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Farm Machinery Practice Test: Internal Combustion Engine
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Avg score: 55% • Most missed: “Rapid explosion of air-fuel mixture within the cylinder, when ignited by a spark…”

Internal Combustion Engine topics include: IC engine components and working, 2-stroke and 4-stroke engines working principles, comparision between diesel and petrol engine, heat engine types, engine power terminology, comparision between 4-stroke and 2-stroke engines.
 

Farm Machinery Practice Test: Internal Combustion Engine
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25 Questions

1. What is the stroke-bore ratio for tractor engines?
2. What is the formula of controlling force (Fc) of a governor?
3. If a diesel engine has a compression ratio of 24 and the cut-off takes place at 5% of stroke, the air standard efficiency will be ___________
4. Which engine is designed to convert chemical energy of heavier fuel oil into mechanical energy?
5. The pipe which connects the intake system to the inlet valve of the engine and through which air or air-fuel mixture is drawn into the cylinder is known as _______
6. What is the formula for specific fuel consumption (i.s.f.c.)?
7. Which of the following is not a feature of the spark plug?
8. A diesel tractor consumes 5 litres per hour of fuel whose density is 0.836 kg per litre. The heating value of the fuel is 45.4 MJkg-1. If the thermal efficiency of the engine is 0.30, the transmission efficiency is 0.90 and the tractive efficiency is 0.75, the drawbar power of the tractor will be __________
9. Which of the following is not a feature of diesel engine?
10. Which of the following is not an example of drawbar dynamometer?
11. A cylinder can withstand the L.P.G. at 16.7 atmospheric pressure, if at any time instant the inside pressure of L.P.G. becomes 13 atmosphere pressures at 27°C. Then what will be the temperature at which it will explode?
12. A four cylinder two- stroke cycle engine with a swept volume of 750 cm3 per cylinder gives a specific fuel consumption of 0.25 kg KW-1 h-1. When developing a brake mean effective mean pressure 650 kPa at 1500 rpm. What is the brake thermal efficiency, if the calorific value is 40 MJ kg-1?
13. 1 kg of air is compressed from 40 m3 volume under 100 kPa pressure to 1 m3 volume. What will be the pressure at constant temperature?
14. What is the degree of crank rotation during the completion of a four-stroke cycle?
15. Which of the following is an indicator of the combustion speed of diesel fuel and compression needed for ignition?
16. A four-stroke diesel engine operating at 1200 rpm uses 0.1 kg of fuel in 5 minutes and has the brake specific fuel consumption equals to 0.1910 kg\BHP\h. Calculate the torque developed.
17. Which of the following is not a function of a flywheel?
18. Which is largest piston driven aircraft having 36 cylinders?
19. What is the firing order of a four cylinder engines?
20. Which of the following stages is the last stage of the combustion process in diesel engine?
21. A four-cylinder tractor engine develops 50 KW at 3000 engines when tested on a prony dynamometer on brake arm length of 96 cm. What is the torque?
22. What is the regulation of speed when speed at no load of engine is 1973 rpm and speed at load is 1873 rpm?
23. What is the compression ratio of an engine whose dimensions are 100*120 mm and length of clearance space at the top dead centre being 8 mm?
24. Who found the working principle of compression ignition engine in 1982?
25. What is the quantity of water which is to be circulated through the radiator, if diesel tractor developed 80 KW with coolant temperature difference 5.5° C?

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