Solar Power System Design for Satellites Quiz

1

What is the primary reason for using triple-junction solar cells in modern satellites instead of silicon cells?

A) Lower manufacturing cost

B) Higher radiation resistance

C) Higher efficiency and better performance in space environment

D) Lighter weight

2

What is the main purpose of a shunt regulator in a satellite power system?

A) To boost the voltage from solar arrays

B) To dissipate excess power when batteries are fully charged

C) To convert DC to AC for payload operations

D) To regulate the temperature of solar panels

3

Which factor is most critical when calculating the required solar array area for a satellite in GEO orbit?

A) Solar cell efficiency at Beginning of Life (BOL)

B) The eclipse duration and depth of discharge

C) Solar cell efficiency at End of Life (EOL) after radiation degradation

D) The satellite's altitude above Earth

4

What is the primary purpose of using cover glasses on solar cells in space applications?

A) To enhance light absorption through anti-reflective coating

B) To provide radiation shielding and protect against micrometeoroids

C) To reduce thermal cycling effects on the cells

D) To prevent outgassing of cell materials

5

In a satellite power system, what is the main function of the Battery Charge Regulator (BCR)?

A) To prevent overcharging and control charging current to batteries

B) To convert battery voltage to bus voltage

C) To distribute power to different subsystems

D) To monitor solar array output power

6

What is the "solar constant" value used in satellite power calculations?

A) 1361 W/m²

B) 1000 W/m²

C) 1500 W/m²

D) 1250 W/m²

7

Which battery technology is most commonly used in modern satellites due to its high energy density and cycle life?

A) Nickel-Cadmium (NiCd)

B) Nickel-Hydrogen (NiH₂)

C) Lithium-ion (Li-ion)

D) Lead-Acid

8

What does the term "depth of discharge" (DOD) refer to in satellite battery design?

A) The percentage of battery capacity used during eclipse

B) The physical depth of battery cells in the enclosure

C) The discharge rate during peak power demand

D) The temperature drop during battery discharge

9

Why are solar arrays sometimes designed with articulated (movable) panels rather than body-mounted panels?

A) To reduce launch vehicle volume constraints

B) To maintain optimal sun pointing throughout the orbit

C) To minimize radiation exposure

D) To simplify thermal control

10

What is the primary cause of solar cell degradation in the space environment?

A) Ultraviolet radiation

B) Thermal cycling between sunlight and eclipse

C) High-energy particle radiation

D) Atomic oxygen erosion

11

In a typical satellite power budget, what margin is typically added to the calculated power requirements?

A) 5-10%

B) 10-20%

C) 20-30%

D) 30-50%

12

What is the primary advantage of a Maximum Power Point Tracking (MPPT) system in satellite solar arrays?

A) It reduces the weight of the power system

B) It extracts the maximum available power as operating conditions change

C) It eliminates the need for battery charging regulators

D) It simplifies the thermal control system

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