What are current efficiencies achieved by the following categories of turbomachines?
(a) Wind turbines;
(b) hydraulic turbines;
(c) power plant steam turbines;
(d) aircraft gas turbine engines;
(e) natural gas pipeline compressors;
(f) home vacuum cleaner blowers;
(g) laptop computer cooling fan;
(h) irrigation pumps;
(i) dentist drill air turbines. What is being done to improve these devices?