Question 61 : The grinding wheel is _____ and the work piece is ____ in ECG process.
1. Cathode, anode
2. Anode, cathode
3. Cathode, cathode
4. Anode, anode
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Question 62 : What is the main mechanism of material removal in Electro chemical grinding?
1. Mechanical erosion of material
2. Electro chemical dissolution
3. Melting and vaporization
4. Electron removal from material
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Question 63 : Current density depends on which of the following factors?
1. Machined material
2. Gap width
3. Applied voltage
4. All of the mentioned
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Question 64 : What are the values of current densities used in the ECG process?
1. 1 to 60 A/cm²
2. 60 to 120 A/cm²
3. 120 to 240 A/cm²
4. 240 to 480 A/cm²
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Question 65 : What is the value of gap voltage maintained in ECG process?
1. 1 to 10 V
2. 4 to 40 V
3. 40 to 400 V
4. 500 to 5000 V
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Question 66 : State whether following statement is true or false regarding the material removal in ECG.
'In ECG, material removal is not continuous using abrasive.'
1. True
2. False
3.
4.
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Question 67 : What are the values of current used in ECG?
1. 1 to 50 A
2. 50 to 300 A
3. 300 to 600 A
4. 600 to 1000 A
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Question 68 : What are the values of surface speeds at which the wheel rotates?
1. 5 to 15 m/s
2. 10 to 20 m/s
3. 20 to 35 m/s
4. 40 to 60 m/s
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Question 69 : Which of the following electrolytes are used for machining purpose in ECG?
1. Sodium nitrate
2. Hydro chloric acid
3. Nitric acid
4. Potassium permanganate
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Question 70 : What is the value of the grit number of the abrasives used in ECG?
1. 1 - 20
2. 20 - 60
3. 60 - 320
4. 350 - 640
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