McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 51. |
What is the frequency of mixing chamber, consisting of gas and abrasives? |
| A. | 10 hz |
| B. | 30 hz |
| C. | 50 hz |
| D. | 70 hz |
| Answer» C. 50 hz | |
| Explanation: mixing chamber consisting of carrier gas and the abrasive grains, vibrates at a frequency of 50 hz. | |
| 52. |
What are the processes where Abrasive jet machining can be used? |
| A. | cleaning |
| B. | cutting |
| C. | deburring |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: abrasive jet machining can be used for deburring, cutting, cleaning and for many other heavy duty applications. | |
| 53. |
In machining system of AJM, which of the following controls the relative motion between work piece and nozzle? |
| A. | cam drives |
| B. | pantographs |
| C. | trace mechanisms |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: relative motion in abrasive jet machining can be controlled by the above mentioned means. | |
| 54. |
Masks, which are used to confine the jet stream location on work piece are made of, which type of materials? |
| A. | copper |
| B. | glass |
| C. | rubber |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: masks can be made of any of the above-mentioned materials. | |
| 55. |
In AJM, what is the mechanism of removal of material from the work piece? |
| A. | corrosion |
| B. | abrasion |
| C. | electron transfer |
| D. | vaporization |
| Answer» B. abrasion | |
| Explanation: in abrasive jet machining, the removal of material takes places by mechanical abrasion, using abrasive grains. | |
| 56. |
In AJM, abrasive jet from the nozzle follows, which type of path for a short distance? |
| A. | parallel |
| B. | inclined |
| C. | perpendicular |
| D. | none of the mentioned |
| Answer» A. parallel | |
| Explanation: abrasive particles follow a parallel path for short distance and then flare outward. | |
| 57. |
Which of the following components, influence the material removal rate in Abrasive jet machining? |
| A. | nozzle |
| B. | carrier gas |
| C. | abrasive grains |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the components mentioned above, influence the rate of material removal, directly or indirectly. | |
| 58. |
In the following properties of nozzle, which of them does not influence the MRR? |
| A. | size |
| B. | wear |
| C. | outside temperature |
| D. | distance from work piece |
| Answer» C. outside temperature | |
| Explanation: the outside temperature of nozzle has no influence on the material removal rate. | |
| 59. |
In the following properties of abrasive grains, which of them changes rate of material removal? |
| A. | size |
| B. | strength |
| C. | shape |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: the above mentioned properties of abrasive grains influence the material removal rate. | |
| 60. |
As the abrasive flow rate increases, what happens to the volumetric removal rate? |
| A. | increases |
| B. | decreases |
| C. | increase and then decrease |
| D. | decrease and then increase |
| Answer» C. increase and then decrease | |
| Explanation: in ajm, volumetric removal rate increases up to a level and then decreases. | |
| 61. |
What is the value of abrasive grain flow rate in Abrasive jet machining? |
| A. | 0.1 – 2 g/min |
| B. | 3 – 20 g/min |
| C. | 30 – 56 g/min |
| D. | 68 – 85 g/min |
| Answer» B. 3 – 20 g/min | |
| Explanation: abrasive grain flow rate is between 3 – 20 g/min, in ajm. | |
| 62. |
What is the value of carrier gas flow rate in Abrasive jet machining? |
| A. | 6 l/min |
| B. | 17 l/min |
| C. | 28 l/min |
| D. | 39 l/min |
| Answer» C. 28 l/min | |
| Explanation: in abrasive jet machining, the flow rate of abrasive carrier gas is around 28 l/min. | |
| 63. |
Which of the following material/s cannot be used for making of nozzle in Abrasive jet machining? |
| A. | tungsten carbide |
| B. | steel alloy |
| C. | sapphire |
| D. | synthetic sapphire |
| Answer» B. steel alloy | |
| Explanation: nozzle in abrasive jet machining is made up of sapphire or wc. | |
| 64. |
What is the life of Tungsten carbide material nozzle? |
| A. | 1 – 8 hrs |
| B. | 2 – 5 hrs |
| C. | 10 – 15 hrs |
| D. | 25 – 40 hrs |
| Answer» C. 10 – 15 hrs | |
| Explanation: nozzle made up of wc material has a life period which range between 10 – 15 hrs. | |
| 65. |
In AJM, what is the life of synthetic sapphire material nozzle? |
| A. | 100 hrs |
| B. | 300 hrs |
| C. | 500 hrs |
| D. | 700 hrs |
| Answer» B. 300 hrs | |
| Explanation: nozzle made up of synthetic sapphire material has a life period which is about 300 hrs. | |
| 66. |
05 mm. |
| A. | 0.01 – 0.10 µm |
| B. | 0.15 – 1.5 µm |
| C. | 2.0 – 5.0 µm |
| D. | 7.0 – 10.0 µm |
| Answer» B. 0.15 – 1.5 µm | |
| Explanation: surface roughness value in ajm varies between 0.15 – 1.5 µm, depending on grain size. | |
| 67. |
Which of the following, are the processes and applications in which Abrasive jet machining can be applied? |
| A. | drilling |
| B. | cutting |
| C. | deburring |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: abrasive jet machining can be used for cutting, drilling, deburring and cleaning processes. | |
| 68. |
Using abrasive jet machining, wire cleaning and insulation stripping take place without affecting the conductor. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: without affecting the conductor, both stripping and cleaning are done, by using abrasive jet machining. | |
| 69. |
In Abrasive jet machining, intricate shapes and holes are machined on which type of materials? |
| A. | brittle |
| B. | thin |
| C. | difficult to machine |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: abrasive jet machining is used to machine, intricate shapes and holes in brittle, thin and difficult to machine materials. | |
| 70. |
State whether the following statement is true or false, about Abrasive jet machining. “Using Abrasive jet machining, micro deburring of hypodermic needles can take place.” |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: abrasive jet machining can be used for micro deburring of hypodermic needles. | |
| 71. |
What are the type of materials that can be machined using Abrasive jet machining? |
| A. | glass |
| B. | sapphire |
| C. | quartz |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: in abrasive jet machining, the above mentioned materials can be machined, which are heat sensitive and brittle. | |
| 72. |
What is the amount of material utilizes when we machine parts using Abrasive jet machining? |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» D. high | |
| Explanation: in abrasive jet machining, material utilization is very high since it removes material by using abrasives. | |
| 73. |
After how much time tool has to be changed in AJM? |
| A. | 1 hr |
| B. | 2 hrs |
| C. | 5 hrs |
| D. | no tool change required |
| Answer» D. no tool change required | |
| Explanation: in abrasive jet machining, tool changes are not required. | |
| 74. |
By using Abrasive jet machining, how much amount of hardening does the materials experience? |
| A. | no hardening |
| B. | very less hardening |
| C. | average hardening |
| D. | high hardening |
| Answer» A. no hardening | |
| Explanation: in abrasive jet machining, hardening is not experienced by the machined materials. | |
| 75. |
Which type of materials cannot be machined using Abrasive jet machining? |
| A. | soft materials |
| B. | hard materials |
| C. | difficult to machine materials |
| D. | none of the mentioned |
| Answer» A. soft materials | |
| Explanation: soft materials such as candy bars, thin softwood etc.., cannot be machined using ajm. | |
| 76. |
Which of the following materials in Abrasive jet machining can be a health hazard? |
| A. | abrasive grains |
| B. | air carrier |
| C. | silica dust |
| D. | none of the mentioned |
| Answer» C. silica dust | |
| Explanation: silica dust, that occurs after machining can be a health hazard in ajm. | |
| 77. |
In AJM, air filters are used to remove which of the following? |
| A. | moisture |
| B. | oil |
| C. | other dust particles |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: before machining, air has to be filtered to remove dust, moisture and oil in the machining system. | |
| 78. |
In advanced machining processes, what is the full form of AWJM? |
| A. | automated water jet machining |
| B. | automated water jet manufacturing |
| C. | abrasive water jet machining |
| D. | abrasive water jet manufacturing |
| Answer» C. abrasive water jet machining | |
| Explanation: full form of awjm is abrasive water jet machining. | |
| 79. |
What are all the types of materials, which can be machined using AWJM? |
| A. | glass |
| B. | ceramics |
| C. | concrete |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: hard to cut materials, which are mentioned above, can be machined using abrasive water jet machining. | |
| 80. |
When compared to the conventional machining, how much times faster, is the Abrasive water jet machining? |
| A. | 5 times |
| B. | 10 times |
| C. | 15 times |
| D. | 20 times |
| Answer» B. 10 times | |
| Explanation: abrasive water jet machining is 10 times faster than the conventional machining. | |
| 81. |
What is the percentage of the abrasives and water in the mixture? |
| A. | 20% water and 80% abrasives |
| B. | 80% water and 20% abrasives |
| C. | 30% water and 70% abrasives |
| D. | 70% water and 30% abrasives |
| Answer» D. 70% water and 30% abrasives | |
| Explanation: abrasive mixture consists of 70 percent water and 30 percent abrasives. | |
| 82. |
What are the materials used for abrasives in Abrasive water jet machining? |
| A. | sic |
| B. | corundum |
| C. | glass beads |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all of the materials mentioned above can be used for making abrasives in abrasive water jet machining. | |
| 83. |
In the machining system of AWJM, which one accelerates the abrasives to remove material? |
| A. | water only |
| B. | water jet stream |
| C. | feeder |
| D. | none of the mentioned |
| Answer» B. water jet stream | |
| Explanation: water jet stream accelerates abrasives but not the water only, to remove material. | |
| 84. |
The introduction of compressed air to the water jet enhances the deburring action. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: compressed air increases the pressure energy of the jet stream, which enhances the material removal rate. | |
| 85. |
What is the grain size of abrasive particles, which are often used for Abrasive water jet machining? |
| A. | 0.01 – 0.50 µm |
| B. | 10 – 150 µm |
| C. | 200 – 500 µm |
| D. | 500 – 1000 µm |
| Answer» B. 10 – 150 µm | |
| Explanation: grain size of the abrasive particles range between 10 – 150 µm in abrasive water jet machining. | |
| 86. |
How is the material removed in Abrasive water jet machining? |
| A. | vaporization |
| B. | electron transfer |
| C. | corrosion |
| D. | erosion |
| Answer» D. erosion | |
| Explanation: in abrasive water jet machining, material removal takes place by the erosion of the work piece material using abrasives accelerated by jet stream. | |
| 87. |
Which of the following is not the feed mechanism of the abrasives in AWJM? |
| A. | side feed |
| B. | cross feed |
| C. | central feed |
| D. | all of the mentioned |
| Answer» B. cross feed | |
| Explanation: only side feed and central feed are used in abrasive water jet machining. | |
| 88. |
In Abrasive water jet machining, how are the abrasives fed into the water jet stream? |
| A. | suspension |
| B. | injection |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» C. all of the mentioned | |
| Explanation: abrasives are fed into the water jet stream through suspension or injection. | |
| 89. |
What is the use of delivery system in the machining system of AWJM? |
| A. | to deliver colloidal solution |
| B. | to pump water |
| C. | to fed abrasives |
| D. | none of the mentioned |
| Answer» B. to pump water | |
| Explanation: in abrasive water jet machining, water delivery system is used. | |
| 90. |
Of the following components, which one does not come under the machining system of AWJM? |
| A. | water delivery system |
| B. | transducer |
| C. | cutting nozzles |
| D. | mixing chambers |
| Answer» B. transducer | |
| Explanation: transducer is the component which does not come under the machining system of awjm. | |
| 91. |
In Abrasive water jet machining, intensifier is used to deliver which type of pressure? |
| A. | very low pressure |
| B. | low pressure |
| C. | medium pressure |
| D. | high pressure |
| Answer» D. high pressure | |
| Explanation: in awjm, intensifier is used to deliver high pressure water using pistons with it. | |
| 92. |
In mixing chamber of AWJM, which of the following are mixed? |
| A. | abrasives and colloidal solution |
| B. | abrasives and water jet |
| C. | colloidal and water jet |
| D. | none of the mentioned |
| Answer» B. abrasives and water jet | |
| Explanation: in mixing chamber, abrasives and water jet stream are mixed. | |
| 93. |
Of the following, which one is a type of suspension in AWJM? |
| A. | direct pumping |
| B. | indirect pumping |
| C. | bypass pumping |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: there are three different types of suspension awj formed by indirect, direct and bypass pumping. | |
| 94. |
In machining system of AWJM, mixing chamber is immediately followed by which of the following component? |
| A. | focusing tube |
| B. | cutting nozzle |
| C. | intensifier |
| D. | water delivery |
| Answer» A. focusing tube | |
| Explanation: in abrasive water jet machining, mixing chamber is immediately followed by the focusing tube. | |
| 95. |
Which of the following energies are absorbed using the catchers in Abrasive water jet machining? |
| A. | pressure energy |
| B. | kinetic energy of abrasives |
| C. | residual energy |
| D. | all of the mentioned |
| Answer» C. residual energy | |
| Explanation: in awjm, catchers are used to absorb the residual energy. | |
| 96. |
Which of the following are different types of catchers used in AWJM? |
| A. | water basin type |
| B. | submerged steel balls type |
| C. | tib2 type |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: the above mentioned types are the types of catchers used in awjm. | |
| 97. |
Which of the following is not a process parameter of Abrasive water jet machining? |
| A. | frequency of vibration |
| B. | orifice diameter |
| C. | pressure |
| D. | stand-off distance |
| Answer» A. frequency of vibration | |
| Explanation: frequency of the vibrations does not belong to the parameters of abrasive water jet machining. | |
| 98. |
Which of the following come under the process parameters of the Abrasive water jet machining? |
| A. | abrasive size |
| B. | machine impact angle |
| C. | traverse speed |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the parameters mentioned above come under abrasive water jet machining | |
| 99. |
10 – 0.30 mm. |
| A. | 1000 – 1500 bar |
| B. | 1500 – 2500 bar |
| C. | 2500 – 4000 bar |
| D. | 4000 – 10000 bar |
| Answer» C. 2500 – 4000 bar | |
| Explanation: in abrasive water jet machining, pressure value will range between 2500 – 4000 bar. | |
| 100. |
Surface roughness depends on which of the following parameters in Abrasive water jet machining? |
| A. | work piece material |
| B. | grit size |
| C. | abrasive type |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: all the parameters mentioned above, are responsible for variation in surface roughness. | |
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