Subject Code: 110006
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- I & II (OLD) EXAMINATION — WINTER 2019Subject Name: Elements Of Mechanical Engineering
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt any five questions.
- Make suitable assumptions wherever necessary.
- Steam Table is permitted
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Q.1 (a) What do you mean by non-conventional energy sources? How does it differ from conventional sources? 03
(b) Define : (i) Sensible heat (ii) Enthalpy of evaporation (iii) Heat of superheat (iv) Dryness Fraction. 04
(c) 2 kg of gas is compressed from 1 bar and 30 °C according to the law PV? = C. The pressure after compression is 6 bar. Calculate (1) Characteristic Gas Constant (2) Temperature at the end of compression (3) Work done (4) Heat supplied (5) Change in internal Energy. Take molecular mass of gas = 30, Cp= 1.75 kJ/kg K. 07
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Q.2 (a) Explain the steam formation at constant pressure. 03
(b) For adiabatic process derive PV? = constant. 04
(c) Determine the quality of steam for the following cases: 07
- P=10 bar, v=0.180 m3/kg
- P=10 bar, t =200 °C
- P=25 bar, h=2750 kJ/kg
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Q.3 (a) Give comparison of belt drive, Chain drive and gear drive. 03
(b) Differentiate between petrol engine and diesel engine. 04
(c) A six cylinder four stroke IC engine is to develop 89.5 KW indicated power at 800 rpm. The stroke to bore ratio is 1.25:1. Assuming mechanical efficiency of 80% and brake mean effective pressure of 5 bar, determine the diameter and stroke of the engine. 07
Q.4 (a) Derive equation for air standard efficiency of Otto cycle. 07
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(b) Determine the compression ratio, The cycle efficiency, and the ratio of maximum to minimum pressure in an air standard Otto cycle from following data: Minimum temperature 25 °C, Maximum temperature 1500 °C Take Cv=0.718 kJ/kgK and ? =1.4 07
Q.5 (a) Classify centrifugal pumps. With neat sketch explain the function of each part of centrifugal pump. 07
(b) With neat sketch describe the construction and working of Babcock and Wilcox boiler. 07
Q.6 (a) What is refrigeration? Explain the working of vapour compression refrigeration cycle. Name basic components of VCRC. 07
(b) What are the applications of compressor? Derive an expression of work done for single stage single acting reciprocating air compressor without clearance. 07
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Q.7 (a) What are belt drives? List various belt drives and explain cross belt drive. 07
(b) What is the difference between ferrous and nonferrous materials? List out various ferrous and nonferrous materials with their application. 07
Date: 03/01/2020
Total Marks: 70
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This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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