1) The power required for electro-deposition is
a. DC and very low voltage
b. DC and high voltage
c. AC and very low voltage
d. AC and high voltage
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Answer
Explanation
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ANSWER: DC and very low voltage
Explanation:
No explanation is available for this question!
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2) Electroplating is done
a. To protect the metals against corrosion
b. To give shiny appearance to articles
c. To repair the worn out materials
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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3) The metal oxide rectifier used for electrolytic process is placed along with the transformer
a. Inside the oil
b. Outside the transformer but near to it
c. Outside the transformer but far from it
d. Half immersed in the oil
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Answer
Explanation
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ANSWER: Inside the oil
Explanation:
No explanation is available for this question!
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4) Throwing power can be improved by
a. Increasing distance between the anode and cathode
b. By reducing the voltage drop at the cathode
c. By increasing current density
d. Only (a) and (b)
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Answer
Explanation
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ANSWER: Only (a) and (b)
Explanation:
No explanation is available for this question!
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5) Throwing power is the ability of the electrolyte to produce
a. Uniform deposit on an article of regular shape
b. Uniform deposit on an article of irregular shape
c. Non - uniform deposit on an article of regular shape
d. Non - uniform deposit on an article of irregular shape
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Answer
Explanation
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ANSWER: Uniform deposit on an article of irregular shape
Explanation:
No explanation is available for this question!
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6) The energy required for refining of gold in kWh / tone is about
a. 100 to 150
b. 250 to 350
c. 300 to 350
d. 350 to 400
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Answer
Explanation
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ANSWER: 300 to 350
Explanation:
No explanation is available for this question!
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7) The metal which can be extracted from its ore by the method of electrolysis is /are
a. Zinc
b. Aluminium
c. Copper
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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8) According to the Faraday’s first laws of electrolysis, the mass of substance liberated during electrolysis is
a. Directly proportional to the current flowing through the electrolyte
b. Directly proportional to time for which current flows
c. Directly proportional to the charge
d. Only (a) and (b)
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Answer
Explanation
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ANSWER: Only (a) and (b)
Explanation:
No explanation is available for this question!
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9) When sulfate molecules reacts with the water then
a. Hydrogen is liberated
b. Oxygen is liberated
c. Sulphurdioxide is formed
d. All of these
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Answer
Explanation
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ANSWER: Oxygen is liberated
Explanation:
No explanation is available for this question!
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