MECHANICAL ENGINEERING PAST PAPERS AND SYLLABUS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
خالی کرنے کے عمل میں ، قینچ کا زاویہ ______ پر فراہم کیا جاتا ہے؟
- Depends on the material of work piece
- Die only
- Punch only
- Both on die and punch
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Explanation
In blanking, the shear angle is applied to both punch and die to reduce punching force.
This improves the quality of the cut edge and prolongs tool life.
کی تشکیل میں آسٹیمپرنگ کے نتائج کا عمل؟ ______
- Martensite structure
- Bainite structure
- Carburized structure
- None of the above
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Explanation
Austempering is a heat treatment that produces bainite, which is tough and strong.
It avoids the brittleness associated with martensite while improving hardness.
فلر میٹل ______ میں استعمال ہوتا ہے؟
- Gas welding
- Seam welding
- Spot welding
- None of these
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Explanation
Filler metal is added in gas welding to join two metal pieces and fill gaps.
It melts along with the base metal to form a strong welded joint.
پلاسٹک کے مضامین عام طور پر ______ کے ذریعہ تیار کیے جاتے ہیں؟
- Injection moulding
- Shell moulding
- Green sand moulding
- None of these
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Explanation
Injection moulding is commonly used to produce plastic parts by injecting molten plastic into molds.
It allows high-volume, precise, and complex-shaped plastic products.
پارگمیتا ______ کے لئے ناقص ہے؟
- Rounded
- Fine grains
- Medium
- None of these
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Explanation
Fine grains reduce the void spaces between particles, limiting fluid flow.
Coarse or rounded grains allow easier passage, so permeability is higher.
ڈراپ فورجنگ میں ، جعل سازی _____ چھوڑ کر کی جاتی ہے؟
- A weight on hammer to produce the requisite impact
- The work piece at high velocity
- The hammer at high velocity
- None of these
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Explanation
Drop forging uses a heavy hammer dropped onto the workpiece to shape it under impact.
This process improves strength and grain structure of the forged component.
- Printing letters and numbers on metal sheets
- Producing seamless tubes
- Shaping thin sheets by pressing them against a form
- None of these
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Explanation
Stamping involves pressing or punching metal sheets into desired shapes using dies.
It is widely used in automobile panels, appliances, and metal components.
لائٹ ڈیوٹی کے کام کے لئے کون سی کلید استعمال کی جاتی ہے؟
- Feather key
- Saddle key
- Sunk key
- All of the above
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Explanation
Saddle keys are simple, lightly loaded keys used for light-duty work.
They are easy to fit and do not require machining of the shaft.
میں بقایا دباؤ موجود ہیں؟ _____
- Forged shafts
- Cold rolled shaft
- Cast shafts
- None of these
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Explanation
Cold rolling induces plastic deformation at room temperature, leading to residual stresses.
Forged, hot-rolled, and cast shafts generally have lower residual stresses due to high-temperature processing.
- Magnallum
- Emulsions
- Amalgams
- None of these
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Explanation
Amalgams are alloys in which mercury is a principal component.
They are commonly used in dental fillings and some industrial applications.
