| Post Name | JUNIOR INSTRUCTOR (MACHINIST) (Industrial Training Department) |
|---|---|
| Question Paper Code | 008/2025 |
| Category Code | 663/2023 |
| Date of Test | 21 January 2025 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Which of the following is correct about PPE? i) PPE
Answer
D. Protective clothing and coverall
2
Which of the following statement is/are correct related to fire extinguishers? (i) The main distinguishing feature of dry powder extinguishers is fork-shaped nozzle. (ii) Foam extinguisher is used where electrical equipment is involved. (iii) Foam extinguishers are most suitable for flammable liquid fires and running liquid fires. (iv) Fire due to electrical equipment can be extinguished by cooling with water.
Answer
B. Only i & iii
3
Which of the following statement is/are true related to colour code of bins for waste segregation? i) Red is used for metal, blue is used for paper and yellow is used for food. ii) Yellow is used for paper, red is used for metal and green is used for glass. iii) Yellow is used for plastic, red is used for metal and green is used for food. iv) Yellow is used for plastic, red is used for metal and green is used for glass
Answer
C. Only iv
4
In ABC of first aid, ‘A’ denotes
Answer
D. Airway
5
Which fire extinguisher is filled with Carbon tetrachloride
Answer
C. TC) and Bromochlorodifluoromethane
6
How the fire extinguishers are functioned to stop fire?
Answer
A. Pull, Aim, Squeeze, Sweep
7
Which of the following is the correct sequence of 5S concept?
Answer
C. Sort, Set, Shine, Standardize, Sustain
8
Which of the following is correct about fire extinguisher? i) Class 'A'
Answer
D. Oil based fire (grease, oil etc)
9
What is the shape of warning signs?
Answer
C. Triangular
10
Which of the following statement is/are true related to first aid? i) Place a pillow under the head of an unconscious person. ii) Give an unconscious person any food or drink. iii) Splash water on the face of an unconscious person to revive him. iv) Do not leave the unconscious person alone.
Answer
A. Only iv
11
One micron is equal to ______
Answer
C. 0.001 mm
12
Which marking media give very clear lines but take more time for drying than the other marking media?
Answer
B. Prussian blue
13
Which caliper has one leg with adjustable divider point while the other leg is a bent leg?
Answer
D. Jenny caliper
14
Which among the following is NOT a part of the divider?
Answer
A. Cork
15
Which punch gives wide and not very deep punching mark?
Answer
B. Centre punch
16
______ hammers are used for general work in a machine/fitting shop.
Answer
C. Ball pein hammer
17
Which among the following is NOT a use of try square?
Answer
A. Measuring 90°
18
The protractor head is used for marking and measuring angles with an accuracy of _____ degree.
Answer
D. 1°
19
Surface plates used for machine shop works are available ______ grades.
Answer
C. Grades 1, 2 and
20
Which parallel block is used for general machine shop work?
Answer
B. Grade B
21
Which are the correct statements in the case of screw thread micrometer? i) It is a measuring instrument and accuracy of this instrument is 0.001 mm ii) It is a measuring instrument and accuracy of this instrument is 0.01 mm iii) Screw thread micrometer is an instrument used for measuring pitch diameter of screw thread iv) Screw thread micrometer is an instrument used for machining and ensure the profile of screw thread
Answer
B. ii & iii
22
Name the Vernier height gauge part shown in figure.
Answer
C. Base
23
Which are the correct statements in the case of inside micrometer? i) The circumference of the bevel edge of the thimble is graduated into 50 divisions. ii) The circumference of the bevel edge of the thimble is graduated into 25 divisions. iii) In one complete turn of thimble, it moves forward or backward by one thread pitch of 0.5 mm. iv) In one complete turn of thimble, it moves forward or backward by one thread pitch of 0.01 mm
Answer
D. i & iii
24
The accuracy of common type vernier caliper which is used for measuring turning surface is
Answer
A. 0.02 mm
25
Which are the statements applicable in the case of vernier bevel protractor? i) Bevel Protractor is an instrument which is used for measuring angle to an accuracy of 5 minutes ii) Dial of Bevel Protractor is an integrated part of stock iii) Bevel Protractor is an instrument which is used for measuring angle to an accuracy of 5 seconds iv) Dial of Bevel Protractor is an integrated part of Blade
Answer
A. i & ii
26
Name the part of vernier caliper which moves over the beam and can be set in any position by means of a spring-loaded thumb lever.
Answer
D. Vernier slide
27
The working principle of an instrument which states that two different scales are constructed on a single known length of a line and the difference between them is taken for fine measurements.
Answer
B. Vernier Caliper
28
In the vernier height gauge, finer adjusting slide has to be locked in position, for an approximate height as required. To get an exact markable height, the finer adjustments have to be carried on the slider with the help of
Answer
D. Finer adjusting nut
29
The other name of graduated sleeve of micrometer
Answer
B. Barrel
30
The instrument used to true and align machine tools, fixtures, to test and inspect the size & trueness of finished work to an accuracy of 0.01 mm is
Answer
C. Dial indicator
31
Among them which are the features of flexible hacksaw blades? i) The full length of the blade between the pins is hardened ii) The teeth of the blade are only hardened iii) Flexible blades should be thinner than all hard blades iv) Flexible blades are used for sawing harder metals such as tool steel, die steel
Answer
B. ii & iii
32
Among them which are the features of double cut files? i) The first row of teeth is known as OVERCUT and the teeth are cut at an angle of 51° ii) The first row of teeth is known as UPCUT and the teeth are cut at an angle of 70° iii) The first row of teeth is known as OVERCUT and the teeth are cut at an angle of 70° iv) A double cut file has two rows of teeth cut diagonal to each other
Answer
C. iii & iv
33
Name of the file shown in the picture is
Answer
A. Raspcut file
34
While filing of soft metal, the file teeth to become clogged with metal particle is known as
Answer
C. Pinning of file
35
Which are the correct statements in the case of hand files? i) These files, edges along the width, are parallel throughout the length ii) These type files, one edge is single cut whereas the other is safe edge iii) The edges along the width of these files are parallel up to two-thirds of the length iv) These type files faces are double cut and the edges are single cut
Answer
A. i & ii
36
In ISO Metric Thread, minor diameter of drill hole is
Answer
D. Major diameter – 2 × depth of thread
37
In the case of crosscut chisel, the length of the chisel varies from 100 to 400 mm and its width of the cutting edge varies from _____
Answer
B. 4 to 12 mm
38
While rough reaming operations are carried out by using the reamer, reamers are supposed to remove minimum amount of metal from _____
Answer
A. 0.1 to 0.15 mm
39
In terms of maintenance, OEE stands for
Answer
C. Overall Equipment Effectiveness
40
Which following document gives a graphical representation of the activity performed during manufacturing?
Answer
B. Process chart
41
Which lubricating method is known as ring-oiling?
Answer
D. Splash lubrication
42
Which cutting fluid is preferred to steel alloys for threading?
Answer
D. Lard oil
43
What is the kinetic viscosity of servo system 68 oil at 40°C?
Answer
C. 64.72
44
Calculate the r.p.m. for a HSS drill 19 to cut mild steel.
Answer
B. 503
45
Which letter drill has the largest diameter?
Answer
B. Z
46
What is the diameter of 'R' letter drill?
Answer
A. 8.611 mm
47
Tumbler gear mechanism in a lathe machine is used for (i) Change the direction of rotation of spindle (ii) Change the direction of rotation of leadscrew (iii) Change the direction of rotation of feed shaft (iv) Change the direction of movement of carriage
Answer
C. Only (ii), (iii) & (iv)
48
Knurling is done on a workpiece to (i) Improve grip (ii) Increase the diameter slightly (iii) Enhance appearance
Answer
A. All of the above (i), (ii) & (iii)
49
What will happen if the tool is not clamped rigidly while facing?
Answer
B. Concave face
50
What is the name of the part marked 'X'?
Answer
C. Set over screw
51
What is the name of the angle marked 'X'?
Answer
A. Side rake angle
52
A workpiece of diameter 60 mm undergoing turning operation. During first cut, depth of cut given is 5 mm. For second cut RPM selected is 1000. What is the cutting speed of the second cut?
Answer
D. 157 m/min
53
A shaft of 800 mm length is to be turned for a taper of length 250 mm. Amount of taper is 1:100. The large diameter of taper is 50 mm, what is the small diameter of taper?
Answer
C. 47.5 mm
54
Find the change gears to cut a worm of 0.4 inch lead on a lathe having a lead screw of 4 TPI.
Answer
C. Driver teeth 80 driven teeth
55
What is the name of the centre shown in the fig?
Answer
D. Self driving live centre
56
Effective diameter of screw thread is measured by
Answer
A. Screw thread micrometer
57
While cutting thread using single-point tool in lathe, the tool is aligned with work by using
Answer
B. Centre gauge
58
How the British thread chasing dial differ from Metric thread chasing dial?
Answer
D. One worm wheel and one dial
59
Consider the following production operation of gear manufacturing 1. Milling with a form cutter 2. Rack type gear shaper (gear planer) 3. Rotary gear shaper (gear shaper) 4. Gear hobbing The correct sequence of these processes in increasing order of accuracy of convolute profile of the gear is 44.
Answer
B. 2, 3, 1,
60
Milling process to mill both sides of a workpiece together, two side milling cutters are mounted at the appropriate distance apart. This configuration is known as
Answer
D. straddle milling
61
A milling cutter having 8 teeth is rotating at 200 rpm. If the feed per tooth is 0.1, then the table speed in mm per minute is
Answer
B. 160
62
Internal gear may be produced by
Answer
C. Gear shaping with a pinion cutter
63
The table in a plain milling machine can be moved
Answer
D. All of these
64
Bulky workpieces with irregular shapes are held in the milling machine table using
Answer
C. T bolt and clamps
65
Collets are used to hold the milling cutter having ________ shank than the spindle taper.
Answer
B. Smaller
66
The cutter starts the cut from the machined surface and proceeds upwards and the job is fed in a direction opposite to that of cutter rotation.
Assertion (A): Internal gears are manufactured on a gear shaper.
Reason (R): Hobbing is not suitable for manufacturing internal gear.
Answer
B. Both (A) and (R) are true but (R) is not the correct explanation of (A)
67
To produce full depth spur gear by the Gear hobbing method, the number of teeth to be cut = 30, module = 3mm and pressure angle = 20°. The radial depth of cut to be employed should be equal to
Answer
D. 6.75mm
68
Consider the following statements: In Up milling process, 1. the cutter starts the cut from the machined surface and proceeds upwards 2. the cutter starts the cut from the top surface and proceeds downwards 3. the job is fed in a direction opposite to that of cutter rotation 4. the job is fed in the same direction as that of cutter rotation Which of these statements are correct?
Answer
A. 1 and
69
A milling cutter may have surfaces made of
Answer
D. Both (A) and (B)
70
Normally, the milling machine table is made up of
Answer
A. Cast iron
71
Choose the correct option by analysing the statements given below related to 'types of bonds and abrasive materials used in grinding wheel'.
Statements:
1. Emery, Corundum, Sandstone and Silicon carbide are natural abrasives.
2. Silicon carbide is used for grinding materials like brass, copper, aluminium.
3. Silicon carbide abrasive is represented by 'S'.
4. Vitrified bond is not adversely affected by water, acids and oils at ordinary temperature.
Answer
Question Cancelled
72
Which of the following statements is/are correct related to 'Structure of grinding wheels'?
Statements:
1. Structure indicates the amount of bond present between the individual abrasive grains of grinding wheels.
2. The structure of grinding wheel is specified by numbers and grinding wheels having numbers from 9 to 15 indicates dense structure.
3. A close structured wheel will not produce good surface finish when compared to open structured wheel.
4. A close structured wheel is used to finish the grinding of hard and brittle materials.
Answer
D. Statements 1 and 4 are correct
73
COLUMN-A contains 'different types of bonds used in grinding wheels'. COLUMN-B contains 'uses and indications of those bonds in COLUMN-A'. Choose the right option in which COLUMN-A and COLUMN-B are matched correctly.
COLUMN-A: 1. Oxychloride bond; 2. Resinoid bond; 3. Rubber bond; 4. Shellac bond.
COLUMN-B: a. Denoted by 'R'; b. Denoted by 'E'; c. Bond is for making segmented type grinding wheels; d. Denoted by 'B'.
Answer
C. 1-c, 2-d, 3-a, 4-b
74
The specification of a grinding wheel is given as "51 A 36 L 5 V 23". Analyse the statements given below and choose the correct option Statements 1. 'A' indicates the types of bonds 2. '36' indicates the structure of wheel 3.'L' indicates the types of abrasive used in grinding wheel 4. 'V' indicates the grade of grinding wheel
Answer
D. All the statements are wrong
75
Which of the following abrasive material is most suitable for grinding cast iron material?
Answer
C. Silicon carbide
76
Which of the following statements related to 'dressing and truing of grinding wheels' is/are correct? Statements 1. When a new grinding wheel is mounted on the machine, it must be trued before use 2. Sometimes a grinding wheel is also trued to change the shape of the grinding wheel face 3. While grinding soft metals like aluminium, copper etc, the condition occurs when metal particles get clogged between abrasive particles of grinding wheel is called Glazing 4. Abrasive stick type dresser is used when only light dressing of grinding wheel is required ea
Answer
C. Statements 1, 2 and 4 are correct
77
Which shape of grinding wheel is used for gashing milling cutter teeth?
Answer
A. Saucer type
78
Which tool is accommodated with radius grinding attachment of tool and cutter grinder for forming radius on the grinding wheel?
Answer
D. Diamond stick
79
Find the cutting speed of grinding wheel in meter/second, if the spindle of the wheel is operated at 1000 RPM and the diameter of grinding wheel is 600mm.
Answer
B. 31.4
80
Choose the correct option by analysing the statements given below related to grinding. Statements 1. Flaring cup-shaped grinding wheel is used for sharpening milling cutters and reamers 2. When compared to dry grinding, wet grinding process will produce good surface finish 3. In a cylindrical grinder, the work material should be mounted in between centres only before starting (switching on) the hydraulic system 4. In a grinding machine, if the grinding wheel runs faster than the recommended speed, then there arises a chance of clogging of wheel
Answer
B. Statements 1, 2 and 4 are only correct |]
81
The NC/CNC control system in which several axes can be simultaneously controlled is known as
Answer
C. Contouring control system
82
In the 3-Dimensional Cartesian Coordinate system of CNC machine tools, Positive Z movement (+Z) is in the direction that
Answer
A. Increases the distance between the work piece and the tool
83
In accordance to the PLC program developed for a specific machine, the M Code used for Spindle on clock-wise rotation is
Answer
B. M03
84
A microcomputer that stores the program and executes the commands into actions by the machine tool is known as
Answer
D. Machine Control Unit
85
ATC in CNC means
Answer
A. Automatic Tool Changer
86
Drill chuck ada
Answer
C. Tool holding device
87
The G word in each block of a Part Program represents
Answer
B. Preparatory word
88
The CNC Code used to stock removal in turning for CNC Lathe is
Answer
A. G
89
In a CNC machine, a manual mode the allows the operator to move the axes and spindles of the machine is
Answer
D. JOG Mode
90
In CNC Lathe, the relationship between Feed rate per minute & Feed rate per revolution is
Answer
A. Feed per minute = Spindle Speed × Feed per revolution
91
The component of a CNC vertical machining centre that controls the servo motor movements by sending low energy commands is
Answer
A. MCU
92
In the continous path method of motion control system, which of the following interpolation method is not used?
Answer
B. Cylindrical
93
Identify the sensor/sensors used for safety monitoring of CNC machines. (i) Limit switches (ii) Photoelectric sensors (iii) Heat or smoke sensors (iv) Pressure sensors
Answer
D. All of the above
94
The primary rotary axes in a CNC are
Answer
D. A, B, C
95
A command mode or coordinate that has been set previously and can be optionally omitted from a programme statement is
Answer
D. null entry
96
G21 command represents
Answer
A. Metric values
97
Adding cobalt to high-speed steels increases
Answer
D. red hardness
98
Cutting tool wear caused due to ion exchange phenomenon between tool and workpiece causing oxidation and subsequent breakdown is
Answer
C. electrochemical wear
99
When plotted on a log-log graph, the relationship between tool life and cutting speed can be represented using a
Answer
A. straight line
100
With respect to a CNC in operation, what do you understand by the term "Jog"?
Answer
C. A normal movement of the CNC axis instituted by the operator
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