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51.

In AJM, surface roughness value will vary between which values?(a) 0.01 – 0.10 µm(b) 0.15 – 1.5 µm(c) 2.0 – 5.0 µm(d) 7.0 – 10.0 µmI got this question in an interview for job.This is a very interesting question from AJM in section Mechanical Processes of Advanced Machining

Answer»

Right OPTION is (b) 0.15 – 1.5 µm

For EXPLANATION: Surface roughness VALUE in AJM varies between 0.15 – 1.5 µm, depending on grain size.

52.

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/minI have been asked this question during an online exam.I need to ask this question from AJM topic in section Mechanical Processes of Advanced Machining

Answer»

The CORRECT answer is (b) 3 – 20 g/min

Explanation: Abrasive GRAIN flow RATE is between 3 – 20 g/min, in AJM.

53.

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 mentionedThe question was posed to me by my college professor while I was bunking the class.My question comes from AJM in chapter Mechanical Processes of Advanced Machining

Answer» RIGHT CHOICE is (d) All of the mentioned

To explain: The above mentioned properties of ABRASIVE grains influence the material REMOVAL rate.
54.

In how many directions, can the cutting takes place in Water jet machining?(a) Uni-directional(b) Bi-directional(c) Multi-directional(d) None of the mentionedThis question was addressed to me in my homework.My query is from WJM in chapter Mechanical Processes of Advanced Machining

Answer» RIGHT option is (c) Multi-directional

Explanation: Water JET machining has multi directional cutting CAPACITY i.e.., in any direction in THREE dimensional space.
55.

Which of the following are the features of tool affecting MRR in USM?(a) Hardness(b) Wearability(c) Accuracy(d) MountingI got this question in final exam.Question is taken from USM topic in portion Mechanical Processes of Advanced Machining

Answer» CORRECT answer is (d) Mounting

To EXPLAIN I WOULD say: DIFFERENT features of tool also affect the material REMOVAL in USM.
56.

Typical roundness error in glass, resulted due to lateral vibrations is between?(a) 01 –20 μm(b) 20 – 40 μm(c) 40 – 140 μm(d) 150 – 250 μmI have been asked this question by my school principal while I was bunking the class.Asked question is from USM in section Mechanical Processes of Advanced Machining

Answer»

Right option is (C) 40 – 140 μm

Best explanation: The roundness is between 40 – 140 μm while MACHINING graphite by Ultrasonic Machining.

57.

What are the materials used for abrasives in Abrasive water jet machining?(a) SiC(b) Corundum(c) Glass beads(d) All of the mentionedI had been asked this question in examination.I'm obligated to ask this question of Abrasive Water Jet Machining topic in section Mechanical Processes of Advanced Machining

Answer» CORRECT option is (d) All of the mentioned

Explanation: All of the materials mentioned above can be USED for making abrasives in Abrasive WATER jet MACHINING.
58.

When was Abrasive water jet machining developed first?(a) 1942(b) 1958(c) 1974(d) 1980I have been asked this question by my school teacher while I was bunking the class.This intriguing question comes from Abrasive Water Jet Machining in chapter Mechanical Processes of Advanced Machining

Answer»

The CORRECT choice is (c) 1974

For EXPLANATION I would SAY: Abrasive WATER jet MACHINING was first developed in the year 1974.

59.

What are all the types of materials, which can be machined using AWJM?(a) Glass(b) Ceramics(c) Concrete(d) All of the mentionedThe question was posed to me in exam.My query is from Abrasive Water Jet Machining in division Mechanical Processes of Advanced Machining

Answer»

Correct answer is (d) All of the MENTIONED

The explanation is: HARD to cut materials, which are mentioned above, can be MACHINED using Abrasive water jet machining.

60.

What are the type of materials that can be machined using Abrasive jet machining?(a) Glass(b) Sapphire(c) Quartz(d) All of the mentionedI got this question in final exam.I want to ask this question from AJM topic in section Mechanical Processes of Advanced Machining

Answer» CORRECT ANSWER is (d) All of the mentioned

Explanation: In Abrasive jet MACHINING, the above mentioned materials can be MACHINED, which are heat sensitive and brittle.
61.

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 mentionedI have been asked this question in exam.This intriguing question comes from AJM topic in chapter Mechanical Processes of Advanced Machining

Answer» CORRECT option is (d) All of the mentioned

To explain: Abrasive jet machining can be used for CUTTING, DRILLING, deburring and CLEANING processes.
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/minI had been asked this question in semester exam.The doubt is from AJM topic in portion Mechanical Processes of Advanced Machining

Answer» RIGHT answer is (c) 28 L/min

The explanation: In ABRASIVE jet MACHINING, the flow rate of abrasive CARRIER gas is around 28 L/min.
63.

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 mentionedThis question was addressed to me during an interview for a job.My query is from Abrasive Jet Machining in portion Mechanical Processes of Advanced Machining

Answer»

Correct option is (d) All of the MENTIONED

The BEST I can explain: Relative motion in Abrasive JET machining can be CONTROLLED by the above mentioned means.

64.

What is the frequency of mixing chamber, consisting of gas and abrasives?(a) 10 Hz(b) 30 Hz(c) 50 Hz(d) 70HzI had been asked this question by my school teacher while I was bunking the class.This interesting question is from Abrasive Jet Machining in chapter Mechanical Processes of Advanced Machining

Answer» CORRECT option is (c) 50 HZ

Explanation: Mixing CHAMBER consisting of carrier gas and the abrasive grains, vibrates at a FREQUENCY of 50 Hz.
65.

In WJM, what are the properties of jet fluid that affect the MRR?(a) Velocity(b) Flow rate(c) Viscosity(d) All of the mentionedI got this question in unit test.Question is taken from WJM in portion Mechanical Processes of Advanced Machining

Answer»

The correct option is (d) All of the MENTIONED

Easy explanation: All the mentioned properties above, of JET FLUID affect the MRR in WATER jet machining.

66.

Which one of the following factors affects the accuracy of parts?(a) Steady abrasive flow(b) Accurate feed(c) Unsteady abrasive flow(d) Ultrasonic frequencyThis question was addressed to me in an online quiz.The above asked question is from USM topic in portion Mechanical Processes of Advanced Machining

Answer»

Correct option is (c) Unsteady abrasive FLOW

To explain I WOULD SAY: Unsteady and uneven abrasive flow affects the DIMENSIONAL ACCURACY.

67.

Drilling in Ultrasonic Machining is done, by which motion of the tool?(a) Only rotation(b) Only oscillation(c) Oscillation and rotation(d) None of the mentionedI have been asked this question in exam.The doubt is from USM topic in chapter Mechanical Processes of Advanced Machining

Answer»

Correct CHOICE is (c) OSCILLATION and rotation

Easiest explanation: The PROCESS, which uses USM for DRILLING, is known as Rotary Ultrasonic Machining (RUM).

68.

Which of the following distribution factors, does not affect the machining parts?(a) Side wear of tool(b) Abrasive wear(c) Accurate feed(d) Form error of toolThis question was posed to me during an online interview.My question is taken from USM topic in chapter Mechanical Processes of Advanced Machining

Answer»

Right choice is (C) Accurate feed

Easy explanation: INACCURATE feed is the factor that affects the ACCURACY of MACHINING PARTS.

69.

When machining porous material, which type of mechanism is introduces?(a) Abrasion(b) Erosion(c) Corrosion(d) VaporizationThis question was addressed to me during an online interview.This is a very interesting question from USM in section Mechanical Processes of Advanced Machining

Answer» RIGHT ANSWER is (b) EROSION

Explanation: MATERIAL removal of porous material TAKES place by erosion.
70.

State whether the following statement is true or false about Magnetic abrasive finishing.(a) “Higher rates of material removal are obtained, with an increase in amplitude and frequency.”(b) True(c) FalseI have been asked this question in an interview for job.The doubt is from MAF in portion Mechanical Processes of Advanced Machining

Answer»

Right option is (a) “HIGHER rates of material REMOVAL are obtained, with an increase in amplitude and frequency.”

To explain I would SAY: As the amplitude and frequency INCREASES, the rate of material removal increases.

71.

Ultrasonic atomizer used in ice particle generator, produces water droplets at which rate?(a) 0.1 ltr/hr to 1 ltr/hr(b) 2 ltr/hr to 12 ltr/hr(c) 20 ltr/hr to 35 ltr/hr(d) 40 ltr/hr to 65 ltr/hrI got this question in an online interview.The question is from Ice Jet Machining in chapter Mechanical Processes of Advanced Machining

Answer»

The correct option is (b) 2 ltr/hr to 12 ltr/hr

The explanation is: ATOMIZER produces DROPLETS at the rate 2 ltr/hr to 12 ltr/hr.

72.

Which of the following component will be present just after the cooling coil?(a) High pressure pump(b) Ice particle generator(c) Cutting nozzle(d) Ultrasonic AtomizerI got this question during an interview for a job.This intriguing question comes from Ice Jet Machining in portion Mechanical Processes of Advanced Machining

Answer» CORRECT choice is (c) CUTTING nozzle

To explain: Prior to nozzle WATER is cooled by COILS that is submerged in liquid nitrogen.
73.

Ice particles of size

Answer»

The correct answer is (a) Stream FREEZING

To elaborate: Ice PARTICLES of size <500 µm are PRODUCED by using stream freezing.

74.

Which of the following are the components of machining system of IJM?(a) High pressure pump(b) Ice particle generator(c) Ultrasonic Atomizer(d) All of the mentionedThis question was addressed to me in class test.This interesting question is from Ice Jet Machining topic in section Mechanical Processes of Advanced Machining

Answer»

Correct choice is (d) All of the MENTIONED

To explain I WOULD say: All the components mentioned above are present in the MACHINING system of IJM.

75.

What is the value of stand-off distance in Abrasive water jet machining?(a) 1.0 – 2.0 mm(b) 2.0 – 4.0 mm(c) 4.0 – 6.0 mm(d) 6.0 – 10.0 mmI had been asked this question in a national level competition.The question is from AWJM in portion Mechanical Processes of Advanced Machining

Answer»

Correct option is (a) 1.0 – 2.0 MM

To ELABORATE: Stand-off distance in Abrasive WATER JET machining will vary between 1 – 2 mm.

76.

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 mentionedThe question was posed to me during a job interview.This interesting question is from AWJM topic in section Mechanical Processes of Advanced Machining

Answer»

The correct choice is (d) All of the MENTIONED

To elaborate: The above mentioned types are the types of catchers USED in AWJM.

77.

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 mentionedThe question was posed to me in unit test.I'm obligated to ask this question of AWJM topic in division Mechanical Processes of Advanced Machining

Answer» CORRECT OPTION is (c) All of the mentioned

The explanation: Abrasives are FED into the water JET stream through suspension or INJECTION.
78.

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 pieceThe question was posed to me in an interview.Enquiry is from AJM topic in division Mechanical Processes of Advanced Machining

Answer»

The CORRECT ANSWER is (c) Outside temperature

Easiest explanation: The outside temperature of nozzle has no INFLUENCE on the MATERIAL removal rate.

79.

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 mentionedI have been asked this question in final exam.This interesting question is from Abrasive Jet Machining in chapter Mechanical Processes of Advanced Machining

Answer» CORRECT ANSWER is (d) All of the mentioned

Easy explanation: Masks can be MADE of any of the above-mentioned materials.
80.

In WJM, surface treatment includes which type of processes?(a) Removing deposits(b) Removing chemicals(c) Degreasing(d) All of the mentionedThe question was posed to me by my college director while I was bunking the class.This is a very interesting question from WJM topic in portion Mechanical Processes of Advanced Machining

Answer»

Correct option is (d) All of the mentioned

To elaborate: Surface treatment is DONE using WJM to clean the surface from many TOXIC chemical, DEPOSITS, residues ETC.

81.

Which type of materials can be machined using Abrasive jet machining?(a) Glass(b) Ceramics(c) Hard materials(d) All of the mentionedThe question was asked in an online quiz.Origin of the question is Abrasive Jet Machining topic in portion Mechanical Processes of Advanced Machining

Answer»

Correct ANSWER is (d) All of the mentioned

The BEST I can explain: Materials like ceramics, glass, HARD and super hard materials can be machined USING Abrasive jet machining.

82.

For obtaining a better finish using Magnetic abrasive finishing, tubes are rotated at which speeds?(a) Very low(b) Low(c) Medium(d) Very HighThis question was addressed to me in homework.This intriguing question originated from MAF in section Mechanical Processes of Advanced Machining

Answer»

The CORRECT option is (d) Very HIGH

Best explanation: To OBTAIN a better finish in Magnetic abrasive finishing, TUBES are rotated at very high speeds.

83.

Which of the following applications where MAF is used?(a) Finishing of inner surfaces(b) Polishing of balls and rollers(c) Chamfering and deburring of gears(d) All of the mentionedThe question was asked at a job interview.The doubt is from MAF in division Mechanical Processes of Advanced Machining

Answer» CORRECT CHOICE is (d) All of the mentioned

The EXPLANATION is: All the APPLICATIONS mentioned above can be fulfilled using MAF.
84.

What is the value of the limited depth to which form errors, tapers, looping can be corrected?(a) 10 microns(b) 20 microns(c) 30 microns(d) 40 micronsThe question was posed to me by my college director while I was bunking the class.My doubt stems from MAF topic in chapter Mechanical Processes of Advanced Machining

Answer»

Right choice is (b) 20 MICRONS

For explanation: Form errors, tapers, looping etc.., can be CORRECTED up to a LIMITED DEPTH of 20 microns.

85.

When compared to sand, how much effective is garnet as abrasive material in AWJM?(a) 20%(b) 30%(c) 40%(d) 50%I have been asked this question at a job interview.This intriguing question comes from AWJM in chapter Mechanical Processes of Advanced Machining

Answer» CORRECT option is (b) 30%

For explanation I would say: Garnet, which is commonly USED abrasive MATERIAL is NEARLY 30% more effective than sand in Abrasive water JET machining.
86.

Which of the following gas, should never be used as the carrier of abrasives?(a) Nitrogen(b) CO2(c) Oxygen(d) AirThis question was addressed to me during an online interview.My question is taken from Abrasive Jet Machining topic in chapter Mechanical Processes of Advanced Machining

Answer»

The correct option is (c) Oxygen

The explanation is: Oxygen should not be USED as CARRIER because it causes a VIOLENT chemical reaction with abrasives or work piece.

87.

What is the pressure of gas that is to be supplied, for carrying the abrasives?(a) 0.1 to 1.0 kg/cm^2(b) 2.0 to 8.0 kg /cm^2(c) 10.0 to 18.0 kg/cm^2(d) 25.0 to 35.5 kg/cm^2This question was addressed to me by my school principal while I was bunking the class.This question is from Abrasive Jet Machining topic in section Mechanical Processes of Advanced Machining

Answer» RIGHT CHOICE is (b) 2.0 to 8.0 kg /cm^2

Easy explanation: The pressure of the carrying GAS should range between 2 to 8 kg/cm^2.
88.

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 mentionedI had been asked this question during an interview.Enquiry is from AJM topic in chapter Mechanical Processes of Advanced Machining

Answer»

The correct CHOICE is (d) All of the mentioned

For explanation I would say: All the components mentioned above, INFLUENCE the rate of MATERIAL removal, directly or INDIRECTLY.

89.

State whether the following statement is true or false.(a) “To start the cuts in Water jet machining, pre-drilled holes are not necessary.”(b) True(c) FalseI had been asked this question during an online exam.The above asked question is from WJM in division Mechanical Processes of Advanced Machining

Answer» RIGHT choice is (b) True

Easy EXPLANATION: In Water jet machining, we NEED not require any pre-drilled holes to START the cuts.
90.

In deburring, which combination removes the material from non-metallic materials?(a) High pressure and low flow rate(b) High pressure and high flow rate(c) Low pressure and low flow rate(d) Low pressure and high flow rateThe question was asked in a job interview.This interesting question is from WJM topic in division Mechanical Processes of Advanced Machining

Answer»

Right answer is (a) HIGH pressure and low FLOW rate

To ELABORATE: For non-metallic materials high pressure and LOWER flow rates are used in deburring.

91.

What are the uses of catcher in machining system of Water jet machining?(a) Collecting dirt(b) Collection of debris(c) Reduce noise levels(d) All of the mentionedI got this question in exam.Enquiry is from Water Jet Machining topic in section Mechanical Processes of Advanced Machining

Answer»

The correct choice is (d) All of the mentioned

Explanation: Catcher in WJM is USED to COLLECT the DIRT, MACHINED debris and reduce the noise LEVELS.

92.

What is the expected life of the nozzles used in WJM?(a) 10 hrs(b) 20 hrs(c) 100 hrs(d) 200 hrsI had been asked this question during an interview.My enquiry is from Water Jet Machining in portion Mechanical Processes of Advanced Machining

Answer» CORRECT CHOICE is (d) 200 hrs

For explanation: The LIFE that is expected from the nozzle, which is a part of MACHINING system, is 200 hrs.
93.

What is the limit of surface area that is to be machined using USM?(a)

Answer»

The CORRECT option is (c) <1000 mm^2

The explanation: If the surface area to be MACHINED is above 1000 mm^2, this type of MACHINING will not be apt for the PARTS.

94.

Which of the following can be used as an abrasive carrying medium?(a) Water(b) Benzene(c) Glycerol(d) All of the mentionedI have been asked this question in an international level competition.I'd like to ask this question from USM in portion Mechanical Processes of Advanced Machining

Answer» CORRECT choice is (d) All of the mentioned

Explanation: Any of the above LIQUIDS can be used as ABRASIVE CARRYING medium.
95.

What happens to MRR with increase in tool amplitude?(a) Increases(b) Decreases(c) Remains same(d) None of the mentionedI had been asked this question during an interview.This intriguing question originated from USM in chapter Mechanical Processes of Advanced Machining

Answer» CORRECT CHOICE is (a) Increases

Best EXPLANATION: As amplitude of the TOOL increases, RATE of material removal increases.
96.

As the vibration frequency increases, what happens to material removal rate?(a) Decreases(b) Increases(c) Increase and then decrease(d) Decrease and then increaseI have been asked this question in an online quiz.My question comes from USM in portion Mechanical Processes of Advanced Machining

Answer» RIGHT option is (C) Increase and then decrease

Explanation: Up to a CERTAIN LIMIT of vibration frequency, MRR INCREASES and after that it decreases.
97.

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 mentionedI have been asked this question during an interview for a job.Question is taken from AWJM topic in section Mechanical Processes of Advanced Machining

Answer»

Right answer is (B) CROSS FEED

For explanation: Only side feed and CENTRAL feed are used in ABRASIVE water jet machining.

98.

Magnetic Abrasive finishing is used for which of the following application/s?(a) Surface finishing(b) Cutting(c) Drilling(d) BoringThis question was posed to me in exam.I want to ask this question from Magnetic Abrasive Finishing in division Mechanical Processes of Advanced Machining

Answer»

Correct OPTION is (a) Surface FINISHING

Explanation: Magnetic abrasive finishing is a process, which is opted for finishing of parts that are ALREADY machined on the other MACHINES.

99.

In AJM, air filters are used to remove which of the following?(a) Moisture(b) Oil(c) Other dust particles(d) All of the mentionedI had been asked this question in an international level competition.This key question is from AJM in division Mechanical Processes of Advanced Machining

Answer»

Right OPTION is (d) All of the mentioned

For explanation I would say: Before MACHINING, air has to be filtered to remove dust, moisture and oil in the machining SYSTEM.

100.

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 mentionedThe question was posed to me during an internship interview.My question is based upon AJM in section Mechanical Processes of Advanced Machining

Answer»

The correct ANSWER is (a) Soft materials

For EXPLANATION I WOULD SAY: Soft materials such as candy bars, thin softwood etc.., cannot be machined using AJM.