What is an advantage of having two oxygen regulators on a machine-cutting torch?

a. It allows the cutting pressure to be adjusted without affecting the torch flame.
b. It makes it possible to change cylinders during a cut without stopping the cut.
c. It makes it easier to light the torch.
d. It allows air to be used instead of oxygen for the flame.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

List 3 options on how to reduce knocking problens during engine process,

1kg of water contained in a piston-cylinder assembly undergoes two processes in series from an initial state where the pressure is 3.0 bar and the temperature is 150°c process 1-2: the water is compressed isothermally to a volume of 0.25 m^3 with 120 kj of work being done to the system. process 2-3: the water is heated at constant volume to a final pressure of 10 bar. a. find the change in internal energy for the system. b. calculate the amount of heat transferred, in kj. c. sketch both processes on a t-v diagram. (196.33 kj/kg, 76.33 kj)