I85PREP
⌘ K
Assam ASSEB HS Skill Mechanical Engineering Technology study materials
Assam ASSEB HS Skill Mechanical Engineering Technology study resources

Assam ASSEB HS Skill Mechanical Engineering Technology practice questions

One question at a time. Build your Assam ASSEB HS Skill Mechanical Engineering Technology understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Engineering Drawing and CAD Fundamentals

In first-angle projection, where is the top view placed relative to the front view?

  1. To the left of the front view
  2. Below the front view Correct answer.
  3. Above the front view
  4. To the right of the front view

Explanation

In first-angle projection the object is imagined between the observer and the plane, so the view seen from above is projected onto the plane beneath the object. The top view therefore appears below the front view. This is the standard arrangement used in Indian drawing practice under SP:46 conventions.

Question 2Engineering Drawing and CAD Fundamentals

A line is inclined at 30° to the HP and lies parallel to the VP. How does its front view appear?

  1. A line perpendicular to XY
  2. A point
  3. A foreshortened line parallel to XY
  4. A true-length line inclined at 30° to XY Correct answer.

Explanation

When a line is parallel to the VP, its front view shows the true length and the true inclination to the HP. The inclination of 30° to HP is therefore seen directly in the front view against the XY line. The top view in such a case is a foreshortened line parallel to XY.

Question 3Engineering Drawing and CAD Fundamentals

Which conic section is generated when a plane cuts a right circular cone parallel to one of its generators?

  1. Parabola Correct answer.
  2. Hyperbola
  3. Circle
  4. Ellipse

Explanation

A section plane parallel to a generator cuts only one nappe of the cone and produces an open curve with eccentricity equal to one, which is the parabola. The section plane is inclined to the axis at exactly the semi-vertical angle. This is the defining condition for a parabolic section.

Question 4Engineering Drawing and CAD Fundamentals

In the isometric projection of a cube, what is the shape of each face as drawn?

  1. A parallelogram with 45° angles
  2. A square of true size
  3. A rhombus with 60° and 120° angles Correct answer.
  4. A rectangle in the ratio 2:1

Explanation

In isometric projection the three axes are equally inclined to the plane of projection, so each square face of the cube appears as a rhombus. The angles of this rhombus are 60° and 120°. All edges are foreshortened by the same factor of about 0.816.

Question 5Engineering Drawing and CAD Fundamentals

A hexagonal prism rests on the HP on one of its base edges. How many visible edges appear in the front view?

  1. Four Correct answer.
  2. Three
  3. Five
  4. Six

Explanation

When a hexagonal prism rests on a base edge, the axis is parallel to the VP and the front view shows the prism as a rectangle. The visible edges in this front view are the two vertical end edges and the two slanted base edges, giving four visible lines. The remaining edges are hidden or coincide with these.

Question 6Engineering Drawing and CAD Fundamentals

What does the abbreviation CAD stand for in engineering drawing practice?

  1. Computer-Assisted Dimensioning
  2. Calculated Architectural Drawing
  3. Computer-Aided Drafting only
  4. Computer-Aided Design Correct answer.

Explanation

CAD stands for Computer-Aided Design, covering the use of software to create, modify and analyse drawings and models. Drafting is one function within CAD but does not define the whole term. Modern CAD also includes solid modelling, simulation and data management.

Question 7Engineering Drawing and CAD Fundamentals

In a CAD system, what is the purpose of object snap (OSNAP)?

  1. To convert raster images into vector lines
  2. To lock the drawing file against editing
  3. To force the cursor to precise geometric points such as endpoints and midpoints Correct answer.
  4. To change the colour of selected objects

Explanation

Object snap constrains the cursor to exact geometric features such as endpoints, midpoints, centres and intersections. This ensures that entities meet precisely instead of being placed by eye. Accurate snapping is fundamental to producing dimensionally correct CAD drawings.

Question 8Engineering Drawing and CAD Fundamentals

A drawing is prepared to a scale of 1:50. A wall measures 120 mm on the drawing. What is its actual length?

  1. 2.4 m
  2. 6.0 m Correct answer.
  3. 60 m
  4. 0.6 m

Explanation

A scale of 1:50 means one unit on the drawing represents 50 units in reality. Multiplying 120 mm by 50 gives 6000 mm, which equals 6.0 m. Reducing scales are used when the object is too large to be drawn full size.

Question 9Engineering Drawing and CAD Fundamentals

Which line type is conventionally used for hidden outlines in an engineering drawing?

  1. Continuous thin wavy line
  2. Chain thin line with long dashes
  3. Short dashes of medium thickness Correct answer.
  4. Continuous thick line

Explanation

Hidden outlines are shown by short dashes of medium thickness, evenly spaced. This convention lets the reader distinguish concealed edges from visible ones. Continuous thick lines are reserved for visible outlines.

Question 10Engineering Drawing and CAD Fundamentals

In a CAD drawing, layers are primarily used to do which of the following?

  1. Convert dimensions into annotations automatically
  2. Increase the processing speed of the graphics card
  3. Group related entities so their visibility, colour and line type can be controlled together Correct answer.
  4. Store the drawing history for undo operations

Explanation

Layers organise entities by function, such as outlines, dimensions or centre lines. Properties like colour, line type and visibility are assigned per layer, so the whole group can be managed at once. This is a fundamental drafting discipline in CAD.

Question 11Engineering Drawing and CAD Fundamentals

A point is 30 mm above the HP and 20 mm in front of the VP. In which quadrant does it lie?

  1. First quadrant Correct answer.
  2. Fourth quadrant
  3. Second quadrant
  4. Third quadrant

Explanation

The first quadrant is the region above the HP and in front of the VP. A point 30 mm above HP and 20 mm in front of VP satisfies both conditions. Its front view lies above XY and its top view lies below XY.

Question 12Engineering Drawing and CAD Fundamentals

A straight line AB has its top view 60 mm long and its front view 45 mm long. The line is parallel to the HP. What is its true length?

  1. 75 mm
  2. 45 mm
  3. 105 mm
  4. 60 mm Correct answer.

Explanation

When a line is parallel to the HP, its top view shows the true length. The front view is then a foreshortened line parallel to XY. Since the top view is 60 mm, the true length of AB is 60 mm.

Question 13Engineering Drawing and CAD Fundamentals

Which development method is most suitable for a right circular cone?

  1. Triangulation method
  2. Parallel line method
  3. Approximate rectangle method
  4. Radial line method Correct answer.

Explanation

The radial line method develops surfaces that converge to an apex, such as cones and pyramids. The slant edge is treated as a radius and the base circumference is laid off along an arc. This gives the sector-shaped development of a cone.

Question 14Engineering Drawing and CAD Fundamentals

In orthographic projection, a plane perpendicular to the VP and inclined to the HP appears in the top view as which shape?

  1. A foreshortened line Correct answer.
  2. A circle
  3. A true-shape plane
  4. A point

Explanation

A plane inclined to the HP and perpendicular to the VP shows its edge in the top view, appearing as a foreshortened line. The true shape is not seen in either principal view unless the plane is parallel to a plane of projection. This edge view is the key step in the change-of-position method.

Question 15Engineering Drawing and CAD Fundamentals

What is the standard ratio of the length to the height of the title block on an A3 drawing sheet as per common Indian drawing sheet layout?

  1. It is a square block in the top-right corner
  2. It is placed centrally in the drawing area
  3. It occupies the full width of the sheet along the bottom edge Correct answer.
  4. It is a narrow strip along the left binding edge

Explanation

The standard sheet layout places the title block as a panel running along the bottom right, commonly across part or all of the bottom edge, carrying drawing number, scale, title and approvals. It is never placed in the middle of the drawing area. Consistent placement allows quick reference and reproduction.

Question 16Engineering Drawing and CAD Fundamentals

A cylindrical surface of diameter 50 mm and height 80 mm is to be developed. What is the developed width of the rectangle?

  1. 314 mm
  2. 80 mm
  3. 157 mm Correct answer.
  4. 100 mm

Explanation

The development of a cylinder is a rectangle whose width equals the circumference of the base circle. Circumference equals π times diameter, so π × 50 ≈ 157 mm. The height of the rectangle equals the cylinder height, 80 mm.

Question 17Engineering Drawing and CAD Fundamentals

Which of the following best describes an auxiliary view?

  1. A view projected on a plane inclined to the principal planes to show the true shape of an inclined surface Correct answer.
  2. A view drawn at the top of the sheet for reference
  3. A view produced by mirroring the front view
  4. A view that shows only hidden edges

Explanation

An auxiliary view uses an auxiliary plane inclined to the principal planes, usually parallel to an inclined face. This reveals the true shape and size of surfaces that appear foreshortened in the standard views. It is widely used for inclined faces and for circular features on slanted surfaces.

Question 18Engineering Drawing and CAD Fundamentals

In third-angle projection, where is the front view placed relative to the top view?

  1. Above the top view
  2. Below the top view Correct answer.
  3. To the left of the top view
  4. Overlapping the top view

Explanation

In third-angle projection the plane of projection lies between the observer and the object. The view from above is projected onto the top plane and appears above, so the front view sits below the top view. This arrangement is common in American and ISO-aligned practice.

Question 19Engineering Drawing and CAD Fundamentals

A 1:2.5 scale is to be constructed with a maximum readable length of 5 m. What should be the length of the scale on the drawing?

  1. 1250 mm
  2. 500 mm
  3. 2500 mm
  4. 2000 mm Correct answer.

Explanation

The scale length equals the maximum length divided by the representative fraction denominator. Here 5 m = 5000 mm, and 5000 ÷ 2.5 = 2000 mm. This gives the drawn scale length for a 1:2.5 reducing scale.

Question 20Engineering Drawing and CAD Fundamentals

Which pair of views is sufficient to fully describe a simple right circular cylinder standing on its base?

  1. A single isometric view
  2. Front view and side view
  3. Front view and top view Correct answer.
  4. Top view alone

Explanation

A cylinder standing on its base shows a rectangle in the front view and a circle in the top view. These two views together define its diameter and height completely. The side view would duplicate the front view and add no new information.

Question 21Engineering Drawing and CAD Fundamentals

In CAD, what does the trim command do to a selected entity?

  1. Cuts away the portion beyond a chosen cutting edge Correct answer.
  2. Joins two collinear lines into one
  3. Extends the entity to meet another entity
  4. Moves the entity by a specified displacement

Explanation

Trim removes the part of an entity that crosses a selected boundary or cutting edge. It is the counterpart of extend, which lengthens an entity to reach a boundary. Both commands rely on precise selection of the boundary edge.

Question 22Engineering Drawing and CAD Fundamentals

A square pyramid of base 40 mm rests on the HP with its axis vertical. In the top view, what is seen?

  1. A circle
  2. A triangle
  3. A square with both diagonals drawn as lines joining opposite corners Correct answer.
  4. A rectangle of 40 mm by 40 mm

Explanation

With a vertical axis, the top view of a square pyramid shows the true square base. The four slant edges converge at the apex, which projects at the centre, so the diagonals joining opposite corners are drawn. These diagonals represent the slant edges in the top view.

Question 23Engineering Drawing and CAD Fundamentals

A section plane is inclined to the HP and parallel to the VP. Which view shows the true shape of the section?

  1. The top view
  2. The side view
  3. The isometric view
  4. The front view Correct answer.

Explanation

A section plane parallel to the VP appears edge-on in the top view and true-shape in the front view. The cut surface is therefore seen in its true shape in the front view. This is the basis for drawing true-shape sections of solids.

Question 24Engineering Drawing and CAD Fundamentals

What is the main advantage of using a parametric CAD model over a manually drafted drawing?

  1. Dimensions and constraints drive the geometry, so edits update the model automatically Correct answer.
  2. It guarantees that the part can be manufactured without tolerances
  3. It eliminates the need for orthographic views
  4. It removes the need for any dimensioning on the drawing

Explanation

In parametric modelling, geometry is controlled by dimensions and constraints. Changing a driving dimension regenerates the model and any associated views, keeping the design consistent. This associative behaviour is the key benefit over manual drafting.

Question 25Engineering Drawing and CAD Fundamentals

An oblique projection is drawn with the front face true shape and receding edges at 45°. If receding edges are drawn at half scale, which projection results?

  1. Cavalier projection
  2. Isometric projection
  3. Cabinet projection Correct answer.
  4. Perspective projection

Explanation

Cabinet oblique projection uses receding edges drawn at half their true length, usually at 45°. Cavalier projection draws them at full length. The half-scale recession reduces the distorted appearance of depth.

Question 26Engineering Drawing and CAD Fundamentals

A drawing is prepared to a scale of 2:1. A component dimension measures 75 mm on the drawing. What is the actual length of the component?

  1. 75 mm
  2. 37.5 mm Correct answer.
  3. 150 mm
  4. 18.75 mm

Explanation

In a 2:1 scale the drawing is enlarged, so every drawn length is twice the true length. The actual size is therefore found by dividing the drawn measurement by the scale factor: 75 mm / 2 = 37.5 mm. Multiplying instead of dividing would apply the logic of a reducing scale such as 1:2.

Question 27Engineering Drawing and CAD Fundamentals

In a CAD drawing, which command is used to create a mirror image of a selected object about a chosen axis?

  1. Mirror Correct answer.
  2. Offset
  3. Array
  4. Rotate

Explanation

The mirror command reflects selected geometry about a line or axis defined by two points, producing a symmetrical copy that can be kept or deleted. It is the standard tool for drawing symmetrical parts once and reproducing the opposite half. Offset, array and rotate all transform geometry but none of them reflect it about an axis.

Question 28Engineering Drawing and CAD Fundamentals

A hexagonal prism of base 30 mm side and axis 70 mm long rests on the HP on one of its base corners, with its axis inclined at 30° to the HP and parallel to the VP. Which view shows the axis at its true inclination?

  1. The top view, because the axis is inclined to the HP
  2. Both views equally, since the axis is inclined
  3. Neither view, because the axis is not parallel to either plane
  4. The front view, because the axis is parallel to the VP Correct answer.

Explanation

When a line or axis is parallel to a reference plane, its projection on that plane shows its true length and true inclination. Here the axis is parallel to the VP, so the front view displays the 30° inclination correctly. The top view shows the axis foreshortened, since the inclination is measured against the HP.

Question 29Engineering Drawing and CAD Fundamentals

A cone of base diameter 60 mm and slant height 70 mm is developed. What is the approximate angle subtended at the apex by the development of its curved surface?

  1. 90°
  2. 154° Correct answer.
  3. 180°
  4. 206°

Explanation

The developed curved surface is a sector whose arc length equals the base circumference, π × 60 ≈ 188.5 mm, and whose radius equals the slant height, 70 mm. The sector angle is therefore (arc length / radius) in radians, 188.5 / 70 ≈ 2.69 rad, which converts to about 154°.

Question 30Engineering Drawing and CAD Fundamentals

A line AB has its top view 50 mm long and its front view 40 mm long. Both views are inclined to the XY line. Which statement about the true length of AB is correct?

  1. The true length equals the longer view, 50 mm
  2. The true length is less than 40 mm
  3. The true length cannot be found without the inclinations to both planes
  4. The true length is greater than 50 mm Correct answer.

Explanation

Each orthographic view is a foreshortened projection of the true length, so the true length is always at least as long as the longest view. Since both views are inclined to XY, neither shows the line in true length, and the true length must exceed 50 mm. It is obtained by the rotating line or auxiliary plane method, not by simply reading a view.

Question 31Workshop Practice and Manufacturing Processes

In a sheet-metal workshop, the hand shear used to cut straight lines in mild steel sheet is classified as which type of machine?

  1. Drawing press
  2. Shearing machine Correct answer.
  3. Rolling machine
  4. Punching press

Explanation

A shearing machine cuts sheet metal by applying a shearing force between two blades, producing a straight cut without removing chips. Rolling machines reduce thickness, while presses punch or draw shapes rather than making straight cuts.

Question 32Workshop Practice and Manufacturing Processes

A fitter needs to mark a circle of 40 mm diameter on a mild steel plate. Which tool is most appropriate for scribing the circle?

  1. Divider Correct answer.
  2. Centre punch
  3. Try square
  4. Vernier caliper

Explanation

A divider has two sharp legs and is set to the radius so that one leg acts as a centre and the other scribes the circle. A try square checks right angles, a centre punch marks a point for drilling, and a vernier caliper measures rather than scribes.

Question 33Workshop Practice and Manufacturing Processes

During filing, a file is described by its cut and its length. Which file cut is intended for removing metal rapidly in the initial roughing stage?

  1. Single cut
  2. Rasp cut
  3. Double cut Correct answer.
  4. Curved cut

Explanation

A double-cut file has two sets of teeth crossing each other, giving many cutting edges per stroke and fast metal removal for rough work. Single-cut files have parallel teeth and give a smoother finish, while rasps are for wood and soft materials.

Question 34Workshop Practice and Manufacturing Processes

In a drilling machine, which part supports the workpiece and can be raised or lowered on the column?

  1. Sleeve
  2. Drill chuck
  3. Spindle
  4. Table Correct answer.

Explanation

The table of a drilling machine carries the workpiece and can be moved up or down and clamped on the column at the required height. The spindle rotates the drill, the chuck grips it, and the sleeve is part of the drill-holding assembly.

Question 35Workshop Practice and Manufacturing Processes

A bench vice is mounted on a workbench so that the fixed jaw is set slightly proud of the bench edge. What is the main reason for this arrangement?

  1. To prevent the vice from rusting
  2. To allow long work to hang vertically without fouling the bench Correct answer.
  3. To allow the vice to be rotated freely
  4. To increase the clamping force of the vice

Explanation

Setting the fixed jaw just outside the bench edge lets long workpieces hang down past the bench face instead of striking it. This gives clearance for filing and sawing long stock and keeps the work square in the jaws.

Question 36Workshop Practice and Manufacturing Processes

Which property of a cutting-tool material allows it to keep a sharp edge even when heated during machining?

  1. Porosity
  2. Ductility
  3. Hot hardness Correct answer.
  4. Malleability

Explanation

Hot hardness is the ability of a tool material to retain hardness and edge sharpness at elevated temperature, which is essential for cutting tools. Malleability and ductility describe deformation behaviour, and porosity is a defect rather than a desirable tool property.

Question 37Workshop Practice and Manufacturing Processes

In a lathe, which operation is used to produce a smooth cylindrical surface by removing a small amount of metal from an already turned workpiece?

  1. Facing
  2. Finishing turn Correct answer.
  3. Knurling
  4. Parting off

Explanation

A finishing turn uses a light depth of cut and fine feed to improve the surface finish and bring the diameter to size. Facing produces a flat end, knurling forms a raised pattern, and parting off separates the work from the bar.

Question 38Workshop Practice and Manufacturing Processes

A hacksaw blade is marked 18 TPI. What does this designation indicate?

  1. The blade is 18 mm wide
  2. The blade can cut steel of 18 mm thickness
  3. The blade has 18 teeth per inch of length Correct answer.
  4. The blade is 18 inches long

Explanation

TPI stands for teeth per inch and states how many teeth occur in one inch of blade length. A lower TPI gives coarser teeth for thick sections, while a higher TPI gives finer teeth for thin walls and harder materials.

Question 39Workshop Practice and Manufacturing Processes

A workpiece must be held securely on a shaping machine table while its top surface is machined flat. Which clamping accessory is normally used?

  1. Face plate
  2. Machine vice with swivel base Correct answer.
  3. Three-jaw chuck
  4. Tool post

Explanation

A machine vice bolted to the shaping machine table grips the workpiece rigidly and its swivel base allows the work to be set at an angle. Chucks and face plates belong to lathes, and the tool post holds the tool rather than the work.

Question 40Workshop Practice and Manufacturing Processes

A taper of 1:20 is to be turned on a lathe using the compound rest. Which setting is required?

  1. Set the compound rest to the full included angle of the taper
  2. Set the tailstock offset to twice the taper ratio
  3. Set the compound rest to half the included angle of the taper Correct answer.
  4. Set the spindle speed to the highest available range

Explanation

When a taper is turned with the compound rest, the rest is swivelled to the half-angle of the taper because the tool travels along one side of the conical surface. Setting the full included angle would cut a taper of twice the required angle.

Question 41Workshop Practice and Manufacturing Processes

During drilling of a deep hole in mild steel, the drill becomes hot and squeals. Which action is the most appropriate corrective step?

  1. Remove the drill and continue with a larger drill
  2. Increase spindle speed to clear the chips
  3. Reduce cutting speed and apply adequate coolant Correct answer.
  4. Increase feed rate and stop using coolant

Explanation

Squealing and overheating indicate excessive cutting speed or inadequate cooling, so reducing speed and flooding the hole with coolant restores proper cutting conditions. Increasing speed or feed worsens the heat and accelerates drill wear.

Question 42Workshop Practice and Manufacturing Processes

A rectangular block is to be filed square. Which sequence of operations gives the best result?

  1. File all faces roughly, then check squareness at the end
  2. File only the edges and leave the faces as rolled
  3. File opposite faces first and ignore the reference face
  4. File one face flat, then file adjacent faces square to it in turn Correct answer.

Explanation

Filing begins by producing one truly flat reference face; each adjacent face is then filed square to this reference and checked with a try square. Working randomly or leaving faces unfinished cannot produce a square block.

Question 43Workshop Practice and Manufacturing Processes

In a lathe, a workpiece of 60 mm diameter is to be turned at a cutting speed of 30 m/min. Which spindle speed is closest to the correct value?

  1. 80 rpm
  2. 160 rpm Correct answer.
  3. 320 rpm
  4. 640 rpm

Explanation

Spindle speed N equals 1000 times cutting speed divided by pi times diameter, so N = 1000 x 30 / (3.14 x 60), which is about 159 rpm. The nearest listed value is therefore 160 rpm.

Question 44Workshop Practice and Manufacturing Processes

A hole is to be drilled and then finished to a precise size with a good surface finish. Which tool is used after drilling?

  1. Spot drill
  2. Tap
  3. Counterbore
  4. Reamer Correct answer.

Explanation

A reamer removes a small amount of material from a drilled hole to bring it to accurate size with a fine finish. A tap cuts internal threads, a counterbore enlarges the top of a hole for a bolt head, and a spot drill only starts a hole location.

Question 45Workshop Practice and Manufacturing Processes

In arc welding, what is the main function of the flux coating on a covered electrode?

  1. To increase the electrical conductivity of the core wire
  2. To shield the molten weld from atmospheric contamination and stabilise the arc Correct answer.
  3. To cool the weld pool rapidly after deposition
  4. To magnetise the workpiece during welding

Explanation

The flux coating burns to form a shielding gas and a slag layer that protect the molten metal from oxygen and nitrogen, and it also helps to stabilise the arc. It does not conduct current, cool the pool, or magnetise the work.

Question 46Workshop Practice and Manufacturing Processes

A butt joint is to be made in two 5 mm mild steel plates by gas welding. Which flame type is normally selected?

  1. Oxidising flame
  2. Carburising flame
  3. Long feathery flame
  4. Neutral flame Correct answer.

Explanation

A neutral flame with approximately equal oxygen and acetylene is used for mild steel because it neither adds carbon nor oxidises the metal. Oxidising and carburising flames are reserved for special cases such as brass or high-carbon steel.

Question 47Workshop Practice and Manufacturing Processes

In sand casting, what is the purpose of the riser?

  1. To provide a pouring basin for the ladle
  2. To feed molten metal to the casting as it solidifies Correct answer.
  3. To locate the pattern in the moulding box
  4. To allow gases to escape from the mould

Explanation

A riser is a reservoir of molten metal that feeds the casting during solidification, compensating for shrinkage. Gas escape is provided by vents, pattern location by dowels and pins, and pouring by the pouring basin and sprue.

Question 48Workshop Practice and Manufacturing Processes

A pattern is to be used for producing many identical castings in a moulding machine. Which pattern material gives the longest service life?

  1. Wax
  2. Plaster of Paris
  3. Metal Correct answer.
  4. Soft wood

Explanation

Metal patterns resist wear, moisture and handling damage, so they last for large production runs and give accurate repeated moulds. Wood wears quickly, wax is a expendable pattern for investment casting, and plaster is used for limited special work.

Question 49Workshop Practice and Manufacturing Processes

In a milling machine, which operation produces a flat surface at right angles to the spindle axis using the end of the cutter?

  1. Form milling
  2. End milling Correct answer.
  3. Slab milling
  4. Straddle milling

Explanation

End milling uses the end teeth and side teeth of an end mill to machine slots, pockets and flat surfaces perpendicular to the spindle. Slab milling uses the periphery of a cylindrical cutter, and straddle milling machines two parallel faces at once.

Question 50Workshop Practice and Manufacturing Processes

A machinist must produce an accurate internal thread in a blind hole in mild steel. Which tool and practice is correct?

  1. Use a taper tap alone to cut the full thread to the bottom
  2. Use a taper tap, then a plug or bottoming tap to reach the bottom Correct answer.
  3. Use a die to cut the internal thread
  4. Use a reamer to form the thread

Explanation

Internal threads in blind holes are cut by starting with a taper tap, which enters easily, and finishing with a plug or bottoming tap that cuts close to the hole bottom. A single taper tap cannot thread to the bottom, and dies and reamers do not cut internal threads.