We place a 3.4 cm-tall circular object in front of an unknown lens and observe a 2.4 cm-tall circular image on a screen. We move the object either towards or away from the lens. The circular image moves 2.2 cm either towards or away from the lens; the new image is 5.7 cm tall.

a) Is the lens converging or diverging? Do you move the object towards or away from the lens? Does the image move towards or away from the lens? Explain!

b) Use ray tracing to find the focal length of the lens and the location of the lens! use empty next page!

c) Use ray tracing to find the two locations of the object that produce the two images. How much do we move the object?

A 4 cylinder 4 stroke 2.3 L diesel engine with bore = 12.4 cm and stroke =11 cm. the crank radius is 6.2 cm and with a connecting rod length 15 cm. the compression ratio of the engine is 20 and the combustion efficiency is 97.3 %. If the average speed of the car over the running life of the engine is 56 km/h and the total traveled distance of the engine is 250000 km. note: use the engine speed as 2300 rpm whenever needed, mechanical efficiency is 73 %, indicated work produced from each cycle each cylinder is 1400J, and assume that the injection started 10 degrees bTDC and ends at 25 crank angle degree aTDC.

Determine:

1. The volume of the BDC.
2. The amount of the fuel that didn’t burned in the combustion chamber .
3. The rate of the air flow to the engine if the volumetric efficiency is 70 %.
4. The number of the exhaust strokes that have been happened during the engine life in one cylinder.
5. Indicated mean effective pressure.
6. The torque produced from the engine.
7. The time duration for the injection process.
8. The position of the piston at the end of the injection period.
9. The volume of the combustion chamber at the moment of the injection process.
10. If the mass floe rate of the fuel used if A/F is 19.3 kgair/kgfuel.
11. The specific power of the engine.
12. Based on the dimensions of the bore and the stroke, is this engine square engine or over or under square one?

Air enters the turbine of a gas turbine at 1400 kPa, 1400 K, and expands to 100 kPa in two stages. Between the stages, the air is reheated at a constant pressure of 350 kPa to 1400 K. The expansion through each turbine stage is isentropic.

Determine:

(b) the heat transfer for the reheat process, in kJ/kg of air flowing.

(c) the increase in net work as compared to a single stage of expansion with no reheat.

hi please elaborate axial flow pumps working principle with labelled and the flow image , application and limitation .

Hello! In Ansys Fluent, how can I calculate the molar concentration (kmol/m^3) of a species and molar fraction (dimensionless) of a species in fluent after I put an exact amount of the mass (kg) of a species at a boundary? Thank you, I will thumb you up!

Make a mindmap that contain:

a- Relationship between Mechanical Energy Equation and internal flow analysis.

b- Flow regimes - Search on the turbulent, laminar and transitional flow regimes. Describes them and give example when/where they occurs.

c- Region in pipe flow - Search on hydrodynamic entrance length, boundary layer region/viscous flow region, hydrodynamically developing region and hydrodynamically fully developed region. Describes them and show how to calculate them.

Give two practical examples for following concepts/principles. Also write where these are used with brief explanation: (a) Centroid (b) Moment of inertia (c) General plane motion (d) Work energy principle (e) Impulse-momentum principle

Maximum load capacity: 50,000 N Test rate: 3 mm/min - 0.05 mm/s Steel A Steel B Initial length, Lo 40 mm 40 mm Initial diameter, do 6 mm 6 mm Final length, Lf 48 mm 52 mm Final diameter, df 4.2 mm 3.1 mm  

From the data given in excel file, calculate:

(b) Tensile strength, modulus of elasticity, modulus of resilience, % elongation and % reduction in area.

(c) Plot both engineering stress strain curve and true stress strain curve.

(d) Compare the tensile behaviour of steel A and B in one paragraph

For an ideal gas-turbine cycle with two stages of compression and two stages of expansion, the pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1200K. Using variable specific heats, determine the back work ratio and the thermal efficiency of the cycle, assuming

(a)no regenerator is used,

(b)a regenerator with 75% effectiveness is used.

Write a detailed understanding about the history, current trends and future research of 'Ground Support Vehicles for Guided Missile Programme' pertaining to India and also the international scenario. Include case studies.

As a person serving in the role of a safety practitioner, how would you explain to a new worker the difference between engineering and administrative controls and how they relate to a specific work environment? Be specific in your response, and include examples of your work environment.

A single-cylinder, four stroke research engine operates on Otto cycle. The specification
of the engine is shown as below:-
Displacement volume of the cylinder = 540 cm3
Clearance volume of the cylinder = 60 cm3
Minimum temperature = 200°C
Minimum pressure = 200 kPa
Net work output = 1000 kJ/kg
Sketch the process on a P-V diagram and by using constant specific heat at room
temperature, determine:
i) the temperature and pressure at each process,
ii) the thermal efficiency of the engine, and
iii) the Mean Effective Pressure (MEP).

An Otto Cycle engine operation at cold-air standard has a volume of 0.1908 at the beginning of isentropic compression. If the compression ratio is 12.5, how much heat is released from the fuel per kg of fuel burned if the fuel consumption is 0.02 kg/min? The mean effective pressure is 350kPa.

heat transfer question, show equations, assumptions, calculations and steps clearly. will give thumbs up rating if solved correctly in 30 minutes

Define thermal diffusivity (α) and give its mathematical expression.