FABE 2110 FE Qquestions
A steady, incompressible, two-dimensional velocity field is given by V→=(u,v)=(0.65+1.7x)i→+(1.4−1.7y)j→V→=(u,v)=0.65+1.7xi→+1.4−1.7yj→ where the x- and y-coordinates are in meters and the magnitude of velocity is in m/s. The y-component of the acceleration vector ay is _____. Solve this problem using an appropriate software
c) 2.89y - 2.38
The dynamic viscosity of air at 20 C and 200 kPa is 1.83*10^-5 kg/m*s. The kinematic viscosity of air at this state is
b) 0.77*10^-5 m^2/s
The speed of an aircraft is given to be 950 km/h. If the speed of sound at that location is 315 m/s, the Mach number is
b) 0.84
Water flows in a 15-cm-diameter pipe at a velocity of 1.8 m/s. If the head loss along the pipe is estimated to be 14 m, the required pumping power to overcome this head loss is _____ kW. Solve this problem using appropriate software.
c) 4.37
The pressure in seawater where a submarine is sailing is measured to be 1260 kPa. The submarine is in a water depth of _____.(Take the density of water to be 1000 kg/m3.)
c) 118 m
Water flows in a 10-cm-diameter pipe at a velocity of 1 m/s. Determine the mass flow rate of water in the pipe by using appropriate software.
c) 471 kg/min
A 0.6-mm-diameter glass tube is inserted into water at 20 C in a cup. The surface tension of water at 20 C is sigma s=0.073 N/m. The contact angle can be taken as zero degrees. The capillary rise of water in the tube is
c) 5.0 cm
The weight of a 10-kg mass at sea level is
c) 98.1 N
One J/kg is equal to
1 m^2/s^2
The pressure of water is increased from 100 kPa to 900 kPa by a pump. The temperature of water also increases by 0.15 C. The density of water is 1 kg/L and its specific heat is cp-4.18 kJ/kg*C. The enthalpy change of the water during this process is
1.43 kJ/kg (couldn't find correct answer???)
An ideal gas is compressed isothermally from 100 kPa to 170 kPa. The percent increase in the density of this gas during this process is
a) 70%
The Navier-Stokes equation is also known as _____.
a) Newton's Second Law
Water is withdrawn at the bottom of a large tank open to the atmosphere. The water velocity is 9.5 m/s. Determine the minimum height of the water in the tank by using appropriate software.
a) 4.6 m
A hydroelectric power plant operates at its rate power of 12 MW. If the plant has produced 26 million kWh of electricity in a specified year, the number of hours the plant has operated that year is
a) 2167 h
The brake horsepower and water horsepower of a pump are determined to be 15 kW and 12 kW, respectively. If the flow rate of water to the pump under these conditions is 0.045 m3/s, the total head loss of the pump is _____. (Solve this problem using appropriate software.)
a) 6.7958 m
A person is driving his motorcycle at a speed of 98 km/h in air at 20°C. The frontal area of the motorcycle and driver is 0.75 m2. If the drag coefficient under these conditions is estimated to be 0.90, the drag force acting on the car in the flow direction is _____. (Solve this problem using EES.) Consider the density of air as 1.204 kg/m3.
a) 301 N
The gage pressure in a pipe is measured by a manometer containing mercury (rho=13,600 kg/m^3). The top of the mercury is open to the atmosphere and the atmospheric pressure is 100 kPa. If the mercury column height is 24 cm, the gage pressure in the pipe is
a) 32 kPa
A 0.08-m^3 rigid tank contains air at 3 bar and 127 C. The mass of the air in the tank is
a) 0.209 kg
A viscometer constructed of two 30-cm-long concentric cylinders is used to measure the viscosity of a fluid. The outer diameter of the inner cylinder is 9 cm, and the gap between the two cylinders is 0.18 cm. The inner cylinder is rotated at 250 rpm, and the torque is measured to be 1.2 N⋅m. The viscosity of the fluid is _____ N⋅s/m2. Solve this problem using appropriate software.
a) 0.48
Liquid water vaporizes into water vapor as it flows in the piping of a boiler. If the temperature of water in the pipe is 180 C, the vapor pressure of the water in the pipe is
a) 1002 kPa
The atmospheric pressure in a location is measured by a mercury (ρ = 13,600 kg/m3) barometer. If the height of the mercury column is 770 mm, the atmospheric pressure at that location is _____. Solve this problem using appropriate software.
a) 102.7 kPa
Consider the vertical rectangular wall of a water tank with a width of 5 m and a height of 8 m. The other side of the wall is open to the atmosphere. The resultant hydrostatic force on this wall is
a) 1570 kN
The pressure drop for a given flow is determined to be 120 Pa. For the same flow rate, if we reduce the diameter of the pipe by half, the pressure drop will be _____ Pa. Solve this problem using appropriate software.
a) 1920
In the pump performance curve, the point at which the net head is zero is called the point of _____.
a) free delivery
Engine oil at 20°C flows in a 15-cm-diameter pipe at a rate of 740 L/min. The friction factor for this flow is _____. Solve this problem using appropriate software. Take the density and the dynamic viscosity as 888.1 kg/m3 and 0.8374 kg/m·s, respectively.
b) 0.576
A steady, incompressible, two-dimensional velocity field is given by V→=(u,v)=(2.5−1.6x)i→+(0.7+1.6y)j→V→=(u,v)=2.5−1.6xi→+0.7+1.6yj→ where the x- and y-coordinates are in meters and the magnitude of velocity is in m/s. The x- and y-components of material acceleration ax and ay at the point (x = 1 m, y = 1 m), respectively, in m/s2, are _____. Solve this problem using an appropriate software.
b) -1.44,3.68
The specific gravity of a fluid is specified to be 0.82. The specific volume of this fluid is
b) 0.00122 m^3/kg
The density of a fluid decreases by 3 percent at constant pressure when its temperature increases by 10 C. The coefficient of volume expansion of this fluid is
b) 0.003 K^-1
Water flows in a rectangular open channel of width 0.6 m at a rate of 0.25 m3/s. If the flow depth is 0.2 m, what is the alternate flow depth if the character of flow were to change? (Solve this problem using appropriate software.)
b) 0.35 m
Water flows in a rectangular open channel of width 4.9 m at a rate of 7.5 m3/s. The critical depth for this flow is _____. (Solve this problem using appropriate software.)
b) 0.62 m
Consider water flow through a horizontal, short garden hose at a rate of 38 kg/min. The velocity at the inlet is 1.5 m/s and that at the outlet is 16 m/s. The hose makes a 90° turn before the water is discharged. Disregard the weight of the hose and water. Taking the momentum-flux correction factor to be 1.04 at both the inlet and the outlet, the anchoring force required to hold the hose in place in the vertical direction is _____. Solve this problem using appropriate software.
b) 10.5 N
The pressure in seawater where a submarine is sailing is measured to be 1300 kPa. The submarine is in a water depth of (take the density of water to be 1000 kg/m^3.)
b) 133 m
The pressure of water at atmospheric pressure must be raised to 210 atm to compress it by 1 percent. Then, the coefficient of compressibility value of water is
b) 20,900 atm
Consider water flow through a horizontal, short garden hose at a rate of 34 kg/min. The velocity at the inlet is 1.5 m/s and that at the outlet is 14.5 m/s. Disregard the weight of the hose and water. Taking the momentum-flux correction factor to be 1.04 at both the inlet and the outlet, the anchoring force required to hold the hose in place is _____. Solve this problem using appropriate software.
b) 31.6 N
A vertical rectangular wall with a width of 20 m and a height of 12 m is holding a 7-m-deep water body. The resultant hydrostatic force acting on this wall is
b) 4807 kN
Which quantities are physical phenomena associated with fluid flow over bodies? I. Drag force acting on automobiles II. The lift developed by airplane wings III. Upward draft of rain and snow IV. Power generated by wind turbines
b) I, II, III, and IV
Which of the choices are the examples of an open-channel flow?I. Flow of water in riversII. Draining of rainwater off highwaysIII. Upward draft of rain and snowIV. Sewer lines
b) I, II, and IV
In fluid flow analysis, which boundary condition can be expressed as V⇀fluid=V⇀wallV⇀fluid=V⇀wall ?
b) no-slip
If the fluid velocity is zero in a flow field, the Navier-Stokes equation becomes _____.
b) ∇P−ρg→=0
An ideal gas flows in a pipe at 37 C. The density of the gas is 1.9 kg/m^3 and its molar mass is 44 kg/kmol. The pressure of the gas is
c) 111 kPa
Which is of the highest value?
c) 1 atm
The viscosity of liquids _____ and the viscosity of gases _____ with temperature.
c) decreases, increases
Which choice is the general differential equation form of the continuity equation for a control volume?
c) ∂ρ∂t+∇→⋅(ρV→)=0
A viscometer constructed of two 30-cm-long concentric cylinders is used to measure the viscosity of a fluid. The outer diameter of the inner cylinder is rotated at 250 rpm, and the torque is measured to be 1.4 N*m. The viscosity of the fluid is
d) 0.0049 N*s/m^2
A liquid film suspended on a U-shaped wire frame with a 6-cm-long movable side is used to measure the surface tension of a liquid. If the force needed to move the wire is 0.028 N, the surface tension of this liquid exposed to air is
d) 0.233 N/m
The speed of a spacecraft is given to be 1250 km/h in atmospheric air at -40 C. The Mach number of this flow is
d) 1.13 (IDK correct answer)
In a water distribution system, the pressure of water can be as low as 1.4 psia. The maximum temperature of water allowed in the piping to avoid cavitation is
d) 113 F
The specific gravity of mercury is 13.6. The specific weight of mercury is
d) 133 kN/m^3
Consider a hydraulic car jack with a piston area ratio of 50. A person can lift a 1000-kg car by applying a force of
d) 20 kgf
The atmospheric pressure in a location is measured by a mercury (rho=13,600 kg/m^3) barometer. If the height of the mercury column is 740 mm, the atmospheric pressure at that location is
d) 98.7 kPa
Identify the primary dimensions of kinematic viscosity.
d) L^2/t
The variation of the density of a fluid with temperature at constant pressure is represented by
d) coefficient of volume expansion
The sum of the components of the pressure and wall shear forces in the direction normal to the flow is called _____.
d) lift
Which choice is the incompressible Navier-Stokes equation with constant viscosity?
d) ρDV/Dt=−∇P+ρg+μ∇^2V
It is observed that water at 20 C rises up to 20 m height in a tree due to capillary effect. The surface tension of water at 20 C is sigma s=0.073 N/m and the contact angle is 20 degrees. The maximum diameter of the tube in which water rises is
e) 0.0014 mm
The pressure of water is increased from 100 kPa to 700 kPa by a pump. The density of water is 1 kg/L. If the water temperature does not change during this process, the change of specific enthalpy of the water is
e) 0.6 kJ/kg
The weight of a 1-lbm mass is
e) 1 lbf
A manometer is used to measure the pressure of a gas in a tank. The manometer fluid is water (rho=1000 kg/m^3) and the manometer column height is 1.8 m. If the local atmospheric pressure is 100 kPa, the absolute pressure within the tank is
e) 118 kPa
Consider incompressible, frictionless flow of a fluid in a horizontal piping. The pressure and velocity of a fluid is measured to be 150 kPa and 1.25 m/s at a specified point. The density of the fluid is 700 kg/m3. If the pressure is 142 kPa at another point, determine the velocity of the fluid at that point by using appropriate software.
e) 4.94 m/s
Water is heated from 2 C to 78 C at a constant pressure of 100 Pa. The initial density of water is 1000 kg/m^3 and the volume expansion coefficient of water is B=0.377*10^-3 K^-1. The final density of the water is
e) 971 kg/m^3
The continuity equation is also known as _____.
e) conservation of mass
What is a unit for power?
e) kW
If mass, heat, and work are not allowed to cross the boundaries of a system, the system is called
isolated
The speed of an aircraft is given to be 260 m/s in air. If the speed of sound at that location is 330 m/s, the flight of the aircraft is
subsonic
