7. The pitot tube shown below is placed at a point where the velocity is 2.0 m/s. The specific gravity of the fluid is 2.0, and the upper portion of the manometer contains air. The reading h (m) on the manometer is most nearly:
A. 20.0
B. 10.0
C. 0.40
D. 0.20
8. Conditioned air enters a room at 13°C and 70% relative humidity. The dew-point temperature of the air is most nearly:
A. 5°C
B. 8°C
C. 10°C
D. 13°C
9. A heat exchanger is designed to heat liquid water from 150°C to 190°C inside tubes using steam condensing at 230°C on the outer surface of the tubes. For a constant flow rate, the effect of fouling of the heat transfer surfaces is to
A. increase the temperature rise of the water
B. decrease the temperature rise of the water
C. increase heat exchanger effectiveness
D. make no change in heat exchanger effectiveness
10. A helical compression spring has a spring constant of 38.525 N/mm and a free length of 190 mm. The force (N) required to compress the spring to a length of 125 mm is most nearly:
