| Post Name | Trade Instructor Gr II (Electroplating) |
|---|---|
| Department | Technical Education |
| Question Paper Code | 051/2024/OL |
| Category Code | 092/2023 |
| Date of Test | 10 May 2024 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
What is the electron conļ¬guration of copper atom ?
Answer
B. 2,8,18,1
2
How many electrons pass through a conductor in one second having resistance of one ohm with a potential diļ¬erence of one volt causes one ampere current passed through it ?
Answer
C. 6.24 Ć
3
What is call the quantity of electricity transferred in one second by a current of one ampere ?
Answer
D. COULOMB
4
What is the coeļ¬cient of linear expansion of copper at 20Ā°C ?
Answer
A. 17 Ć
5
What is the tensile strength of Aluminum conductor in NW/mmĀ² ?
Answer
B. 70
6
What is the melting point of copper ?
Answer
C. 1083Ā°C
7
What is the accuracy of a metric outside micrometer ?
Answer
D. 0.01 mm
8
What is the total/eļ¬ective resistance of a circuit having Three 3Ī© resistance are connected in parallel ?
Answer
A. 1Ī©
9
Which is the smallest unit of work done in CGS system ?
Answer
B. Erg
10
Which name the power that occurs inside the motor ?
Answer
C. Indicated Horse Power
11
The number of neutrons in is
Answer
C. 46
12
Which of the following represents the correct order of decreasing metallic characters for elements Si, Be, Mg, Na and P ?
Answer
D. Na > Mg > Be > Si > P
13
The pH of 0.01 M HCl aqueous solution is
Answer
B. 2
14
The hydrolysis product of which among the following salts will have acidic behaviour
Answer
D. NHāCl
15
Which among the following is not a scale of electronegativity of elements ?
Answer
B. Jeļ¬erson scale
16
Predict the formula of the stable binary compound formed by the combination of beryllium and hydrogen.
Answer
A. BeHā
17
The atomic number of Cr and Mn are 24 and 25 respectively. The electronic configuration 1sĀ²2sĀ²2pā¶3sĀ²3pā¶3dāµ represents
Answer
B. Crāŗ
18
Hard water is softened by using calgon. Chemically calgon is
Answer
D. NaāPāOāā
19
Which among the following is an example for a basic buffer solution?
Answer
D. NHāOH+NHāCl
20
Mathematical expression of Heisenberg's uncertainty principle for motion of microscopic objects is (Where, Īx ā uncertainty in position, Ī ā uncertainty in momentum, Ī ā uncertainty in velocity)
Answer
A. Īx Ī ā„
21
During electroplating the substance to be plated will act as
Answer
C. Cathode
22
Which of the following is a secondary cell ?
Answer
D. Lead storage battery
23
What is the potential of standard hydrogen electrode when it is coupled with Cu cell ?
Answer
B. 0V
24
Which among the following is an electrolyte?
Answer
B. Molten NaCl
25
In an electrochemical cell which among the statement is correct ? I. Oxidation occurs at the cathode II. Reduction occurs at the cathode III. Redox reaction occurs at the anode IV. Oxidation occurs at the anode
Answer
D. II and IV
26
What is the product obtained at cathode when aqueous NaCl is electrolysed?
Answer
A. Hā
27
One Faraday stands for
Answer
C. Charge of one mole electrons
28
Who was ļ¬rst described the quantitative aspect of electrolysis ?
Answer
B. Michael Faraday
29
How much electricity is needed to deposit one mole of Aluminium ?
Answer
C. 3F
30
Electrochemical equivalent is
Answer
A. Mass of substance deposited/F
31
Which is the name of process that cleans the metal in acid to remove corrosion products from the surface ?
Answer
A. Pickling
32
Which type of corrosion produces attack in the form of spots, pits on holes ?
Answer
D. Pitting corrosion
33
Which one of the following metal has high resistance to corrosion in sea shore area ?
Answer
B. Cadmium
34
Which plating have the special properties like high hardness, low co- eļ¬cient of friction, high resistance to corrosion and ability to withstand high temperature ?
Answer
D. Hard chromium
35
Which process is used to deposit one metal over another metal for protection against corrosion ?
Answer
A. Electroplating
36
Which one of the following coating is not used for decorative ļ¬nishing ?
Answer
B. Cadmium plating
37
Which process follows polishing in electroplating ?
Answer
B. Buļ¬ng
38
Which gas is normally liberated from the cathode of plating bath ?
Answer
C. Hydrogen
39
What is "Stop-Oļ¬" in electroplating ?
Answer
C. Masking applied where plating is not required
40
What is the need of eļ¬uent treatment in electroplating ?
Answer
A. Dispose Polluted water
41
Which is the reason for using lining tank for electroplating ?
Answer
A. For not reacting with chemicals
42
What is the purpose of lead lained heater used for chromium plating ?
Answer
C. To increase Bath Temperature
43
Which is the method for removing suspended matters from the zinc plating solution ?
Answer
A. Filter the solution
44
What is the name of the material used to reduce the loss of heat and evaporation in chromium plating bath ?
Answer
D. Polypropylene chroļ¬es
45
Which is the equipment extensively used for the ļ¬nal drying out of rack components to ensure rapid drying ?
Answer
A. Hot air ovens
46
What is the main application of plating barrel ?
Answer
B. Bulk production of wide verity of small articles
47
Which equipment is used in electroplating industry to converts alternating current to direct current ?
Answer
D. Rectiļ¬er
48
Which chemical is used for vapour degreasing ?
Answer
A. Trichloroethylene
49
Which instrument is used to measure pH value quick and more accurately ?
Answer
A. pH meter
50
_______ is a process in which cations or anions are captured from solutions, with the help of artiļ¬cial polymeric resins, produce de-ionised water.
Answer
C. Ion exchange
51
Which is the common abrasive used for mechanical polishing ?
Answer
A. Emery
52
Which mop is used for polishing the inside of cup shaped articles ?
Answer
C. Bottom mop
53
Which treatment is used in sand blasting for the removal of sand from its surface ?
Answer
D. Hydroļ¬ouric acid pickling
54
Which neutralizing dip is used to reduce rusting after the acid pickled steel parts ?
Answer
A. Alkaline solution
55
Which is the name of the process that cleans the metal in acid to remove corrosion products from the surface ?
Answer
A. Pickling
56
Which is used for additional polishing in barrel plating ?
Answer
D. Leather pieces
57
What is the ļ¬rst step in a chemical cleaning cycle employed for heavily contaminated items ?
Answer
A. Solvent cleaning
58
Which of the process includes degreasing and pickling ?
Answer
C. Pre Treatment
59
Which cleaning process the cleaning action is generated by sound waves ?
Answer
C. Ultrasonic cleaning
60
Which method of masking is suitable for masking process during hard chromium plating ?
Answer
C. Stop oļ¬ lacquer
61
What are the chemicals contained in electrolyte for copper plating in acid bath ?
Answer
A. Copper sulphate and Sulphuric acid
62
Which is the function of boric acid in nickel plating ?
Answer
B. Buļ¬er
63
Which bath is generally used for providing an undercoat for nickel- chromium plating ?
Answer
C. Cyanide copper bath
64
Which is the reason that metallic chromium anodes are not used for chromium plating ?
Answer
C. Quickly dissolved in chromium bath
65
Which type of plating is used for cylinder piston parts ?
Answer
A. Hard chromium
66
What is the major application of zinc ?
Answer
B. Alloying and Galvanizing
67
What kind of damage for metal or alloy caused by absorption of hydrogen ?
Answer
A. Hydrogen embrittlement
68
Which is the traditional coating used in the production of food cans ?
Answer
D. Tin
69
Which is the cathode eļ¬ciency of acid Tin plating solution ?
Answer
D. 98 to 100%
70
What is the process of removal of coating from its base metal ?
Answer
C. Stripping
71
Which is the term used for ļ¬ash gold plating of ornaments ?
Answer
A. Gilding
72
What is necessary to avoid roughness of deposit due to insoluble particles in the plating solution ?
Answer
C. Filtration
73
What is the reason for using cyanide copper plating on complex shaped components ?
Answer
C. High throwing power
74
Which chemical should be added time to time for maintaining the cyanide content of the cyanide copper plating bath ?
Answer
D. Sodium cyanide
75
Which is the application of cadmium plating ?
Answer
A. Marine equipment
76
What is the reason for burnt deposit in copper plating ?
Answer
D. High current
77
Which process provides an eļ¬ective method for the removal of organic impurities from nickel plating solution ?
Answer
D. Activated carbon treatment
78
Which is added to correct the excess sulphate in bright chromium plating bath ?
Answer
B. Barium carbonate
79
What is the reason for hard chromium deposit having milky appearance ?
Answer
A. Temperature too high
80
Which is the possible cause of non-deposition in chromium plating ?
Answer
C. Faulty contact
81
The process of coating an oxide layer over a metal when anodic to give desirable decorative layer or for functional properties is called as
Answer
B. Anodising
82
The maximum thickness of Hard Anodising is
Answer
A. 40 Ī¼m to 60 Ī¼m
83
The oxide layer which grows both at aluminium/oxide interface and oxide/electrolyte interface is called as
Answer
D. Barrier anodising
84
The process of building aluminium oxide on the surface of Aluminium article using sulfuric acid bath is also known as
Answer
B. Type II Anodising
85
The most suitable mixture for Sulphuric Chromic acid bath operation is
Answer
A. 10% to 5%
86
Which process is used for colour eļ¬ect on the unsealed anodised coatings ?
Answer
A. Stopping oļ¬
87
Anodic coatings can be stripped out by immersing the articles in
Answer
D. All of the above
88
To develop soft pastel shades and deep colours without metallic lustre on the dyed ļ¬lms, the anodising applied is
Answer
D. Chromic acid
89
The white powdery "bloom" on the surface of the articles anodised in sulfuric acid is due to
Answer
C. Too high temperature or current density
90
The correct method of sealing the anodised articles is
Answer
A. Nickel Acetate Solution
91
The test used to evaluate the corrosion resistance using a paste of cupric nitrate, ferric chloride, ammonium chloride and Kaolin on the electroplated articles is
Answer
A. Corrodkote Test
92
BNF Jest test method is used for measuring ________ of plating of the articles.
Answer
C. Thickness
93
The test developed for corrosion testing of zinc and cadmium coatings on steel is
Answer
B. Salt spray test
94
The Anodic coating on Aluminium is tested by
Answer
A. Eddy current method
95
The most common method of testing the plating parts by its appearance, lustre, colour, surface defects ļ¬nding is done by
Answer
D. Visual Inspection method
96
The method to ļ¬nd the discontinuities, cracks and voids on the electroplated articles is called as
Answer
A. Porosity test method
97
In salt spray test, the job is exposed to a mist of _________
Answer
B. Sodium chloride
98
A quick pass/fail test to determine the adhesion of a coating is done by
Answer
B. Cross-cut test
99
What is the standard adhesion test for coating ?
Answer
C. Pull oļ¬ adhesion test
100
The common causes of porosity in coating parts is due to
Answer
D. All of the above
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