What is the main advantage of the nutrient film technique for hydroponically growing plants?
What will be an ideal response?
Main advantage: plant roots are exposed to adequate supplies of water, oxygen, and
nutrients.
Other advantages:
• Low capital cost plus simplicity of installation and operation
• Precise control of nutrition
• Eliminates the need for soil sterilization and preparation
• Quick turnaround between crops
• Reduction in transplanting shock by use of growing cubes and preheating the
nutrient solution to provide optimal root temperatures
• It is easy to adjust the nutrient solution formulation and use systemic insecticides
and fungicides in the nutrient solution
• Potential energy savings by keeping the greenhouse temperature lower than normal
levels due to maintenance of optimal root temperatures
• Eliminates water stress in plants between irrigation cycles by continuous watering
• Conservation of water by using a cyclic system
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Technician A says an OBD II trip is the same as a drive cycle. Technician B says a trip is a period of operation that allows a monitor to complete. Who is correct?
A. Technician A B. Technician B C. Both A and B D. Neither A or B
A simple insulated concentric tube heat exchanger is used to cool hot oil by transferring heat to water. Hot oil enters the center tube at 120°C, and a mass flow rate of 5.0 kg/s. The oil exits the heat exchanger at 80°C. Liquid water flows through the annulus surrounding the central tube. The water enters at 10°C.
(a) If the water exits at 50°C, determine the mass flow rate of the water. (b) Using your heat exchanger model to acquire the data, plot the required mass flow rate of the water for water exit temperatures ranging from 15°C to 75°C. Consider the specific heat of the oil to be 1.90 kJ/kg-K, and the specific heat of the liquid water to be 4.18 kJ/kg-K. Consider State 1 to be the oil inlet and State 2 to be the oil outlet. Consider State 3 to be the water inlet and State 4 to be the water outlet. Given: T1 = 120°C; m?oil = 5.0 kg/s; T2 = 80°C T3 = 10°C, T4 = 50°C Assume: Q?=0 (insulated). Also, given no other information regarding the heat exchanger, make the following common heat exchanger assumptions: W?=?KE=?PE=0 Also, assume the heat exchanger is a multiple-inlet, multiple-outlet, steady-state, steady-flow device. What will be an ideal response?
Excessive positive camber will cause tire wear ________
A) On both tire edges B) On the outside shoulder of the tire C) In the middle of the tire D) On the inside shoulder of the tire
What are the benefits of a strategic plan?
What will be an ideal response?