# IES Mechanical Engineering Online Test

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

Description:

This test will cover topics on FM, Thermo, SOM, HT, Material Science, Production Engg. It will be a multiple choice test. Check out the UPSC IES Mechanical Engineering Coaching for 2013 and Engineering Mathematics for GATE and IES courses by Himanshu as well.

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Discussion

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2119 days 4 hours 30 minutes ago

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2224 days 3 minutes ago

f steam flow trough nozzle we must know if nozzle with constant diameter or not if nozzle with varying diameter the flow isothermal if the nozzle not transfer heat if the nozzle constant diameter the flow constant volume some times you are wrong haw heat transfer science not care for heat and no relation between compression ratio and heat engine

2260 days 15 minutes ago

if steam flow trough nozzle we must know if nozzle with constant diameter or not if nozzle with varying diameter the flow isothermal if the nozzle not transfer heat if the nozzle constant diameter the flow constant volume some times you are wrong haw heat transfer science not care for heat and no relation between compression ratio and heat engine efficiency

3121 days 1 hours 51 minutes ago

if steam flow trough nozzle we must know if nozzle with constant diameter or not if nozzle with varying diameter the flow isothermal if the nozzle not transfer heat if the nozzle constant diameter the flow constant volume some times you are wrong haw heat transfer science not care for heat and no relation between compression ratio and heat engine efficiency

3121 days 1 hours 51 minutes ago

if steam flow trough nozzle we must know if nozzle with constant diameter or not if nozzle with varying diameter the flow isothermal if the nozzle not transfer heat if the nozzle constant diameter the flow constant volume some times you are wrong haw heat transfer science not care for heat and no relation between compression ratio and heat engine efficiency

3121 days 1 hours 51 minutes ago

if steam flow trough nozzle we must know if nozzle with constant diameter or not if nozzle with varying diameter the flow isothermal if the nozzle not transfer heat if the nozzle constant diameter the flow constant volume some times you are wrong haw heat transfer science not care for heat and no relation between compression ratio and heat engine efficiency

3121 days 1 hours 51 minutes ago

if steam flow trough nozzle we must know if nozzle with constant diameter or not if nozzle with varying diameter the flow isothermal if the nozzle not transfer heat if the nozzle constant diameter the flow constant volume some times you are wrong haw heat transfer science not care for heat and no relation between compression ratio and heat engine efficiency

3121 days 1 hours 51 minutes ago

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