Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER 1&2 EXAMINATION — SUMMER 2020
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Subject Code: 3110006 Date:06/11/2020Subject Name: Basic Mechanical Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Discuss Closed, Open and Isolated Thermodynamic system with neat sketch. 03
(b) Define the terms: Hardness, Toughness, Ductility, Elasticity 04
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(c) Derive an expression for internal energy for a closed system 07
Q.2 (a) Distinguish between coupling and clutch. 03
(b) Explain Equivalent evaporation and factor of evaporation 04
(c) The heat transfer from a heat reservoir is proportional to its temperature: Justify by deriving equation. 07
OR
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(c) Explain construction and working of centrifugal pump with a neat sketch 07
Q.3 (a) Explain the construction and function of Steam Trap with neat sketch 03
(b) Write the uses of “Steam Tables” 04
(c) 1.5kg of steam at a pressure of 10bar and temperature of 250°C is expanded until the pressure becomes 2.8 bars. The dryness fraction of steam is then 0.9. Calculate change in Internal Energy 07
OR
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Q.3 (a) List different mountings of boiler and explain any one in brief. 03
(b) Derive the equation for air standard efficiency of Otto cycle. 04
(c) A petrol engine with a stroke length of 200 mm and diameter of 150 mm has a clearance volume of 7 X 105 mm3. If the indicated 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 y=1.4 07
Q.4 (a) Discuss with neat sketch Diaphragm pump. 03
(b) Distinguish between Reciprocating and Rotary Compressor. 04
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(c) Discuss the construction and working of four stroke Petrol engine. 07
OR
Q.4 (a) Draw a neat sketch of p-v diagram showing Free Air Delivery for air Compressor. 03
(b) Define the terms ‘Refrigeration’, “Ton of Refrigeration” and “Coefficient of Performance” 04
(c) Calculate the energy consumed in one month for following conditions: COP of air-conditioning unit : 5
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Capacity of air conditioner : 2 TR No of air conditioners : 8All air conditioners run for 4 hours/day. 07
Q.5 (a) What is throttling calorimeter? Explain its limitation 03
(b) Discuss with neat sketch any two boiler accessories. 04
(c) Give comparison between Belt, Chain and Gear drive. 07
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OR
Q.5 (a) How metals are classified? Show with block diagram 03
(b) Define velocity ratio of pulleys and discuss effect of slip and creep on motion transmission 04
(c) Discuss the following with application and Properties: 07
(i) Glass
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(ii) Ceramic(iii) Plastics
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