DAY 2 (CHEMICAL ENGINEERING
PRINCIPLES) QUESTIONS AND
VERIFIED ANSWERS|100%
CORRECT|GRADE A+
Static Head - ANSWER The pressure in a fluid due to the head of fluid above the point in equation is
Logarithmic - ANSWER The velocity profile for turbulent flow through a closed conduit is
0.401 - ANSWER At a temperature of 366.4 K, the vapor pressure of n-hexane and octane are 1480 and
278 mmHg, respectively. Assume the hexane-octane system obeys raoult's law and the total pressure is 1
atm. Calculate the equilibrium liquid composition (in mole fraction) of the more volatile component.
4.49 kPa - ANSWER Water flows at a velocity of 3.0 m/s. Calculate the dynamic pressure, pd, by assuming
that the density of water, ρ, is 998 kg/m3
1.08 N - ANSWER Determine the force required to move a thin plate of 30 x 60 cm2 size through a liquid
of viscosity μ = 0.05 kg/ms at a velocity of 0.40 m/sec. The liquid is filled between two long parallel
plates as shown in the Figure.
Photovoltaic cell - ANSWER It is a specialized semiconductor diode that converts visible light, infrared or
ultraviolet, radiation into direct current.
16.46 tons - ANSWER A vertical cylindrical tank having a base diameter of 12 m and a height of 5 cm is
fed to the top with water a t 20C. How much water will overflow if the water is heated to 80C?
Itai-itai - ANSWER Characterized by osteomalaecia with severe bone pain associated with renal tubular
dysfunction, what is this disease that is caused by cadmium exposure due to her ma activities related to
industrialization?
3.3 ft/s - ANSWER An oil with a specific gravity of 0.84 and a viscosity of 50 cp is flowing downward in a
vertical pipe of inside diameter 3 in. If the water-oil manometer connected to a pitot tube, as shown in
the figure, shows a reading or 25 in., calculate the average velocity of the flow of oil in the pipe
, 1.57 - ANSWER A piece of glass weighs 258.6 g in air, 152.6 g in water at 4 C and 92 g in sulfuric acid.
Calculate the specific gravity of the sulfuric acid.
11.58 inches - ANSWER Water flows through a galvanized iron pipe at a rate of 3 ft3/s. If the pressure
loss is 5 ft per 1000 ft of flow, determine the size of the pipe.
Friction factor - ANSWER It is the ratio of shear stress at the wall to the product of density and velocity
head
19.6 psia - ANSWER Find the absolute pressure at the bottom of a large open container (see figure)
having oil at the top, and water at the bottom. The height of the vessel is 3.66 m. The water level 2.0 ft
measured from the bottom. The remaining portion is filled with the oil having a density of 917 kg/m3
(0.917 g/m3). Make any relevant assumptions.
None of these - ANSWER A reaction mixture having a Cp=2.85 kJ/kg-K is flowing at a rate of 7260 kg/hr
and is to be cooled from 377.6 K to 344.3 K Cooling water at 288.8 K is available and the flow rate is
45.36 kg/hr The overall Uo is 653 W/m2-L. Calculate the outlet water temperature.
steady-state gain = F(CAin - CA)/(2kVCA) - ANSWER Given the second order rate expression for an
isothermal CSTR Derive the equation for finding the steady-state process gain between F and C.
V dCA/dt = FCAin - FCA - kVCA2
approximately 7.1 x 10^4 - ANSWER Assume frictionless flow in a long horizontal, conical pipe The
diameter is 2.54 cm at one end and 5.08 cm at the other. The pressure head at the smaller end is 4.88 m
of water. If water flows through this cone at a rate of 125.6 ft3/sec, what is the Reynolds number of the
piping system?
211.19 - ANSWER A lab operation results in releasing air containing chloroform into the environment To
remedy this, an absorber is being proposed to scrub the gas using pure water(25 C) and decrease the
chloroform concentration in the air to a permissible 10 ppm. If the air stream (25 C and 1.5 aim) enters
the column at 1000 kmo/hr with 200 ppm chloroform (Assume that each stage operates adiabatically at
1.5 atm , exit flow rate is 1.4 times the minimum value, and exiting components are dilute solution).
What is Henry's law constant (atm/mole fraction) for water at 25 C and 1 atm?
PRINCIPLES) QUESTIONS AND
VERIFIED ANSWERS|100%
CORRECT|GRADE A+
Static Head - ANSWER The pressure in a fluid due to the head of fluid above the point in equation is
Logarithmic - ANSWER The velocity profile for turbulent flow through a closed conduit is
0.401 - ANSWER At a temperature of 366.4 K, the vapor pressure of n-hexane and octane are 1480 and
278 mmHg, respectively. Assume the hexane-octane system obeys raoult's law and the total pressure is 1
atm. Calculate the equilibrium liquid composition (in mole fraction) of the more volatile component.
4.49 kPa - ANSWER Water flows at a velocity of 3.0 m/s. Calculate the dynamic pressure, pd, by assuming
that the density of water, ρ, is 998 kg/m3
1.08 N - ANSWER Determine the force required to move a thin plate of 30 x 60 cm2 size through a liquid
of viscosity μ = 0.05 kg/ms at a velocity of 0.40 m/sec. The liquid is filled between two long parallel
plates as shown in the Figure.
Photovoltaic cell - ANSWER It is a specialized semiconductor diode that converts visible light, infrared or
ultraviolet, radiation into direct current.
16.46 tons - ANSWER A vertical cylindrical tank having a base diameter of 12 m and a height of 5 cm is
fed to the top with water a t 20C. How much water will overflow if the water is heated to 80C?
Itai-itai - ANSWER Characterized by osteomalaecia with severe bone pain associated with renal tubular
dysfunction, what is this disease that is caused by cadmium exposure due to her ma activities related to
industrialization?
3.3 ft/s - ANSWER An oil with a specific gravity of 0.84 and a viscosity of 50 cp is flowing downward in a
vertical pipe of inside diameter 3 in. If the water-oil manometer connected to a pitot tube, as shown in
the figure, shows a reading or 25 in., calculate the average velocity of the flow of oil in the pipe
, 1.57 - ANSWER A piece of glass weighs 258.6 g in air, 152.6 g in water at 4 C and 92 g in sulfuric acid.
Calculate the specific gravity of the sulfuric acid.
11.58 inches - ANSWER Water flows through a galvanized iron pipe at a rate of 3 ft3/s. If the pressure
loss is 5 ft per 1000 ft of flow, determine the size of the pipe.
Friction factor - ANSWER It is the ratio of shear stress at the wall to the product of density and velocity
head
19.6 psia - ANSWER Find the absolute pressure at the bottom of a large open container (see figure)
having oil at the top, and water at the bottom. The height of the vessel is 3.66 m. The water level 2.0 ft
measured from the bottom. The remaining portion is filled with the oil having a density of 917 kg/m3
(0.917 g/m3). Make any relevant assumptions.
None of these - ANSWER A reaction mixture having a Cp=2.85 kJ/kg-K is flowing at a rate of 7260 kg/hr
and is to be cooled from 377.6 K to 344.3 K Cooling water at 288.8 K is available and the flow rate is
45.36 kg/hr The overall Uo is 653 W/m2-L. Calculate the outlet water temperature.
steady-state gain = F(CAin - CA)/(2kVCA) - ANSWER Given the second order rate expression for an
isothermal CSTR Derive the equation for finding the steady-state process gain between F and C.
V dCA/dt = FCAin - FCA - kVCA2
approximately 7.1 x 10^4 - ANSWER Assume frictionless flow in a long horizontal, conical pipe The
diameter is 2.54 cm at one end and 5.08 cm at the other. The pressure head at the smaller end is 4.88 m
of water. If water flows through this cone at a rate of 125.6 ft3/sec, what is the Reynolds number of the
piping system?
211.19 - ANSWER A lab operation results in releasing air containing chloroform into the environment To
remedy this, an absorber is being proposed to scrub the gas using pure water(25 C) and decrease the
chloroform concentration in the air to a permissible 10 ppm. If the air stream (25 C and 1.5 aim) enters
the column at 1000 kmo/hr with 200 ppm chloroform (Assume that each stage operates adiabatically at
1.5 atm , exit flow rate is 1.4 times the minimum value, and exiting components are dilute solution).
What is Henry's law constant (atm/mole fraction) for water at 25 C and 1 atm?
