McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 501. |
Electrolysis occur when which of the following takes place between electrodes? |
| A. | electric current flow |
| B. | electron flow |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» C. all of the mentioned | |
| Explanation: 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. | |
| 502. |
The system which consists of electrolytic solution and electrodes can be referred to as |
| A. | electrolytic cell |
| B. | electrode system |
| C. | electrolytic system |
| D. | electrode cell |
| Answer» A. electrolytic cell | |
| Explanation: the system of electrodes and electrolytic solution is referred as electrolytic cell. | |
| 503. |
The chemical reactions occurring at electrodes are called with, which of the following names? |
| A. | anodic reactions |
| B. | cathode reactions |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» C. all of the mentioned | |
| Explanation: chemical reactions occurring at electrodes are called as anodic or cathodic reactions. | |
| 504. |
Amount of mass dissolved is directly proportional to which of the following quantities? |
| A. | amount of electricity |
| B. | frequency of vibrations |
| C. | amplitude of oscillations |
| D. | all of the mentioned |
| Answer» A. amount of electricity | |
| Explanation: amount of mass dissolved is directly proportional to amount of electricity and also substances’ chemical equivalent. | |
| 505. |
Chemical equivalent is the ratio of which of the following factors? |
| A. | work piece valence to the atomic weight |
| B. | atomic weight to work piece valence |
| C. | tool valence to molecular weight |
| D. | molecular weight to tool valence |
| Answer» B. atomic weight to work piece valence | |
| Explanation: chemical equivalent is the ratio of atomic weight to work piece valence | |
| 506. |
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 v |
| Answer» B. 10 to 30 v | |
| Explanation: low voltages, ranging between 10 to 30 v are used in electrochemical machining. | |
| 507. |
How does the current pass between the two electrodes in ECM? |
| A. | electrolytic solution |
| B. | direct contact of electrodes |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» A. electrolytic solution | |
| Explanation: current passes through the solution of electrolyte, which fills the gap between the electrodes. | |
| 508. |
What is the value of velocity with which, electrolyte flows in the inter electrode gap? |
| A. | >1 m/s |
| B. | >3 m/s |
| C. | >5 m/s |
| D. | >10 m/s |
| Answer» C. >5 m/s | |
| Explanation: the velocity of the electrolytic solution must be greater than 5 m/s, in order to intensify the mass and charge transfer. | |
| 509. |
Of the following, electrolyte removes which of the dissolution products? |
| A. | metal hydroxides |
| B. | heat |
| C. | gas bubbles |
| D. | all of the mentioned view answer |
| Answer» D. all of the mentioned view answer | |
| Explanation: electrolyte removes the dissolution products such as metal hydroxides, heat and gas bubbles formed in the inter electrode gap. | |
| 510. |
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.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: when p.d (potential difference) is applied, different reactions occur at anode and cathode. | |
| 511. |
Which of the following reactions takes place at the electrodes? |
| A. | generation of hydrogen |
| B. | dissolution of iron |
| C. | dissolution of nacl |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the reactions mentioned above, take place at different electrodes in ecm. | |
| 512. |
Which of the following reaction takes place at anode? |
| A. | generation of hydrogen |
| B. | dissolution of iron |
| C. | generation of hydroxyl ions |
| D. | none of the mentioned |
| Answer» B. dissolution of iron | |
| Explanation: at anode, dissolution of fe takes place in the process of ecm. | |
| 513. |
Which of the following reactions take place at cathode? |
| A. | generation of hydrogen |
| B. | dissolution of iron |
| C. | dissolution of nacl |
| D. | all of the mentioned |
| Answer» A. generation of hydrogen | |
| Explanation: at cathode, generation of hydrogen takes place in the process of ecm. | |
| 514. |
Positively charged particles (cations) move towards which electrode? |
| A. | anode |
| B. | cathode |
| C. | anode & cathode |
| D. | none of the mentioned |
| Answer» B. cathode | |
| Explanation: positively charge particles are directed towards the cathode, which is negatively charged. | |
| 515. |
Negatively charged particles (anions) move towards which electrode? |
| A. | anode |
| B. | cathode |
| C. | anode & cathode |
| D. | none of the mentioned |
| Answer» A. anode | |
| Explanation: negatively charged particles are directed towards the anode, which is positively charged. | |
| 516. |
Which of the following come under the main components of ECM? |
| A. | feed control system |
| B. | work piece holding devices |
| C. | electrolyte supply system |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: the main components of electro chemical machining include feed control system, electrolyte supply system, power supply unit, work piece holding devices. | |
| 517. |
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 mentioned |
| Answer» A. giving feed to tool | |
| Explanation: feed control system is used for feeding the tool at constant rate during equilibrium machining. | |
| 518. |
In ECM equipment, what is the role of electrolyte supply system? |
| A. | giving feed to tool |
| B. | electrolyte supply |
| C. | power supply |
| D. | none of the mentioned |
| Answer» B. electrolyte supply | |
| Explanation: as the name itself indicates, electrolyte supply system is used to supply the electrolyte required for anodic dissolution. | |
| 519. |
What is the role of power supply unit in ECM equipment? |
| A. | giving feed to tool |
| B. | electrolyte supply |
| C. | power supply |
| D. | none of the mentioned |
| Answer» C. power supply | |
| Explanation: in ecm, power supply unit is used to supply the machine current at constant dc voltage. | |
| 520. |
For large size machining, which type of facilities are used in ECM? |
| A. | semi-automated facilities |
| B. | automated facilities |
| C. | automated & semi-automated facilities |
| D. | none of the mentioned |
| Answer» C. automated & semi-automated facilities | |
| Explanation: automated and semi-automated facilities are used for large size machining. | |
| 521. |
Electrolyte supply system should concentrate on which of the following factors? |
| A. | pressure |
| B. | supply rate |
| C. | temperature |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: electrolyte supply system should supply electrolyte at a given rate, temperature and pressure. | |
| 522. |
For high strength or rigidity, which type of coatings are recommended for metals? |
| A. | other metal coatings |
| B. | non-metallic coatings |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» B. non-metallic coatings | |
| Explanation: for high strength and rigidity, non-metallic coatings are recommended for metals. | |
| 523. |
What is the value of voltage that the power supply unit supplies for ECM? |
| A. | 0.01 to 1 v |
| B. | 2 to 30 v |
| C. | 50 to 80 v |
| D. | 100 to 160 v |
| Answer» B. 2 to 30 v | |
| Explanation: voltage supply required for ecm ranges between 2 to 30 v. | |
| 524. |
What are the values of current densities used in ECM? |
| A. | 0.1 to 2 a/cm2 |
| B. | 5 to 500 a/cm2 |
| C. | 600 to 1000 a/cm2 |
| D. | 1200 to 2800 a/cm2 |
| Answer» B. 5 to 500 a/cm2 | |
| Explanation: current density values in ecm range between 5 to 500 a/cm2. | |
| 525. |
Which type of adjustment is to be done for gap voltages? |
| A. | continuous adjustment |
| B. | discontinuous adjustment |
| C. | periodic adjustment |
| D. | all of the mentioned |
| Answer» A. continuous adjustment | |
| Explanation: in ecm, usually continuous adjustment of gap voltage is required. | |
| 526. |
Compared to the tool used in ECM, how should be the work piece size? |
| A. | greater than |
| B. | smaller than |
| C. | same as tool |
| D. | none of the mentioned |
| Answer» A. greater than | |
| Explanation: by an oversize, work piece size is expected to be greater than tool size. | |
| 527. |
Which of the following factors are used to determine the tool geometry? |
| A. | required shape |
| B. | electrical conductivity |
| C. | tool feed rate |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: for determining a tool geometry we must specify some factors such as the required shape of the surface, tool feed rate, gap voltage, electrochemical machinability of the work material, electrolyte conductivity, and both electrodes’ polarization voltages. | |
| 528. |
Which of the following are the simplest methods for applying the insulation on tools? |
| A. | spraying |
| B. | dipping |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» C. all of the mentioned | |
| Explanation: in ecm, dipping or spraying are the simplest methods for insulating the tools. | |
| 529. |
What are the main functions of electrolyte in Electrochemical machining? |
| A. | conduct machining current |
| B. | removal of debris |
| C. | maintaining constant temperature |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: main functions of electrolyte are conducting machine current, removing the debris, carrying away the heat, maintaining constant temperature. | |
| 530. |
Electrolytic solution should ensure which type of anodic dissolution? |
| A. | uniform |
| B. | non-uniform |
| C. | low speed |
| D. | none of the mentioned |
| Answer» A. uniform | |
| Explanation: uniform and high speed anodic dissolution must be ensured by the electrolyte. | |
| 531. |
State whether the following statement is true or false regarding the electrolytic solution. “In ECM, formation of passive film is recommended.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: electrolytic solution should avoid formation of passive layers on anode. | |
| 532. |
Which type of electrical conductivity is necessary for electrolytic solution? |
| A. | low |
| B. | medium |
| C. | high |
| D. | none of the mentioned |
| Answer» C. high | |
| Explanation: high electrical conductivity is needed for electrolytic solution in ecm. | |
| 533. |
What are the other features of electrolytic solution in ECM? |
| A. | non toxic |
| B. | less erosive |
| C. | less viscous |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: electrolytic solution should be nontoxic, less viscous and less erosive. | |
| 534. |
How much should be the electrolytic solution? |
| A. | highly expensive |
| B. | inexpensive |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» B. inexpensive | |
| Explanation: electrolyte must be inexpensive and available at ease. | |
| 535. |
Which are the most common electrolytes used in Electrochemical machining? |
| A. | sodium chloride |
| B. | sodium nitride |
| C. | sodium hydroxide |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: electrolytes such as sodium chloride, sodium nitride, sodium hydroxide are some of the electrolytes used in ecm. | |
| 536. |
Selection of electrolyte does not depend on which of the following factors? |
| A. | work piece material |
| B. | dimensional tolerance |
| C. | heat affected zones |
| D. | machining productivity |
| Answer» C. heat affected zones | |
| Explanation: selection of electrolyte depend up on work piece material, dimensional tolerance, machining productivity and surface finish required. | |
| 537. |
What must be the value of electrolytic temperature in ECM? |
| A. | 2 to 14oc |
| B. | 22 to 45oc |
| C. | 46 to 57oc |
| D. | 62 to 76oc |
| Answer» B. 22 to 45oc | |
| Explanation: temperature of electrolyte should range between 22 to 45oc. | |
| 538. |
What must be the value of the pressure of electrolytic solution used in ECM? |
| A. | 1 to 10 kpa |
| B. | 10 to 80 kpa |
| C. | 100 to 200 kpa |
| D. | 300 to 400 kpa |
| Answer» C. 100 to 200 kpa | |
| Explanation: value of pressure of electrolytic solution must range between 100 to 200 kpa. | |
| 539. |
What must be the value of velocity of the electrolytic solution? |
| A. | 10 to 15 m/s |
| B. | 25 to 50 m/s |
| C. | 60 to 100 m/s |
| D. | 120 to 200 m/s |
| Answer» B. 25 to 50 m/s | |
| Explanation: typical velocity of the electrolytic solution must range between 25 to 50 m/sec. | |
| 540. |
Local metal removal rates are high at which gap locations mentioned below? |
| A. | small gap |
| B. | medium gap |
| C. | large gap |
| D. | none of the mentioned |
| Answer» A. small gap | |
| Explanation: local metal removal rates are high at small gap locations in ecm. | |
| 541. |
When local metal removal rates are high, how will be the current density and current efficiency? |
| A. | high |
| B. | medium |
| C. | low |
| D. | very low |
| Answer» A. high | |
| Explanation: when the local metal removal rates are high then current density and efficiency are also high. | |
| 542. |
Current efficiency depends on which of the following in ECM? |
| A. | anodic material |
| B. | electrolyte |
| C. | anodic material & electrolyte |
| D. | none of the mentioned |
| Answer» C. anodic material & electrolyte | |
| Explanation: current efficiency in ecm depend on electrolyte and anodic material used. | |
| 543. |
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 mentioned |
| Answer» 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. | |
| 544. |
Apparent current efficiency is due to which of the following factors? |
| A. | choice of wrong valence |
| B. | passivation of anodic surface |
| C. | gas evolution at anode |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: current efficiency may be apparent because of choice of wrong valence, passivation of anodic surface or gas evolution at anodic surface. | |
| 545. |
State whether the following statement is true or false regarding the working principles. “In ECM, grain boundary attacks remove the grains through electrolytic forces.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: in ecm, grain boundary attacks are the cause for removal of grains by electrolytic forces. | |
| 546. |
In ECM, gap increase proportional to which relation of time below? |
| A. | square of time |
| B. | square root of time |
| C. | cube of time |
| D. | cube root of time |
| Answer» B. square root of time | |
| Explanation: in electrochemical machining, gap increases proportional to the square root of time. | |
| 547. |
At constant feed rates what happens to gap thickness? |
| A. | increases |
| B. | decreases |
| C. | becomes constant |
| D. | none of the mentioned |
| Answer» C. becomes constant | |
| Explanation: at constant feed rate, work piece becomes stationary and thus the gap thickness becomes constant. | |
| 548. |
At constant gap thickness material removal becomes equal to feed rate. What is this gap called? |
| A. | equal gap |
| B. | equilibrium gap |
| C. | unique gap |
| D. | narrow gap |
| Answer» B. equilibrium gap | |
| Explanation: when rate of material removal per unit area is same as feed rate, then corresponding thickness is called as equilibrium thickness indicated by ‘ye’. | |
| 549. |
If the gap thickness is greater than equilibrium thickness what will be MRR? |
| A. | mrr is less than feed rate |
| B. | mrr is greater than feed rate |
| C. | mrr is equal to feed rate |
| D. | none of the mentioned |
| Answer» A. mrr is less than feed rate | |
| Explanation: when gap thickness is greater than equilibrium thickness, mrr will be less than feed rate. | |
| 550. |
During ECM drilling, decrease in feed rates lead to which type of machining gaps? |
| A. | wider |
| B. | narrow |
| C. | small |
| D. | none of the mentioned |
| Answer» A. wider | |
| Explanation: decrease in feed rate lead to wider gap thickness in ecm drilling. | |
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