Abrasive Jet - Water Jet - Abrasive Water Jet Machining & Ultrasonic Machining
Abrasive Jet Machining
1. In advanced
machining processes, what is the full form of AJM?
a) Automatic Jet Manufacturing
b) Abrasive Jet Machining
c) Automated Jet Machining
d) Abrasive Jet Manufacturing
Answer: b
Explanation: In advanced machining processes, full form of AJM is Abrasive jet
machining.
2. In AJM, which of
the following materials are used as abrasive grains?
a) Al2O3
b) SiC
c) Glass beads
d) All of the mentioned
Answer: d
Explanation: In Abrasive jet machining, any of the particles mentioned above
can be used as abrasive grains.
3. In Abrasive jet
machining, work piece material of removed by which of the following means?
a) Vaporization
b) Electro plating
c) Mechanical abrasion
d) Corrosion
Answer: c
Explanation: Abrasive particles hit the surface with high pressure and high
velocities, which removes the material.
4. Which type of
materials can be machined using Abrasive jet machining?
a) Glass
b) Ceramics
c) Hard materials
d) All of the mentioned
Answer: d
Explanation: Materials like ceramics, glass, hard and super hard materials can
be machined using Abrasive jet machining.
5. In machining system
of AJM, which is the medium of carrying the abrasive grains for machining?
a) Liquids
b) Gases
c) Any fluids
d) None of the mentioned
Answer: b
Explanation: In AJM, different types of gases are used as the medium for
carrying abrasives.
6. In machining system
of AJM, what is/are the gas/es used for carrying the abrasives?
a) CO2
b) Air
c) Nitrogen
d) All of the mentioned
Answer: d
Explanation: In AJM, gases like CO2, air or nitrogen
are used to carry the abrasives.
7. What is the
pressure of gas that is to be supplied, for carrying the abrasives?
a) 0.1 to 1.0 kg/cm2
b) 2.0 to 8.0 kg /cm2
c) 10.0 to 18.0 kg/cm2
d) 25.0 to 35.5 kg/cm2
Answer: b
Explanation: The pressure of the carrying gas should range between 2 to 8 kg/cm2.
8. Which of the
following gas, should never be used as the carrier of abrasives?
a) Nitrogen
b) CO2
c) Oxygen
d) Air
Answer: c
Explanation: Oxygen should not be used as carrier because it causes a violent
chemical reaction with abrasives or work piece.
9. 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
Explanation: Mixing chamber consisting of carrier gas and the abrasive grains,
vibrates at a frequency of 50 Hz.
10. In Abrasive jet
machining, what may be the size of the abrasive grains used?
a) 10 – 40 µm
b) 50 – 100 µm
c) 100 – 150 µm
d) 200 – 300 µm
Answer: a
Explanation: Abrasive grains of size, between 10 – 40 µm can be used for
machining.
11. What are the
processes where Abrasive jet machining can be used?
a) Cleaning
b) Cutting
c) Deburring
d) All of the mentioned
Answer: d
Explanation: Abrasive jet machining can be used for deburring, cutting,
cleaning and for many other heavy duty applications.
12. State whether the
following statement is true or false.
“In Abrasive jet machining, commercial grades powders can be used for
machining.”
a) True
b) False
Answer: b
Explanation: For AJM, commercial grade powders are not used because their sizes
are not classified widely.
13. 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
Explanation: Relative motion in Abrasive jet machining can be controlled by the
above mentioned means.
14. 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
Explanation: Masks can be made of any of the above-mentioned materials.
Water Jet Machining
1. What is the full
form of WJM in advanced machining processes?
a) Water Jack Manufacturing
b) Water Jet Machining
c) Water Jet Manufacturing
d) Water Jack Manufacturing
Answer: b
Explanation: The full form of WJM is water jet machining in advanced machining
processes.
2. What is the key
element of water jet machining for material removal?
a) Tool Holder
b) Work piece
c) Water jet
d) Power source
Answer: c
Explanation: Water jet is the one, which is used to cut the work piece and to
remove material.
3. What is the
velocity of the water jet stream in water jet machining?
a) 100 m/sec
b) 300 m/sec
c) 700 m/sec
d) 900 m/sec
Answer: d
Explanation: Velocity of water jet stream that is used in Water jet machining
is about 900 m/sec.
4. Which
of the following is not a part of machining system of Water jet machining?
a) Transducer
b) Accumulator
c) Jet cutting nozzle
d) Hydraulic pump
Answer: a
Explanation: Transducer is not a part of Water jet machining and other
components come under WJM.
5. What
is the general power rating of the hydraulic pump, used in WJM?
a) 10 kW
b) 20 kW
c) 30 kW
d) 40 kW
Answer: c
Explanation: The power rating of the motor of hydraulic pump, which is used in
WJM is about 30 kW.
6. Which
of the following are the components of intensifier present in water jet
machining system?
a) Piston
b) Plunger
c) Limit switch
d) All of the mentioned
Answer: d
Explanation: The above mentioned components are present in the intensifier of
water jet machining.
7.
Intensifier increases the pressure water by which of the following values?
a) 10 – 100 MPa
b) 100 – 200 MPa
c) 200 – 400 MPa
d) 400 – 1000 MPa
Answer: c
Explanation: Use of intensifier is to increase the inlet water pressure to 200
– 400 MPa.
8. On
which property of water, will the accumulator in Water jet machining rely on?
a) Density
b) Compressibility
c) Viscosity
d) Velocity
Answer: b
Explanation: Accumulator relies on compressibility of water (12% at 3800bar),
in order to maintain a uniform discharge pressure in WJM.
9. What
are the values of typical tube diameters in the machining system in WJM?
a) 0.1 to 1 mm
b) 1 to 6 mm
c) 6 to 14 mm
d) 14 to 25 mm
Answer: c
Explanation: Typical tube diameter values range between 6 to 14 mm.
10. What
is the expected life of the nozzles used in WJM?
a) 10 hrs
b) 20 hrs
c) 100 hrs
d) 200 hrs
Answer: d
Explanation: The life that is expected from the nozzle, which is a part of
machining system, is 200 hrs.
11. Which
of the following does not damage the nozzle used in Water jet machining?
a) Particles of dirt
b) Mineral deposits
c) Water
d) All of the mentioned
Answer: c
Explanation: Only dirt particles and mineral deposits are responsible for
damage of nozzle.
12. 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 mentioned
Answer: d
Explanation: Catcher in WJM is used to collect the dirt, machined debris and
reduce the noise levels.
13. Distance between
which components, is the stand-off distance?
a) Nozzle-inlet and work piece top
b) Nozzle-outlet and work piece-top
c) Nozzle-inlet and work piece-bottom
d) Nozzle-outlet and work piece-bottom
Answer: b
Explanation: Stand-off distance is the distance between the top of work piece
and nozzle outlet.
14. What is the value
of diameter of the jet cutting nozzle in WJM?
a) 0.01 – 0.1 mm
b) 0.1 – 0.3 mm
c) 0.3 – 0.7 mm
d) 0.7 – 1.5 mm
Answer: b
Explanation: In WJM, diameter of the nozzles range between 0.10 – 0.30 mm.
15. What is the value
of stand-off distance in Water jet machining?
a) 0.1 – 1 mm
b) 1 – 2 mm
c) 2 – 6 mm
d) 6 – 14 mm
Answer: c
Explanation: Stand-off distance value ranges between 2.5 – 6 mm in Water jet
machining.
Abrasive Water Jet Machining
1. 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
Explanation: Full form of AWJM is Abrasive Water Jet Machining.
2. 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
Explanation: Hard to cut materials, which are mentioned above, can be machined
using Abrasive water jet machining.
3. When was Abrasive
water jet machining developed first?
a) 1942
b) 1958
c) 1974
d) 1980
Answer: c
Explanation: Abrasive water jet machining was first developed in the year 1974.
4. 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
Explanation: Abrasive water jet machining is 10 times faster than the
conventional machining.
5. 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
Explanation: Abrasive mixture consists of 70 percent water and 30 percent
abrasives.
6. 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
Explanation: All of the materials mentioned above can be used for making
abrasives in Abrasive water jet machining.
7. 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
Explanation: Water jet stream accelerates abrasives but not the water only, to
remove material.
8. The
introduction of compressed air to the water jet enhances the deburring action.
a) True
b) False
Answer: a
Explanation: Compressed air increases the pressure energy of the jet stream,
which enhances the material removal rate.
9. 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
Explanation: Grain size of the abrasive particles range between 10 – 150 µm in
Abrasive water jet machining.
10. How
is the material removed in Abrasive water jet machining?
a) Vaporization
b) Electron transfer
c) Corrosion
d) Erosion
Answer: d
Explanation: In Abrasive water jet machining, material removal takes place by
the erosion of the work piece material using abrasives accelerated by jet
stream.
11. 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
Explanation: Only side feed and central feed are used in Abrasive water jet
machining.
12. 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
Explanation: Abrasives are fed into the water jet stream through suspension or
injection.
13. 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
Explanation: In Abrasive water jet machining, water delivery system is used.
14. 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
Explanation: In AWJM, intensifier is used to deliver high pressure water using
pistons with it.
15. 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
Explanation: In mixing chamber, abrasives and water jet stream are mixed.
ULTRASONIC MACHINING
1. Who discovered USM?
a) Balamuth
b) Paul O Flawer
c) Turing
d) Steve John
Answer: a
Explanation: Balamuth was the scientist, who discovered Ultrasonic Machining.
2. What is the full
form of USM in advanced machining process?
a) Ultrasound manufacturing
b) Ultrasonic machining
c) UV spectrum manufacturing
d) Ultra sonar machining
Answer: b
Explanation: Full form of USM in advanced machining processes, is Ultrasonic
machining.
3. USM removes
materials using the ____________ tool.
a) Perpendicularly rotating
b) Perpendicularly oscillating
c) Axially oscillating
d) Inclined oscillating
Answer: c
Explanation: Material is removed using axial oscillating tool.
4. Which
is softer material in USM?
a) Tool
b) Work piece
c) Tool & Work piece
d) None of the mentioned
Answer: a
Explanation: Tool is softer than work piece in USM.
5.
Frequency of tool’s oscillation in USM ranges between ________
a) 5-10 kHz
b) 10-15 kHz
c) 18-20 kHz
d) 25-50 kHz
Answer: c
Explanation: Frequency used in USM is between 18 – 20 kHz.
6.
Amplitude of oscillation of tool in USM ranges between ________
a) 0.1-10 μm
b) 10-40 μm
c) 50-100 μm
d) 100-1000 μm
Answer: b
Explanation: The optimal range used is between 10-40 μm.
7. In
which year, discovery of USM took place?
a) 1910
b) 1925
c) 1943
d) 1945
Answer: d
Explanation: Ultrasonic Machining was discovered in 1945.
8. The
machining system of USM contains which of the following components?
a) Magnetostrictor
b) Concentrator
c) Tools and slurry
d) All of the mentioned
Answer: d
Explanation: In machining system of USM, the above-mentioned components have to
be present.
9. In
Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency.
a) True
b) False
Answer: a
Explanation: To oscillate, magnetostrictor must be energized to the ultrasonic
frequency in USM.
10. Of
the following scientists, who discovered magnetostrictor effect?
a) Balamuth
b) Steve O Flawer
c) Joule
d) Turing
Answer: c
Explanation: This effect was discovered by Joule in 1874 at Manchester.
11. In
Ultrasonic Machining, magnetostrictor converts magnetic energy into which type
of energy?
a) Mechanical energy
b) Electrical energy
c) Thermal energy
d) None of the mentioned
Answer: a
Explanation: Oscillation of magnetostrictor takes place by converting magnetic
energy to mechanical energy.
12. What
is the value of the amplitude obtained without mechanical amplifier?
a) 0.0001 – 0.001 µm
b) 0.001 – 0.1 µm
c) 1 – 10 µm
d) 10 – 100 µm
Answer: b
Explanation: Relatively very small amplitudes are obtained without amplifier.
13. What
is the value of the amplitude obtained when we use mechanical amplifier?
a) 1 – 10 µm
b) 10 – 40 µm
c) 40 – 50 µm
d) 50 – 100 µm
Answer: c
Explanation: Relatively larger amplitudes are obtained when amplifier is used.
14. In
USM, tool tips must have low resistance and fatigue strength.
a) True
b) False
Answer: b
Explanation: In USM, tool tips should must have high wear resistance and
fatigue strength.
15. At
what rate slurry is pumped through nozzle in USM?
a) 10 L/min
b) 25 L/min
c) 50 L/min
d) 75 L/min
Answer: b
Explanation: Slurry is pumped through nozzle at the rate of 25 L/min, L-
litres.
Ref:
https://www.sanfoundry.com/advanced-machining-questions-answers-water-jet-machining-introduction-machining-system/
