Indian Forest Service 2018 Mechanical Engineering Paper II PDF

Central Government Jobs Engineer 2018

  • Year 2018
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 200
  • Duration Three Hours
  • Languages English

Exam Details

Detail Information
Examination Indian Forest Service (Main) Examination
Year 2018
Conducting Body UPSC
Paper Mechanical Engineering Paper - II
Subject Mechanical Engineering
Duration Three Hours
Maximum Marks 200
Number of Questions 8
Question Type Mixed

This is the Mechanical Engineering Paper II from the Indian Forest Service (Main) Examination 2018, conducted by UPSC. The paper is designed to test in-depth knowledge of mechanical engineering principles. It consists of 8 questions, of which candidates must attempt 5, including compulsory questions 1 and 5. The exam duration is three hours, with a maximum of 200 marks. This paper is crucial for aspirants aiming to qualify for the prestigious Indian Forest Service, providing valuable insights into the expected question patterns and difficulty levels.

Major Topics Covered

  • Thermodynamics
  • Heat Transfer
  • Refrigeration Systems
  • Real Gases
  • Entropy
  • Van der Waals Equation
  • Boiling Point
  • Latent Heat
  • Atmospheric Isothermal Condition
  • Height Estimation
  • Heat Loss Rate
  • Reversible Work Input
  • Irreversibility
  • Rectangular Fin
  • Thermal Conductivity
  • Heat Transfer Coefficient
  • Vapour Compression Refrigeration
  • Capillary Tube
  • T-s Diagram
  • Moist Air
  • Dry Bulb Temperature
  • Wet Bulb Temperature
  • Dew Point Temperature
  • Saturated Condition
  • Radiation Heat Transfer
  • Emissivity
  • Steady State Temperature
  • Heat Flow

Why This Paper is Important

  • Useful for Indian Forest Service (Main) Examination preparation
  • Helps understand the latest exam pattern
  • Useful for practice and self-assessment
  • Covers frequently asked General Studies topics
  • Helpful for analysing question trends

Related Resources

  • Indian Forest Service (Main) Examination 2018 Mechanical Engineering Paper - I
  • Indian Forest Service (Main) Examination 2017 Mechanical Engineering Paper - II
  • Indian Forest Service (Main) Examination 2019 Mechanical Engineering Paper - II
  • Indian Forest Service 2018 Mechanical Engineering Paper II Answer Key
  • Indian Forest Service Mechanical Engineering Syllabus
  • UPSC Mechanical Engineering Syllabus
  • Indian Forest Service Exam Pattern
  • UPSC Main Exam Pattern

Instructions

  • There are EIGHT questions in all, out of which FIVE are to be attempted.
  • Out of the remaining SIX questions, THREE are to be attempted selecting at least ONE question from each of the two Sections A and B.
  • Attempts of questions shall be counted in sequential order.
  • Unless struck off, attempt of a question shall be counted even if attempted partly.
  • Any page or portion of the page left blank in the Question-cum-Answer Booklet must be clearly struck off.
  • The number of marks carried by a question/part is indicated against it.
  • Answers must be written in ENGLISH only.
  • Unless otherwise mentioned, symbols and notations have their usual standard meanings.
  • Assume suitable data, if necessary and indicate the same clearly.
  • Neat sketches may be drawn, wherever required.
  • Newton may be converted to kgf using the equality 1 kilonewton (1 kN) ---- 100 kgf, if found necessary.
  • Take: 1 kcal = 4.187 kJ and 1 kg/cm2 – 0.98 bar 1 bar = 10^5 pascals Universal gas constant = 8314.6 J/kmol-K Psychrometric chart is enclosed.

Questions (page 2)

Section A

Q1.

(a) Derive a general expression for the change in entropy of a real gas obeying the van der Waals equation.

(b) The boiling point of water at the top of a hill is found to be 90\circC, whereas it boils at 99.6\circC with the latent heat of evaporation of 2256.94 kJ/kg at the foot of the hill (where the pressure is 101.325 kPa). Assuming that the atmosphere is locally isothermal at 300 K (i.e. pv = p_0v0 is valid), estimate the height of the hill.

(c) A house, that is losing heat at a rate of 50,000 kJ/h when the outside temperature drops to 4°C, is to be heated by electric resistance heaters. If the house is to be maintained at 25°C at all times, determine the reversible work input for this process and the irreversibility.

(d) Determine the heat transfer rate from a rectangular fin of length 20 cm, width 40 cm and thickness 2 cm. The tip of the fin is not insulated and the fin has a thermal conductivity of 150 W/mK. The base temperature is 100°C and the fluid is at 20°C. The heat transfer coefficient between the fin and the fluid is 30 W/m^2K.

(e) What purposes does an expansion device serve in a vapour compression refrigeration system? Explain how a simple capillary tube can serve these purposes.

Section A

Q2.

(a) Prove that: (\partial P)/(\partial T))\rm s = (k)/(k-1) (\partial P)/(\partial T))\rm v where k = Cp / Cv. \mathrmHint:\mathrmC_\mathrmp-\mathrmC_\mathrmv = -\mathrmT\!(\partial \mathrmV)/(\partial \mathrmT))\!2_{\mathrmP}\;(\partial \mathrmP)/(\partial \mathrmV))_{\mathrmT}]

(b) Three thin walled infinitely long hollow cylinders of radii 5 cm, 10 cm and 15 cm are arranged coaxially. The temperatures of the innermost and outermost cylinders are respectively 1000 K and 300 K. Calculate the steady state temperature of the middle cylinder surface and the heat flow per m2 area of the innermost cylinder. Assume emissivity of all the cylinders to be 0.5 and vacuum in the spaces between the cylinders. Take σ = 5.67 × 10-8 \text W/m^2\textK4.

(c) Explain, with the help of T-s diagram, that for atmospheric moist air T\rm dry\ bulb > T\rm wet\ bulb > T\rm dew\ point, in unsaturated condition, and T_{\textdry bulb} = T_{\textwet bulb} = T_{\textdew point} in saturated condition.

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Frequently asked questions

What is the full name of the exam?

The full name of the exam is the Indian Forest Service (Main) Examination.

Which year is this question paper from?

This question paper is from the 2018 examination.

Who conducts the Indian Forest Service Examination?

The Indian Forest Service Examination is conducted by the Union Public Service Commission (UPSC).

What is the subject of this paper?

This paper is for Mechanical Engineering, specifically Paper II.

What is the time duration for this paper?

The time allowed for this paper is Three Hours.

What is the maximum marks for this paper?

The maximum marks for this paper is 200.

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