6.For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

7.During base load operation, the best method of controlling compressor is

8.For supplying intermittent small quantity of air at high pressure, following compressor is best suited

9.The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called

10.The ratio of isentropic work to euler's work is known as