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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 24
Q1 | If there is a change in the selected machining conditions, it will have impact on which of the following?
- process accuracy
- surface finish
- process accuracy & surface finish
- none of the mentioned
Q2 | Surface roughness depends on current density, which is affected by which of the following?
- tool feed rate
- gap voltage
- work piece material
- all of the mentioned
Q3 | Machining conditions leading to high accuracy are associated with surface roughness and productivity.
- greater, greater
- smaller, greater
- greater, smaller
- smaller, smaller
Q4 | Non stationary behaviour of ECM is due to, which of the factors below?
- gas generation
- heating
- passivation
- all of the mentioned
Q5 | For large components, actual machining time constitutes to how much percentage of the total machining time?
- very low
- low
- medium
- high
Q6 | What happens to the product cycle time, if the machining performance is improved?
- increases
- decreases
- remains same
- none of the mentioned
Q7 | The cost of additional control hardware remain a fraction of total machining cost.
- small
- large
- equal
- none of the mentioned
Q8 | With an increase in unmanned machining hours, what happens to the efficiency of ECM?
- increases
- reduces
- decreases
- increase and then decrease
Q9 | Which type of damage is caused by deterioration which is caused by spark?
- reparable
- irreparable
- all of the mentioned
- none of the mentioned
Q10 | Which of the following use ECM for different applications?
- gas turbines
- jet engines
- bio medical implants
- all of the mentioned
Q11 | Which of the following processes can be done using ECM?
- die sinking
- profiling and contouring
- drilling and trepanning
- all of the mentioned
Q12 | Which of the following material cannot be machined using ECM?
- high strength alloys
- hardened steels
- nonconductive materials
- all of the mentioned
Q13 | ECM is used to the sharp edges produced after rough cuts.
- enhance
- dull
- improve
- none of the mentioned
Q14 | ECM is usually characterized as low accuracy machining, for which of the following reason?
- narrow gap width
- wider gap width
- high current densities
- all of the mentioned
Q15 | In micro ECM, which of the following is used as micro tool?
- electrolyte jet
- electrodes
- power supply
- all of the mentioned
Q16 | Micro ECM is used to machine which type of parts?
- large parts
- micro parts
- normal sized parts
- all of the mentioned
Q17 | Which of the following produces small indents and cavities using micro ECM?
- moving the work piece
- switching the pulse current
- moving the work piece & switching the pulse current
- none of the mentioned
Q18 | What fraction of tool will always be in contact with the work piece?
- half
- full
- no contact
- quarter
Q19 | How much amount of wear is present in the tool used in Electrochemical machining?
- no wear
- low
- medium
- high
Q20 | Compared to other processes, machining is done at voltages for high rates of material removal.
- low
- medium
- high
- very low
Q21 | Very small dimensions, up to which value can be controlled using ECM?
- 0.01 mm
- 0.05 mm
- 0.07 mm
- 0.12 mm
Q22 | Complicated profiles can be machined in how many operations in Electrochemical machining?
- single
- double
- triple
- multiple
Q23 | How much amount of thermal damage occurs to the work piece?
- small
- large
- no thermal damage
- negligible amount
Q24 | Which of the following materials can be machined using ECM?
- hard nonconductive materials
- hard conductive materials
- all nonconductive materials
- none of the mentioned
Q25 | What are the requirements of labour for machining purpose in Electrochemical machining?
- low
- medium
- high
- very high