calculate if a Briggs and Stratton engine of 208cc is enough to make a 2 seater car (225 to 300 kgs). I don't know the torque of the engine.

: For your selected gears, determine the following: center distance, pitch circle diameter, outer diameter (or addendum diameter), dedendum diameter, base circle diameter, circular pitch, tooth thickness, addendum, dedendum, clearance, whole depth.

Explain the following in corrosion
(a) Redox
(b) Electrolyte

A request has been received from an external customer for recommendations for linear position control sensors to be used in an explosive environment. For this reason unsafe electrical contacts must be avoided. The sensors will be installed in locations that are hazardous to access except when the plant is shut down annually for maintenance. The span required is 5cm. The sensor case must not permit any ingress of dust or of water.

State what type of position sensors you would recommend and give your reasons. Sketch both the recommended sensor and circuit, and explain its operation. Comment on how signal conditioning requirements can now be met. Identify the durability required in respect of dust and water ingress.

In a galvanised steel water supply line 100 m long and 50 mm in diameter, water is pumped from a reservoir to a vented storage tank at an elevation 8 m above it. The following fittings are use: 1 hinged foot valve with strainer, 3 x 90? elbows, 2 gate calves (open), 20 screwed sockets, 1 sudden exit. The water viscosity is 1 x 10-6 m2/s and the density is 1000 kg/m3.

(a) Calculate the friction factor at a flow rate of 3 L/s

(b) Using a constant friction factor as determined in (a), determine the system head equation in terms of velocity.

(c) Using a constant friction factor as determined in (a), determine the system head equation in terms of flow rate in L/s

(d) Using a constant friction factor as calculated in (a), determine the system head and fluid power for flow rates of 0, 1.5, 3, 4.5, and 6 L/s

(e) Draw the graph of system head and fluid power against flow rate on one sheet of graph sheet, using the values calculated in (d)

(f) If the efficiency of the pump is 65% when the flow rate is 5 L/s, determine the input power to the pump at this flow rate.

Heat transfer ( related nuclear engineering a little bit )

I got some Short-answer questions (2~3 sentences)

I want to know that

1) Definition of convective heat transfer coefficient

2) Frequency range of radiation heat transfer

3) Constant temperature condition VS constant heat flux

4) Coupling of equations in natural convection

5) Core acceleration

According to test data, a new type of engine takes in streams of water at 200 °C, 3 bar and 100 °C, 3 bar. The inlet ratio of the mass flow rate of the higher temperature stream to lower temperature stream is 4. A single stream exits at 3.0 bar with a mass flow rate of 5400 kg/h. There is no significant heat transfer between the engine and its surroundings, and kinetic and potential energy effects are negligible. For operation at steady state, determine the maximum theoretical rate that power can be developed, in kW.

A gas undergoes a process from state 1, where p₁ = 60 lbf/in.², v₁ = 6.0 ft³/lb, to state 2 where p₂ = 99.6 lbf/in.², according to pv^1.3 = constant. The relationship between pressure, specific volume, and internal energy is u = (0.2651)pv - 95.436
where p is in lbf/in.², v is in ft³/lb, and u is in Btu/lb. The mass of gas is 10 lb. Neglecting kinetic and potential energy effects, determine the heat transfer, in Btu.

True or False

1. Ceramics often fracture below their theoretical strength due to cracks which concentrate the applied stress.

2. The interstitial diffusion coefficient for a small atom diffusing in a metal is usually larger than its diffusion coefficient via a vacancy mechanism.

3. BCC, HCP, FCC are all Bravais lattices belonging to the cubic crystal system.

4. The larger the number of slip systems available to a metal, the easier it is to deform.

5. HCP has an "abab" stacking sequence, FCC has an "abcabc" stacking sequence.

6. Dislocations move most easily in a crystal along the highest density planes along the lowest density direction.

7. There are 14 Bravais lattices, each of which belongs to one of the 7 crystal systems.

8. Elastic deformation results from the breaking and reforming of bonds.

9. Thermal expansion in crystalline materials is the result of an asymmetry in the repulsive and attractive force curves between pairs of atoms.

10.Graphite and diamond are two different phases of carbon.

Name and briefly explain different heat treatment operations carried on steels.

A regenerative gas turbine with intercooling and reheat operates at steady state (Figure Q2). Air enters the compressor at 100 kPa, 27°C with a mass flow rate of 6 kg/s. The pressure ratio across the two-stage compressor is 10. The pressure ratio across the two-stage turbine is also 10. The intercooler and reheater each operate at 300 kPa. At the inlets to the turbine stages, the temperature is 1127°C. The temperature at the inlet to the second compressor stage is 27°C. Assuming the compressors and turbines stages are reversible systems (100% efficiency). The regenerator effectiveness is 70%. Assuming that there is no pressure loss during intercooling, combustion and reheating process, and by using cold air standard assumption, sketch a T-s diagram for this regenerative Brayton-cycle and determine;

i) the thermal efficiency,

ii) the net power developed (kW),

iii) back work ratio.

Why with decreasing grain size there is decrease in impact transition temperature?

Why does diesel engine initiate 2 stage fuel injection?

What is the reason for that?