1. Which of the following is not an advantage of Water jet machining?
a) Burr produced is minimal
b) No Heat is produced
c) Relatively low hourly rates
d) Environmentally safe
Explanation: Costs per hour are relatively high in Water jet machining.
2. In Water jet machining, tool need not require sharpening once the machining is done.
a) True
b) False
Explanation: Tool does not wear in water jet machining, so it need not be sharpened.
3. Which of the following secondary processes are eliminated in Water jet machining?
a) Grinding of surface
b) Surface treatment
c) Polishing of surface
d) All of the mentioned
Explanation: All the mentioned secondary processes above, are eliminated in Water jet machining.
4. How many parts are cut using Water jet machining, on a single blank?
a) One part
b) Two parts
c) Three parts
d) Multiple parts
Explanation: Depending up on the kerf width, multiple parts can be machined using a single blank
5. Which of the following is the disadvantage of water jet machining?
a) Narrow kerf width
b) Small diameter of nozzle
c) Not suitable for mass production
d) Burr is minimal
Explanation: Due to high maintenance, WJM cannot be used for mass production
6. In AJM, what is the mechanism of removal of material from the work piece?
a) Corrosion
b) Abrasion
c) Electron transfer
d) Vaporization
Explanation: In Abrasive jet machining, the removal of material takes places by mechanical abrasion, using abrasive grains.
7. 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
Explanation: Abrasive particles follow a parallel path for short distance and then flare outward.
8. 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
Explanation: All the components mentioned above, influence the rate of material removal, directly or indirectly.
9. 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
Explanation: The outside temperature of nozzle has no influence on the material removal rate.
10. 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
Explanation: The above mentioned properties of abrasive grains influence the material removal rate