Download GTU BE/B.Tech 2019 Winter 1st And 2nd Sem Old 110006 Elements Of Mechanical Engineering Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 1st And 2nd Sem Old 110006 Elements Of Mechanical Engineering Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? I & II (OLD) EXAMINATION ? WINTER 2019
Subject Code: 110006 Date: 03/01/2020

Subject Name: Elements Of Mechanical Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:
1. Attempt any five questions.
2. Make suitable assumptions wherever necessary.
3. Steam Table is permitted
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 Faction.
04
(c)
2 kg of gas is compressed from 1 bar and 30
0
C according to the law PV
1.3
= 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, C p= 1.75 kJ/kg K.
07

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:
(1) P= 10 bar, v= 0.180 m
3
/kg
(2) P= 10 bar, t = 200
0
C
(3) P= 25 bar, h = 2750 kJ/kg
07

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
(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
0
C, Maximum temperature 1500
0
C
Take Cv = 0.718 kJ/kg K and 4 . 1 ? ?
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

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

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