MCQOPTIONS
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MCQOPTIONS
This section includes 455 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The advantage of thermit welding is that |
| A. | all parts of the weld section are molten at the same time |
| B. | weld cools almost uniformly |
| C. | results in a minimum problem with internal residual stresses |
| D. | all of the above |
| Answer» E. | |
| 2. |
When the dimension is expressed as , then the tolerance is |
| A. | 0.035 mm |
| B. | 0.025 mm |
| C. | 0.01 mm |
| D. | 0.06 mm |
| Answer» E. | |
| 3. |
The most preferred process for casting gas turbine blades is |
| A. | die casting |
| B. | shell moulding |
| C. | investment moulding |
| D. | sand casting |
| Answer» C. investment moulding | |
| 4. |
Thermit, used in thermit welding, is a mixture of |
| A. | charcoal and iron oxide |
| B. | charcoal and aluminium |
| C. | iron oxide and aluminium |
| D. | charcoal, iron oxide and aluminium |
| Answer» D. charcoal, iron oxide and aluminium | |
| 5. |
The electrode tip diameter () in spot welding should be equal to (where = Thickness of plate to be welded) |
| A. | 1.5 |
| B. | 3 |
| C. | 6 |
| Answer» E. | |
| 6. |
When the dimension is expressed as , then the basic size is |
| A. | 20 mm |
| B. | 20.035 mm |
| C. | 20.025 mm |
| D. | 19.975 mm |
| Answer» B. 20.035 mm | |
| 7. |
When the dimension is expressed as , then the basic size is |
| A. | 20 mm |
| B. | 20.035 mm |
| C. | 20.025 mm |
| D. | 19.975 mm |
| Answer» B. 20.035 mm | |
| 8. |
When the dimension is expressed as , then the tolerance is |
| A. | 0.035 mm |
| B. | 0.025 mm |
| C. | 0.01 mm |
| D. | 0.06 mm |
| Answer» E. | |
| 9. |
According to Indian standards, the total number of tolerance grades are |
| A. | 8 |
| B. | 12 |
| C. | 18 |
| D. | 20 |
| Answer» D. 20 | |
| 10. |
According to Indian standard specifications, 100 H6/g 5 means that. |
| A. | basic size is 100 mm |
| B. | actual size is 100 mm |
| C. | difference between the actual size and basic size is 100 mm |
| D. | none of the above |
| Answer» B. actual size is 100 mm | |
| 11. |
In order to check the clearance between two mating surfaces, a __________ gauge should be used. |
| A. | ring |
| B. | plug |
| C. | feeler |
| Answer» D. | |
| 12. |
The difference between the upper limit and lower limt of a dimension is called |
| A. | nominal size |
| B. | basic size |
| C. | actual size |
| D. | tolerance |
| Answer» E. | |
| 13. |
A file with 50 - 60 teeth in 25 mm is called bastard file. |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
The length of hacksaw blade is the distance between the outside edges of the holes which fits over the pins. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 15. |
The width of slot cut by a hacksaw blade is __________ the width of the blade. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 16. |
For cutting brass, the hacksaw blade should have __________ teeth per 25 mm. |
| A. | 14 |
| B. | 24 |
| C. | 32 |
| D. | 40 |
| Answer» B. 24 | |
| 17. |
In order to cut mild steel, the cutting angle of chisel should be |
| A. | 30° |
| B. | 45° |
| C. | 50° |
| D. | 60° |
| Answer» E. | |
| 18. |
A process used for making thin phosphate coating on steel is called parkerising. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 19. |
The torch used for oxygen cutting is same as for oxy-acetylene welding. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 20. |
The vertical welding do not require plate edge preparation upto 16 mm thickness. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 21. |
In back-hand welding, the angle between the welding rod and the work is __________ as compared to fore-hand welding. |
| A. | same |
| B. | less |
| C. | more |
| Answer» B. less | |
| 22. |
In fore-hand welding, the angle between the welding torch and the work is __________ as compared to back-hand welding. |
| A. | same |
| B. | less |
| C. | more |
| Answer» D. | |
| 23. |
In fore-hand welding, the angle between the welding rod and the work is kept as |
| A. | 30°-40° |
| B. | 40°-50° |
| C. | 50°-60° |
| D. | 60°-70° |
| Answer» B. 40°-50° | |
| 24. |
When the weld is made from left to right, it is known as back-hand welding. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 25. |
In fore-hand welding, the weld is made |
| A. | from left to right |
| B. | from right to left |
| C. | first from left to right and then from right to left |
| D. | either from left to right or from right to left |
| Answer» C. first from left to right and then from right to left | |
| 26. |
If neutral flame is used in oxy-acetylene welding, both oxygen and acetylene cylinders of the same capacity will be emptied at the same time. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 27. |
In a gas welding of mild steel using an oxy-acetylene flame, the total amount of acetylene consumed is 10 litre. The oxygen consumption from the cylinder is |
| A. | 5 litre |
| B. | 10 litre |
| C. | 15 litre |
| D. | 20 litre |
| Answer» C. 15 litre | |
| 28. |
An oxidising flame is obtained when equal volumes of oxygen and acetylene are supplied. |
| A. | True |
| B. | False |
| Answer» C. | |
| 29. |
The brass and bronze are welded by __________ flame. |
| A. | neutral |
| B. | oxidising |
| C. | carburising |
| D. | all of these |
| Answer» C. carburising | |
| 30. |
Neutral flame is usd to weld |
| A. | steel |
| B. | cast iron |
| C. | copper |
| D. | all of these |
| Answer» E. | |
| 31. |
When more volume of acetylene and less volume of oxygen is supplied, then a __________ flame is obtained. |
| A. | neutral |
| B. | oxidising |
| C. | carburising |
| Answer» D. | |
| 32. |
The oxidising flame is similar to neutral flame but the inner cone is less luminous and shorter. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 33. |
Most of the oxy-acetylene welding is done with |
| A. | neutral flame |
| B. | oxidising flame |
| C. | carburising flame |
| D. | all of these |
| Answer» B. oxidising flame | |
| 34. |
For gas welding, the presure desired at the welding torch for acetylene is |
| A. | 7 to 103 kN/m2 |
| B. | 70 to 280 kN/m2 |
| C. | 280 to 560 kN/m2 |
| D. | 560 to 840 kN/m2 |
| Answer» B. 70 to 280 kN/m2 | |
| 35. |
The oxy-acetylene gas used in gas welding produce a flame temperature of |
| A. | 1800°C |
| B. | 2100°C |
| C. | 2400°C |
| D. | 3200°C |
| Answer» E. | |
| 36. |
In welding aluminium with TIG arc welding, alternating current is used. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 37. |
In welding magnesium with TIG arc welding, direct current with __________ is used. |
| A. | straight polarity |
| B. | reversed polarity |
| Answer» C. | |
| 38. |
In tungsten-inert gas arc welding, a __________ electrode is used. |
| A. | consumable |
| B. | non-consumable |
| Answer» C. | |
| 39. |
A large electrode is used in un-shielded arc welding. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 40. |
The welding set up is said to have reversed polarity when the work is connected to the negative terminal and the electrode holder to the positive terminal. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 41. |
When two metal pieces of different thicknesses are to be welded by projection welding, then the projections should be made on __________ metal piece. |
| A. | thinner |
| B. | thicker |
| Answer» C. | |
| 42. |
When two pieces of different metals are to be welded by projection welding, then the projection should be made on the metal piece having __________ conductivity. |
| A. | lower |
| B. | higher |
| Answer» C. | |
| 43. |
Seam weiding is a |
| A. | continuous spot welding process |
| B. | multi-spot welding process |
| C. | arc welding process |
| D. | process used for joining round bars |
| Answer» B. multi-spot welding process | |
| 44. |
In spot welding, the spacing between two spot weld should not be less than |
| A. | d |
| B. | 1.5 d |
| C. | 3 d |
| D. | 6 d |
| Answer» D. 6 d | |
| 45. |
In spot welding, the distance between the nearest edge of the plate and centre of weld should be equal to |
| A. | d |
| B. | 1.5 d |
| C. | 3 d |
| D. | 6 d |
| Answer» C. 3 d | |
| 46. |
In electric resistance welding, pressure is applied just after the completion of current. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 47. |
In bending operation, the metal takes the shape of a punch. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 48. |
In a __________ , both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram. |
| A. | simple die |
| B. | progressive die |
| C. | combination die |
| D. | compound die |
| Answer» D. compound die | |
| 49. |
In a __________ , two or more operations are performed simultaneously at the single stroke of the ram. |
| A. | simple die |
| B. | progressive die |
| C. | combination die |
| D. | compound die |
| Answer» C. combination die | |
| 50. |
The operation of giving impressions of figures, letters or designs on sheet metal parts, is known as embossing. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |