You find a featureless black slab. there are two arms marked in and out. you find that moving the in arm 20 inches causes the out arm to move 5 inches. you find that a 10 lb. pull on in lifts 30 lbs. on out. what is the ama? a. 1
b. 4
c. 3
d. 1/3

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)