Questions asked in ISRO interviews regarding fasteners
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Define shock test.
Rapid transfer of energy to a mechanical system which results in significant increase in stress, velocity, acceleration or displacement within the system is called a shock. Ek system ki natural frequency 200 Hz hai, matlab system apne aap 200 cycles per second mein vibrate karta hai jab usse disturb kiya jaye. Shock ke baare mein
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Why velocity is not given in the specification of vibration testing?
Sine vibration ke specifications ko define karte waqt velocity ke form mein na dene ke kaaran technical aur practical aspects se jude hain. Main reasons yeh hain: Example:Agar ek sine vibration test mein 10g acceleration at 200 Hz diya jaye, toh velocity calculate kar sakte hain: Conclusion:Velocity ke form mein specs na dene ka reason
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Use of different frequency bands in satellite
Satellite communication relies on various frequency bands, each with specific characteristics suited for different applications. Here’s a concise overview of the main frequency bands used in satellite systems, their properties, and common uses: Key Considerations:
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Insertion Loss in Wave guide and SR Cable
Waveguide aur semi-rigid cable mein insertion loss ka comparison karna frequency, material, aur design par depend karta hai. Generally: Conclusion: Waveguide mein insertion loss generally semi-rigid cable se kam hota hai, especially high-frequency applications mein. How does the dielectric material affect the losses? Dielectric material ka insertion loss pe effect semi-rigid cable mein kaafi important
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What is stress and how do you calculate stress?
What is Stress? Stress, in the context of physics and engineering, is a measure of the internal resistance of a material to external forces or deformations. It quantifies the force per unit area within a material that arises due to applied loads, pressure, or other external factors. Stress is a fundamental concept in mechanics, particularly
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Recent Developments in Mechanical Engineering
Mechanical engineering mein recent developments kaafi exciting aur innovative hain, jo industries aur technology ko transform kar rahe hain. 1. Additive Manufacturing (3D Printing): 2. Artificial Intelligence (AI) aur Machine Learning (ML): 3. Nanotechnology: 4. Sustainable Engineering: 5. Soft Robotics aur Biomechatronics: 6. Electrical Discharge Machining (EDM) ke Recent Advances: 7. Industry 4.0 aur IoT:
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Electrical Discharge Machining (EDM)
Electrical Discharge Machining (EDM) ek aisi manufacturing process hai jisme electricity ke sparks (chhoti si bijli ke chamak) ka use karke metal ya conductive materials ko shape diya jata hai ya unhe cut kiya jata hai. Isme ek tool (electrode) aur workpiece ke beech mein ek chhota sa gap hota hai, aur is gap mein
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Metal Additive Manufacturing
Additive manufacturing ka matlab hota hai “cheezon ko layer-by-layer banakar tayar karna.” Isse hum 3D printing bhi kehte hain. Isme material ko ek ek layer karke add kiya jata hai jab tak poori object ban nahi jaati. Ye traditional manufacturing (jisme material ko kaat kar ya ghis kar shape diya jata hai) se alag hoti
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Seeback Effect and Peltier Effect
Seebeck Effect aur Peltier Effect dono thermoelectric phenomena hain, jo electricity aur heat ke relation se connected hain. Inko samajhne ke liye, main inhe simple Hindi-English mix mein explain karta hoon: Seebeck Effect Yeh effect tab hota hai jab do different metals ya materials ke junction (jahan dono milte hain) pe temperature difference hota hai.
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