engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Power Engineering Steam Turbine Nozzle and Diffuser
Consider an isentropic flow of air (ratio of specific heats = 1.4) through a duct as shown in the figure.
The variations in the flow across the cross-section are negligible. The flow conditions at Location 1 are given as follows:
𝑃1 = 100 kPa, 𝜌1 = 1.2 kg/m3 , 𝑢1= 400 m/s
The duct cross-sectional area at Location 2 is given by A2 = 2A1, where A1 denotes the duct cross-sectional area at Location 1. Which one of the given statements about the velocity 𝑢2 and pressure 𝑃2 at Location 2 is TRUE?
1
𝑢2 < 𝑢1 , 𝑃2 < 𝑃1
2
𝑢2 < 𝑢1 , 𝑃2 > 𝑃1
3
𝑢2 > 𝑢1 , 𝑃2 < 𝑃1
4
𝑢2 > 𝑢1 , 𝑃2 > 𝑃1