current efficiency in ECM depend on electrolyte and anodic material used.

208.

During ECM drilling, decrease in feed rates lead to which type of machining gaps?(a) Wider(b) Narrow(c) Small(d) None of the mentionedThis question was addressed to me at a job interview.This question is from ECM-Basic Working Principles topic in section Electrochemical Processes of Advanced Machining

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Correct answer is (a) Wider

The best I can EXPLAIN: DECREASE in FEED rate lead to wider gap THICKNESS in ECM drilling.

209.

Feed control system is responsible for which action in ECM?(a) Giving feed to tool(b) Electrolyte supply(c) Power supply(d) None of the mentionedThis question was posed to me by my school principal while I was bunking the class.My question is taken from ECM topic in section Electrochemical Processes of Advanced Machining

Answer» CORRECT ANSWER is (a) Giving feed to tool

To explain: Feed CONTROL system is used for feeding the tool at constant RATE during equilibrium MACHINING.
210.

What are the values of voltages used in ECM?(a) 1 to 8 V(b) 10 to 30 V(c) 40 to 80 V(d) 90 to 110 VThe question was asked during an interview.My question is taken from ECM-Theory of ECM topic in portion Electrochemical Processes of Advanced Machining

Answer» RIGHT option is (b) 10 to 30 V

For explanation: Low voltages, ranging between 10 to 30 V are used in ELECTROCHEMICAL machining.