Category: Manufacturing Engineering Objective Questions

Manufacturing Engineering Multiple Choice Questions on “Mechanical Properties”.

1. Resistance of a material against any external force is termed as _______________
a) Stiffness
b) Malleability
c) Strength
d) Hardness
Answer: c
Clarification: Strength is that mechanical property of a material by virtue of which it resists change in its dimension shape and any failure by application of any external force.

2. The property of a material to resist any elastic deformation is termed as ____________
a) Stiffness
b) Hardness
c) Malleability
d) Strength
Answer: a
Clarification: The ability of a material or shape to resist elastic deflection is termed as stiffness of that material.

3. Resistance developed by surface of any material is known as ____________
a) Strength
b) Hardness
c) Stiffness
d) Creep
Answer: b
Clarification: Hardness is a surface property. Resistance developed by surface of any material is known as hardness.

4. Permanent deformation of material with respect to time due to constant load and variable temperature is termed as ____________
a) Elasticity
b) Isotropy
c) Hardness
d) Creep
Answer: d
Clarification: Creep is time and temperature dependent phenomenon. With the passage of time and other environmental condition, material may lead to fracture point.

5. Material having same identical values a property in all directions can be termed as ____________
a) Creep
b) Anisotropy
c) Isotropy
d) Orthotropic
Answer: c
Clarification: Isotropic materials have the same property in all directions. Crystalline substance is isotropic in nature.

6. Property by virtue of which material can absorb strain energy without plastic deformation is called ____________
a) Creep
b) Anisotropy
c) Resilience
d) Fatigue
Answer: c
Clarification: Resilience is the strain energy absorbed of a material without undergoing a plastic deformation.

7. Which of the following hardness test uses steel ball as indenter?
a) Brinell hardness test
b) Rockwell C hardness test
c) Vickers hardness test
d) Rockwell B hardness test
Answer: a
Clarification: Steel ball is used as indentor in Brinell hardness test.

8. In which of the following test specimen is in the form of the simply supported beam?
a) Izod test
b) Rockwell hardness test
c) Charpy test
d) Brinell test
Answer: c
Clarification: In the Charpy test a supported beam specimen is used.

9. In which of the following test specimen is in the form of cantilever beam?
a) Izod test
b) Rockwell hardness test
c) Charpy test
d) Brinell test
Answer: a
Clarification: Izod test is like Charpy test, but the Izod geometry consists of a cantilever beam with the notch located on the same side as the impact point.

10. The total number of scales used in Rockwell hardness test is?
a) 12
b) 14
c) 15
d) 16
Answer: c
Clarification: There are 15 scales used in Rockwell hardness test, which are being differentiated based on indenter used and the material sampled.

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Manufacturing Engineering Multiple Choice Questions on “Tool Wear and Failure”.

1. Thermal cracking of tools occurs at
a) Low temperature
b) High temperature
c) Low cutting speed
d) None of the mentioned
Answer: b
Clarification: At high temperature tool may lose its hardness property which results in failure of tool and this phenomenon is known as thermal cracking.

2. Mechanical chipping may occur in which of the following tool?
a) Diamond tool
b) Mild Steel tool
c) HSS tool
d) None of the mentioned
Answer: a
Clarification: Mechanical chipping occurs in brittle tools. Here diamond is a brittle material.

3. With the passage of time, there is loss in weight of tool, this phenomenon is known as:
a) Thermal cracking
b) Mechanical chipping
c) Softening
d) Gradual Wear
Answer: d
Clarification: Loss of weight of tool with respect to time is known as gradual wear.

4. Crater wear occurs at
a) Tool flank
b) Tool shank
c) Tool face
d) None of the mentioned
Answer: c
Clarification: Tool face is weaker for crater wear than shank or flank.

5. Which of the following is correct about crater wear?
a) Occurs more in soft tool
b) Occurs more hard tool
c) Occurs more in brittle tool
d) None of the mentioned
Answer: a
Clarification: Crater wear occurs in soft tools because their face gets eroded easily during flow of chips over the face.

6. Flank wear occurs at
a) Tool flank below cutting edge
b) Tool shank
c) Tool face
d) None of the mentioned
Answer: a
Clarification: Tool flank are generally subjected to flank wear due to rubbing action of tool. Cutting edge may be side cutting edge or end cutting edge.

7. What is the maximum allowed value of VB in mm for HSS tool used with cast iron work piece for rough machining?
a) 0.5
b) 1
c) 1.5
d) 2
Answer: d
Clarification: VB denotes the of wear land. Maximum 2mm of wear land is allowed in flank wear.

8. What is the maximum allowed value of VB in mm for HSS tool used with cast steel work piece for rough machining?
a) 0.5
b) 1
c) 1.5
d) 2
Answer: b
Clarification: VB denotes the of wear land. Maximum 1mm of wear land is allowed in flank wear.

9. What is the maximum allowed value of VB in mm for carbide tool used with cast iron work piece for a cutting condition of feed>0.3mm/rev?
a) 0.5
b) 1
c) 1.5
d) 2
Answer: d
Clarification: VB denotes the of wear land. Maximum 1mm of wear land is allowed in flank wear.

10. What is the maximum allowed value of VB in mm for carbide tool used with steel work piece for a cutting condition of feed>0.3mm/rev?
a) 0.5
b) 1
c) 1.7
d) 2
Answer: c
Clarification: VB denotes the of wear land. Maximum 1.7mm of wear land is allowed in flank wear.

Manufacturing Engineering online quiz on “Lathe-4”.

1. What will be the length of job in m if diameter of big end is 100mm and diameter of small end is 60mm for a taper angle of 1.14 degree?
a) 5
b) 2
c) 7
d) 1
Answer: d
Clarification: Length be calculated by using- tan (half taper angle) = (D-d)/ (2*L) where ‘D’ is the external diamter, ‘d’ is the internal diameter, ‘L’ is the length of the job.

2. The job of total length 300mm is tapered turned on lathe using tailstock set over method. The two diameters obtained are 80mm and 500mm and length of taper was 200mm only. Tail stock set over is equal to
a) 10
b) 15
c) 20
d) 25
Answer: b
Clarification: Tail stock set over= L*(D-d)/ (2*l), where ‘D’ is the external diameter, ‘d’ is the internal diameter, ‘L’ is the length of job.

3. A job of total length 800mm is tapered turned on lathe using tailstock set over method. The two diameters obtained are 450mm and 500mm and length of taper was 700mm only. Tail stock set over is equal to
a) 10.12
b) 15.32
c) 20.32
d) 28.57
Answer: d
Clarification: Tail stock set over= L*(D-d)/ (2*l), where ‘D’ is the external diameter, ‘d’ is the internal diameter, ‘L’ is the length of job.

4. A cast iron piece of total length 100mm is needed to be tapered for a length of 40mm using swiveling the compound rest method. Diameter of job is 20mm and smaller end have nearly zero diameter. What should the angle in degrees by which compound rest should be rotated?
a) 20.36
b) 45.21
c) 14.03
d) 5.23
Answer: c
Clarification: tan (Angle of rotation of compound rest) = (D-d)/ (2*L), where ‘D’ is the external diameter, ‘d’ is the internal diameter, ‘L’ is the length of job.

5. Distance measured normal to the axis of part, between crest and root of thread is known as
a) Pitch
b) Depth of threads
c) Thread angle
d) Major diameter
Answer: b
Clarification: Depth of threads is the distance measured normal to the axis of a part, between crest and root of thread.

6. Distance from one point of thread to the next corresponding point is known as
a) Pitch
b) Depth of threads
c) Thread angle
d) Major diameter
Answer: b
Clarification: Pitch is the distance from one point of thread to the next corresponding point.

7. If the nut rotated in clockwise direction and advances axially, then threads present in nut are
a) Right Handed threaded
b) left handed thread
c) Right handed and left handed both
d) None of the mentioned
Answer: a
Clarification: In right handed thread nut rotated in clockwise direction and advances axially where as its reverse takes place in left handed threads.

8. Lead of nut is 2mm and has double start threads. What is the pitch of nut?
a) 1
b) 2
c) 3
d) 6
Answer: a
Clarification: Pitch=lead/number of starts.

9. A thread has number of starts equal to one. Which of the following is most correct about thread?
a) Pitch > lead
b) Pitch<c) Pitch < lead
d) Pitch=lead
Answer: d
Clarification: Pitch=lead/number of starts.

10. Let screw of 10mm pitch is needed to be cut on lathe machine. Lead screw of lathe has pitch of 6mm. Which of the following statement is correct?
a) Speed of lead screw is greater than speed of spindle
b) Speed of lead screw is less that speed of spindle
c) Speed of lead screw is equal to speed of spindle
d) None of the mentioned
Answer: a
Clarification: Speed of lead screw increase in relative to speed of spindle as many times the required pitch is smaller than pitch of lead screw.

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Manufacturing Engineering Multiple Choice Questions on “Drilling “.

1. Producing circular hole in a solid metal by means of revolving tool is known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Answer: a
Clarification: Drilling is defined as production of generally circular hole by using a revolving tool.

2. Operation of finishing previously drilled hole in order to bring it to accurate size and have good surface finish is known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Answer: b
Clarification: Reaming is a finishing operation of drilled hole. It is done to improve surface finish of drilled hole.

3. Process of enlarging the hole size and enhancing its surface finish is known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Answer: c
Clarification: Once the hole is drilled by using drilling operation, later the diameter of hole can be increased by using boring operation.

4. Process of enlarging only a small part of hole is also known as
a) Drilling
b) Reaming
c) Boring
d) Counter boring
Answer: d
Clarification: Once the hole is drilled by using drilling operation, later the diameter of some part of hole can be increased by using counter boring operation.

5. Operation of enlarging the end of the hole to give conical shape at end is known as
a) Drilling
b) Reaming
c) Boring
d) Counter sinking
Answer: d
Clarification: Once the hole is drilled by using drilling operation, later the ends of hole can be machined into conical shape for proper adjustment of washer or other machine parts by using Counter sinking operation.

6. Operation used to form internal threads is known as
a) Drilling
b) Reaming
c) Boring
d) Tapping
Answer: d
Clarification: Tapping is the process of forming internal threads by means of tool called tap.

7. If ‘D’ is hole diameter, then general value for a compulsory approach for through hole can be taken as
a) 0.3*D
b) 0.1*D
c) 0.5*D
d) 0.8*D
Answer: c
Clarification: For through hole, X = 0.5*D.

8. If ‘D’ is hole diameter, then general value for a compulsory approach for blind hole can be taken as
a) 0.3*D
b) 0.1*D
c) 0.5*D
d) 0.8*D
Answer: a
Clarification: For through hole, X = 0.3*D.

9. If 20mm hole is needed to be drilled using a drill having semi point angle of 15 degrees. Value of compulsory approach in mm is
a) 37.2
b) 45.3
c) 87.1
d) 13.3
Answer: a
Clarification: X = (D/2)/ (tan (semi point angle)).

10. If 20mm hole is needed to be drilled using a drill having point angle of 15 degrees. Value of compulsory approach in mm is
a) 37.2
b) 45.3
c) 75.95
d) 13.3
Answer: c
Clarification: X = (D/2)/ (tan (semi point angle)). Semi point angle = point angle/2.

Manufacturing Engineering Multiple Choice Questions on “Welding Basics-1”.

1. Pinch effect in welding is the result of?
a) Electromagnetic forces
b) Electrostatic forces
c) Magnetic forces
d) Electric forces
Answer: a
Clarification: Pinch effect in welding gives narrow and long flame which is concentrated on the desired part and is achieved by an induction coil, which results in electromagnetic forces.

2. The junction between weld face and base metal is known as?
a) Throat
b) Toe
c) Root
d) Puddle
Answer: b
Clarification: The junction of the weld face and the base metal is known as ‘toe’. For a better weld, the junction should be as small as it can be in size.

3. The junction between two workpieces and weld face is known as?
a) Throat
b) Toe
c) Root
d) Puddle
Answer: a
Clarification: The throat of a weld is the distance from the centre of the face to the root of the weld. Typically, the depth of the throat should be at least as thick as the thickness of the metal we are welding.

4. The portion at which two workpieces are at the nearest distance is called?
a) Throat
b) Toe
c) Root
d) Puddle
Answer: c
Clarification: The weld root is the point at which the back of a weld intersects with the base metal surfaces. It determines the weld penetration and fusion to form a rigid joint.

5. The portion of weld joint that is melted by the heat of melting is called as ______________
a) throat
b) toe
c) root
d) puddle
Answer: d
Clarification: The arc spot or “puddle” weld is started by striking an arc on the deck surface, causing a hole to form in the deck. The weld operation then continues by depositing electrode material on the beam or joist and allowing the molten “puddle” to engage the penetrated deck.

6. Small weld used to temporarily hold the two pieces is called as ______________
a) crater
b) base metal
c) tack weld
d) penetration
Answer: c
Clarification: Tack welds are essentially temporary welds that help to hold two metals in place. The main purpose of the tack weld is to hold the two pieces of metal in place while we apply the actual, final weld.

7. What is the function of a torch?
a) It controls fuel rate
b) It mixes fuel and oxygen and controls delivery
c) It controls oxygen rate
d) It mixes fuel and hydrogen
Answer: b
Clarification: Torch mixes fuel and oxygen and controls delivery. It has two control valves, one for controlling the flow of acetylene and the other of oxygen, entering a chamber called mixing chamber where the two gases are mixed in a correct proportion.

8. The depth up to which, the filler material is mixed up with base metal is called?
a) Deposition
b) Reinforcement
c) Penetration
d) Fusion depth
Answer: c
Clarification: The depth up to which the filler material is mixed up with base metal is called as penetration. Penetration can be increased by increasing temperature and appropriate flux.

9. Weld pass is associated with the movement of __________
a) torch
b) metal
c) flux
d) electrode
Answer: a
Clarification: A single progression of welding or surfacing along a joint or substrate. The result of a pass is a weld bead.

10. The raised potion from the parent metal in welding is known as __________
a) deposition
b) fusion depth
c) penetration
d) reinforcement
Answer: d
Clarification: Weld metal in excess of the quantity required to fill a joint. This can be machined for a good surface finish.

Manufacturing Engineering Multiple Choice Questions on “Moulding sand”.

1. Which of the following is not a principle constituent of molding sand?
a) Silica
b) Aluminum
c) Iron oxide
d) Copper
Answer: d
Clarification: Copper is not a principle constituent of molding sand. Moulding sand is generally composed of silica, aluminum, and iron oxide.

2. When sand is in its natural moist state it is known as?
a) Green sand
b) Facing sand
c) Loam sand
d) Dry sand
Answer: a
Clarification: Green sand is a mixture of silica sand with 18-30% clay, having a water content in the range 6-8%. This name got its name “green” in the sense of “not ready” or “not processed” meaning.

3. Which of the following sand contains clay up to 50% and dries hard?
a) Green sand
b) Facing sand
c) Loam sand
d) Dry sand
Answer: c
Clarification: Loam sand contains clay up to 50% and dries hard. It covers less part of mould. This sand is used for loam sand moulds for making very heavy castings usually with the help of sweeps and skeleton patterns.

4. Which of the following sand is black in color?
a) Green sand
b) Facing sand
c) Loam sand
d) Backing sand
Answer: d
Clarification: Backing sand is black in color due to the presence of coal dust or due to burning. It contains mainly of old, used moulding sand which is black in colour due to the presence of coal dust etc on contact with any hot metal.

5. Which of the following sand is placed next to the surface and comes in contact with the molten metal?
a) Green sand
b) Facing sand
c) Loam sand
d) Backing sand
Answer: b
Clarification: Facing sand is placed next to the surface and meets the molten metal. Facing sand is the sand which covers the pattern all around it. The remaining box is filled with ordinary floor sand.

6. Green strength of sand does not depend upon?
a) Grain size
b) Moisture content
c) Shape and distribution of sand
d) Refractoriness of the sand
Answer: d
Clarification: The strength of the sand in green or moist state is termed as green strength. The green sand particles have the ability to cling to each other to impart sufficient strength to the mold.

7. The strength of the sand which is required to hold the shape of the mould cavity when the metal in the mould is still in liquid form is known as?
a) Hot strength
b) Green strength
c) High strength
d) Refractoriness of the sand
Answer: a
Clarification: When the moisture in sand being eliminated, the sand would reach at a high temperature when the metal in the mold is still in liquid state. The strength of the sand that is required to hold the shape of the cavity is called hot strength.

8. Which of the following will have better plasticity?
a) Coarse sand
b) Fine grained sand
c) Semi grained sand
d) Plasticity does not depend on sand grain size
Answer: b
Clarification: Plasticity is the ability of sand particles to undergo unrecoverable deformation at constant volume without cracking and crumbling. Fine grained sand particles will have better plasticity.

9. The passage of gaseous material, water and steam vapor through the molding sand is known as?
a) Plasticity
b) Flowability
c) Permeability
d) Refractoriness
Answer: c
Clarification: The passage of gaseous material, water and steam vapor through the molding sand is known as permeability. Sand which are coarse or have rounded grains exhibit more permeability. In the absence of adequate permeability, defects like surface blows, gas holes, mold blast etc. may be experienced.

10. Which of the following sand is coated with phenol or urea formaldehyde resins?
a) Shell sand
b) Green sand
c) Dry sand
d) Facing sand
Answer: a
Clarification: Shell sand is coated with phenol or urea formaldehyde resins.