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Maharashtra HSC Multi-Skill General Engineering (NSQF) study materials
Maharashtra HSC Multi-Skill General Engineering (NSQF) study resources

Maharashtra HSC Multi-Skill General Engineering (NSQF) practice questions

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Question 1Engineering Workshop Practice and Safety

In a general engineering workshop, which personal protective equipment is most essential before starting any arc welding operation?

  1. Ear plugs and a wristwatch
  2. A dust mask and safety goggles
  3. A face shield with a filtered dark lens Correct answer.
  4. A cotton apron and open sandals

Explanation

Arc welding emits intense ultraviolet and infrared radiation plus flying spatter, so a welding helmet or face shield with an appropriate dark filter lens protects the eyes and face. Ordinary goggles or a dust mask do not block the radiation or resist hot spatter.

Question 2Engineering Workshop Practice and Safety

A hacksaw blade is mounted in the frame with the teeth pointing forward, away from the handle. What is the purpose of this orientation?

  1. It prevents the blade from overheating during the return stroke
  2. It reduces the number of teeth in contact with the workpiece
  3. It allows cutting on the forward stroke, when the operator can apply steady pressure Correct answer.
  4. It makes the blade reversible for left-handed operators

Explanation

Hacksaw teeth are cut so that they cut on the push stroke, allowing the operator to apply controlled force while the return stroke is light. Mounting the blade with teeth pointing forward therefore gives efficient cutting and longer blade life.

Question 3Engineering Workshop Practice and Safety

Which fire extinguisher type is suitable for a fire involving live electrical equipment in a workshop?

  1. Carbon dioxide extinguisher Correct answer.
  2. Foam extinguisher
  3. Water extinguisher
  4. Wet chemical extinguisher

Explanation

Carbon dioxide extinguishers are non-conductive and leave no residue, so they are suitable for electrical fires. Water, foam and wet chemical agents conduct electricity and can cause shock or worsen the fault.

Question 4Engineering Workshop Practice and Safety

Why is a centre punch used before drilling a hole in a metal plate?

  1. To enlarge the hole to the final diameter
  2. To create a small indentation that stops the drill from wandering Correct answer.
  3. To measure the depth of the hole
  4. To remove burrs from the drilled edge

Explanation

A centre punch mark gives the drill point a starting seat, preventing the bit from slipping away from the marked centre. It is a locating aid, not a sizing or finishing tool.

Question 5Engineering Workshop Practice and Safety

What is the main function of a bench vice in workshop practice?

  1. To hold a workpiece firmly during filing, sawing or chipping Correct answer.
  2. To cool the workpiece during machining
  3. To measure the length of a workpiece accurately
  4. To sharpen cutting tools

Explanation

A bench vice clamps the workpiece so that both hands can guide a file, saw or chisel safely and accurately. Measurement, cooling and sharpening are done with separate tools.

Question 6Engineering Workshop Practice and Safety

Which property of a material describes its ability to be drawn into thin wires without breaking?

  1. Hardness
  2. Brittleness
  3. Malleability
  4. Ductility Correct answer.

Explanation

Ductility is the capacity of a material to undergo plastic deformation in tension, allowing it to be drawn into wire. Malleability, by contrast, refers to deformation under compression into thin sheets.

Question 7Engineering Workshop Practice and Safety

What is the correct procedure when a person's clothing catches fire in the workshop?

  1. Run to the nearest exit to get away from the flames
  2. Wait for the fire alarm to sound before acting
  3. Stop the person, drop them to the ground and roll to smother the flames Correct answer.
  4. Pour water on the person immediately while they stand

Explanation

Stop, drop and roll smothers the flames and limits the burn area. Running supplies oxygen to the fire, and standing still while water is fetched allows the fire to grow.

Question 8Engineering Workshop Practice and Safety

Which tool is used to check the squareness of two adjacent machined faces of a workpiece?

  1. Divider
  2. Try square Correct answer.
  3. Outside micrometer
  4. Vernier caliper

Explanation

A try square has a stock and a blade set at exactly 90 degrees, so it reveals any gap when held against two faces. Calipers and micrometers measure distance, and dividers mark circles.

Question 9Engineering Workshop Practice and Safety

A workshop bench task requires filing a mild steel block flat. Which file is most suitable for removing metal quickly at the start of the job?

  1. A coarse double-cut flat file Correct answer.
  2. A fine single-cut flat file
  3. A triangular saw file
  4. A needle file

Explanation

A coarse double-cut file has large teeth and two cutting rows, so it removes metal rapidly for roughing. Fine files and needle files are for finishing and small work, and a triangular file is for corners and saw sharpening.

Question 10Engineering Workshop Practice and Safety

A drill bit in a pedestal drilling machine keeps overheating and its edges turn blue. What is the most likely cause?

  1. Excessive cutting speed with insufficient coolant Correct answer.
  2. The table height was set too low
  3. The workpiece is clamped too tightly
  4. The drill chuck is too small for the bit

Explanation

Blue discolouration indicates tempering from excessive heat, which comes from too high a spindle speed or poor cooling. Reducing speed and applying coolant restores normal cutting conditions.

Question 11Engineering Workshop Practice and Safety

Why is a clearance (relief) angle ground behind the cutting edge of a lathe tool?

  1. To allow the tool to be clamped in the holder
  2. To stop the tool rubbing against the workpiece below the cutting edge Correct answer.
  3. To increase the strength of the tool tip
  4. To help the chip curl and break

Explanation

Clearance angle provides space between the tool flank and the newly cut surface so the tool cuts rather than rubs. Rake angle, not clearance, controls chip flow, and the shank geometry handles clamping.

Question 12Engineering Workshop Practice and Safety

A fitter needs a hole of 10.00 mm nominal size with a close sliding fit on a shaft. Which measuring instrument gives the required precision?

  1. Try square
  2. Vernier caliper with 0.02 mm least count Correct answer.
  3. Steel rule graduated in 0.5 mm
  4. Inside caliper used by feel

Explanation

A vernier caliper with 0.02 mm least count can resolve dimensions to a level suitable for inspecting a close sliding fit. A steel rule and try square are too coarse or measure the wrong feature.

Question 13Engineering Workshop Practice and Safety

During gas welding, the flame shows a loud roar and a short, sharp blue inner cone separated from the tip. What does this indicate and what action is needed?

  1. A neutral flame; no adjustment is needed
  2. An oxidising flame; reduce oxygen flow or increase acetylene Correct answer.
  3. A backfire; close the cylinder valves at once
  4. A carburising flame; increase oxygen flow

Explanation

Excess oxygen produces an oxidising flame with a short inner cone and a hissing or roaring sound. The correct response is to reduce oxygen or increase acetylene until a neutral flame with a rounded cone is obtained.

Question 14Engineering Workshop Practice and Safety

Which safety practice applies when using a portable electric angle grinder?

  1. Remove the guard to reach tight corners
  2. Stand to the side of the disc plane and wear a full face shield Correct answer.
  3. Use the side of the disc for heavy stock removal
  4. Hold the workpiece by hand while grinding

Explanation

Standing out of the disc plane limits injury if the disc bursts, and a face shield protects against sparks and fragments. Guards must stay fitted, workpieces must be clamped, and side grinding is restricted on cutting discs.

Question 15Engineering Workshop Practice and Safety

A steel shaft is to be given a smooth finish with a hand file after rough machining. Which sequence gives the best result?

  1. Use a hacksaw, then a rough file
  2. Draw-file with a smooth file, then cross-file with a rough file
  3. Cross-file, then draw-file with a smooth file Correct answer.
  4. Use only a rough file throughout

Explanation

Cross-filing removes the machining marks and brings the surface level, and draw-filing with a smooth file then produces a fine, even finish. Reversing the order or using only coarse tools leaves deep scratches.

Question 16Engineering Workshop Practice and Safety

Which of these describes the correct use of a scriber in layout work?

  1. Use it as a centre punch to start a drill
  2. Draw light lines on a coated surface with the point tilted away from the rule edge Correct answer.
  3. Scratch heavily along a steel rule to make a deep groove
  4. Use it to lever a workpiece into position

Explanation

A scriber should be held with the point inclined and drawn lightly so it marks the layout without damaging the rule or weakening the workpiece. Heavy scratching and prying damage both the tool and the job.

Question 17Engineering Workshop Practice and Safety

A bench fitter is chipping a cast iron edge with a cold chisel. Which combination is safest and most effective?

  1. Goggles plus a chipping screen, with the chisel held firmly and struck away from the body Correct answer.
  2. Safety goggles alone, striking toward the fitter's hand
  3. A dust mask only, striking with a loose hammer head
  4. No eye protection because cast iron chips are heavy

Explanation

Chipping throws sharp chips, so goggles and a protective screen are both required, and the blow must be directed away from the operator. A loose hammer head is a serious hazard and must never be used.

Question 18Engineering Workshop Practice and Safety

Which statement correctly distinguishes a tap from a die?

  1. A tap cuts internal threads, while a die cuts external threads Correct answer.
  2. A tap cuts external threads, while a die cuts internal threads
  3. Both tools cut external threads but differ in pitch
  4. Both tools cut internal threads but differ in size

Explanation

Tapping produces a female thread inside a drilled hole, while threading with a die produces a male thread on a rod. The two operations are complementary but act on opposite surfaces.

Question 19Engineering Workshop Practice and Safety

Why is a taper provided on the end of a tap?

  1. To measure the depth of the thread
  2. To allow the tap to be turned with a spanner
  3. To let the tap enter and start cutting gradually in the drilled hole Correct answer.
  4. To make the tap harder than the workpiece

Explanation

The tapered lead on a tap distributes the cutting load over several teeth so the thread starts straight and the torque stays manageable. The square shank, not the taper, drives the tap.

Question 20Engineering Workshop Practice and Safety

A worker must lift a heavy machined block from the floor to a bench. Which technique follows correct manual handling practice?

  1. Hold the load at arm's length to keep it clear of the body
  2. Bend at the waist and lift with straight legs
  3. Bend the knees, keep the back straight and hold the load close to the body Correct answer.
  4. Twist the trunk while lifting to place the load quickly

Explanation

Bending the knees and keeping the load close uses the strong leg muscles and reduces the bending moment on the spine. Bending at the waist or twisting while loaded sharply raises the risk of back injury.

Question 21Engineering Workshop Practice and Safety

Which of these is the correct reason for using a lubricant while hand-tapping a thread in steel?

  1. It increases the cutting torque needed for the tap
  2. It reduces friction and heat and improves thread finish and tap life Correct answer.
  3. It replaces the need to back the tap out to clear chips
  4. It prevents the tap from cutting the thread

Explanation

Lubricant lowers friction between the tap and the workpiece, carries away heat and improves surface finish. It does not remove the need to reverse the tap periodically to break chips.

Question 22Engineering Workshop Practice and Safety

A surface plate is used in a fitting shop. What is its primary purpose?

  1. To provide a true flat reference surface for marking out and inspection Correct answer.
  2. To hold the workpiece during drilling
  3. To cool components after machining
  4. To support the workpiece during heavy hammering

Explanation

A surface plate is machined and finished to a high flatness so that heights, angles and straightness can be checked from a reliable datum. It is a reference, not an anvil or a fixture.

Question 23Engineering Workshop Practice and Safety

A hole is drilled slightly undersize and then reamed to final size. Why is reaming preferred over drilling alone for a close tolerance hole?

  1. Reaming removes a small amount of metal and corrects size, roundness and finish Correct answer.
  2. Reaming can be done with the same tool as drilling
  3. Reaming changes the position of the hole centre
  4. Reaming removes large amounts of metal quickly

Explanation

A reamer has multiple cutting edges and removes only a few hundredths of a millimetre, which improves diameter accuracy, roundness and surface finish without shifting the hole position. Drilling alone leaves an oversize or lobed hole.

Question 24Engineering Workshop Practice and Safety

A workshop uses a 230 V hand drill with a two-core cable and no earth connection. Why is this unsafe?

  1. The drill will run too slowly without an earth
  2. If the live conductor touches the metal body, the operator can receive a fatal shock Correct answer.
  3. The motor will overheat because current has no return path
  4. The cable will carry more current than it is rated for

Explanation

Without an earth, a fault that connects the live conductor to the metal casing leaves the casing at line potential, and touching it completes a circuit through the operator. Double insulation or a residual current device is required for such tools.

Question 25Engineering Workshop Practice and Safety

In a fitting job, a hole must be located within ±0.05 mm of a datum edge. Which method gives the required accuracy?

  1. Mark out with a steel rule and scriber only
  2. Eye estimation from the drawing dimensions
  3. Mark out with a height gauge on a surface plate, then centre-punch and drill Correct answer.
  4. Centre-punch by hand without any marking

Explanation

A height gauge on a surface plate transfers dimensions from a true datum with fine resolution, and the resulting punch mark guides the drill accurately. Rule-and-scriber marking or eye estimation cannot hold ±0.05 mm.

Question 26Engineering Workshop Practice and Safety

In an engineering workshop, which PPE item must be worn when handling a workpiece on a pedestal grinding machine to protect the eyes from flying abrasive particles?

  1. A cotton face mask covering the nose and mouth
  2. Ear plugs inserted before switching on the machine
  3. Safety goggles with impact-rated lenses Correct answer.
  4. A full-face welding shield with a dark filter

Explanation

Grinding throws high-velocity abrasive grit and metal particles, so the eyes need impact-rated eye protection such as safety goggles. A welding shield is meant for arc radiation, a cotton mask filters dust but leaves the eyes exposed, and ear plugs protect hearing only.

Question 27Engineering Workshop Practice and Safety

A fitter must mark the centre of a round mild steel bar before drilling it on a drilling machine. Which sequence of operations is correct?

  1. Prick punch a small mark, then centre punch it to open the hole for the drill point Correct answer.
  2. Scribe two crossing lines with a scriber, then drill without any punch mark
  3. Use a dot punch on the edge of the bar, then clamp it in the vice for drilling
  4. Centre punch directly on the surface, then scribe a circle around the punch mark

Explanation

A prick punch gives a fine initial location that can be checked and shifted before a heavier centre punch mark is made. The centre punch mark is then widened to guide the drill point and prevent it from wandering on the curved surface.

Question 28Engineering Workshop Practice and Safety

During a bench fitting job, a hacksaw blade is fitted with the teeth pointing towards the handle. What is the direct consequence when the operator cuts on the forward stroke?

  1. The blade cuts on the return stroke, so the forward stroke only rubs and the teeth dull quickly Correct answer.
  2. The set of the teeth closes up and the blade jams in the kerf
  3. The blade cuts normally because hacksaw teeth work equally well in either direction
  4. The frame bends because the tension screw is loaded in the wrong direction

Explanation

Hacksaw teeth are shaped to cut in one direction, and the blade is fitted so that cutting occurs on the forward stroke away from the handle. If the teeth face the handle, the forward push only rubs the teeth and the real cutting happens on the return stroke, so the blade dulls rapidly and progress is slow.

Question 29Engineering Workshop Practice and Safety

A fitter has to remove a broken tap from a blind tapped hole in an aluminium component without damaging the internal thread. Which approach is most appropriate?

  1. Heat the whole component to red heat with an oxy-acetylene torch and then unscrew the stub
  2. Use a tap extractor with prongs that engage the flutes, turning the stub out after applying penetrating oil Correct answer.
  3. Drive a hardened punch into the hole and hammer the broken tap deeper to loosen it
  4. Run a larger tap of the next size through the hole to cut away the broken piece

Explanation

A tap extractor engages the flutes of the broken tap so that torque can be applied to unscrew the stub without cutting the existing thread. Penetrating oil reduces friction, and working the stub gently back and forth helps free it. The other methods either destroy the thread or damage the component.

Question 30Engineering Workshop Practice and Safety

A pedestal drilling machine is being set up to drill a 20 mm hole in a heavy steel plate. Which combination of precautions is most important before switching on?

  1. Clamp the plate to the table, remove the chuck key, and set the spindle speed low for the large diameter Correct answer.
  2. Support the plate on wooden blocks, run the drill dry without coolant, and use a long feed lever
  3. Clamp the plate loosely, wear loose gloves, and feed the drill by pulling the spindle down sharply
  4. Hold the plate by hand, keep the chuck key in the chuck, and select the highest spindle speed

Explanation

A large drill in steel produces high torque, so the workpiece must be clamped to prevent it spinning, and the chuck key must be removed to avoid it being thrown out at start-up. Large diameters also need lower spindle speeds to keep cutting temperature and torque within safe limits.

Question 31Engineering Drawing and Graphics

In engineering drawing practice, which line type is used to show the hidden internal features of a machined component?

  1. Dashed line of short dashes Correct answer.
  2. Continuous thick line
  3. Continuous thin line
  4. Chain thin line

Explanation

Hidden edges and internal contours that are not directly visible are drawn with a dashed line made of short evenly spaced dashes. This convention lets the reader infer internal geometry without a section view. Continuous thick lines are reserved for visible outlines.

Question 32Engineering Drawing and Graphics

A drawing is prepared at a scale of 1:20. A finished part measures 150 mm on the drawing. What is the actual length of the part?

  1. 300 mm
  2. 3000 mm Correct answer.
  3. 1500 mm
  4. 7.5 mm

Explanation

A scale of 1:20 means one unit on the drawing represents twenty units on the object, so drawing size is multiplied by the denominator. Here 150 mm × 20 = 3000 mm, which equals 3 m. Reducing scales always enlarge the drawing value back to the real dimension.

Question 33Engineering Drawing and Graphics

Which drawing instrument is specifically designed to draw circles and arcs of small radius by adjusting a needle point and a lead point close together?

  1. French curve
  2. Bow compass Correct answer.
  3. Set square
  4. Protractor

Explanation

A bow compass has short legs and a spring or centre wheel that holds small radii firmly, so it is used for circles below about 25 mm. Set squares, French curves and protractors serve straight-line, irregular-curve and angular work respectively. The short rigid legs prevent the point from slipping at small settings.

Question 34Engineering Drawing and Graphics

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

  1. Above the front view
  2. To the left of the front view
  3. Below the front view Correct answer.
  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 top view falls below the front view and the left-side view falls on the right. This is the standard arrangement in Indian drawing practice. Third-angle projection reverses this placement.

Question 35Engineering Drawing and Graphics

Which type of sectional view is produced when the cutting plane passes fully through the object along a straight line?

  1. Full section Correct answer.
  2. Revolved section
  3. Removed section
  4. Offset section

Explanation

A full section results when a single straight cutting plane passes completely through the object, exposing the whole interior in one view. Offset sections use a stepped cutting plane, while revolved and removed sections show only a local cross-section of a feature such as a rib or spoke.

Question 36Engineering Drawing and Graphics

On an engineering drawing, the note 'Ø 24' placed against a circular hole indicates which dimension?

  1. Radius of 24 mm
  2. Circumference of 24 mm
  3. Diameter of 24 mm Correct answer.
  4. Depth of 24 mm

Explanation

The symbol Ø precedes a value to denote diameter, so Ø 24 means a diameter of 24 mm. Radius is indicated by R, and depth by the depth symbol or the word DEEP. Using the symbol avoids writing the word diameter on every circular feature.

Question 37Engineering Drawing and Graphics

Which projection is used for the isometric view of an object?

  1. Perspective projection
  2. Oblique projection
  3. Axonometric projection Correct answer.
  4. Orthographic projection

Explanation

Isometric drawing is a form of axonometric projection in which the three axes are equally inclined and foreshortened equally. It belongs to the parallel-projection family, so parallel edges stay parallel and do not converge. Perspective and oblique projections follow different construction rules.

Question 38Engineering Drawing and Graphics

Which pencil grade is most suitable for drawing the final visible outlines of an engineering drawing on drawing sheet?

  1. 2H Correct answer.
  2. 6B
  3. 2B
  4. HB

Explanation

Final outlines must be dark and sharp but must not smudge, so a harder grade such as 2H is used for inking-quality visible lines. Softer grades like HB or B are reserved for lettering and freehand work. Very soft grades smear easily and blunt quickly.

Question 39Engineering Drawing and Graphics

A hexagonal bolt head is to be drawn in plan. Which construction gives the corners of a regular hexagon inscribed in a circle of given diameter?

  1. Step off the radius six times around the circle Correct answer.
  2. Step off the diameter six times around the circle
  3. Bisect the circle with two diameters at 30°
  4. Divide the circle into eight equal parts

Explanation

The side of a regular hexagon equals the radius of its circumscribing circle, so stepping the radius around the circumference marks all six vertices. Joining these points gives the hexagon. Stepping the diameter would give only three points and cannot close a hexagon.

Question 40Engineering Drawing and Graphics

An ellipse has a major axis of 80 mm and a minor axis of 50 mm. Using the concentric-circle method, the construction begins by drawing two circles from the same centre. What are their diameters?

  1. 80 mm and 25 mm
  2. 80 mm and 50 mm Correct answer.
  3. 40 mm and 25 mm
  4. 160 mm and 100 mm

Explanation

The concentric-circle method draws one circle on the major axis as diameter and another on the minor axis as diameter, both from the ellipse centre. Hence the circles are 80 mm and 50 mm across. Radii of 40 mm and 25 mm describe the same circles but the question asks for diameters.

Question 41Engineering Drawing and Graphics

A line AB of true length 70 mm is inclined at 30° to the horizontal plane and lies parallel to the vertical plane. What is the length of its front view?

  1. 121 mm
  2. 70 mm Correct answer.
  3. 60.6 mm
  4. 35 mm

Explanation

A line parallel to the vertical plane shows its true length in the front view regardless of its inclination to the horizontal plane. The inclination affects only the top view, which is foreshortened. So the front view measures the full 70 mm.

Question 42Engineering Drawing and Graphics

In isometric drawing, what is the standard angle between the two receding axes and the horizontal?

  1. 30° Correct answer.
  2. 60°
  3. 90°
  4. 45°

Explanation

Isometric axes are drawn at 30° above the horizontal on both sides, with the vertical axis at 90°. This gives three equally spaced axes at 120° to each other. The 30° setting matches the equal foreshortening of the three principal directions.

Question 43Engineering Drawing and Graphics

A cube of 40 mm edge is drawn in isometric projection using the true isometric scale. What is the length of each edge along the isometric axes?

  1. 40 mm
  2. 28.3 mm
  3. 56.6 mm
  4. 32.7 mm Correct answer.

Explanation

In true isometric projection every edge is foreshortened by the factor 0.816, so 40 × 0.816 ≈ 32.7 mm. Isometric drawing, as opposed to isometric projection, would use the full 40 mm along the axes. The 0.816 factor comes from cos 35°16′.

Question 44Engineering Drawing and Graphics

A dimension value of 45 is to be placed on an inclined dimension line. Which practice is correct as per standard dimensioning rules?

  1. The text is placed above the dimension line and reads from the bottom or right-hand edge of the sheet Correct answer.
  2. The text is placed below the dimension line and reads upside down
  3. The text is broken by the dimension line and placed in the gap
  4. The text is always kept horizontal and never aligned with the line

Explanation

Aligned dimensioning places the value above the dimension line so that it reads from the bottom or the right-hand edge of the sheet. This keeps all values readable without turning the sheet. Unidirectional dimensioning, by contrast, keeps every text horizontal.

Question 45Engineering Drawing and Graphics

In third-angle projection, which view is placed on the left of the front view?

  1. Bottom view
  2. Top view
  3. Rear view
  4. Right-side view Correct answer.

Explanation

Third-angle projection places each view on the same side as the direction of observation, so the right-side view appears on the left of the front view. The top view appears above the front view. First-angle projection reverses this arrangement.

Question 46Engineering Drawing and Graphics

A drawing shows a circle in the top view and a rectangle in the front view. Which solid does this combination most likely represent?

  1. A sphere
  2. A triangular prism
  3. A cone
  4. A cylinder Correct answer.

Explanation

A right circular cylinder projects as a circle when viewed along its axis and as a rectangle when viewed perpendicular to its axis. A cone would show a triangle in the elevation, and a sphere would show circles in both views. The circle-rectangle pair is the standard signature of a cylinder.

Question 47Engineering Drawing and Graphics

In a drawing of a symmetrical stepped shaft, which line indicates the axis of symmetry?

  1. A continuous thin line with long dashes and two short dashes Correct answer.
  2. A continuous thin line
  3. A dashed line of short dashes
  4. A continuous thick line

Explanation

Centre lines and axes of symmetry are drawn with a chain thin line made of long dashes alternating with short dashes. This distinguishes the axis from visible outlines and hidden edges. It also serves to locate circles and pitch circles.

Question 48Engineering Drawing and Graphics

Which statement correctly describes the construction of a parabola by the rectangle method?

  1. The focus and directrix are used with a series of arcs
  2. The curve is drawn by rotating a line about a fixed point
  3. The rectangle is divided into an equal number of parts along its length and width, and corresponding points are joined Correct answer.
  4. A series of concentric circles are drawn from a common centre

Explanation

In the rectangle method a rectangle is drawn on the base and height, both sides are divided into the same number of equal parts, and corresponding division points are joined to give points on the parabola. It is a purely geometric construction that needs no focus or directrix. The focus-directrix method is a separate approach.

Question 49Engineering Drawing and Graphics

A point lies 30 mm above the horizontal plane and 20 mm in front of the vertical plane. In which quadrant is the point located?

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

Explanation

In the first quadrant a point lies above the horizontal plane and in front of the vertical plane. Both given distances are positive in the first-quadrant convention. Points above but behind the vertical plane lie in the second quadrant.

Question 50Engineering Drawing and Graphics

In an oblique projection of a rectangular block, the front face is drawn true shape and the receding edges are drawn at 45°. Which projection is this?

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

Explanation

Cavalier projection draws the receding axis at 45° and uses the full true length for depth, so the front face stays true shape. Cabinet projection also uses 45° but halves the depth to reduce distortion. Isometric and perspective do not keep the front face in true shape.