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Advanced Machining
Tough Advanced Machining
Quiz 1
Solution
Q.1.
What is the value of gap voltage maintained in ECG process?
a) 1 to 10 V
b) 4 to 40 V
c) 40 to 400 V
d) 500 to 5000 V
Q.2.
What are the values of current densities used in the ECG process?
a) 1 to 60 A/cm2
b) 60 to 120 A/cm2
c) 120 to 240 A/cm2
d) 240 to 480 A/cm2
Q.3.
Current density depends on which of the following factors?
a) Machined material
b) Gap width
c) Applied voltage
d) All of the mentioned
Q.4.
What is the main mechanism of material removal in Electro chemical grinding?
a) Mechanical erosion of material
b) Electro chemical dissolution
c) Melting and vaporization
d) Electron removal from material
Q.5.
The grinding wheel is _________ and the work piece is ________ in ECG process.
a) Cathode, anode
b) Anode, cathode
c) Cathode, cathode
d) Anode, anode
Q.6.
Mechanical abrasion counts to how much amount of the material removal in ECG?
a) 1 to 5%
b) 5 to 10%
c) 10 to 15%
d) 15 to 20%
Q.7.
Removal rates of ECG process are how may time to that of the conventional machining processes?
a) 2 times
b) 3 times
c) 4 times
d) 5 times
Q.8.
How much amount of burr is produce in Electro chemical grinding process?
a) Less amount
b) Moderate amount
c) High amount
d) No burrs are produced
Q.9.
What are the volumetric removal rates that are obtained in ECG process?
a) 400 mm3/min
b) 800 mm3/min
c) 1600 mm3/min
d) 3200 mm3/min
Q.10.
ECG is a hybrid machining process of which material removal mechanisms below?
a) Mechanical abrasion
b) Electro chemical dissolution
c) Mechanical abrasion & Electro chemical dissolution
d) None of the mentioned
Q.11.
Action of abrasive grains depend on which of the following factors?
a) Electric filed
b) Transport of electrolyte
c) Hydrodynamic effects
d) All of the mentioned
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