Aux 2 Unit 6 Electricity misc Flashcards

What is the power factor (cosθ) in relation to true power and apparent power?

B) The ratio of kW to kVA

What does the term "150 Ah" indicate in relation to a storage battery?

D) The battery’s capacity to supply 1 ampere for 150 hours

What is the relationship between true power (kW), apparent power (kVA), and reactive power (kVAr) in an AC electrical system?

B) kVA² = kW² + kVAr²

What does the term UPS stand for in the context of electrical systems?

B) Uninterrupted Power Supply

What determines how reactive power (kVAr) is shared between two parallel generators?

B) The generator with the higher voltage output takes most of the reactive load

What does the Ah rating of a battery help determine?

C) The total charge capacity the battery can deliver over time

What would happen if one generator has a higher excitation than the other in a parallel setup?

B) It would take on more reactive power than the other generator

How is stable load sharing of kW and kVAr between generators connected in parallel achieved?

B) Through precise adjustment of governors and excitation systems

What is the main function of an inverter in an electrical system?

B) To convert DC power to AC power

Why might an inverter be required in a UPS system?

B) To convert stored DC power from the batteries into AC power for connected equipment

What is the primary function of a UPS in an electrical system?

B) To provide temporary power during a power outage

Which type of power does not contribute to actual work being performed in an AC electrical system?

C) Reactive power (kVAr)

If a battery is rated at 150 Ah, how long can it theoretically provide a current of 30 amperes?

B) 5 hours

How is true power (kW) shared between two generators connected in parallel?

B) Proportionally based on their load sharing set points and prime mover control

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