Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
B.VOC. -SEMESTER 1(NEW SYLLABUS) EXAMINATION- WINTER 2018
Subject Code: 1110302 Date: 17-01-2019
Subject Name: General Mechanical Engineering II
Time: 10:30 AM to 12:30 PM Total Marks: 50
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1

Define following terms: (any five)
1. Force 2. Weight 3. Pressure 4.Work 5. Power 6. Specific Heat Capacity
05

State first law of thermodynamics. State its limitations.
05
Q.2

Define thermodynamic system. Explain types of system with examples.
05

Explain Carnot Cycle.
05
OR

Derive the equation of workdone of Isothermal Process.
05
Q.3

Expain 4-stroke Petrol engine with neat sketch.
05

Give Difference between 2-stroke and stroke engine.
05
OR
Q.3

During testing of 4 cylinder 2-stroke petrol engine, following data is obtained: Brake Power 24 kW, Mechanical efficiency 80%. Calculate the diameter and stroke of each of the cylinder if L/D 1.5
05

The following reading were taken during the test of two stroke single cylinder petrol engine
Engine torque 650 Nm
Engine speed 400 rpm
Cylinder Diameter 20 cm
Stroke length 30 cm
Fuel consumption 8.5 kg/hr
Mean effective pressure 5.5 bar
Calorific value of the fuel 42500 kJ/kg
Calculate: Mechanical efficiency indicated thermal efficiency brake thermal efficiency.
05
Q.4

Draw only neat sketch of Babcock Wilcox Boiler.
05

Explain in brief any five Pressure Gauge Safety Valve Feed Check Valve Blow off Cock Compression ratio Scavenging Flywheel,
05
OR
Q.4

Define Boiler. Give the difference between Fire tube boiler and Water tube boiler.
05

Explain condensing plant by using its different elements.
05
Q.5

State the Function of Steam Turbine. Classify Steam Turbine.
05

Compare Steam and Gas Turbine.
05
OR
Q.5

Give the difference between Impulse and Reaction Turbine.
05

Explain Working Principle of Gas Turbine and Give the Classification of Open cycle and Closed Cycle Gas turbine.
05