| Post Name | Junior Instructor (Electroplater) |
|---|---|
| Department | Industrial Training |
| Question Paper Code | 114/2024/OL |
| Category Code | 669/2023 |
| Date of Test | 10 October 2024 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Which electrical quantity cannot be measured with a voltmeter ?
Answer
D. EMF
2
Which eļ¬ect of electrical current is applied in fan ?
Answer
B. magnetic
3
Which electrical quantity will be the same at any point of the series circuit ?
Answer
B. current
4
Which one is the source of ac supply ?
Answer
D. alternator
5
What is the value of conductance, if a wire has resistance of R Ī© ?
Answer
B. 1/R
6
What is the Quantity of electricity transferred by one ampere current in one second ?
Answer
C. one coulomb
7
Which material permit electrones to move through it easily ?
Answer
A. eureka
8
What is the eļ¬ect of the parallel circuit with one branch open ?
Answer
D. No current will ļ¬ow in that branch
9
How many electrons are there in the valance shell of the aluminium atom ?
Answer
C. 3
10
Ohm's law shows the relation between
Answer
B. current, voltage, resistance
11
Which of the following is not a homogenous mixture ?
Answer
B. Mixture of salt and sugar
12
The number of neutrons present in is
Answer
A. 6
13
Which of the following ions is isoelectronic with Oxide ion (OĀ²ā»)?
Answer
D. NĀ³ā»
14
Permutit used for the treatment of hard water is chemically called
Answer
B. Hydrated Sodium Aluminium Silicate
15
The pH value of 0.01 M KOH solution is
Answer
B. 12
16
The transition metal which is present in Vitamin B12 is
Answer
C. Cobalt
17
Bronze is an alloy of
Answer
D. Copper and Tin
18
According to Bohr Model, the expression for angular momentum of an electron in a given stationary state is
Answer
A. mvr = nh/(2Ļ)
19
Extraction of which of the following metals involves Bessemerisation
Answer
B. Cu
20
Example of a solution showing negative deviation from Raoult's law is
Answer
C. Acetone and Chloroform
21
Which of the following represents a practical application of electrolysis ?
Answer
D. Extracting hydrogen from water for fuel usage
22
What is the byproduct in a hydrogen-oxygen fuel cell combustion ?
Answer
C. Water
23
What happens when the opposing external applied potential to an electrochemical cell is greater than the cell potential
Answer
B. The electrochemical cell behaves like an electrolytic cell
24
Calculate the quantity of aluminium metal deposited by passing 1.5 faradays of electricity through an aqueous solution of
Answer
A. 13.5g
25
The electrolyte used in Leclanche cell
Answer
D. Moist paste of and
26
Pick out the weak electrolytes from the following i) ii) iii) iv)
Answer
D. ii and iv
27
The product formed at the cathode during the electrolysis of molten sodium chloride
Answer
B. Sodium metal
28
In a parallel arrangement, two batteries with EMFs of 2V and 1V and internal resistance of 1Ī© and 2Ī© respectively, are connected. What is the eļ¬ective EMF of the combination ?
Answer
C. 5/3V
29
Calculate the amount of charge ļ¬owing in 2 min in a wire of resistance 10Ī© when a potential diļ¬erence of 20V is applied between its ends
Answer
B. 240C
30
Energy change occurring in an electrolytic cell is
Answer
B. Electrical energy to chemical energy
31
Factors which aļ¬ecting the atmospheric corrosion i) Oxidising action of air. ii) Humidity condition and atmospheric pollution. iii) Salt in marine atmosphere.
Answer
C. All of the above (i, ii and iii)
32
The corrosion of metals can be eļ¬ectively resisted by i) Application of metallic coatings. ii) Application of acids. iii) Application of paints.
Answer
A. Only (i and iii)
33
A discontinuity in protective surface ļ¬lm
Answer
B. Pitting corrosion
34
Cracking of light alloys
Answer
C. Stress corrosion
35
The aluminium surface can be protected from corrosion by
Answer
D. Anodising
36
The corrosion caused by moving liquids
Answer
D. Erosion corrosion
37
The coating of zinc metal on iron surface for the protection from corrosion
Answer
B. Galvanising
38
In which corrosion a growth of crack formation in a corrosive environment on ferrous metal ?
Answer
C. Stress corrosion
39
Which of the following chemical used for the removal of corrosion in aluminium metal ?
Answer
A. Sodium hydroxide
40
Why aluminium oxide on the surface of aluminium useful for the aluminium metal ?
Answer
D. It protects further deterioration of the aluminium metal
41
Mild steel immersion heaters are used for heating electroplating solutions i) Cyanide solutions ii)Alkaline solutions iii) Phosphoric and chromic acid solutions
Answer
B. Only (i and ii)
42
Chroļ¬es are used to ļ¬oat the plating solution for i) Improve throwing power ii) Reduce spray iii) Prevent heat losses
Answer
C. Only (ii and iii)
43
In plating solution cooling purpose is required i) Operated at high current densities ii) Operated at high temperature iii) Operated at low temperature
Answer
B. Only (i and ii)
44
What is the reason for the proposal of air agitation units in plating bath ? i) Keep the solution well mixed ii) Prevent the production of rough or burnt deposit iii) Increase the metal content
Answer
B. Only (i and ii)
45
Where it is recommended to use ļ¬lter units to plating bath ? i) Roughness of deposit due to inclusion of suspended matters ii) Roughness of deposit due to high metallic content iii) Roughness of deposit due to high current density
Answer
A. Only (i)
46
The eļ¬ective method for the rapid drying of small plated components in bulk ? i) By the use of hot air oven ii) By the use of hot water iii) By the use of centrifugal dryer
Answer
D. Only (iii)
47
The advantages of horizontal immersed perforated plating barrels i) Easily provided with automatic loading and unloading facilities. ii) Easily taken from pre-plating, plating and post plating treatments. iii) Convenient for the plating of large quantity in bulk.
Answer
B. All of the above (i, ii and iii)
48
The equipment in which the abrasive particles are made to impinge on the surface to be cleaned by compressed air ?
Answer
D. Abrasive blast cleaning
49
Name of the cathode contact used in plating barrels consists of a length of heavy insulated ļ¬exible cable terminated with a steel cathode knob.
Answer
C. Danglers
50
Name of the instrument used to measure accurately the acidic or alkalinity of a solution
Answer
A. pH meter
51
Which solution is used for pickling of non-ferrous metals ?
Answer
B. Hydro ļ¬uoric acid solution
52
What is a buļ¬ng process ?
Answer
C. Mechanical cleaning
53
Which is the process included in the pre-treatment process ?
Answer
B. Degreasing and Pickling
54
What is the removal of maskant on the areas to be etched ?
Answer
A. Demasking
55
What is the mixture of concentrated nitric acid and same concentration of hydrochloric acid and is used for dissolving metals ?
Answer
C. Aqua regia
56
Which component is essential in an automatic barrel plating plant for holding the parts ?
Answer
C. Barrel
57
Which method provides quick and complete cleaning for parts to be plated or coated, saving time and ensure proper adhesion ?
Answer
D. Ultrasonic cleaning
58
Which one of the following is an organic chemical ?
Answer
B. Tri chloroethylene
59
What is the ļ¬rst step in a chemical cleaning cycle employed for heavily contaminated items ?
Answer
A. Solvent cleaning
60
Which is the process in which the abrasive particles are made to impinge on the surface to be cleaned by compressed air ?
Answer
C. Abrasive blast cleaning
61
Which chemical is used for wood's nickel strike process ?
Answer
A. Nickel Chloride and Hydro chloric acid
62
Which anodes are used for bright chromium plating ?
Answer
B. Antimony lead anode
63
Which under coating is to be done before gold plating ?
Answer
B. Nickel
64
Which process removes Zinc cadmium and copper contamination on the nickel bath ?
Answer
C. Plating oļ¬
65
Which type of plating involves the use of electrolytes containing copper cyanide and zinc cyanide ?
Answer
D. Brass plating
66
Which is the Latin word from which the symbol of Tin (Sn) is derived ?
Answer
B. Stannum
67
What are the chemical contains in electrolyte used for bright nickel plating ?
Answer
B. Nickel sulphate, Nickel chloride, Boric acid
68
Which is used as the main electrolytic ingredient in Trivalent chromium plating ?
Answer
A. Chromium Sulphate
69
Which is the cathode eļ¬ciency of alkaline Tin plating solution ?
Answer
Question Cancelled
70
Which plating can be used in food packages ?
Answer
B. Tin plating
71
Which acid is silver not resistant to ?
Answer
B. Nitric acid
72
What is necessary to keep the plating solution well mixed inorder to prevent variation in concentration and temperature ?
Answer
A. Agitation
73
Which chemical should be added in cyanide copper plating bath if the pH is too low ?
Answer
C. Sodium Hydroxide
74
What is the possible cause for the deposited blistered or stripping from the basis metal while doing bright chromium plating ?
Answer
B. Poor adhesion of the undercoat nickel deposit
75
What is the possible cause of hard and dull deposit in silver plating ?
Answer
A. Too low current density
76
Which process is used for preventing discolouration after cadmium plating ?
Answer
C. Passivation
77
Which solution is used to test for porosity of cadimum and zinc coating ?
Answer
D. 1% volume of hydrochloric acid solution
78
Which defect occurs due to ineļ¬cient contacts of articles in bright chromium plating ?
Answer
B. Brown stains on deposit
79
Which is used in plating solutions as complexing agent particularly in gold and silver plating ?
Answer
B. Cyanide
80
What one of the following oļ¬ers excellent solderability, as well as superior protection against corrosion ?
Answer
D. Tin
81
What is the chemical formula of aluminum ?
Answer
A. Al
82
Which process is used to prevent corrosion of Aluminum ?
Answer
D. Anodising
83
The coating formed by anodising of aluminium by sulphuric acid process mainly consists of
Answer
B. Oxide of Aluminium
84
Anodising of the following metal is not possible ?
Answer
D. Iron
85
_______ is normally used for sealing of anodised Aluminium ?
Answer
C. Nickel Acetate
86
Which of the following solution is not suitable for anodising of aluminium ?
Answer
A. Hydrochloric Acid
87
In anodising of Aluminium, dye is used ______ ?
Answer
D. After anodising
88
For stripping of anodised ļ¬lm of aluminium, the following solution is used _____ ?
Answer
A. Chromic acid and phosphoric acid
89
Which process is followed for closing the pores in anodised ļ¬lms ?
Answer
C. Sealing
90
What is the process of applying colour to an anodised surface called ?
Answer
B. Dyeing
91
How will you increase the adhesion property of the base metal ?
Answer
A. By Pretreatment
92
Which one of the following property is tested using BNF test ?
Answer
B. Thickness of Electroplating deposit
93
Salt spray test is used to determine the _____ of the metalic surface ?
Answer
B. Corrosion resistance property
94
Tape Test is carried to measure the _____ of coating ?
Answer
C. Adhesion
95
Which type of measuring instrument from the following is used for measuring the thickness of deposit in the cylindrical job ?
Answer
A. Micrometer
96
Which method is used to measure the thickness of anodised ļ¬lm of aluminum ?
Answer
B. Eddy Current
97
The method used for determining the thickness of metallic coating by electro chemical stripping is known as ______ ?
Answer
D. Coulometric test
98
What is the use of salt spray test for plated article ?
Answer
D. Porosity
99
What is the common visual test used to determine cleanliness of the surface of parts ?
Answer
C. Water break test
100
Which corrosion resistance test is used to simulate the type of corrosion occure on Nickel Chromium coating ?
Answer
B. Corrodkote test
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