Unconventional Machine Process Set 21

Mechanical Engineering

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This set of Unconventional Machine Process (UMP) Multiple Choice Questions & Answers (MCQs) focuses on Unconventional Machine Process Set 21

Q1 | Electrolysis occur when which of the following takes place between electrodes?
  • electric current flow
  • electron flow
  • all of the mentioned
  • none of the mentioned
Answer: all of the mentioned
Explaination:
when there is an electron flow there is current flow in the opposite direction. for electrolysis to take place there should be flow of current between electrodes.
Q2 | The system which consists of electrolytic solution and electrodes can be referred to as
  • electrolytic cell
  • electrode system
  • electrolytic system
  • electrode cell
Answer: electrolytic cell
Explaination:
the system of electrodes and electrolytic solution is referred as electrolytic cell.
Q3 | The chemical reactions occurring at electrodes are called with, which of the following names?
  • anodic reactions
  • cathode reactions
  • all of the mentioned
  • none of the mentioned
Answer: all of the mentioned
Explaination:
chemical reactions occurring at electrodes are called as anodic or cathodic reactions.
Q4 | Amount of mass dissolved is directly proportional to which of the following quantities?
  • amount of electricity
  • frequency of vibrations
  • amplitude of oscillations
  • all of the mentioned
Answer: amount of electricity
Explaination:
amount of mass dissolved is directly proportional to amount of electricity and also substances’ chemical equivalent.
Q5 | Chemical equivalent is the ratio of which of the following factors?
  • work piece valence to the atomic weight
  • atomic weight to work piece valence
  • tool valence to molecular weight
  • molecular weight to tool valence
Answer: atomic weight to work piece valence
Explaination:
chemical equivalent is the ratio of atomic weight to work piece valence
Q6 | What are the values of voltages used in ECM?
  • 1 to 8 v
  • 10 to 30 v
  • 40 to 80 v
  • 90 to 110 v
Answer: 10 to 30 v
Explaination:
low voltages, ranging between 10 to 30 v are used in electrochemical machining.
Q7 | How does the current pass between the two electrodes in ECM?
  • electrolytic solution
  • direct contact of electrodes
  • all of the mentioned
  • none of the mentioned
Answer: electrolytic solution
Explaination:
current passes through the solution of electrolyte, which fills the gap between the electrodes.
Q8 | What is the value of velocity with which, electrolyte flows in the inter electrode gap?
  • >1 m/s
  • >3 m/s
  • >5 m/s
  • >10 m/s
Answer: >5 m/s
Explaination:
the velocity of the electrolytic solution must be greater than 5 m/s, in order to intensify the mass and charge transfer.
Q9 | Of the following, electrolyte removes which of the dissolution products?
  • metal hydroxides
  • heat
  • gas bubbles
  • all of the mentioned view answer
Answer: all of the mentioned view answer
Explaination:
electrolyte removes the dissolution products such as metal hydroxides, heat and gas bubbles formed in the inter electrode gap.
Q10 | State whether the following statement is true or false regarding the theory of ECM. “Application of P.D (potential difference) lead to occurrence of several reactions.”
  • true
  • false
Answer: true
Explaination:
when p.d (potential difference) is applied, different reactions occur at anode and cathode.
Q11 | Which of the following reactions takes place at the electrodes?
  • generation of hydrogen
  • dissolution of iron
  • dissolution of nacl
  • all of the mentioned
Answer: all of the mentioned
Explaination:
all the reactions mentioned above, take place at different electrodes in ecm.
Q12 | Which of the following reaction takes place at anode?
  • generation of hydrogen
  • dissolution of iron
  • generation of hydroxyl ions
  • none of the mentioned
Answer: dissolution of iron
Explaination:
at anode, dissolution of fe takes place in the process of ecm.
Q13 | Which of the following reactions take place at cathode?
  • generation of hydrogen
  • dissolution of iron
  • dissolution of nacl
  • all of the mentioned
Answer: generation of hydrogen
Explaination:
at cathode, generation of hydrogen takes place in the process of ecm.
Q14 | Positively charged particles (cations) move towards which electrode?
  • anode
  • cathode
  • anode & cathode
  • none of the mentioned
Answer: cathode
Explaination:
positively charge particles are directed towards the cathode, which is negatively charged.
Q15 | Negatively charged particles (anions) move towards which electrode?
  • anode
  • cathode
  • anode & cathode
  • none of the mentioned
Answer: anode
Explaination:
negatively charged particles are directed towards the anode, which is positively charged.
Q16 | Which of the following come under the main components of ECM?
  • feed control system
  • work piece holding devices
  • electrolyte supply system
  • all of the mentioned
Answer: all of the mentioned
Explaination:
the main components of electro chemical machining include feed control system, electrolyte supply system, power supply unit, work piece holding devices.
Q17 | Feed control system is responsible for which action in ECM?
  • giving feed to tool
  • electrolyte supply
  • power supply
  • none of the mentioned
Answer: giving feed to tool
Explaination:
feed control system is used for feeding the tool at constant rate during equilibrium machining.
Q18 | In ECM equipment, what is the role of electrolyte supply system?
  • giving feed to tool
  • electrolyte supply
  • power supply
  • none of the mentioned
Answer: electrolyte supply
Explaination:
as the name itself indicates, electrolyte supply system is used to supply the electrolyte required for anodic dissolution.
Q19 | What is the role of power supply unit in ECM equipment?
  • giving feed to tool
  • electrolyte supply
  • power supply
  • none of the mentioned
Answer: power supply
Explaination:
in ecm, power supply unit is used to supply the machine current at constant dc voltage.
Q20 | For large size machining, which type of facilities are used in ECM?
  • semi-automated facilities
  • automated facilities
  • automated & semi-automated facilities
  • none of the mentioned
Answer: automated & semi-automated facilities
Explaination:
automated and semi-automated facilities are used for large size machining.
Q21 | Electrolyte supply system should concentrate on which of the following factors?
  • pressure
  • supply rate
  • temperature
  • all of the mentioned
Answer: all of the mentioned
Explaination:
electrolyte supply system should supply electrolyte at a given rate, temperature and pressure.
Q22 | For high strength or rigidity, which type of coatings are recommended for metals?
  • other metal coatings
  • non-metallic coatings
  • all of the mentioned
  • none of the mentioned
Answer: non-metallic coatings
Explaination:
for high strength and rigidity, non-metallic coatings are recommended for metals.
Q23 | What is the value of voltage that the power supply unit supplies for ECM?
  • 0.01 to 1 v
  • 2 to 30 v
  • 50 to 80 v d) 100 to 160 v
Answer: 2 to 30 v
Explaination:
voltage supply required for ecm ranges between 2 to 30 v.
Q24 | What are the values of current densities used in ECM?
  • 0.1 to 2 a/cm2
  • 5 to 500 a/cm2
  • 600 to 1000 a/cm2
  • 1200 to 2800 a/cm2
Answer: 5 to 500 a/cm2
Explaination:
current density values in ecm range between 5 to 500 a/cm2.
Q25 | Which type of adjustment is to be done for gap voltages?
  • continuous adjustment
  • discontinuous adjustment
  • periodic adjustment
  • all of the mentioned
Answer: continuous adjustment
Explaination:
in ecm, usually continuous adjustment of gap voltage is required.
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