One Question per Day on Synthetic Ammonia (Series 23)

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Multiple-choice question (fill in the correct option in the brackets) Series 22111. (B-B-004) Mechanical energy includes ( ). (A) Potential energy, external work, thermal energy (B) Potential energy, external work, kinetic energy (C) Potential energy, thermal energy, static pressure energy (D) Internal energy, potential energy, thermal energy. 112. (B-B-004) If the total flow rate remains constant, the pressure drop when two pipes of the same specifications are connected in series is ( ) times that when they are connected in parallel. (A) 0.5 (B) 1 (C) 2 (D) 4113. (B-B-005) Flow in which a fluid moves along lines that are parallel to each other, with no macroscopic mixing with the fluid on the sides, is called ( ). (A) Turbulence (B) Laminar flow (C) Vortex flow (D) Uniform flow 114. (B-B-005) The characteristic of turbulence is that the fluid particles are in ( ). (A) Motion backward (B) Motion perpendicular to the horizontal line (C) Motion in the horizontal direction (D) Motion forward 115. (B-B-005) Experiments show that when Re＞( ), fluid flow is generally turbulent. (A) 5,000 (B) 3,000 (C) 4,000 (D) 2,000 Answer: BDBDC Scoring criteria: 3 points for participation, 8 points for a completely correct answer.