McqMate
| 401. |
What are the disadvantages of PBM? |
| A. | large power supplies |
| B. | heat produced |
| C. | toxic fumes produced |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: large power for more thick materials, production of heat and toxic fumes are some of the main disadvantages of pbm | |
| 402. |
What is the full form of EBM in the advanced machining processes? |
| A. | electro blast manufacturing |
| B. | electron beam machining |
| C. | electron beam manufacturing |
| D. | electron blast manufacturing |
| Answer» B. electron beam machining | |
| Explanation: the full form of ebm is electron beam machining in the advanced machining processes. | |
| 403. |
Which of the following are the applications of EBM process? |
| A. | drilling |
| B. | cutting |
| C. | engraving |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: drilling small holes, cutting, engraving, and heat treatment are some of modern applications of electron beam machining. | |
| 404. |
What are the values of currents used in EBM process? |
| A. | 1 and 20 ma |
| B. | 20 and 100 ma |
| C. | 100 and 200 ma |
| D. | 200 and 400 ma |
| Answer» B. 20 and 100 ma | |
| Explanation: the values of the currents used in the electron beam machining process are between 20 and 100 ma. | |
| 405. |
What are the values of current densities used in the process of EBM? |
| A. | 5 and 15 a/cm2 |
| B. | 15 and 20 a/cm2 |
| C. | 20 and 30 a/cm2 |
| D. | 40 and 60 a/cm2 |
| Answer» A. 5 and 15 a/cm2 | |
| Explanation: the values of the current densities used in ebm lie between 5 and 15 a/cm2. | |
| 406. |
Emission current depends up on which of the following factors? |
| A. | cathode material |
| B. | temperature |
| C. | voltage supply |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: emission current depends on the cathode material, temperature, and the high voltage in the process of electron beam machining. | |
| 407. |
What are the values of voltages used in the EBM process? |
| A. | 10 v |
| B. | 50 v |
| C. | 150 v |
| D. | 200 v |
| Answer» C. 150 v | |
| Explanation: the values of voltages used in the process of electron beam machining is about 150 v. | |
| 408. |
Which of the following lenses are used for refocussing the electrons in EBM process? |
| A. | magnetic lens |
| B. | electronic lens |
| C. | magnetic & electronic lens |
| D. | none of the mentioned |
| Answer» C. magnetic & electronic lens | |
| Explanation: magnetic and electronic lenses are used to refocus the electrons in ebm process. | |
| 409. |
What are the values of power densities used in the EBM process? |
| A. | 0.05 mw/mm2 |
| B. | 0.55 mw/mm2 |
| C. | 1.55 mw/mm2 |
| D. | 2.55 mw/mm2 |
| Answer» C. 1.55 mw/mm2 | |
| Explanation: the value of the power densities used in the process of electron beam machining are about 1.55 mw/mm2. | |
| 410. |
What is the frequency of the pulse of electrons used in EBM process? |
| A. | 10 hz |
| B. | 102 hz |
| C. | 103 hz |
| D. | 104 hz |
| Answer» D. 104 hz | |
| Explanation: a pulsed electron beam at 104 hz reduces the temperature of the work piece outside the region being machined. | |
| 411. |
What are the values of material removal rates in EBM process? |
| A. | 1 mm3/min |
| B. | 10 mm3/min |
| C. | 100 mm3/min |
| D. | 1000 mm3/min |
| Answer» B. 10 mm3/min | |
| Explanation: the values of the material removal rates in the process of electron beam machining are about 10 mm3/min. | |
| 412. |
What are the values of the cavity diameters that are obtained in EBM? |
| A. | 15 to 20 µm |
| B. | 20 to 25 µm |
| C. | 30 to 35 µm |
| D. | 35 to 40 µm |
| Answer» D. 35 to 40 µm | |
| Explanation: the values of the cavity diameters range from 35 to 40 µm | |
| 413. |
Which of the following are the applications of EBM? |
| A. | hole drilling |
| B. | slotting |
| C. | perforation of thin sheets |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: drilling, perforation of thin sheets, slotting and integrated circuit fabrication are some of the applications of electron beam machining. | |
| 414. |
What is the value of largest diameter of the hole drilled on EBM? |
| A. | 0.5 mm |
| B. | 1.0 mm |
| C. | 1.5 mm |
| D. | 2.0 mm |
| Answer» C. 1.5 mm | |
| Explanation: the maximum value of diameter that can be drilled using electron beam machining is about 1.5 mm. | |
| 415. |
What is the value of maximum depth of the hole drilled on EBM? |
| A. | 10 mm |
| B. | 20 mm |
| C. | 30 mm |
| D. | 40 mm |
| Answer» C. 30 mm | |
| Explanation: value of the maximum depth that can be drilled using electron beam machining is about 10 mm. | |
| 416. |
What is the value of energy required for bond breaking? |
| A. | 10 to 20kv |
| B. | 20 to 30kv |
| C. | 30 to 40kv |
| D. | 40 to 50kv |
| Answer» A. 10 to 20kv | |
| Explanation: value of the beam energy used for breaking bonds or cross linking them range from 10 to 20kv. | |
| 417. |
1 and 16000 Hz in Electron beam machining. |
| A. | ± 10 % |
| B. | ± 20 % |
| C. | ± 30 % |
| D. | ± 40 % |
| Answer» A. ± 10 % | |
| Explanation: the tolerances obtained in electron beam machining is about ± 10 % of the depth of cut. | |
| 418. |
Which of the following are the advantages of EBM process? |
| A. | drilling rates |
| B. | no distortion |
| C. | high accuracy |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: the main advantages of electron beam machining are high drilling rates, no mechanical distortion, high accuracy and repeatability. | |
| 419. |
There is no limitation imposed on which of the following factors in EBM? |
| A. | material ductility |
| B. | surface hardness |
| C. | surface reflectivity |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: in electron beam machining, no limitation is imposed by work piece hardness, ductility, and surface reflectivity. | |
| 420. |
How much is the capital equipment cost of equipment used in EBM? |
| A. | very low cost |
| B. | low cost |
| C. | moderate cost |
| D. | high cost |
| Answer» D. high cost | |
| Explanation: the capital equipment cost of the electron beam machining is high compared to other machining processes. | |
| 421. |
How are the production times for a material in electron beam machining? |
| A. | very small |
| B. | small |
| C. | moderate |
| D. | long |
| Answer» D. long | |
| Explanation: in electron beam machining, long production times are required due to the generation of vacuum in the chamber for machining purpose. | |
| 422. |
Which type of thin cast layer is produced when we use EBM? |
| A. | thin layer |
| B. | thick layer |
| C. | no layer |
| D. | all of the mentioned |
| Answer» A. thin layer | |
| Explanation: thin recast layer is produced in electron beam machining which an added disadvantage to the machining process | |
| 423. |
In advanced machining processes, what is the full form of CHM? |
| A. | chemical machining |
| B. | chemical manufacturing |
| C. | chemical milling |
| D. | none of the mentioned |
| Answer» C. chemical milling | |
| Explanation: in advanced machining processes, full form of chm is chemical milling. | |
| 424. |
Of the following, which mechanism is used for the removal of material using Chemical milling process? |
| A. | material vaporization |
| B. | chemical dissolution |
| C. | mechanical erosion |
| D. | mechanical abrasion |
| Answer» B. chemical dissolution | |
| Explanation: chemical dissolution takes place in chemical milling for the removing the material. | |
| 425. |
Which of the following solutions cannot be used as chemical reactive solution in CHM? |
| A. | acidic solution |
| B. | alkaline solution |
| C. | neutral solution |
| D. | none of the mentioned |
| Answer» C. neutral solution | |
| Explanation: both acidic or alkane solutions are used for chemical dissolution in chemical milling. | |
| 426. |
By using Chemical machining, which of the following can be produced? |
| A. | pockets |
| B. | contours |
| C. | slots |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: by the use of chm, pockets, contours, slots and materials having high strength to weight ratio can be machined. | |
| 427. |
Pre cleaning is done on the work piece surface in order to achieve, which of the following factors? |
| A. | to provide good adhesion |
| B. | to provide clean surface |
| C. | to assure the absence of contaminants |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, are achieved thorough pre-cleaning process. | |
| 428. |
Special coatings applied on work piece materials in order to protect them from chemical reaction are known as |
| A. | maskants |
| B. | protective coverings |
| C. | protective varnishing |
| D. | none of the mentioned |
| Answer» A. maskants | |
| Explanation: the protective coatings on work pieces are known as maskants. | |
| 429. |
Type of mask depends on which of the factor/s, given below? |
| A. | size of work piece |
| B. | number of parts |
| C. | desired resolution |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, are required to select the type of mask. | |
| 430. |
During Chemical milling, depth of etch is controlled by which factor of immersion? |
| A. | time |
| B. | mask method |
| C. | mask area |
| D. | none of the mentioned |
| Answer» A. time | |
| Explanation: as the immersion time increases, depth of the etching increases. | |
| 431. |
What is the range of reagent temperatures used for chemical dissolution in CHM? |
| A. | 12ᵒc to 35ᵒc |
| B. | 37ᵒc to 85ᵒc |
| C. | 90ᵒc to 101ᵒc |
| D. | 121ᵒc to 142ᵒc |
| Answer» B. 37ᵒc to 85ᵒc | |
| Explanation: the optimum temperature of reagent used should range between 37ᵒc to 85ᵒc. | |
| 432. |
In Chemical milling, excessive flow of chemical reagent results in which of the following defects? |
| A. | channellings |
| B. | grooves |
| C. | ridges |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: in chemical milling, if the reagent flows excessively, then the defects mentioned above may occur. | |
| 433. |
State whether the following statement about Chemical milling is true or false. “At higher temperatures, faster etching rates occur in Chemical milling.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: as the temperature increases, reaction rate increases which in turn increases etching rate in chm. | |
| 434. |
Of the following, which ratio defines the etch factor? |
| A. | etching depth to undercut |
| B. | undercut to etching depth |
| C. | undercut to mask area |
| D. | mask area to undercut |
| Answer» B. undercut to etching depth | |
| Explanation: etch factor is defined as the ratio of undercut to etching depth. | |
| 435. |
CHM cannot eliminate which of the following defects? |
| A. | irregularities and dents |
| B. | surface scratches |
| C. | waviness |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: chm is not a finishing process as that of maf, there are some sort of defects in chemical milling | |
| 436. |
Which of the following are the tools required for Chemical milling? |
| A. | maskants |
| B. | etchants |
| C. | scribing plates |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the components mentioned above, are required to carry out chemical milling process. | |
| 437. |
State which of the following statement is true or false regarding Chemical milling. “Maskants are generally used in CHM, to protect the work piece from the etching chemical agent.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: in chm, maskants are used to protect the work piece from chemical agents. | |
| 438. |
Which of the following are the materials used for making maskants? |
| A. | synthetic materials |
| B. | rubber materials |
| C. | polymeric materials |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the materials mentioned above, can be used for making maskants. | |
| 439. |
What are the properties that a maskant used in Chemical milling should possess? |
| A. | be tough and adhere well |
| B. | scribe easily |
| C. | be inert to chemical reagent |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the properties mentioned above, should be possessed by the maskants. | |
| 440. |
Which of the following can be used to apply the maskants on work piece in Chemical milling? |
| A. | dipping or spraying |
| B. | rolling or electro coating |
| C. | adhesive tapes |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: maskants can be applied to work piece, by the above mentioned means. | |
| 441. |
State whether the following statement is true or false regarding maskants. “After etching, maskants should be removed easily and inexpensively.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: after etching is done, maskants should be removed easily by inexpensive means. | |
| 442. |
In maskant application, photo-resist masks ensure which of the following advantages? |
| A. | high accuracy |
| B. | ease of repetition |
| C. | ease of modification |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: we will have the advantages which are mentioned above, if we use photo resist masking. | |
| 443. |
Which of the following, are the main uses of etchants applied in Chemical milling? |
| A. | good surface finish |
| B. | uniform material removal |
| C. | control intergranular attack |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: in chm, etchants are used for the above mentioned factors. | |
| 444. |
State whether the following statement is true or false about etchants. “Etchants are used for controlling H2 absorption in case of Ti alloys.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: etchants control the h2 absorption in ti alloys. | |
| 445. |
Scribing plates are used to define, which of the following parameters in Chemical milling? |
| A. | areas to be exposed |
| B. | volumes to be exposed |
| C. | areas not to be exposed |
| D. | volumes not to be exposed |
| Answer» A. areas to be exposed | |
| Explanation: scribing plates defines the areas that are to be exposed for removal of material. | |
| 446. |
Which of the following are can be used as guides for scribing process in Chemical milling? |
| A. | layout lines |
| B. | simple templates |
| C. | fibre glass |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the guides mentioned above, can be used for scribing process. | |
| 447. |
Which of the following are the accessories, included in the tooling of Chemical milling? |
| A. | tanks and hooks |
| B. | brackets and racks |
| C. | fixtures |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: the accessories mentioned above are included in the tooling of chemical milling. | |
| 448. |
Which of the following come under process parameters of Chemical milling? |
| A. | reagent type |
| B. | concentration |
| C. | operating temperature |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the parameters mentioned above, are different process parameters required for chemical milling. | |
| 449. |
State whether the following statement is true or false about Chemical milling. “Maskants, applied on work pieces, are not responsible for CHM process.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: maskants are also responsible for process to take place in chemical milling. | |
| 450. |
To machine high quality parts using CHM, which of the following need not be necessary? |
| A. | heat treatment of work piece |
| B. | grain size of work piece |
| C. | frequency of vibrations |
| D. | range of work pieces |
| Answer» C. frequency of vibrations | |
| Explanation: to machine high qualities products vibrational frequency is not necessary in chm. | |
| 451. |
The process parameters will have direct impact on which of the following factors? |
| A. | etch factor |
| B. | machining rate |
| C. | production tolerance |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, will have direct impact due to above process parameters. | |
| 452. |
Which of the following, are the general materials used for maskant application? |
| A. | neoprene |
| B. | poly vinyl chloride |
| C. | polyethylene |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the materials mentioned above, can be used as maskant materials. | |
| 453. |
On which of the following factors, MRR will not be depend on? |
| A. | chemical uniformity |
| B. | metallurgical uniformity |
| C. | frequency uniformity |
| D. | temperature uniformity |
| Answer» C. frequency uniformity | |
| Explanation: chemical milling is independent of frequency distribution. | |
| 454. |
Castings having a larger grain size, will show how much surface roughness value? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» D. high | |
| Explanation: in castings, as grain size increases, surface roughness increases. | |
| 455. |
Which of the following materials have the highest machining rate and best surface quality? |
| A. | rolled metal sheets |
| B. | thick metal plates |
| C. | polymeric plates |
| D. | plastic sheets |
| Answer» A. rolled metal sheets | |
| Explanation: rolled metal sheets will have highest machining rate and surface quality in chm. | |
| 456. |
For softer materials, which type of etching rates are obtained? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» B. low | |
| Explanation: in chemical milling, softer materials need low etching rates. | |
| 457. |
For harder materials, which of the following etching rates are obtained? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» D. high | |
| Explanation: in chemical milling, harder materials need higher etching rates. | |
| 458. |
State whether the following statement is true or false about etching rates. “As the etching rate increases, low surface roughness values occur.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: high etching rates result in low surface roughness values | |
| 459. |
Which of the following are necessary for best surface quality in Chemical milling? |
| A. | fine grain size and homogenous metallurgy |
| B. | coarse grain size and heterogeneous metallurgy |
| C. | fine grain size and heterogeneous metallurgy |
| D. | coarse grain size and homogenous metallurgy |
| Answer» A. fine grain size and homogenous metallurgy | |
| Explanation: in chm, for best surface quality, fine grain size and homogenous metallurgical work piece must be required. | |
| 460. |
Which of the following are the factors, on which, surface finish depends? |
| A. | grain size |
| B. | heat treatment |
| C. | induced stresses |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, are responsible for different qualities of surface finish. | |
| 461. |
State whether the following statement is true or false regarding surface finish in CHM. “The surfaces, which are machined using Chemical milling, will have regular lay pattern.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: in chm, surfaces do not have regular lay pattern. | |
| 462. |
Which of the following defects cannot be altered or eliminated using CHM? |
| A. | waviness |
| B. | surface imperfections |
| C. | scratches |
| D. | dents |
| Answer» B. surface imperfections | |
| Explanation: using chm, surface imperfections cannot be eliminated. | |
| 463. |
Which type of etching rate, mentioned below, produces low surface roughness? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» D. high | |
| Explanation: in chemical milling, high etching rate produces low surface roughness values and tolerances. | |
| 464. |
The depth of cut tolerances increases when machining depths at high machining rates. |
| A. | very smaller |
| B. | smaller |
| C. | medium |
| D. | larger |
| Answer» D. larger | |
| Explanation: in chemical milling, tolerance increases when machining depth increases. | |
| 465. |
What is the value of etching rate, which can be achieved using Chemical milling? |
| A. | 0.001 mm/min |
| B. | 0.025 mm/min |
| C. | 0.050 mm/min |
| D. | 0.075 mm/min |
| Answer» C. 0.050 mm/min | |
| Explanation: while we use chemical milling etch rates of around 0.025 mm/min are achieved. | |
| 466. |
What are the tolerance values achieved in Chemical milling, which depend on work piece material and depth of cut? |
| A. | ± 10% |
| B. | ± 20% |
| C. | ± 30% |
| D. | ± 40% |
| Answer» A. ± 10% | |
| Explanation: tolerances of ± 10% of cut width are achieved using chm. | |
| 467. |
For what value of machining depths, surface roughness sharply increases with depth of cut? |
| A. | <100 µm |
| B. | <200 µm |
| C. | <300 µm |
| D. | <400 µm |
| Answer» B. <200 µm | |
| Explanation: for material depths <200 µm, surface roughness increases with depth of cut. | |
| 468. |
What is the value of surface roughness, which is generally obtained using Chemical milling? |
| A. | 0.01 – 0.08 µm |
| B. | 0.1 – 0.8 µm |
| C. | 1 – 8 µm |
| D. | 10 – 80 µm |
| Answer» B. 0.1 – 0.8 µm | |
| Explanation: surface roughness obtained when general conditions are applied, is between 0.1 – 0.8 µm. | |
| 469. |
Which of the following can be easily removed using Chemical milling process? |
| A. | tio2 layer |
| B. | decarburized layer |
| C. | recast structure |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the layers mentioned above, can be removed using chemical milling. | |
| 470. |
What are the advantages when we use Chemical milling process? |
| A. | weight reduction |
| B. | no burrs |
| C. | no stresses |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the advantages mentioned above, can be obtained using chemical milling process. | |
| 471. |
Weight reduction is possible, on which type of contours? |
| A. | very simple |
| B. | simple |
| C. | complex |
| D. | none of the mentioned |
| Answer» C. complex | |
| Explanation: weight reduction can be possible using chemical milling, on complex contours, compared to conventional machining. | |
| 472. |
Simultaneous material removal using Chemical milling, results in which of the following? |
| A. | improves productivity |
| B. | reduces wrapping |
| C. | minimizing part distortion |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factor mentioned above occur, when we use chemical milling for material removal. | |
| 473. |
State whether the following statement is true or false regarding the advantages of CHM. “As there are no stresses induced, machining of delicate parts is possible.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: in chm, no stresses are induced, which makes machining of delicate parts easier. | |
| 474. |
Which type of taper can be achieved, using Chemical milling, on contours? |
| A. | discontinuous |
| B. | continuous |
| C. | periodic |
| D. | none of the mentioned |
| Answer» B. continuous | |
| Explanation: using chemical milling, a continuous taper, on contours can be achieved. | |
| 475. |
State whether the following statement is true or false regarding the advantages? “Capital cost of equipment, for machining large components, is relatively high.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: capital cost of equipment, is relatively low for machining large components. | |
| 476. |
Which of the following, are the other advantages of CHM? |
| A. | design changes |
| B. | less skilled operator |
| C. | minor tooling costs |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all of the advantages mentioned above, are obtained using chm. | |
| 477. |
Good surface quality and absence of burr eliminates which of the following? |
| A. | cutting operations |
| B. | finishing operations |
| C. | drilling operations |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| Explanation: absence of burrs and good surface quality eliminates finishing operations in chm. | |
| 478. |
State whether the following statement is true or false about advantages. “Extensive web areas and decorative finishes are not possible using CHM.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: decorative finishes are obtained when we use chm. | |
| 479. |
What are the values of scrap rates obtained in Chemical milling? |
| A. | 1% |
| B. | 3% |
| C. | 5% |
| D. | 7% |
| Answer» B. 3% | |
| Explanation: low scrapes rates around 3% are obtained when we use the chemical milling process | |
| 480. |
Which of the following are the limitations of Chemical milling process? |
| A. | disposal of chemicals |
| B. | limited scribing accuracy |
| C. | surface imperfections |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, are the limitations of chemical milling process. | |
| 481. |
What is the value of shallow cuts obtained on sheets and plates, when we use CHM? |
| A. | 3.83 mm |
| B. | 6.39 mm |
| C. | 12.27 mm |
| D. | 20.32 mm |
| Answer» C. 12.27 mm | |
| Explanation: very shallow depths of value 12.27 mm, are obtained when we use chm. | |
| 482. |
Hand masking, scribing and stripping can be difficult, due to which of the following factors? |
| A. | time consuming |
| B. | repetitive |
| C. | tedious |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the factors mentioned above, are main disadvantages for different processes in chm. | |
| 483. |
Which type of metallurgical surfaces are needed in Chemical milling process? |
| A. | homogenous |
| B. | heterogeneous |
| C. | mixture |
| D. | none of the mentioned |
| Answer» A. homogenous | |
| Explanation: metallurgic homogenous surfaces are needed for chemical milling to take place. | |
| 484. |
Porous castings yield, which type of surfaces in Chemical milling process? |
| A. | uniform surfaces |
| B. | even surfaces |
| C. | uneven surfaces |
| D. | none of the mentioned |
| Answer» C. uneven surfaces | |
| Explanation: as there are porous castings, there would be pores on the surface which lead to uneven surfaces. | |
| 485. |
State whether the following statement regarding the limitations of CHM. “Welded areas etch, at a rate that is same as base metal.” |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: welded areas etch at a different rate, when compared to that of base material. | |
| 486. |
Which of the following, indicate the accuracy of scribing by Chemical milling process? |
| A. | unlimited |
| B. | boundless |
| C. | infinite |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| Explanation: scribing accuracy is limited in chm process due to uneven surface finish. | |
| 487. |
Which of the following are the other limitations of Chemical milling process? |
| A. | hydrogen pickup |
| B. | intergranular attack |
| C. | complex designs becoming expensive |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: hydrogen pick up, intergranular attack are some other limitations in chemical milling process. | |
| 488. |
Which of the following is not a limitation of Chemical milling process? |
| A. | steep tapers not practical |
| B. | low scrap rates |
| C. | less scribing accuracy |
| D. | deep narrow cuts |
| Answer» B. low scrap rates | |
| Explanation: low scrap rates are possible in chemical milling, which is an advantage to the process | |
| 489. |
Which of the following metals can be machined using the Chemical milling process? |
| A. | copper |
| B. | zinc |
| C. | steel |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: zinc, copper, lead, and nickel are some of the metals that can be chemically machined. | |
| 490. |
Which of the following non-metallic materials can be machined using the Chemical milling process? |
| A. | plastics |
| B. | glass |
| C. | ceramics |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: non-metallic materials such as glass, ceramics and plastics can also be machined using chemical milling process. | |
| 491. |
Which of the following is the most popular application for weight reduction of aerospace components? |
| A. | shallow cuts |
| B. | deep cuts |
| C. | very deep cuts |
| D. | none of the mentioned |
| Answer» A. shallow cuts | |
| Explanation: shallow cuts in large thin sheets helps in reducing the weight, especially in aerospace industries. | |
| 492. |
How many designs can be machined from the same sheet in Chemical milling? |
| A. | only one |
| B. | two |
| C. | three |
| D. | multiple |
| Answer» D. multiple | |
| Explanation: in chemical milling, multiple designs can b machined on a large thin sheet depending upon the size of the designs. | |
| 493. |
CHM is used to thin out walls, web and ribs of parts that have been produces by which of the following processes? |
| A. | forging |
| B. | casting |
| C. | sheet metal forming |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: chm is used for applications mentioned above of the parts, which are formed by casting, forging and sheet metal forming processes. | |
| 494. |
Removal of sharp burrs come under which application of Chemical milling process? |
| A. | deep cuts |
| B. | multiple part machining |
| C. | improving surface characteristics |
| D. | none of the mentioned |
| Answer» C. improving surface characteristics | |
| Explanation: removal of sharp burrs improve the surface characteristics of parts machined using chemical milling. | |
| 495. |
Which of the following can be eliminated from the surfaces using Chemical milling? |
| A. | alpha case from ti-forgings |
| B. | decarburized layer from low cast alloys |
| C. | recast layer from machined parts |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: the defects on surfaces mentioned above, can be eliminated using chemical milling process. | |
| 496. |
CHM is used to remove the thin surfaces from forgings and castings, at which time of process? |
| A. | after penetration inspection |
| B. | prior to penetration inspection |
| C. | at the starting of process |
| D. | at the end of process |
| Answer» B. prior to penetration inspection | |
| Explanation: removal of thin surfaces from forgings and casting takes place, prior to penetration depth inspection. | |
| 497. |
State whether the following statement is true or false regarding the applications of CHM. “Removal of thin surfaces, prior to inspection, is done for detection of hidden defects.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: removal of thin surfaces is done to detect the hidden defects in surfaces using chm | |
| 498. |
In advanced machining processes, what is the full form of ECM? |
| A. | electrochemical manufacturing |
| B. | electrochemical milling |
| C. | electrochemical machining |
| D. | electrochemical masking |
| Answer» B. electrochemical milling | |
| Explanation: in advanced machining processes, full form of ecm is electrochemical machining. | |
| 499. |
In the following scientists, who was the one to introduce first patent on ECM? |
| A. | balamuth |
| B. | steve o flawer |
| C. | gusseff |
| D. | mcgeough |
| Answer» C. gusseff | |
| Explanation: gusseff was the one, who introduced the first patent on ecm in 1929. | |
| 500. |
Which of the following material removal mechanisms is implemented by ECM? |
| A. | mechanical abrasion |
| B. | electrochemical dissolution |
| C. | chemical corrosion |
| D. | mechanical erosion |
| Answer» B. electrochemical dissolution | |
| Explanation: in ecm, material is removed by electrochemical dissolution. | |
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