II. Basic Engineering Flashcards
The study that deals with fluids at rest such as those fluids like coconut oil, milk, etc.
a. Hydrodynamic
b. Hydrostatic
c. Hydro pneumatic
d. None of the above
b. Hydrostatic
The study that deals with the various factors affecting the relationship between the rate of flow of fluid and the various pressures tending it to cause or inhibit its flow.
a. Hydrodynamic
b. Hydrostatic
c. Hydro pneumatic
d. None of the above
a. Hydrodynamic
Which of the following resources are considered fluid?
a. Biogas
b. Producer gas
c. Bioethanol
d. Coconut oil
e. Sugar cane juice
f. All of the above
g. None of the above
f. All of the above
Which of the following resources are not fluid?
a. Biomass
b. Grains and Cereals
c. Fruits and vegetables
d. All of the above
d. All of the above
What is the mass flow rate of coconut oil in a 2-in. pipe if the velocity of the fluid is measured at 0.02 m/s? The specific weight of oil is 1500 kg/m3.
a. 3.54 kg/sec
b. 3.13 kg/sec
c. 2.35 kg/sec
d. None of the above
c. 2.35 kg/sec
Newton’s law of motion states that:
a. Everybody continues in a state of rest or of uniform motion in a straight line unless compelled by force to change that state.
b. The rate of change of momentum is proportional to the force applied and took place in the direction of the force application.
c. To every action there is always an equal and opposite reaction.
d. All of the above
d. All of the above
Mass flow rate states that:
a. The rate of flow of fluid is constant at any point in the system and there is no accumulation or depletion of fluid within the system.
b. The rate of flow of fluid is not constant at any point in the system and there is accumulation or depletion of fluid within the system.
c. The rate of flow of fluid increases at any point of the system and there is accumulation and no depletion within the system.
d. None of the above
a. The rate of flow of fluid is constant at any point in the system and there is no accumulation or depletion of fluid within the system.
Fluids include ___.
a. solid, gas, and liquid
b. gas and liquid
c. liquid
d. All of the above
b. gas and liquid
The characteristic of agricultural products that determines the angle by which it will move freely by gravity with respect to the material in which it is held, such as hopper bottom of a storage bin structure.
a. Angle-of-repose
b. Angle-of-friction
c. Angle-of-slide
d. None of the above
b. Angle-of-friction
This refers to the characteristics of fluid that is linearly related to shear force.
a. Newtonian fluid
b. Non-Newtonian fluid
c. All of the above
d. None of the above
a. Newtonian fluid
An example of Newtonian fluid.
a. Coconut oil
b. Butter
c. Slurries
d. None of the above
a. Coconut oil
This refers to the characteristics of fluid not linear with the shear force.
a. Newtonian fluid
b. Non-Newtonian fluid
c. All of the above
d. None of the above
b. Non-Newtonian fluid
An example of Non-Newtonian fluid.
a. Purees
b. Jathropha oil
c. Coconut water
d. None of the above
a. Purees
This refers to the internal resistance of fluid to shear.
a. Viscosity
b. Coefficient-of-friction of fluid to fluid
c. All of the above
d. None of the above
c. All of the above
Reynolds number is a function of the ___.
a. inside diameter of the pipe
b. velocity of fluid inside the pipe
c. specific weight of the fluid
d. fluid viscosity
e. All of the above
f. None of the above
e. All of the above
Reynolds number equation.
a. Re = DVδ/μ
b. Re = DV/μ
c. Re = DV/δμ
d. None of the above
a. Re = DVδ/μ
When fluids flow in elemental swirl or eddies, it is classified as ___.
a. turbulent flow
b. laminar flow
c. mixture of laminar and turbulent flow
d. None of the above
a. turbulent flow
When fluids flow in parallel elements, it is classified as ___.
a. turbulent flow
b. laminar flow
c. mixture of laminar and turbulent flow
d. None of the above
b. laminar flow
Which of the following factors affect the flow of fluid in pipes?
a. Characteristics of fluid
b. Size of pipe
c. Shape of pipe
d. Condition inside the surface of the pipe
e. Fluid velocity
f. All of the above
g. None of the above
f. All of the above
Which of the following statements is true?
a. The velocity of fluid flowing in a pipe is highest at the center and decreases towards its surfaces.
b. The velocity gradient for streamlined flow in a long circular conduit is parabolic in shape.
c. The velocity gradient for turbulent flow flattens and the relationship between the maximum and the average velocity changes.
d. All of the above
e. None of the above
d. All of the above
The angle formed by agricultural product itself with respect to the horizontal axis which varies with the moisture content and the amount of foreign matter.
a. Angle-of-repose
b. Angle-of-friction
c. Angle-of-slide
d. None of the above
a. Angle-of-repose
A simple device used to measure pressure by taking the difference in the height of fluid inside a tube.
a. Pyschrometer
b. Hydrometer
c. Manometer
d. None of the above
c. Manometer
The pressure taken from the direction of fluid which is also the pressure resulting from force due to change in velocity of the fluid.
a. Static pressure
b. Dynamic pressure
c. Isothermic pressure
d. None of the above
b. Dynamic pressure
The pressure taken perpendicular from the direction of fluid where sample application of which is taking the velocity of flow of fluid in pipes using pitot-tube manometer.
a. Static pressure
b. Dynamic pressure
c. Isothermic pressure
d. None of the above
a. Static pressure
The unit of pressure.
a. Psi
b. Inches of water
c. Inches of mercury
d. All of the above
e. None of the above
d. All of the above
The plenum chamber of a flatbed dryer registers 2 inches of water. How much is the equivalent pressure of the chamber in psig?
a. 0.072 psig
b. 1.201 psig
c. 1.537 psig
d. None of the above
a. 0.072 psig
High pressure is usually expressed in ___.
a. psi
b. inches of water
c. inches of mercury
d. All of the above
e. None of the above
a. psi
Low pressure is usually expressed in ___.
a. psi
b. inches of water
c. inches of mercury
d. All of the above
e. None of the above
b. inches of water
Very low pressure is usually expressed in ___.
a. psi
b. inches of water
c. inches of mercury
d. All of the above
e. None of the above
c. inches of mercury
In fluid mechanics, the total hydraulic energy is the sum of ___ energy plus the work supplied by the pump or blower less friction (conduit and fittings) in the system.
a. potential and kinetic
b. pressure and kinetic
c. potential, kinetic, and pressure
d. None of the above
c. potential, kinetic, and pressure
An open tube pointing to the direction of flow of the fluid that is usually used with manometer to measure static and dynamic pressures.
a. Pitot-Tube
b. Orifice
c. Weir
d. None of the above
a. Pitot-Tube
Which of the following instruments can measure the flow of fluid?
a. Pitot tube
b. Venturi meter
c. Hot wire anemometer
d. All of the above
e. None of the above
d. All of the above
Which of the following fluids is considered as highly incompressible?
a. Flue gases
b. Biogas
c. Vegetable oil
d. All of the above
c. Vegetable oil
Which of the following fluids is considered as compressible?
a. Producer gas
b. Vegetable oil
c. Molasses
d. None of the above
a. Producer gas
The mass flow rate equation:
a. Q = AVδ
b. Q = AV
c. Q = Aδ
d. None of the above
a. Q = AVδ
The available energy due to the elevation above a reference plane.
a. Pressure Energy
b. Kinetic Energy
c. Potential Energy
d. None of the above
c. Potential Energy
The available energy due to the internal pressure.
a. Pressure Energy
b. Kinetic Energy
c. Potential Energy
d. None of the above
a. Pressure Energy
The energy available from moving fluids.
a. Pressure Energy
b. Kinetic Energy
c. Potential Energy
d. None of the above
b. Kinetic Energy
The process which results in the diffusion of substances from the region of high concentration to the region of low concentration.
a. Energy transfer
b. Mass transfer
c. Heat transfer
d. None of the above
b. Mass transfer
The amount of heat transfer from within the product.
a. Thermal diffusivity
b. Thermal conductivity
c. Thermal expansion
d. None of the above
b. Thermal conductivity
*A coconut oil is to be pumped into a 6m-high tank from the pump at 100 kg per minute rate. The container where the oil is contained is located 1 m below the pump. The estimated dynamic head loss in the system is 0.2 m of water. What is the horsepower required to pump the oil?
a. 0.158 hp
b. 0.175 hp
c. 0.200 hp
d. None of the above
**Assuming a 0.93 kg/l specific weight of oil, what is the brake horsepower required for the pump above if the pump efficiency is 60%?
a. 0.175 hp
b. 0.263 hp
c. 0.312 hp
d. None of the above
a. 0.158 hp
b. 0.263 hp
What is the horsepower required for the motor if the transmission and motor efficiencies are 80% and 90%, respectively?
a. 0.360 hp
b. 0.451 hp
c. 0.514 hp
d. None of the above
a. 0.360 hp
*A rotary pump is used in pumping vegetable oil to a tank at a rate of 1 gpm. The pump is driven directly by an electric motor with 1.5-hp input power running at a speed of 1700 rpm. The total head loss of the system is 10 m. If the motor drives the pump at 2200 rpm, what is the rate of flow of the pump?
a. 1.294 gpm
b. 1.357 gpm
c. 2.186 gpm
d. None of the above
**What is the change in the total head delivered by the pump in item above?
a. 14.57 m
b. 15.32 m
c. 16.75 m
d. None of the above
***What would be the increase in the input power of the pump in item above?
a. 3.25 hp
b. 4.56 hp
c. 5.34 hp
d. None of the above
a. 1.294 gpm
c. 16.75 m
a. 3.25 hp
