Q1. Steam flow through a nozzle is considered as
Q2. for same compression ratio and for same heat added
Q3. Atkinson gas engine has a special feature
Q4. Substance is flowing in a pipe of 200 mm inside diameter at an average velocity of 3m/sec. At a given section of the pipe line the pressure is 1.5 MN/m2 absolute. What is the flow work of 0.5 cubic meter, expressed in joules passing this section?
Q5. The following is concerend with the combustion of gaseous fuels
Q6. If the compression ratio of an engine working on Otto cycle is increased fro 5 to 7, the %age increase in efficiency will be?
Q7. In a 4 cylinder, 4 stroke, diesel engine operating at 1200 rpm, the duration of fuel injection is 20 degrees. The time in seconds during which fuel is injected would be
Q8. Which is correct statement about the reaction time for autoignition of fuel and the fuel air ratio?
Q9. The saturation temperature of steam with increase in pressure increases
Q10. The equivalent evaporation of a boiler is a measure to compare
Q11. Sublimation region is the region where
Q12. On a Mollier chart, free expansion from high pressure to atmosphere is represented by
Q13. A fusible plug is fitted in small boilers in order to
Q14. The major axis of an elliptical manhole on the shell should be provided
Q15. An economiser in a boiler
Q16. In order to increase the thermal efficiency of aircraft jet engines, use is made of
Q17. 2. A spherical steel ball of 12 mm diameter is initially at 1000 K. It is slowly cooled in surrounding of 300 K. The heat transfer coefficient between the steel ball and the surrounding is 5/Wm2K. The thermal conductivity of steel is 20 /WmK. The temperature difference between the centre and the surface of the steel ball is
Q18. In a variable speed SI engine, the maximum torque occurs at maximum
Q19. An aircraft flying horizontally at a speed of 900 km/h is propelled by a jet leaving the nozzle at a speed of 500 m/s. The propulsive efficiency is
Q20. A ship model 1/60 scale with negligible friction is tested in a towing tank at a speed of 0.6 m/s. If a force of 0.5 kg is required to tow the model, the propulsive force required to tow the ship will be
Q21. A parachutist has a mass of 90 kg and a frontal area of 0.30 m2 in free fall. The drag coefficient based on frontal area is found to be 0.75. If the air density is 1.28 kg/m3, the terminal velocity of the parachutist will be
Q22. Heating the hypoeutectoid steels to 30 degrees celcius above the upper critical temperature and then cooling slowly to room temperature to form pearlite and ferrite structure, is known as
Q23. A helical spring has N turns of coil of diameter D, and a second spring, made of same wire diameter and same material, has N/2 turns of coil dia 2D. if the stiffness of the first spring is k, then the stiffness of the second spring is
Q24. Which one of the following features improves the fatigue strength of a metallic material?
Q25. A thin cylinder contains fluid at a pressure of 500 N/m2, the internal diameter of the shell is 0.6 m and the tensile stress in material is limited to 9000 N/m2. the shell must have a minimum wall thickness of nearly
Q26. Pearlite consists of
Q27. A masss is suspended at the bottom of two springs in series having stiffness of 10N/mm and 5N/mm. The equivalent spring stiffness of the two springs is nearly
Q28. The gross head on a turbine is 300 m. The length of penstock supplying water is 400 m. the diameter of the penstock is 1m and the velocity of water through penstock is 5m/s. If the coefficient of friction is 0.0098, the net head on the turbine would be, nearly
Q28. The gross head on a turbine is 300 m. The length of penstock supplying water is 400 m. the diameter of the penstock is 1m and the velocity of water through penstock is 5m/s. If the coefficient of friction is 0.0098, the net head on the turbine would be, nearly
Q29. In fluid machinery, the relationship between saturation temperature and pressure decides the process of
Q30. The main purpose of Chaplets is