One Question per Day on Basic Knowledge of Ammonia Production – 30
Thread Content
1. The following statement about nitrogen is incorrect ( ). A. It is an important chemical raw material. B. It can be used as a shielding gas during welding metals. C. It can be used as a ripening agent for fruits. D. It can be used to protect agricultural products such as grains with nitrogen. 2. After being throttled, the superheated steam experiences a decrease in pressure and temperature; its enthalpy value ( ) decreases, while its entropy value increases. A、Decrease, B、Increase, C、Unchanged, D、Either high or low. 3. Which of the following vapors is not superheated vapor? ( ) A. Steam at 0.4 MPa and 300°C, B. Steam at 0.1 MPa and 100°C, C. Steam at 0.4 MPa and 350°C, D. Steam at 0.4 MPa and 450°C. 4. 1 atm is equal to ( ) mmHg, that is, the atmospheric pressure measured at 0°C at sea level. A、76, B、85, C、760, D、780. 5、The ( ) per unit volume of a fluid is called the density of the fluid. A、Mass, B、Weight, C、Volume, D、Pressure. 1. (C), 2. (C), 3. (B), 4. (C), 5. (A).
Time to learn *new knowledge! It’s off to work
There are a few unknowns: bbacb
1、C 2、 C 3、 B 4、 C 5、 A
Answer: B, C, B, C, A
Reply to 1# Yan Qiusheng. 1. Which of the following statements about nitrogen is incorrect? (C) A. It is an important chemical raw material. B. It can be used as a shielding gas during welding metals. C. It can be used as a ripening agent for fruits. D. It can be used to protect agricultural products such as grains with nitrogen. 2. After being throttled, the superheated steam experiences a decrease in pressure and temperature; its enthalpy (A) decreases, while its entropy increases. - K+ @4 T; U% D7 k! P A: Decrease, B: Increase, C: Unchanged, D: Either high or low. 3. Which of the following vapors is not superheated vapor? (B) A. Steam at 0.4 MPa and 300°C, B. Steam at 0.1 MPa and 100°C, C. Steam at 0.4 MPa and 350°C, D. Steam at 0.4 MPa and 450°C. 4. 1 atm is (C) mmHg, that is, the atmospheric pressure measured at 0°C at sea level. 6 X9 X# n’ N$ i5 U* V# f( A A, 76, B, 85, C, 760, D, 780. 5. The (A) possessed by a unit volume of fluid is called the density of the fluid. ; d. B0 L5 n: R/ D4 l! ~6 d A. Mass, B. Weight, C. Volume, D. Pressure.