ITI Machinist 1st Semester Exam Papers : The diploma of Machinist Theory is of 1 year in which there are 2 semesters, so in today’s post you have been given the paper of 1st semester and very important questions have been given in it which have been asked many times in the exam, so these questions are very important for all the students preparing for the Machinist Theory exam, do them carefully tomorrow and make your exam preparation better.
NCVT ITI Turner 1st Semester Question Paper
ITI Machinist 1st Semester Exam Papers
1. The arc distance measured from the pitch circle to its intercept along the same direction as the gear tooth is known as?
•Depth of gear tooth
•Thickness of gear tooth
•Pitch circle radius
•None of these
Ans. Thickness of gear tooth
2. In CNC system BLU is measured in……..
•Length unit
•Mass unit
•Time unit
•None of these
Answer. Length unit
3. In a helical gear the position of the gear tooth with respect to the shaft on which it is fitted is called ……..
• Inclined
• Perpendicular
• Parallel
• All of the above
Answer. Inclined
4. In CNC programming, part program is?
•Description of parts in the machine
•Maintenance schedule of the machine
•Set of commands to be followed by the machine tool
•Measurement of the surface finish of the workpiece
Answer. Set of commands to be followed by the machine tool
5. In incremental programming, location is always given as direction and distance from ……..
•Immediately preceding point
•Initial starting position as reference
•End point of the operation as reference
•All of the above
Answer. Immediately preceding point
6. G00 means?
•Slow traverse
•Circular projection
•Return to reference point
•Fast traverse
Answer. Fast traverse
7. If the distance covered by the table is 400 mm and 5 cuts are taken at a feed of 25 mm per minute, then, the machining time in minutes is?
•40 minutes
•60 minutes
•80 minutes
•100 minutes
Answer. 80 minutes
8. The most commonly used tool materials for CNC machining are?
•Low carbon steel
•Medium carbon steel and high carbon steel
•Tool steel and high carbon steel
•High speed steel and cemented carbide steel
Answer. High speed steel and cemented carbide steel
9. According to BIS the rough grades are designated as…….
•N1 to N12
•N1 to N20
•N1 to N15
•N1 to N9
Answer. N1 to N12
10. In order to achieve helical milling, the warm spindle of the driving head is geared to…..
•Lead screw of the machine table
•Milling cutter
•Both (a) and (b)
•None of these
Ans. Lead screw of the machine table
11. For which of the following operations is a canned cycle used?
•Drilling
•Boring
•Tapping
•All of the above
Answer. All of the above
12. On a CNC machine tool the most obvious information that is returned to the control is…
•Only the position of the table
•Velocity of the motor
•Both (a) and (b)
•None of the above
Answer: Both (a) and (b)
13. If the feed per tooth of a milling cutter is 40 mm and rotates at 240 c.p.m., then the feed per revolution will be?
•160 mm
•320 mm
•420 mm
•640 mm
Answer. 320 mm
14. Coordinate systems generally followed in CNC program are?
•Cartesian coordinate system
•Spherical coordinate system
•Cylindrical coordinate system
•None of these
Answer. Cartesian coordinate system
15. In spiral milling, if the index crank is rotated 40 revolutions, then the lead of the machine is equal to …. …
•10 times the lead of the table feed screw
•20 times the lead of the table feed screw
•30 times the lead of the table feed screw
•40 times the lead of the table feed screw
Answer. 40 times the lead of the table feed screw
16. The spindle on the clockwise direction is designated as …..
•M01
•M03
•M00
•M04
Answer. M03
17. The CNC machine driver (DC motor) and a feedback devices are connected by ….
•Guide-way
•Floppy disk
•Work-piece
•Lead screw
Answer. Lead screw
18. The geometry of worm wheel is similar to ….?
•Spur gear
•Bevel gear
•Helical gear
•All of the above
Answer. Helical gear
19. The steering mechanism of a car is made of………….?
•Cam and follower mechanism
•Rack and pinion mechanism
•Gear and pinion mechanism
•All of the above
Answer. Rack and pinion mechanism
20. Initial code is designated by the letter……?
•G
•M
•N
•T
Answer. G
21. Closed loop system uses?
•No sensor
•Internal sensor
•External sensor
•None of these
Answer: External sensor
22. The usual pitch for a helical gear is?
•Equal to the axial pitch
•Less than the axial pitch
•Greater than the axial pitch
•None of these
Answer. Less than axial pitch
23. The lead of a helical or spiral is defined as the distance covered by…
•Perpendicular to the axis of rotation
•Parallel to the axis of rotation
•Inclined to the axis of rotation
•None of these
Answer. Parallel to the axis of rotation
24. In CNC programming, APT stands for?
•Additional Part Technology
•Alternative Part Programming
•Automated Programming tools
•None of these
Answer. Automated Programming tools
25. A canned cycle can be accessed with a………
•Single block of code
•Block without code
•Block with maximum number of codes
•None of these
Answer. Single block of code
26. Tool compensation on the left side is designated by …….
•G43
•G40
•G41
•G42
Answer. G43
27. According to BIS surface roughness is evaluated based on …….?
•Center Line Average (CLA) method
•Envelope method
•Both (a) and (b)
•None of these
Answer. Both (a) and (b)
28. A milling cutter has a diameter of 70 mm which rotates at 500 c.p.m., the cutting speed in m/mm will be?
•110
•55
•30
•220
Answer. 110
29. Point-to-point systems are those which move the tool or workpiece?
•From one point to another and then the tool performs the work
•From one point to another in a circular path and then the work is performed
•From one point to another in a elliptical path
•None of these
Answer. From one point to another and then the tool performs the work
30. The purpose of rack and pinion mechanism is to?
•Convert rotary motion into linear motion
•Linear motion into rotary motion
•Both (a) and (b)
•None of these
Answer. converting rotary motion to linear motion
31. The main disadvantages of a CNC machine are?
•Relatively higher cost compared to manual versions
•More complex maintenance
•Requirement for skilled parts programmers
•All of the above
Answer. All of the above
32. The leads of the cam are?
•Falling of the cam in one revolution
•Rising of the cam in one revolution
•Rising or falling of the cam in one revolution
•None of these
Answer. Rising or falling of the cam in one revolution
33. The program codes of absolute position are?
•G20
•G60
•G90
•G91
Answer. G90
34. The main advantages of CNC machine, when compared with conventional machines, are?
•High accuracy
•Repeatability
•Safe
•All of the above
Answer. All of the above
35. The types of feedback systems in CNC are?
•Open loop system
•Closed loop system
•Both (a) and (b)
•None of the above
Answer. Both (a) and (b)
36. The main advantages of using coolant in milling operation are?
•Work distortion is minimized
•Higher cutting speeds are obtained
•Tool life is increased
•All of the above
Answer. All of the above
37. In case of helical milling cutter, when viewed from the end face, if the flutes move in a clockwise direction, then it is known as?
•Left hand helix
•Right hand helix
•Both (a) and (b)
•None of the above
Answer. Right hand helix
38. The component which stores the program and executes the commands in the operation by the machine tool is?
•Arithmetic logic unit
•Memory storage unit
•Machine control unit (MCU)
•Measurement unit
Answer. Machine Control Unit (MCU)
39. Which one of the following is measured during inspection of a bevel gear.
•Crown to back dimension
•Face cone position
•Face angle
•All of the above
Answer. All of the above
40. The types of gears used in hand drill are?
•Spur gear
•Worm gear
•Bevel gear
•Rack and pinion
Answer. Bevel gear
41. The follower motion in a cylindrical cam is?
•The cam moves or moves in a direction perpendicular to the axis
•The cam moves or moves in a direction parallel to the axis
•Both (a) and (b)
•None of the above
Answer. The cam moves or moves in a direction parallel to the axis
42. Cam milling is performed on……
•Horizontal milling machine
•Vertical milling machine
•Universal milling machine
•None of these
Answer. Universal milling machine
43. The main advantage of worm and worm wheel is?
•Higher gear ratio
•Less heat generation
•Lower gear ratio
•All of the above
Answer. Higher gear ratio
44. If a cam has a fall of 10mm in 100° of its angle, then the lead of the cam is?
•10 mm
•36 mm
•45 mm
•18 mm
Answer. 36 mm
45. The number of scales on a gear tooth vernier is?
•3
•4
•1
•2
Answer. 2
46. The main advantage of helical gears, when compared with spur gears, is?
•Less noise
•High speed transmission
•High capacity transmission
•All of the above
Answer. All of the above
47. In rack and pinion mechanism the rack tooth is in the shape of…?
•Trapezium
•Square
•Rectangle
•Circle
Answer. Trapezium
48. Tool change is designated by………?
•M01
•M05
•M06
•M09
Answer. M06
49. In a rack and pinion mechanism the diameter of a rack is?
•Equal to the diameter of the pinion
•Double the diameter of the pinion
•Three times the diameter of the pinion
•Infinite
Answer: Infinite
50. The parameters to be considered for gear blank inspection of bevel gears include?
•Size of gear blank
•Shape of gear blank
•Quality level expected
•All of the above
Answer. All of the above
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