In a stadium, fans stand up and sit down to produce a wave across the stadium. this type of wave where the material travels perpendicular to the direction of travel of the the wave. which type of wave does this describe?

a) mechanical wave.
b) transverse wave.
c) longitudinal wave.
d) electromagnetic wave.

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)