MCQOPTIONS
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MCQOPTIONS
This section includes 112 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Tools knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The mould material used for moulding is a granite. |
| A. | true |
| B. | false |
| Answer» C. | |
| 2. |
Which of the following component gives the necessary plasticity to sand? |
| A. | silica |
| B. | clay |
| C. | moisture |
| D. | all of the mentioned |
| Answer» C. moisture | |
| 3. |
Which of the following component withstand the high temperature incasting process? |
| A. | clay |
| B. | moisture |
| C. | silica |
| D. | water |
| Answer» D. water | |
| 4. |
The casting can be defined as pouring of molten metal into a mouldand taking it out after it becomes vapor. |
| A. | true |
| B. | false |
| Answer» C. | |
| 5. |
“Bell” shapes are generally made by |
| A. | Single piece pattern |
| B. | Gated pattern |
| C. | Cope and drag pattern |
| D. | Sweep pattern |
| Answer» E. | |
| 6. |
______ enhances the directional solidification of complex casting geometries |
| A. | Runner extension |
| B. | Bottom gate |
| C. | Step gate |
| D. | Chill |
| Answer» E. | |
| 7. |
If a cube of 100 mm dimension is to be made of Aluminium (Shrinkage allowance = 10 mm/m.) What will be the dimension of wooden pattern? Assume only shrinkage allowance. |
| A. | 102 mm × 101 mm × 100 mm |
| B. | 100 mm × 99 mm × 98 mm |
| C. | 99 mm × 99 mm × 99 mm |
| D. | 101 mm × 101 mm × 101 mm |
| Answer» E. | |
| 8. |
Consider the following statements for a different patternA. Polystyrene is a disposable patternB. Wood is a non-disposable patternC. Rubber is a disposable patternD. Metal is a non-disposable pattern |
| A. | Only A is correct |
| B. | Both A and B is correct |
| C. | Only C is correct |
| D. | A, B and D are correct |
| Answer» E. | |
| 9. |
A casting 200 × 200 × 70 mm3 size solidifies in 10 mins. Solidification time for 200 × 100 × 10 mm3 under similar conditions is given below find it: |
| A. | 0.748 min |
| B. | 0.648 min |
| C. | 0.848 min |
| D. | 0.948 min |
| Answer» C. 0.848 min | |
| 10. |
Hot tear refers to _____. |
| A. | Casting defect |
| B. | Process of fabrication |
| C. | Process of heat treatment |
| D. | Weathering of non-ferrous materials |
| Answer» B. Process of fabrication | |
| 11. |
Hollow casting with thin walls can be made by process of: |
| A. | Die casting |
| B. | Vacuum casting |
| C. | Slush casting |
| D. | Pressure casting |
| Answer» D. Pressure casting | |
| 12. |
Chaplets are used in ______. |
| A. | welding |
| B. | forging |
| C. | casting |
| D. | extrusion |
| Answer» D. extrusion | |
| 13. |
Chaplets are used to : |
| A. | Support Riser |
| B. | Prevent entry of dross into the mould |
| C. | Improve Directional Solidification of the mould |
| D. | To Support Core in the mould |
| Answer» E. | |
| 14. |
In sand casting, fluidity of the molten metal increases with: |
| A. | increases in sand grain size |
| B. | increases in degree of superheat |
| C. | decrease in pouring rate |
| D. | increases in thermal conductivity of the mould |
| Answer» C. decrease in pouring rate | |
| 15. |
Addition of coal dust to the green moulding sand is to improve |
| A. | Permeability |
| B. | Surface finish |
| C. | Mouldability |
| D. | Green strength |
| Answer» C. Mouldability | |
| 16. |
Components produced by die-casting have finer grain, higher strength and greater hardness at the skin than at the centre due to |
| A. | The decreased wall thickness of the die cavity |
| B. | Rapid chilling of molten metal at the die walls |
| C. | High temperature involved in the process |
| D. | The high tonnage of die casting machines |
| Answer» C. High temperature involved in the process | |
| 17. |
In a casting process, a mould of dimension 60 cm x 30 cm x 14 cm is to be filled by liquid metal using the top pouring method. The liquid metal height above the top surface of the mould is 14 cm and the area of the gate is 6 cm2. The time taken to fill the mould will be: |
| A. | 32 s |
| B. | 12 s |
| C. | 25.34 s |
| D. | 28.28 s |
| Answer» D. 28.28 s | |
| 18. |
In aluminium casting bubbles of argon or nitrogen are passed through the molten metal |
| A. | to improve surface finish of the casting |
| B. | to remove hydrogen gas porosity |
| C. | to precipitate the inclusions |
| D. | to mix the alloy elements |
| Answer» C. to precipitate the inclusions | |
| 19. |
In full mould (cavity-less) casting process, the pattern is made of |
| A. | expanded polystyrene |
| B. | wax |
| C. | epoxy |
| D. | plaster of Paris |
| Answer» B. wax | |
| 20. |
Match plate pattern is used in _____. |
| A. | green sand moulding |
| B. | bench moulding |
| C. | pit moulding |
| D. | machine moulding |
| Answer» E. | |
| 21. |
Match the following products with preferred manufacturing processes:ProductProcessP. Rails(1) Blow moldingQ. Engine crankshaft(2) ExtrusionR. Aluminum channels(3) ForgingS. PET water bottles(4) Rolling |
| A. | P - 4,Q - 3,R - 1,S - 2 |
| B. | P - 4,Q - 3,R - 2,S - 1 |
| C. | P - 2,Q - 4,R - 3,S - 1 |
| D. | P - 3,Q - 4,R - 2,S - 1 |
| Answer» C. P - 2,Q - 4,R - 3,S - 1 | |
| 22. |
A taper provided on pattern for its easy withdrawal from the mold is called ________ allowance. |
| A. | shrinkage |
| B. | machining |
| C. | draft |
| D. | distortion |
| Answer» D. distortion | |
| 23. |
In centrifugal casting method, ________ core is used. |
| A. | sand |
| B. | no |
| C. | ferrous |
| D. | Non-ferrous |
| Answer» C. ferrous | |
| 24. |
Gears are casted by- |
| A. | Permanent mould casting |
| B. | Slush casting |
| C. | Centrifugal casting |
| D. | All of the options |
| Answer» B. Slush casting | |
| 25. |
A 200 mm long down sprue has an area of cross-section of 650 mm2 where the pouring basin meets the down sprue (i.e. at the beginning of the down sprue). A constant head of molten metal is maintained by the pouring basin. The molten metal flow rate is 6.5 × 105 mm3/s. Considering the end of down sprue to be open to atmosphere and an acceleration due to gravity of 104 mm/s2, the area of the down sprue in mm2 at its end (avoiding aspiration effect) should be |
| A. | 650 |
| B. | 350 |
| C. | 290.7 |
| D. | 190 |
| Answer» D. 190 | |
| 26. |
In continuous casting process, the mould is generally made of |
| A. | Cast iron |
| B. | Bronze |
| C. | Copper |
| D. | Tungsten carbide |
| Answer» D. Tungsten carbide | |
| 27. |
Consider that the following materials are usable for manufacturing dies, moulds in the investment casting process for large-scale production:1. Aluminium alloy2. Magnesium alloy3. Brass4. Low-carbon steelWhich of the above are correctly usable? |
| A. | 1, 2 and 3 only |
| B. | 1, 2 and 4 only |
| C. | 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» B. 1, 2 and 4 only | |
| 28. |
Due to the shake allowance: |
| A. | The pattern is made slightly bigger than required size |
| B. | The taper is provided on vertical faces of pattern |
| C. | The pattern is made slightly smaller than required size |
| D. | The fillets are provided on pattern |
| Answer» D. The fillets are provided on pattern | |
| 29. |
A cylindrical job with diameter of 200 mm and height of 100 mm is to be cast using modulus method of riser design. Assume that the bottom surface of cylindrical riser does not contribute as cooling surface. If the diameter of the riser is equal to its height, then the height of the riser (in mm) is |
| A. | 150 |
| B. | 200 |
| C. | 100 |
| D. | 125 |
| Answer» B. 200 | |
| 30. |
A cubic casting of 50 mm side undergoes volumetric solidification shrinkage and volumetric solid contraction of 4% and 6% respectively. No riser is used. Assume uniform cooling in all directions. The side of the cube after solidification and contraction is |
| A. | 48.32 mm |
| B. | 49.90 mm |
| C. | 49.94 mm |
| D. | 49.96 mm |
| Answer» B. 49.90 mm | |
| 31. |
______are used for withdrawing patterns from the mould. |
| A. | Riddles |
| B. | Draw spikes |
| C. | Vent wire |
| D. | Slicks |
| Answer» C. Vent wire | |
| 32. |
According to Chvorinov's rule, the solidification time of casting is proportional to (Volume/surface area)n. The value of the exponent 'n' for metal is equal to: |
| A. | 2 |
| B. | 3 |
| C. | 2.5 |
| D. | 1.5 |
| Answer» B. 3 | |
| 33. |
Fluidity in casting (CI) operation is greatly influenced by |
| A. | Melting temperature of molten metal |
| B. | Pouring temperature of molten metal |
| C. | Finish of the mould |
| D. | Carbon content of molten metal |
| Answer» C. Finish of the mould | |
| 34. |
Consider the following processing methods for plastics:1. Transfer moulding2. Extrusion3. Thermoforming4. CalenderingWhich of these are best suited for processing of plastics to their final shape? |
| A. | 1, 2 and 3 only |
| B. | 1, 2 and 4 only |
| C. | 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» E. | |
| 35. |
_______ is not a method of casting cleaning |
| A. | Shot blasting |
| B. | Sand-blasting |
| C. | Tumbling |
| D. | Acid blasting |
| Answer» D. Acid blasting | |
| 36. |
Hollow pipes and barrels are produced in: |
| A. | centrifugal casting |
| B. | true centrifugal casting |
| C. | die casting |
| D. | semi centrifugal casting |
| Answer» C. die casting | |
| 37. |
Assertion (A): Die-casting yields a product of good accuracy and finish.Reason (R): Low melting alloys are used in die casting. |
| A. | Both A and R individually true and R is the correct explanation of A. |
| B. | Both A and R individually true and R is not the correct explanation of A. |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 38. |
Match the items in Column I and Column II.Column IColumn IIP. Metallic Chills1. Support for the coreQ. Metallic Chaplets2. Reservoir of the molten metalR. Riser3. Control cooling of critical sectionsS. Exothermic Padding4. Progressive solidification |
| A. | P – 1, Q – 3, R – 2, S – 4 |
| B. | P – 1, Q – 4, R – 2, S – 3 |
| C. | P – 3, Q – 4, R – 2, S –1 |
| D. | P – 4, Q – 1, R – 2, S – 3 |
| Answer» E. | |
| 39. |
As per the casting cooling equation, the solidification time TS of casting and its volume V has a relation represented as: |
| A. | TS ∝ V2 |
| B. | TS ∝ V0.5 |
| C. | TS ∝ V-2 |
| D. | TS ∝ V |
| Answer» B. TS ∝ V0.5 | |
| 40. |
Cast iron pipes are cast by |
| A. | Die casting process |
| B. | Centrifugal casting process |
| C. | Investment casting process |
| D. | Vaccum Moulding process |
| Answer» C. Investment casting process | |
| 41. |
Plastic bottles are made using: |
| A. | Blow moulding |
| B. | Injection moulding |
| C. | Perform moulding |
| D. | Slush moulding |
| Answer» B. Injection moulding | |
| 42. |
In casting, misrun occurs due to: |
| A. | very low fluidity of molten metal |
| B. | absorption of gases by liquid metal |
| C. | improper alignment of mould flask |
| D. | high pouring temperature of metal |
| Answer» B. absorption of gases by liquid metal | |
| 43. |
A sphere-shaped casting solidifies on 10 min. What will be the solidification time in minutes for another sphere of the same material, which is 8 times heavier than the original casting ? |
| A. | 80 |
| B. | 10 |
| C. | 40 |
| D. | 20 |
| Answer» D. 20 | |
| 44. |
Patterns are usually coated with a parting agent to: |
| A. | Increase strength of pattern |
| B. | project pattern |
| C. | Facilitate their removal from the moulds |
| D. | Increase strength of mould |
| Answer» D. Increase strength of mould | |
| 45. |
Drossing in foundry practice refers to |
| A. | A method of cleaning the castings |
| B. | An inspection method for castings |
| C. | method of de-oxidation of molten metal |
| D. | The formation of oxides on the molten metal surface |
| Answer» E. | |
| 46. |
Keeping the surface area constant if the volume of a casting is doubled by changing its design the solidification time is expected to increase by a factor of |
| A. | √2 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» D. 8 | |
| 47. |
A big casting is to have a hole, to be produced by using a core of 10 cm diameter and 200 cm long. The density ρ metal is 0.077 N/cm3 and density ρcore is 0.0165 N/cm3. What is the upward force acting on the core prints? |
| A. | 200.5 N |
| B. | 1100.62 N |
| C. | 950.32 N |
| D. | 350.32 N |
| Answer» D. 350.32 N | |
| 48. |
In a gating system, the ratio 1:2:4 represents |
| A. | sprue base area: runner area: ingate area |
| B. | pouring basin area: ingate area: runner area |
| C. | sprue base area: ingate area: casting area |
| D. | runner area: ingate area: casting area |
| E. | sprue base area: ingate area: runner area |
| Answer» B. pouring basin area: ingate area: runner area | |
| 49. |
A taper provided on the pattern for its easy and clean withdrawal from the mould is known as: |
| A. | Machining allowance |
| B. | Draft allowance |
| C. | Shrinkage allowance |
| D. | Distortion allowance |
| Answer» C. Shrinkage allowance | |
| 50. |
For mounting several patterns at a time, which of the following type of pattern is used? |
| A. | Combined pattern |
| B. | Loose piece pattern |
| C. | Sweep pattern |
| D. | Match plate pattern |
| Answer» E. | |