1. Which of the following can be used as an abrasive carrying medium?
a) Water
b) Benzene
c) Glycerol
d) All of the mentioned
Explanation: Any of the above liquids can be used as abrasive carrying medium.
2. If there is an increase in viscosity of slurry, what happens to MRR?
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
Explanation: As viscosity is increased, material removal rate is decreased.
3. How much percent of the abrasives are recommended in general for abrasive medium?
a) 10 – 15 %
b) 15 – 20 %
c) 25 – 30 %
d) 30 – 35 %
Explanation: In practice, volumetric concentration of abrasives used range between 30 – 35 %
4. Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece.
a) True
b) False
Explanation: In USM, Machining rate increases as the mentioned ratio decreases and vice-versa.
5. As the tool area increases, what happens to MRR?
a) Decreases
b) Increases
c) Remains same
d) None of the mentioned
Explanation: An increase in tool area distributes grains over the work piece, which reduces the machining rate.
6.When the static pressure of the feed is increases, what happens to MRR?
a) Increases
b) Decreases
c) Increase up to a limiting condition
d) Decrease up to a limiting condition
Explanation: As static feed pressure increases, MRR increases up to a limiting condition and then no further increase takes place.
7. 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
Explanation: The full form of WJM is water jet machining in advanced machining processes.
8. What is the key element of water jet machining for material removal?
a) Tool Holder
b) Work piece
c) Water jet
d) Power source
Explanation: Water jet is the one, which is used to cut the work piece and to remove material
9. 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
Explanation: Velocity of water jet stream that is used in Water jet machining is about 900 m/sec
10.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
Explanation: Transducer is not a part of Water jet machining and other components come under WJM.