ME40345

What is wrong with this requirement:

ESC001 – the electric supercharger shall provide boost to achieve a 10% to 90% engine torque rise time of less than 900 milliseconds at 1500 rpm.

• Shall -> should

• Design details

• Specifying wrong level requirement.

What is wrong with this requirement:

TCB010 – the cooling circuit of the turbocharger shall keep operating after the engine is switched off until the turbocharger is cooled down, to avoid coking in the journal bearing.

• Specifying wrong level requirement

• Design details

• Cool down is not clear

What is wrong with this requirement:

TCC015 – the turbocharger shall limit the turbo-speed under 200,000 rpm using a speed sensor installed in the compressor housing.

• Design details

• Specifying higher level requirement

• Asking for impossible.

What is wrong with this requirement:

CRTC001 – the technician shall be able to access the turbocharger for maintenance without lifting the engine or replacing the front wheels.

• Asking for impossible

• Duplicate requirement

• Use 'will' for customer requirement

What is wrong with this requirement:

R2S010 – the high-pressure stage turbocharger should be controlled by modulating the amount of exhaust gas passing through its turbine

• Design details.

• Not concise

• Should -> shall

In the wind turbine video, the blades are going through which kind of tests?

• Performance

• Durability

On the constant speed curve, compressor surge happens in

• Low mass flow condition

• High mass flow condition

At constant mass flow condition, how to initiate compressor?

• Close the compressor outlet valve

• Open the compressor outlet valve

Close-loop testing sends air from compressor outlet back into compressor inlet, this is to:

• Use wider compressor load range to improve turbine map width.

• Reuse hot and pressured air to reduce energy consumption of gas stand.

Which is the opensource software to conduct 1-D engine simulation:

• OpenCV

• FreeFEM

• OpenWAM

• OpenFoam