Question 1 (circle one correct answer): Humidification involves transfer of:
a) water from the liquid phase into the gaseous mixture of air and water vapour, therefore increasing the amount of vapour present in a gas stream
b) gas from the gas phase into the gaseous mixture of air and water vapour, therefore increasing the amount of vapour present in a gas stream
c) solid from the solid phase into the gaseous mixture of air and water vapour d) none of the above
Question 2 (circle one correct answer): In a water cooling tower operation, the water
a) can be cooled to a final temperature below the wet bulb temperature
b) can be heated to its boiling point temperature
c) cannot be cooled to a final temperature below the wet bulb temperature
d) none of the above
Question 1 (circle one correct answer): Humidification involves transfer of: a) water from the liquid phase...
Question 1 A forced draft countercurrent water cooling tower is to cool water from 43.3 to 26.7 C. The air enters the bottom of the tower at 23.9 °C with a wet bulb temperature of 2 °C. The value of H for the flow condition is H 0.533 m the heat transfer resistance in the liquid phase h very high compared to mass transfer coefficient in the gas phase. Calculate the tower height needed if 1.5 times the minimum air...
need an answer for this question, please. thanks.
An existing packed countercurrent water-cooling tower was designed to cool water from 107.6 degree F to 82.4 degree F. The air enters at 82.4 degree F with a wet bulb temperature of 72.5 degree F. The water flow rate is 1900 lb_m water/h.ft^2 and the gas flowrate is 1450 lb_m dry air/h.ft^2. The tower operates at a pressure of 1 atm. Given the overall mass-transfer coefficient (K_ca) is 6.75 lb mol/h.ft^3. Determine...
Quiz 111 ME272 Thermodynamics II Second (Spring Semester) 2019-2020 April 2020 Choose the correct option: 1- The compressibility factors Z are determined assuming that component i exists at the temperature T and pressure p of the mixture, when we specify the mass of component in the mixture. This is according to a) Additive pressure rule b) Kay's rule c) Additive volume rule d) None of the above 2. The ideal gas mixture of combustion gases exhaust from the engine is...
SKMM 2423 QUESTION 4 a) Cold water flows through a metal pipe, which is not insulated The pipe is loc ated in am ambient air, which is at a higher temperature and humidity, What do you think would be observed on the surface of the pipe? Describe briefly the reason for this 5 marks) b) A sling psychrometer shows a dry bulb and wet bulb temperature readings of 25°C and 20°C, respectively. The atmospheric pressure is 101 325 kPa. Using...
For questions (21-36), put a circle around the correct option. In the event that you feel your selected answer is wrong, cross out neatly and circle the correct option. 21. Which of the following statement(s) is/are correct about an adiabatic process: a) it occurs at a constant volume (b) it occurs at both constant temperature and pressure e) it occurs with exchange of heat with its surroundings id None of the above 22. The more stable system with regard to...
1Q) A nitrogen sample occupies 220. mL at STP. If the same sample were collected over water at 25°C and 600. torr, what would be the volume of the gas sample? (Assume that vapor pressure of water at 25°C is 23.8 torr.) Volume =....... mL 2Q) A number of compounds containing the heavier noble gases, and especially xenon, have been prepared. One of these is xenon hexafluoride (XeF6), which can be prepared by heating a mixture of xenon and fluorine...
Question 1: Tick the correct answer from the following: (1) Increasing the Cetane number by using Cetane number enhancers means that (a) Ignition lag is increased (b) Ignition lag is reduced (c) No change in ignition lag (d) None of the above sM (2) Oxy-fuel combustion of a pure hydrocarbon at extremely high temperature avoids the formation of (a) Carbon monoxide (b) Unburned hydrocarbon (c) Carbon dioxide (d) Oxides of nitrogen (3) Since modern engines are of high speed type,...
GOAL Solve a problem involving heat transfer and a phase change from solid to liquid. PROBLEM At a party, 6.00 kg of ice at -5.00°C is added to a cooler holding 30 liters of water at 20.0°C. What is the temperature of the water when it comes to equilibrium? STRATEGY In this problem, its best to make a table. With the addition of thermal energy Dice the ice will warm to 0°C, then melt at 0°C with the addition of...
*SHOW YOUR WORK* (Boyle's Law): 1. What is the final volume (in mL) or argon gas is 50.0 mL at 705 torr is compressed to a pressure of 2.75 atm, at constant temperature? (Lewis Dot Structures): 2. Draw Lewis structures for the following molecules. Include partial charges, AXE designation, (example: AX2 E2), Electron-pair geometry and geometric-molecular shapes. Is it Polar or Non-Polar? CH2Cl2 SO2 3. Which of the following explains why the pressure of a gas increases when the temperature...
Homework week 6 1. How do gaseous, liquid, and solid methanol (CHO) compare in each of the following features: (a) density; (b) the space between the molecules; (c) the attractive force between the molecules? 2. Convert each pressure unit to the indicated unit. a. 3.0 atm to mm Hg b. 720 mm Hg to psi c. 424 mm Hg to atm 3. A sample of nitrogen gas has a volume of 15.0 mL at a pressure of 0.50 atm. What...