Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 1st And 2nd Sem (New And SPFU) 3110006 Basic Mechanical Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?I &II (NEW) EXAMINATION ? SUMMER-2019
Subject Code: 3110006 Date: 04/06/2019
Subject Name: Basic Mechanical Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of steam table is permitted.
Marks
Q.1 (a) Define Melting point, Boiling point and Tripple point of water using p-v
diagram.
03
(b) Derive an expression for internal energy for a closed system. 04
(c) Define specific heat at Constant volume, constant pressure and Adiabatic
index. Also derive relationship between specific heats in form of
Characteristic gas constant.
07
Q.2 (a) Discuss the factors responsible for global warming and Ozone depletion 03
(b) Explain Equivalent evaporation and factor of evaporation 04
(c) Determine the value of final dryness fraction of steam
1. After losing 125 kJ from the steam at constant pressure.
2. After expansion to 3 bar pressure in a turbine stage and work
equivalent of 20 kJ/kg done
Initially steam is available at 7 bar pressure and 0.9 dryness fraction.
07
OR
(c) Three kg of steam at a pressure of 10 bar exists in the following
conditions. Calculate its enthalpy and internal energy in each of the
cases.
1. Steam with x = 0.91
2. Steam at temperature 200
o
C
07
Q.3 (a) Explain the construction and function of Steam Trap with neat sketch.
Also mention its specific location in the system.
03
(b) Derive the equation for efficiency of Carnot 04
(c) A double acting reciprocating pump has piston diameter of 150 mm and
stroke length of 225 mm. the suction and delivery heads are 4 m and 12
m respectively. If the speed of the pump is 80 rpm and the actual
quantity of water discharged is 0.61 m
3
/min. find the percentage slip, the
coefficient of discharge and the power required to drive the pump if the
efficiency of the pump is 80%.
07
OR
Q.3 (a) Explain the construction and function of Steam separator with neat
sketch. Also mention its specific location in the system.
03
(b) Prove that the efficiency of Otto cycle is greater than that of Diesel cycle
for the same compression ratio.
04
(c) Air is to be compressed in a single stage reciprocating compressor from
1.013 bar and 15
o
C to 7 bar. Calculate the indicated power required for
free air delivery of 0.3 m
3
/min when the compression process is
1. Isentropic
2. Reversible isothermal
3. Polytropic with n = 1.25.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?I &II (NEW) EXAMINATION ? SUMMER-2019
Subject Code: 3110006 Date: 04/06/2019
Subject Name: Basic Mechanical Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of steam table is permitted.
Marks
Q.1 (a) Define Melting point, Boiling point and Tripple point of water using p-v
diagram.
03
(b) Derive an expression for internal energy for a closed system. 04
(c) Define specific heat at Constant volume, constant pressure and Adiabatic
index. Also derive relationship between specific heats in form of
Characteristic gas constant.
07
Q.2 (a) Discuss the factors responsible for global warming and Ozone depletion 03
(b) Explain Equivalent evaporation and factor of evaporation 04
(c) Determine the value of final dryness fraction of steam
1. After losing 125 kJ from the steam at constant pressure.
2. After expansion to 3 bar pressure in a turbine stage and work
equivalent of 20 kJ/kg done
Initially steam is available at 7 bar pressure and 0.9 dryness fraction.
07
OR
(c) Three kg of steam at a pressure of 10 bar exists in the following
conditions. Calculate its enthalpy and internal energy in each of the
cases.
1. Steam with x = 0.91
2. Steam at temperature 200
o
C
07
Q.3 (a) Explain the construction and function of Steam Trap with neat sketch.
Also mention its specific location in the system.
03
(b) Derive the equation for efficiency of Carnot 04
(c) A double acting reciprocating pump has piston diameter of 150 mm and
stroke length of 225 mm. the suction and delivery heads are 4 m and 12
m respectively. If the speed of the pump is 80 rpm and the actual
quantity of water discharged is 0.61 m
3
/min. find the percentage slip, the
coefficient of discharge and the power required to drive the pump if the
efficiency of the pump is 80%.
07
OR
Q.3 (a) Explain the construction and function of Steam separator with neat
sketch. Also mention its specific location in the system.
03
(b) Prove that the efficiency of Otto cycle is greater than that of Diesel cycle
for the same compression ratio.
04
(c) Air is to be compressed in a single stage reciprocating compressor from
1.013 bar and 15
o
C to 7 bar. Calculate the indicated power required for
free air delivery of 0.3 m
3
/min when the compression process is
1. Isentropic
2. Reversible isothermal
3. Polytropic with n = 1.25.
07
2
Q.4 (a) Draw a neat sketch of p-v diagram for single stage compressor with
clearance.
03
(b) It is required to produce ice from 36
o
water. The capacity of the ice plan
is 6 ton and specific heat of the water is 4.18 KJ/kg.K. Determine the
amount of ice produced in 3 hours.
04
(c) In an ideal Otto cycle the air at the beginning of isentropic compression
is at 1 bar and 15
o
C. The ratio of compression is 8. If the heat added
during the constant volume process is 1000 kJ/kg, determine (a) the
maximum temperature in the cycle, (b) the air standards efficiency (C)
work done per kg of air.
07
OR
Q.4 (a) Draw a neat sketch of p-v diagram showing Free Air Delivery for air
compressor.
03
(b) Calculate the energy consumed in one month for following conditions:
COP of air-conditioning unit : 5
Capacity of air conditioner : 2 TR
No of air conditioners : 8
All air conditioners run for 4 hours/day.
04
(c) A petrol engine with a stroke length of 200 mm and diameter of 150 mm
has a clearance volume of 7 X 10
5
mm
3
. If the indicted thermal
efficiency is 0.30, find the relation efficiency. If the effective pressure is
5 bar and engine runs at 1000 rpm. Find the IP of the engine. take ?=1.4
07
Q.5 (a) Discuss the operational difference between Vapour compression and
Vapour absorption refrigeration cycle
03
(b) Define velocity ratio of pulleys and discuss effect of slip and creep on
motion transmission,
04
(c) Using neat sketch explain the working of Cone clutch and Centrifugal
clutch
07
OR
Q.5 (a) Define following material properties.
1. Ductility
2. Plasticity
3. Malleability
03
(b) Define pitch circle, diametral pitch, addendum and dedendum using neat
sketch.
04
(c) Using neat sketch explain the working of Block brake and Internal
expanding shoe brake.
07
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This post was last modified on 20 February 2020