Mechanical Engineering Paper-I

Jharkhand Government Jobs Engineer

  • Conducted By JPSC
  • Maximum Marks 200
  • Duration 3 Hours

Exam Details

Detail Information
Examination FOREST RANGE OFFICER, MAIN EXAMINATION
Conducting Body JPSC
Paper Mechanical Engineering Paper-I
Subject Mechanical Engineering
Duration 3 Hours
Maximum Marks 200

This entry consolidates page 1 and page 2 OCR for Mechanical Engineering Paper-I (FRO3-ME) from the Forest Range Officer Main Examination. It covers Section A (four compulsory descriptive questions) and Section B (four out of seven descriptive questions). The objective_questions_preview array contains the corrected, bilingual question stems from page 2, split where necessary to reflect individual questions, with descriptive formatting and proper line breaks.

Major Topics Covered

  • Isochronism
  • Spring governed governors
  • Governor dynamics
  • Gating systems
  • Casting and gating
  • Steam boiler stresses
  • Principal stresses
  • Mohr’s circle
  • Flywheel dynamics
  • Energy fluctuation
  • Speed fluctuation
  • Maximum shear stress theory
  • Beam bending energy
  • Cantilever beam
  • Structural energy methods
  • Two-dimensional stress
  • Principal planes
  • Shear stress criteria
  • Stress transformation
  • Gating diagrams

Why This Paper is Important

  • Useful for FOREST RANGE OFFICER, MAIN EXAMINATION, preparation
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Related Resources

Instructions

  • नियामक के लिए नियामक गेंदों के घूर्णन की त्रिज्या बनाम नियंत्रक बल का आरेख बनाइए। [10] Define Isochronism for spring controlled governers and draw the controlling force Vs radius of rotation of governer balls for unstable, stable and Isochronous governers. FRO3-ME [1] PTO

Questions (page 2)

Q1.

(a) नियामक के लिए नियामक गेंदों के घूर्णन की त्रिज्या बनाम नियंत्रक बल का आरेख बनाइए।
Define Isochronism for spring controlled governers and draw the controlling force Vs radius of rotation of governer balls for unstable, stable and Isochronous governers. [10]

(b) 1. What is a Flywheel? Derive the expression for the fluctuation of energy and coefficient of fluctuation of speed.
मुख्य तनाव और मुख्य तल की परिभाषा दीजिए。
द्वि–आयामी तनाव प्रणाली में मुख्य तनावों और अधिकतम अपरूपण तनाव के लिए सूत्र व्युत्पन्न कीजिए。
Mohr’s circle method to graphically represent the state of stress at a point and explain how the principal planes are located.

Q2. झुकाव के कारण धरन में संग्रहित प्रत्यास्थ विकृति ऊर्जा के व्यंजक को व्युत्पन्न करें। [10] A cantilever beam of length L and flexural modulus EI is subjected to a point load P at the free end. Derive the expression of elastic strain energy stored in the beam due to bending. गेटिंग प्रणाली क्या है ? एक आरेख के द्वारा गेटिंग प्रणाली के विभिन्न तत्वों के नाम बताइए और उन्हें दर्शाइए। 3. [10] What is gating system? Name and show the various elements of a gating system by means of a diagram. एक भाप वाष्पित ढोल में मुख्य प्रतिबल P, 0.5P, 0, पॉइसन अनुपात γ = 0.30 और सरल तनाव में समतुल्य 4. प्रतिबल o को मानते हुए अधिकतम अपरूपण प्रतिबल सिद्धांत के कारण o के संदर्भ में P का मान ज्ञात करें। [10] Considering principle stresses in a steam boiler drum as P, 0.5P, 0 and Poisson's ratio γ = 0.30, equivalent stress in simple tension as σ, find P in terms of σ due to maximum shear stress theory. Section - B / खण्ड - ब गतिपालक चक्र क्या होता है? ऊर्जा के उतार-चढ़ाव और वेग के उतार-चढ़ाव गुणांक के लिए सूत्र व्युत्पन्न 1. कीजिए। [40] What is a Flywheel? Derive the expression for the fluctuation of energy and coefficient of fluctuation of speed. मुख्य तनाव और मुख्य तल की परिभाषा दीजिए। द्वि–आयामी तनाव प्रणाली में मुख्य तनावों और अधिकतम 2. अपरूपण तनाव के लिए सूत्र व्युत्पन्न कीजिए। मोर का वृत्त (Mohr’s circle) विधि का उपयोग करके किसी बिन्दु पर तनाव की अवस्था को आलेख रूप से दर्शाइए तथा यह समझाइए कि मुख्य तल कैसे ज्ञात किए जाते हैं। [40] Define principal stresses and principal planes. Derive the expressions for principal stresses and maximum shear stress in a two-dimensional stress system. Use Mohr's circle method to graphically represent the state of stress at a point and explain how the principal planes are located. FRO3-ME [2] 1ME0023

Q3. What is gating system? Name and show the various elements of a gating system by means of a diagram. [10]

Q4. प्रतिबल o को मानते हुए अधिकतम अपरूपण प्रतिबल सिद्धांत के कारण o के संदर्भ में P का मान ज्ञात करें। [10] Considering principal stresses in a steam boiler drum as P, 0.5P, 0 and Poisson's ratio γ = 0.30, equivalent stress in simple tension as σ, find P in terms of σ due to maximum shear stress theory.

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Frequently asked questions

What does Isochronism mean in governor theory?

Isochronism refers to the condition where the speed of rotation of the governor balls is constant with respect to the input signal, implying uniform speed regulation regardless of load changes.

What are the three kinds of governors discussed in the paper?

Unstable, stable, and isochronous governors.

What is the purpose of gating systems in casting?

A gating system directs molten metal into the mold cavity, controlling flow, temperature, and filling pattern to minimize defects.

Explain the maximum shear stress theory (Guest's theory) for failure.

It states that yielding occurs when the maximum shear stress in a material reaches the shear stress at yield in simple tension. P relates to principal stresses via the von Mises or Tresca criteria depending on formulation.

Define principal stresses and principal planes.

Principal stresses are the maximum and minimum normal stresses at a point on which shear stress is zero. Principal planes are the corresponding orientations where these stresses act.

What is a flywheel and why is energy fluctuation important?

A flywheel is a rotating mechanical device that stores rotational energy. Energy fluctuation and speed fluctuation relate to load variations and are used to assess stability and smoothness of power delivery.

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