Chapter 27 Questions Flashcards
To achieve the same EIRP you can have high power with ________ TX antenna gain or low power with _____ antenna gain.
a. fixed, variable
b. dynamic, static
c. low, high
d. high,low
c. low, high
Doubling the distance between TX and RX would increase the space losses by ____ times.
a. 2
b. 8
c. 4
d. Space loss is independent of distance
c. 4
The comm link for a new science mission requires an Eb/No of 5 dB to achieve the required BER. If the EIRP is 1 dBW, Ls is -145 dB, La is -1 dB, Gr is 10 dB, the data rate is 60 dB, and the system noise temperature is 26 dB. What is the link margin?
a. 2.6 dB
b. 5 dB
c. 0 dB
d. 3 dB
a. 2.6 dB
Match the following steps in the Cost Estimating Process with the appropriate tasks.
Define the level and scope of the cost estimate.
a. Evaluation
b. Input.
c. Execution
b. Input
Match the following steps in the Cost Estimating Process with the appropriate tasks.
Apply cost adjustments.
a. Evaluation
b. Input.
c. Execution
c. Execution
Match the following steps in the Cost Estimating Process with the appropriate tasks.
Collect baseline mission information from design engineers; establish estimation ground rules.
a. Evaluation
b. Input.
c. Execution
b. Input
Match the following steps in the Cost Estimating Process with the appropriate tasks.
Determine major cost drivers for potential reductions
a. Evaluation
b. Input.
c. Execution
a. Evaluation
Match the following steps in the Cost Estimating Process with the appropriate tasks.
Assess the mission’s cost risk and calculate project or program reserves.
a. Evaluation
b. Input.
c. Execution
c. Execution
Match the following steps in the Cost Estimating Process with the appropriate tasks.
Test sensitivity of lifecycle costs to key assumptions and requirements.
a. Evaluation
b. Input.
c. Execution
a. Evaluation
Match the following Cost Estimating Methods discussed in this lesson with the statements that best fit.
Primary method used during Pre-Phase A and Phase A; when we know or can estimate only a few key variables.
a. Analogy
b. Parametric Cost Model
c. Grassroots
b. Parametric Cost Model
Match the following Cost Estimating Methods discussed in this lesson with the statements that best fit.
Also known as a “bottoms-up” estimate; requires a detailed design and understanding of the elements that constitute the system.
a. Analogy
b. Parametric Cost Model
c. Grassroots
c. Grassroots
Match the following Cost Estimating Methods discussed in this lesson with the statements that best fit.
Typically time-consuming; can’t typically prepare many of them during trade studies of advanced system concepts; primary method for Phases C and D.
a. Analogy
b. Parametric Cost Model
c. Grassroots
c. Grassroots
Match the following Cost Estimating Methods discussed in this lesson with the statements that best fit.
Most common example is a statistical Cost Estimating Relationship (CER) which uses a single equation or set of equations to relate one or more system characteristics to cost.
a. Analogy
b. Parametric Cost Model
c. Grassroots
b. Parametric Cost Model
Match the following Cost Estimating Methods discussed in this lesson with the statements that best fit.
A way to estimate cost based on a component having functional and performance characteristics similar to one whose cost is known.
a. Analogy
b. Parametric Cost Model
c. Grassroots
a. Analogy
Match the following Cost Estimating Methods discussed in this lesson with the statements that best fit.
Can be applied to any level of detail in a system; often proves to be unworkable and inflexible for trade studies.
a. Analogy
b. Parametric Cost Model
c. Grassroots
a. Analogy
