| Post Name | Junior Instructor in Plastic Processing Operator - Industrial Training |
|---|---|
| Question Paper Code | 129/2024/OL |
| Category Code | 647/2023 |
| Date of Test | 6 December 2024 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Don't use ties or scarves inside a work shop. The safety practice comes under
Answer
B. Personal safety
2
The term PPE, stands for, with respect to safety in an engineering industry
Answer
A. Personal Protective Equipment
3
Under which class of fire, gas and liquid gas are classified
Answer
C. Class C
4
Select from the following extinguishers, which is not suitable for electrical equipment ?
Answer
D. Foam extinguisher
5
If the belt of a drilling machine is positioned between smallest pulley on driver side and biggest pulley on driven side, the spindle speed will be
Answer
C. Minimum
6
The point angle of a punch which is used for locating center of holes and for providing good seating for starting a drill
Answer
D. 90°
7
Heat treatment process done on the face and peen of a hammer is
Answer
B. Case hardening
8
Which one of the following files have a safe edge
Answer
A. Hand file
9
Select from the following grade of a V block, which are more accurate and made of high quality steel
Answer
A. Grade A
10
The clamps provided with V blocks for holding cylindrical jobs
Answer
C. U clamp
11
The least count of a vernier bevel protractor is found by
Answer
D. 2msd-1vsd
12
The purpose of rake angle provided on a lathe side cutting tool is
Answer
B. To control the chip flow
13
The property of a good cutting tool material, which will avoid the breakage of cutting edge
Answer
A. Toughness
14
Find the number of teeth on a driver wheel required to cut a thread of 1.5 mm pitch, if the lathe have a lead screw of 5 mm lead and 100 teeth on driven side
Answer
C. 30 teeth
15
The most common method of producing threads on non-metal jobs are
Answer
B. Thread casting
16
What is the resistivity of mercury at 20° centigrade ?
Answer
A. 95.8×
17
What is resistance between ear to ear ?
Answer
B. About 100 ohms
18
What is the resistance of a conductor if whose diameter is reduced to half of its original diameter ?
Answer
C. Increase to 4 times
19
What is the temperature co-efficient of German silver at 20°C ?
Answer
D. 2.7 × 10⁻⁴
20
Which type of fuse used up to and including 63A ?
Answer
D. DZ type fuses
21
The first polymer made from synthetic material
Answer
C. PF resin
22
Hardness of Nylon is measured using
Answer
C. Rockwell Hardness tester
23
The trade name SARAN is related to
Answer
D. Vinylidene chloride copolymer
24
Which of the following polymer have lowest coefficient of friction ?
Answer
D. PTFE
25
Which of the following thermoplastic material is hygroscopic ?
Answer
B. Nylon
26
Which of the following features are true for Polycabonate ? a) Toughness upto 140° C b) Self extinguishing c) Very good resistance to chemicals and UV light d) Poor electrical insulation properties
Answer
A. Both a and b
27
What colour is obtained by the pyrolytic vapours of butyl rubber on the filter paper which is freshly soaked in a solution obtained by dissolving yellow mercuric oxide in conc. sulphuric acid and water on boiling ?
Answer
B. Bright yellow
28
The polymer which is used in the application of firelighters is
Answer
A. UF
29
The polymer which is produced by Cationic polymerization
Answer
B. Polyisobutylene
30
Which of the following statement is/are correct about impact strength ? i) Impact strength of polymer increases with increase in temperature. ii) Impact strength of polymer increases with increase in rate of loading. iii) Impact strength of polymer increases with decrease in degree of crystallisation.
Answer
B. i and iii
31
L/D ratio of screw of injection moulding screw is
Answer
Question Cancelled
32
Nozzle shutoff valve is not recommended for injection moulding of materials such as
Answer
B. PVC
33
Screws with compression ratio 3:1 to 5:1 are suitable for injection moulding of
Answer
C. Crystalline materials
34
Materials with very low melt viscosity can be moulded best with a nozzle known as
Answer
C. Reverse taper nozzle
35
Match the following P. Warping 1. Gates and runners are too restrictive Q. Sink marks 2. Metal section too cold R. Silver streaks 3. Part section uneven S. Crazing 4. Distortion due to internal stresses
Answer
B. P-4, Q-3, R-1, S-2
36
The part which is used between the end of the cylinder and the sprue bushing of an injection moulding machine is
Answer
A. Nozzle
37
Outer surface of the barrel is made of
Answer
C. Low carbon steel
38
Automatic removal of gates, runner and sprue at the time of moulding is achieved by
Answer
D. Three plate mould
39
Function of torpedo is i) Push the material towards metering end. ii) Spread the material. iii) Provide efficient heating of material.
Answer
C. ii and iii
40
Register ring is used to
Answer
A. Align the mould with machine platen
41
Semi positive-flash type mould is associated with which moulding process ?
Answer
A. Compression moulding
42
Catridge type electric heaters and hot oil system heating are used in which mould ?
Answer
D. Compression mould
43
A transfer mould with an in-built pot and plunger is known as
Answer
C. Integral mould
44
The form of the leftover material in the base of the well in transfer moulding is called
Answer
D. Cull
45
In compression moulding process the time interval between the opening and closing of mould for escape of volatile gases are called
Answer
C. Breathing time
46
In which type of compression moulding press, bigger and deeper components are made ?
Answer
B. Down stroking press
47
Which one of the following is not a part of Upstroking compression press ?
Answer
C. Nozzle
48
Transfer moulding is the modified form of which process ?
Answer
B. Compression moulding
49
What is the temperature range in compression moulding process ?
Answer
C. 140 to 250 ºC
50
What is the cause of 'Orange peel' defect in compression moulding ?
Answer
D. All of these
51
The parison die head is responsible for
Answer
C. Forming the hollow tube of plastic
52
The clamping unit in a blow moulding machine is used to
Answer
B. Hold the mould in position during blowing
53
Which of the following is a common technique used in parison programming to vary the thickness of the parison ?
Answer
A. Die gap adjustment
54
If you need to blow mould a lightweight, durable bottle for food packaging that has good resistance to impact and moisture, which material would be most suitable ?
Answer
D. Polyethylene Terephthalate (PET)
55
Uneven wall thickness in a blow-moulded part is usually caused by
Answer
B. Uneven parison thickness
56
In blow moulding pneumatic system, the compressor's main role is to
Answer
C. Increase air pressure
57
What is the primary purpose of using coinjection blow moulding in bottle production ?
Answer
B. To produce bottles with multiple layers
58
What does the hoop ratio measure in blow moulding ?
Answer
C. The ratio of the largest inside diameter of the blown article to the inside diameter of the preform
59
In which blow moulding process is the parison first moulded around a core ?
Answer
B. Injection blow moulding
60
Arrange the following materials in order of increasing orientation temperature
Answer
B. Polyethylene Terephthalate (PET) < Polyvinyl Chloride (PVC) < Polypropylene (PP) < Polystyrene (PS)
61
Which of the following correctly describes the stages of the injection blow moulding process in order ?
Answer
B. Injection moulding of preform → Preform inflation → Cooling and ejection
62
Identify the odd item from the following products
Answer
C. Plastic film for packaging
63
What is one method to reduce shrinkage in blow moulding ?
Answer
B. Increase blow time
64
Which of the following can cause burn marks on blow moulded products ?
Answer
B. High melt temperature
65
Which blow moulding process typically results in reduced thickness variation in the final container ?
Answer
B. Injection blow moulding
66
What role does the die play in the extrusion process ?
Answer
C. It shapes the extruded rubber
67
Which component of the extruder is responsible for conveying the rubber material through the machine ?
Answer
B. Screw
68
Which part of the extruder is responsible for applying pressure to the material ?
Answer
B. Screw
69
What type of die is commonly used in blown film extrusion ?
Answer
B. Annular die
70
What is the primary process used in cast film extrusion ?
Answer
B. Extruding molten polymer onto a chill roll
71
What role does the feed section of an extruder play ?
Answer
B. To melt the polymer
72
Monofilament extrusion is commonly used to produce
Answer
B. Ropes and nets
73
How does increasing the L/D ratio affect the thermal efficiency of an extruder ?
Answer
A. Increases thermal efficiency
74
In what type of applications might a lower L/D ratio be preferred ?
Answer
A. High viscosity materials
75
Which of the following factors primarily affects the final thickness of a calendared film ?
Answer
B. Roll gap
76
What might cause die swell during the extrusion process ?
Answer
B. High shear rates
77
What is a possible cause of low output rate in an extrusion process ?
Answer
B. High back pressure
78
What should be checked if screw jamming occurs in an extruder ?
Answer
B. Foreign materials in the feed
79
What is a common problem caused by high shear rates during the extrusion process ?
Answer
C. Degradation of material properties
80
What is the effect of increasing the temperature during the calendaring process ?
Answer
B. Increased fluidity of the material
81
Most commonly used mould material for FRP processes are
Answer
D. GRP
82
Thickness of gel coat in FRP product is
Answer
B. 0.6mm
83
Mechanical strength can be increased for any given laminate thickness by
Answer
D. Increasing the reinforcement to resin ratio
84
Thermosetting resin fully cured with best chemical resistance is from
Answer
C. Furane resin
85
Which reinforcement has more strength ?
Answer
C. Unidirectional rovings
86
Ability of plastic to become rubbery when heated and formed part will fit tightly around the mould is
Answer
B. Plastic Memory
87
Materials which loose their strength when heated and become soft and putty like have
Answer
C. Low hot strength and hot elongation
88
Selective heating to prevent heat from reaching a particular area can be done in forming processes using
Answer
D. Infrared heaters
89
A heated sheet is introduced between two tools and then pressed to desired shape. This forming method is called
Answer
D. Matched tool forming
90
Draft angle of female mould in thermoforming will be
Answer
A. 2-3 degree
91
The physical properties of rotational moulded parts differ from injection molded parts due to
Answer
C. Long thermal cycles
92
Rotational velocity in rotational molding is
Answer
C. 4 to 20 rpm
93
Wall thickness of product in rotational moulding can be changed by I) Adjusting amount of charge II) Increasing temperature III) Adjusting cycle time IV) Decreasing temperature
Answer
B. I and III
94
Rotational ratio for symmetrically shaped objects in rotational moulding is
Answer
B. 4 : 1
95
Raw material used for rotational moulding mostly comes from which family of polymers.
Answer
D. Polyethylene
96
Which product given below is not manufactured by rotational moulding process ?
Answer
A. Blood collection test tubes
97
Advantages of rotational moulding process are I) Less tooling II) Can be used for short runs III) Less down time of mould IV) All of the above
Answer
B. I and II
98
Which statement is correct about Rotational moulding Equipment ?
Answer
B. Low cost than injection moulding process
99
Moulds for making intricate shaped rotational moulded products are
Answer
D. Cast aluminium moulds
100
Common challenges encountered during the cooling phase of Rotational moulding are
Answer
A. Warping and shrinkage
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