## Kerala PSC Previous Years Question Paper & Answer

Title : RANGE FOREST OFFICER
Question Code : A

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Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'RANGE FOREST OFFICER ' And exam conducted in the year 21. And Question paper code was '047/21'. Medium of question paper was in Malayalam or English . Booklet Alphacode was 'A'. Answer keys are given at the bottom, but we suggest you to try answering the questions yourself and compare the key along wih to check your performance. Because we would like you to do and practice by yourself.

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Excerpt of Question Code: 047/21

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Total Number of Questions : 32

Time : 3.00 Hours Max. Marks : 2
1. Write four assumptions in Euler’s column theory. (2 Marks)
2. Write Grashof's law for four bar chain mechanism. (2 Marks)
3. What is fin effectiveness and fin efficiency ? (2 Marks)
4. Draw pressure-temperature diagram of a substance that expand on freezing. Indicate triple point

and critical point. (2 Marks)
5. Name the basic components of a robot. (2 Marks)
6. An inventor claims that he has developed a refrigerator having refrigerating capacity of 120 W at
-23°C. The input power requirement is 20W. The ambient temperature is 27°C. Check the validity of
his claim. (4 Marks)
7. State the first law of thermodynamics for a closed system undergoing a cycle. What is PMMI ? Why
it is impossible 7 (4 Marks)
8. Asolid uniform metal bar of diameter ‘D’ and length ‘I’ is hanging vertically from its upper end. If ‘r’
is the specific weight and ‘E’ is the Young’s Modulus of the bar, obtain an expression for the total
elongation of the bar due to its own weight. (4 Marks)
9, A flow field is characterised by stream function प, = x’y. Determine the velocity potential ¢ for the
flow if the flow is irrotational. (4 Marks)
10. Discuss the differences between motion study and time study on the basis of purpose, scope and
procedure. (4 Marks)
11. State fundamental law of gearing. Name two types of profiles that satisfy this law. What is pressure
angle ? (5 Marks)
12. Define DBT, WBT, DPT and relative humidity of moist air. What is wet bulb depression ? What does
it indicate ? (5 Marks)
13. List down any four assumptions for the analysis of air standard cycles. Write the thermal efficiency
in terms of highest temperature T,, and lowest temperature 1, for an engine working on (1) Carnot
cycle (2) Stirling cycle with perfect regeneration. (5 Marks)
14. What are the different modes in which a material can fail ? Whatis factor of safety ? Why is it necessary
to provide factor of safety (any two reasons) ? (5 Marks)
15. Distinguish between internal combustion engines and external combustion engines (any five). (5 Marks)
16. Write the components and % composition of components in the following alloys.

1} Muntz metal

2) Constantan

3) Inconel

4) Tin babbitt

5) Commercial Bronze (5 Marks)

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