1 Which of the mechanisms can be used to: a. Increase torque and decrease speed?

b. Increase speed and decrease torque?

c. Keep constant speed and torque?

d. Transmit rotary movement at a 90° angle?

e. Reverse the flow of power?
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I need an answer to all of these for some background it’s about windmills

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2