J-1

A steam turbine carrying full load of 50,000 kw uses 569,000 lb of steam per hr. Engine efficiency is 75 per cent and its exhaust steam is at 1 in. Hg abs and has an enthalpy of 950 Btu per lb. What is the temperature and pressure of the steam at the throttle?

J-2

By actual test after erection how would you check the manufacturer's claimed operating conditions and state what you would expect the efficiency to be for a steam turbine.

J-3

A single-stage turbine of the DeLaval type has a rotor 18 in. in diameter which revolves at 1,200 rpm. The steam jet strikes the buckets at an angle of 20 with the plane of the rotor. It is desired to operate the rotor at 40 per cent of the jet velocity. If exhaust pressure is 14.7 psia and nozzle pressure is 100 psia, what steam temperature is necessary at admission to the nozzle?

J-4

Steam enters the fixed blade of a turbine with a relative velocity of 300 fps, a pressure of 70 psia and 60 superheat. If the steam leaves the blade with a relative velocity of 800 fps and a pressure of 60 psia, find ( a) its specific volume and entropy, ( b) is the blade loss in per cent of available heat drop, and ( c) if better blades were used so that the present loss is only 5 per cent of available heat drop, what...