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REVIEWER FOR EXAMINATION, Cheat Sheet of Mathematics

University of the Philippines Baguio (UPB)Mathematics

REVIEWER FOR EXAMINATION TO PASS

Typology: Cheat Sheet

2023/2024

Uploaded on 06/11/2024

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Quiz # 8 Momentum and Heat Transfer
ChE 556: ChE Practice with Comprehensive Examination
Name:_______________________________ SR Code: ________ Date:_______
DIRECTIONS: Write the letter of the best answer on the answer sheet provided. Strictly NO Erasures. Good luck!
1. A flow measurement instrument that measures point velocities
a. pitot tube b. venturi meter c. orifice meter d. flow-nozzle meter
2. Fluid flow is ________ when the Froude # is greater than 1.
a. subcritical b. critical c. supercritical d. sonic
3. The total energy entering the system must be _______ the total energy leaving the system
a. less than b. equal to
c. greater than d. depends on the operating conditions
4. An increase in temperature of the liquid causes _________ in its density
a. an increase b. no change
c. a decrease d. depends on system pressure
5. and __________ in its viscosity.
a. an increase b. no change
c. a decrease d. depends on system pressure
6. The Poiseuille equation is applicable for
a. laminar flow only b. turbulent flow only
c. both laminar and turbulent flow d. critical flow only
7. A head of 14 m is approximately equal to
a. 1.4 bar b. 1.4 barg c. 1.4 Pa d. 0.014 kPag
8. It describes the resistance of a duct, channel, pipe, elbow, bends and other obstructions to flow expressed in the
length of the straight pipe.
a. Frictional length b. equivalent length c. fitting loss length d. None of these
9. It is the formation of gas bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapor
pressure.
a. Cavitation b.surge c. Hammering d. Vaporization
10. It refers to the difference between the total absolute suction pressure at the pump suction nozzle when the pump
is running and the vapor pressure at the flowing liquid temperature.
a. NPSHa b. NPSH c. NPSHr d. None of these
11-13. A liquid, with a density of 660 kg/m3 and a vapor pressure of 1870 kPaA, flows from a vessel (P = 2150
kPaA) to a column (P = 2300 kPaA). Pipe from the vessel to the column is divided into 5 segments.
Segment A: from vessel to strainer
Segment B: from strainer to pump suction
Segment C: from pump discharge to orifice flow meter
Segment D: from orifice flow meter to control valve
Segment E: from control valve to column feed nozzle
Vessel elevation is 7.0 m, Pump elevation is 1.0 m, and Column feed nozzle elevation is 30.0 m.
Friction losses are as follows:
per segment = 5 kPa
strainer = 5 kPa
orifice flow meter = 20 kPa
control valve = 70 kPa
11. Calculate pump head in meters.
a. 325 m b. 65 m c. 235 m d. 56 m
12. Calculate available NPSH in meters.
a. 4 m b. 46 m c. 5 m d. 64 m
13. If the required NPSH is 4m and available NPSH should be at least 1 m above the required NPSH, is the available
NPSH acceptable?
Page 1 of 3
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ChE 556: ChE Practice with Comprehensive Examination Name:_______________________________ SR Code: ________ Date:_______ DIRECTIONS : Write the letter of the best answer on the answer sheet provided. Strictly NO Erasures. Good luck!

  1. A flow measurement instrument that measures point velocities a. pitot tube b. venturi meter c. orifice meter d. flow-nozzle meter
  2. Fluid flow is ________ when the Froude # is greater than 1. a. subcritical b. critical c. supercritical d. sonic
  3. The total energy entering the system must be _______ the total energy leaving the system a. less than b. equal to c. greater than d. depends on the operating conditions
  4. An increase in temperature of the liquid causes _________ in its density a. an increase b. no change c. a decrease d. depends on system pressure
  5. and __________ in its viscosity. a. an increase b. no change c. a decrease d. depends on system pressure
  6. The Poiseuille equation is applicable for a. laminar flow only b. turbulent flow only c. both laminar and turbulent flow d. critical flow only
  7. A head of 14 m is approximately equal to a. 1.4 bar b. 1.4 barg c. 1.4 Pa d. 0.014 kPag
  8. It describes the resistance of a duct, channel, pipe, elbow, bends and other obstructions to flow expressed in the length of the straight pipe. a. Frictional length b. equivalent length c. fitting loss length d. None of these
  9. It is the formation of gas bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapor pressure. a. Cavitation b.surge c. Hammering d. Vaporization
  10. It refers to the difference between the total absolute suction pressure at the pump suction nozzle when the pump is running and the vapor pressure at the flowing liquid temperature. a. NPSHa b. NPSH c. NPSHr d. None of these 11-13. A liquid, with a density of 660 kg/m3 and a vapor pressure of 1870 kPaA, flows from a vessel (P = 2150 kPaA) to a column (P = 2300 kPaA). Pipe from the vessel to the column is divided into 5 segments. Segment A: from vessel to strainer Segment B: from strainer to pump suction Segment C: from pump discharge to orifice flow meter Segment D: from orifice flow meter to control valve Segment E: from control valve to column feed nozzle Vessel elevation is 7.0 m, Pump elevation is 1.0 m, and Column feed nozzle elevation is 30.0 m. Friction losses are as follows: per segment = 5 kPa strainer = 5 kPa orifice flow meter = 20 kPa control valve = 70 kPa
  11. Calculate pump head in meters. a. 325 m b. 65 m c. 235 m d. 56 m
  12. Calculate available NPSH in meters. a. 4 m b. 46 m c. 5 m d. 64 m
  13. If the required NPSH is 4m and available NPSH should be at least 1 m above the required NPSH, is the available NPSH acceptable?

ChE 556: ChE Practice with Comprehensive Examination a. No, since it is only equal to the NPSHr. There is no design margin. b. Yes, since it satisfies the requirement. c. Yes, since it is exactly 1 m above the NPSHr. d. No, since it is too hign above the requirement. 14-17. Data Provided: Fluid: Water Flow rate: 1.4 m^3 /s Density: 998 kg/m Viscosity: 1.01 cP Friction Factor: 0. Pipe diameter: 20 inches (Use 1inch = 25mm) Wall thickness: 10 mm

  1. Determine the fluid velocity in m/s. a. 7.74 m b. 4.77 m c. 7.47 m d. 4.74 m
  2. Determine the delta P/100m in kPa. a. 34. 97 kPa b. 7.473 kPa c. 74.73 kPa d. 94.37 kPa
  3. Determine rho-v2. a. 59800 b. 95800 c. 85900 d. 89500
  4. If the client criteria for delta P /100m is between 20 - 90 kPa, what would you suggest. a. Retain the current pipe diameter 20 inches. b. Change the pipe diameter to a larger size, 30 inches. c. Change the pipe diameter to a smaller size, 18 inches. d. Change the pipe diameter to a larger size, 36 inches.
  5. Predict delta P/100 m in bar of a cooling water line after increasing the capacity while retaining the pipe line size. Original cooling water flow rate is 2500 ton/h, having a delta P/100 m of 0.0947 bar. New cooling water flow rate is 3000 ton/h. a. 0.136 b. 0.114 c. 0.0789 d. 0.
  6. Steam flows from an 8" line, passes through an expander, to a 10" line. Steam properties at the 8" line are as follows: Pressure = 5.00 barG, Temperature = 180 deg-C, density = 2.994 kg/m3, flow rate = 8,500 kg/h, delta P/ m = 0.257 bar. Calculate the velocity upstream of the expander. a. 0.1025 m/s b. 0.2510 m/s c. 15.06 m/s d. 1.056 m/s
  7. From the previous problem, calculate the delta P/100 m in the 10" line. a. 0.2481 bar b. 0.0842 bar c. 0.7843 bar d. 0.1053 bar
  8. In a fluid, if the currents are set in motion by the action of a mechanical device, and the flow is independent of the density gradients, the phenomena is called a. Natural Convection b. Forced Convection c. Thermal Conduction d. Centrifugation
  9. The spectral distribution of a perfect emitter has a maximum and that the corresponding wavelength depends on temperature. The maximum spectral emissive power is displaced to shorter wavelengths with increasing temperature. These statements refer to: a. Wien’s Law b. Stefan-Boltzman Law c. Kirchoff’s Law d. Planck’s Law
  10. The amount of radiation emitted in all directions and over all wavelengths by a perfect emitter is proportional to the fourth power of the absolute temperature of the emitter. This is the statement of a. Wien’s Law b. Stefan-Boltzman Law c. Kirchoff’s Law d. Planck’s Law
  11. In an evaporator, the boiling point of the solution is related to the pressure of the system. The temperature at boiling is __________ with higher operating pressure. a. Higher b. Lower c. The same d. None of the above
  12. __________ evaporator involves the introduction of raw feed and the withdrawal of product at each effect of the evaporator. It is used primarily when the feed is substantially saturated an the product is a solid.