| Post Name | Junior Instructor (Mechanic Auto Body Painting) - Industrial Training |
|---|---|
| Question Paper Code | 092/2025/OL |
| Category Code | 320/2024 |
| Date of Test | 13 August 2025 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
About a standard general purpose outside micrometer, which one of the following is wrong statement?
Answer
D. Smallest measurement in the barrel scale is 1 mm
2
Least count of a English micrometer is
Answer
C. 0.001 inch
3
While checking the zero error of a micrometer, the thimble scale zero is in 3 division below the datum line. When reading with this micrometer, the reading get 23.33 mm. The actual reading is
Answer
B. 23.30 mm
4
In a vernier 1 main scale division is 1 mm and vernier scale have 20 divisions and it is equal to 19 main scale divisions. The least count of this vernier caliper is
Answer
A. 0.05 mm
5
While riveting, the tool used for support the head of the rivet which is already formed is
Answer
B. Dolly
6
Cutting angle of flat cold chisel for chipping copper is
Answer
B. 45°
7
A file is specified by its
Answer
D. Length, cut, shape and grade
8
The drilling machine that can be able to drill a number of holes in a work piece simultaneously is
Answer
B. Multiple spindle drilling machine
9
Name the headless screw used for prevent pulleys from slipping on a shaft
Answer
A. Set screw
10
Name the locking nut which has a slot cut half way across the nut and a screw is fitted with a clearance hole on top part and thread on lower part of the nut
Answer
C. Swan nut
11
The nucleus is the central part of the atom. It contains the protons and neutrons in ________ numbers
Answer
Question Cancelled
12
The product of power (P) and time (t) is called as
Answer
B. Electrical Energy
13
Wire wound resistors are manufactured by using
Answer
C. Nichrome
14
The difference of voltage and pressure across two points in a circuit is called
Answer
C. Potential difference
15
The property of a conductor which conducts the flow of current through it is called
Answer
D. Conductance
16
The product of true power and time is known as
Answer
B. Energy
17
Single phase energy can be measured by
Answer
D. Energy meter
18
Which type measuring instrument is no polarity marking on the terminals?
Answer
A. Moving iron
19
When the dynamometer instrument is to be converted as an ammeter to measure large currents, the moving coil is connected _________ both AC and DC
Answer
D. Across a shunt
20
When an ohm meter must not be connected to a circuit?
Answer
B. The circuit's power is on
21
Which of the following statement is/are correct about external combustion engines? i. The products of combustion of air and fuel transfer heat to a second fluid which is the working fluid of the cycle ii. Open cycle gas turbine is an external combustion engine.
Answer
A. only i
22
Which of the following statement is/are correct about internal combustion engines? i. Lesser requirement of water for dissipation of energy through cooling system ii. Closed type gas turbine is an internal combustion engine iii. Internal combustion engines are not self-starting
Answer
D. Only (i & iii)
23
Which of the following is not a criteria of classification of IC engines?
Answer
B. Firing order
24
Which of the following statement is/are correct about 2 stroke diesel engine? i. one power stroke is obtained in each revolution of crank shaft ii. 2 stroke diesel engines used in very large sizes for ship propulsion iii. In 2 stroke diesel engines there is no loss of fuel and no difficulty at idling.
Answer
D. all of the above (i, ii & iii)
25
Which of the following statement is/are correct about 4 stroke diesel engine? i. 4 stroke diesel engines have high compression ratio ii. In 4 stroke diesel engine heat supplied at constant volume iii In 4 stroke diesel engine compression ratio and expansion ratio are equal
Answer
A. only i
26
Which of the following statement is/are correct about 4 stroke engine? i. Turning movement is more uniform and hence lighter flywheel is used. ii. Thermal efficiency is lower iii. Volumetric efficiency is more
Answer
C. Only iii
27
Which of the following is not true in CI engines?
Answer
B. Quantity governing
28
Which of the following is not true is SI engines?
Answer
A. High cranking effort required
29
Which of the following statement is/are correct? i. The ratio of the volume of the cylinder between the BDC and the cylinder head to the clearance volume is the compression ratio ii. The volume of the cylinder in between the TDC and the cylinder head is the total volume iii. The volume of the cylinder in between the two dead centres is the swept volume
Answer
C. only (i & iii)
30
The cross-sectional area of one cylinder of an engine multiplied by its stroke is called
Answer
B. Swept volume
31
Which of the following statement is/are correct about an IC engine? i. The exhaust valve usually starts opening before BDC. ii. Valve overlap occures between exhaust and intake strokes
Answer
C. both (i & ii)
32
The ratio of energy in the indicated horse power to the fuel energy is known as
Answer
C. Indicated thermal efficiency
33
Which one of the following is not an advantage of unibody construction?
Answer
D. None of these
34
In which type of chassis engine is mounted completely inside the driver's cabin?
Answer
A. Full-forward control
35
Statement 1 : The compressor's intake filter removes particulate contaminants from incoming air before it is compressed into the tank. Statement 2 : The oiler in the service unit removes residual oil from the compressed air to provide oil-free air for painting and tyre inflation. Which one is correct?
Answer
B. Only statement 1 is correct
36
Which of the following pairs comprises only positive-displacement compressors?
Answer
A. Roots blower and Vane blower
37
Technician A : When both Roots blower and Vane type air compressors operate, back pressure develops on their respective outlet ports Technician B : The increase in pressure in Roots blower type air compressor is entirely due to back pressure. Who is correct?
Answer
C. Both are correct
38
Which is the correct statement on multistage air compressors compared to single stage ones? Statement 1 : High volumetric efficiency can be achieved Statement 2 : Smaller size flywheel can be used.
Answer
A. Both statements are correct
39
Technician A : Actual volume of air delivered by the compressor when reduced to the normal temperature and pressure condition is called Free air delivery Technician B : The capacity of an air compressor is generally given in terms of free air delivery
Answer
B. Both are correct
40
Which is the correct statement on mean effective pressure? Statement 1 : It can be calculated by dividing the work done by the compressor per cycle to the stroke volume. Statement 2 : It is the ratio of discharge pressure to the inlet pressure.
Answer
B. Only statement 1 is correct
41
A "differential" or "bias" regulator in an FRL assembly is specifically designed to
Answer
C. Sustain a fixed pressure difference between two points in the system
42
When selecting a regulator for precise control of pressures below 15-20 psi, the most appropriate choice is a
Answer
C. Low-pressure regulator
43
In a deliquescent dryer, which maintenance action is required periodically to ensure continued performance?
Answer
B. Draining the liquid solution and replenishing the hygroscopic medium
44
What is the main difference between primer and sealer?
Answer
B. Primer builds thickness, sealer improves adhesion and blocks stains
45
Why must primers and sealers be compatible with the topcoat?
Answer
C. to prevent peeling, cracking or poor adhesion
46
What is the main advantage of using polyurethane (PU) paint in automotive refinishing?
Answer
D. Excellent gloss and UV resistance
47
What are the major components of liquid paint?
Answer
B. Pigment, solvent, binder and additives
48
Why is wet sanding preferred in some repainting processes?
Answer
A. It reduces dust and gives a smoother finish
49
Which of the following is a key characteristic of a good-quality body filler?
Answer
C. Easy sanding
50
What is the main difference between body filler and glazing putty?
Answer
D. Glazing putty is used for minor surface imperfections, while body filler is used for filling deeper dents and shaping
51
What is the main base resin used in most automotive body fillers?
Answer
B. Polyester resin
52
Why must body filler be applied on a clean, sanded metal surface?
Answer
C. To ensure proper adhesion and prevent filler failure
53
What type of mask should be worn when spraying paint in a closed area?
Answer
D. Respirator with chemical filters
54
What should be done immediately after a small paint spill in the shop?
Answer
C. Absorb with inert material and ventilate the area
55
Which standard unit is used to measure the rate of corrosion of metals?
Answer
A. Millimetres per year (mmpy)
56
Which of the following factors does not cause corrosion?
Answer
D. None of these
57
Which of the following is not considered an anti-corrosion method?
Answer
C. Sanding the surface
58
Car requires repainting on 2 doors and the rear bumper. The cost per panel is Rs. 1,500 and the workshop adds a 10% overhead on the total? What is the total repainting cost including overhead?
Answer
A. Rs. 4,950
59
A job required 2 coats of paint. Each coat requires 0.8 litres per sq. meter. If the surface area is 3 sq. meters, how much paint is needed in total?
Answer
B. 4.8 litres
60
What is the main advantage of using HVLP spray guns in autobody repainting?
Answer
C. Reduces overspary and saves paint
61
What is the purpose of the fluid needle in a spray gun?
Answer
B. To open and close the fluid (paint) passage
62
Which spray gun is best suited for applying thick coatings like primers?
Answer
D. Pressure feed spray gun
63
What happens if the spray gun nozzle is clogged?
Answer
C. The spray becomes uneven or starts to sputter
64
Which type of spray gun is designed to create a vaccum and draw the material from the container?
Answer
C. Suction feed spray gun
65
What does a spray gun produce during operation?
Answer
B. Atomization and vaporization
66
Which of the following are the three main types of spray guns?
Answer
D. Suction feed, gravity feed, pressure feed
67
What is the primary advantage of an airless paint sprayer?
Answer
D. Delivers paint at high pressure without compressed air
68
Why is electrostatic painting not suitable for non-conductive surfaces like plastice or wood?
Answer
B. The surface cannot hold an electrical charge to attract paint
69
What type of filter is commonly used in spray booths for capturing overspray?
Answer
C. Dry particulate filters
70
Which booth type is typically used for painting large aircraft?
Answer
A. Cross draft booth
71
The base coat in a spray-painting process is responsible for
Answer
B. Giving colour and visual effects
72
What is the purpose of wet sanding during refinishing?
Answer
B. To reduce dust and smooth the surface
73
In refinishing, which spray gun is commonly used for base coat application?
Answer
C. HVLP spray gun
74
What is one advantage of using single stage paint over base coat/clear coat systems?
Answer
C. Faster application and fewer steps
75
Which of the following acids is commonly used in the pickling process?
Answer
B. Hydrochloric acid
76
Which of the following statements about Orbital Wire Brushing are correct? i. it is a mechanical power sanding system ii. it is used to remove rust, mill scale paint, and foreign matter iii. it is done manually without machines
Answer
A. only i and ii
77
Which of the following statements are correct about the phosphating process? i. Phosphating improves corrosion resistance of metals. ii. It enhances paint adhesion on the metal surface iii. It is only used for cleaning aluminum surfaces
Answer
B. only i and ii
78
Which of the following statements are correct about scrapers used in metal surface preparation? i. Scrapers are used to remove old paint, glue or adhesives from the metal surface ii. Scrapers are used for applying putty. iii. Scrapers and sharp blades help in removing layered materials from surfaces
Answer
B. only i and iii
79
What does a higher grit number indicate?
Answer
B. Smoother finish
80
Consider the following about grit size in sandpaper : i. Grit size refers to the size of abrasive particles ii. It is measured by the number of abrasive grains per square inch iii. Finer grit means coarser sanding
Answer
A. only i and ii
81
What is one key feature of dry sanding?
Answer
C. No liquid is required for lubrication
82
Which of the following statements about wet sanding is correct?
Answer
C. Water acts as a lubricant between the metal surface and sanding material
83
What should be done after applying masking paper and spraying liquid mask?
Answer
B. Fold masking paper back and wipe area
84
What should be done before any operation on a metal surface?
Answer
C. Ensure the surface is cleaned with compressed air and degreaser
85
Colour is a property of
Answer
C. Light
86
Which three colours are known as Primary Colours?
Answer
C. Red, Yellow, Blue
87
Which of the following is a secondary colour?
Answer
D. Green
88
What does 'Value' refer to in colour theory?
Answer
C. The lightness or darkness of a colour
89
The term "Saturation" in colour theory refers to
Answer
C. The purity or intensity of a colour
90
What is a "Tint"?
Answer
C. A colour mixed with white
91
What is the main cause of "orange peel" in automotive painting?
Answer
C. Improper spray gun adjustment or paint viscosity
92
"Runs" or "Curtains" in paint occur when :
Answer
B. Too much paint is applied in one area
93
What is the visual appearance of the defect called "sagging"?
Answer
B. Wavy or dripped-down paint surface
94
Which of the following causes sand scratch swelling?
Answer
B. Use of coarse sandpaper without proper sealing
95
What preventive measure helps avoid orange peel?
Answer
C. Correct spray gun setup and thinning ratio
96
Runs and sags in paint usually occur due to
Answer
D. Excessive film thickness and poor application technique
97
Which one of the following tools is commonly used to detect sagging immediately after spraying?
Answer
C. Inspection lamp/light
98
Sand scratch swelling appears when
Answer
B. The topcoat shrinks into the sanded areas below
99
What is the primary purpose of a rubbing compound?
Answer
C. To remove surface imperfections and scratches
100
Buffing is performed after rubbing compound to
Answer
B. Create a glossy and smooth finish
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