Answer: the half-angle "alpha" of the Mach cone = 30⁰
Explanation:
To calculate the half-angle "alpha" of the Mach cone.
we say ;
Sin∝ = 1 / Ma
given that Ma = 2
now we substitute
Sin∝ = 1 / 2
Sin∝ = 0.5
∝ = Sin⁻¹ 0.5
∝ = 30⁰
Therefore, the half-angle "alpha" of the Mach cone is 30⁰
Answer:
gain = 353.3616
P_r = 1.742*10^-8 W
Explanation:
Given:
- The output Power P_o = 0.1 W
- The diameter of the antennas d = 1.2 m
- The frequency of signal f = 2 GHz
Find:
a. What is the gain of each antenna?
b. If the receiving antenna is located 24 km from the transmitting antenna over a free space path, find the available signal power out of the receiving antenna.
Solution:
- The gain of the parabolic antenna is given by the following formula:
gain = 0.56 * 4 * pi^2 * r^2 / λ^2
Where, λ : The wavelength of signal
r: Radius of antenna = d / 2 = 1.2 / 2 = 0.6 m
- The wavelength can be determined by:
λ = c / f
λ = (3*10^8) / (2*10^9)
λ = 0.15 m
- Plug in the values in the gain formula:
gain = 0.56 * 4 * pi^2 * 0.6^2 / 0.15^2
gain = 353.3616
- The available signal power out from the receiving antenna is:
P_r = (gain^2 * λ^2 * W) / (16*pi^2 * 10^2 * 10^6)
P_r = (353.36^2 * 0.15^2 * 0.1) / (16*pi^2 * 10^2 * 10^6)
P_r = 1.742*10^-8 W
Answer:
b. A view of a building seen from one side, a flat representation of one façade. This is the most common view used to describe the external appearance of a building.
Explanation:
An elevation is a three-dimensional, orthographic, architectural projection that reveals just a side of the building. It is represented with diagrams and shadows are used to create the effect of a three-dimensional image.
It reveals the position of the building from ground-depth and only the outer parts of the structure are illustrated. Elevations, building plans, and section drawings are always drawn together by the architects.
Answer: See explanation
Explanation:
1. How is diesel fuel ignited in a warm diesel engine?
B. Heat compression
2. Which type of diesel injection produces less noise?
A. Indirect injection (IDI)
3. Which diesel injection system requires the use of a glow plug?
A. Indirect injection (IDI)
4. The three phases of diesel ignition include:
C. Ignition delay, repaid combustion, controlled combustion.
5. What fuel system component is used in a vehicle equipped with a diesel engine that is seldom used on the same vehicle when it is equipped with a gasoline engine?
D. Water-fuel separator
6. The diesel injection pump is usually driven by a _________________.
A. Gear off the camshaft
7. Which diesel system supplies high-pressure diesel fuel to all the injectors all of the time?
C. High-pressure common rail
8. Glow plugs should have high resistance when _____________and lower resistance when __________________.
B. Warm/cold
9. Technician A says that glow plugs are used to help start a diesel engine and are shut off as soon as the engine starts. Technician B says that the glow plugs are turned off as soon as a flame is detected in the combustion chamber. Which Technician is correct?
D. Neither Technicians A NOR B
10. What part should be removed to test cylinder compression on a diesel engine?
D. A glow plug
