Questions and Answers
What is the equivalent of 100 kW in joules per second?
100,000
What is the open-circuit voltage of a fully charged lead-acid cell?
2.2 volts
What is the KV rating of a surge arrester needed for an 11kV ungrounded system?
12kV
What type of transformer connection is used for three to two phase conversion?
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What does a conservator tank in a power transformer intend to minimize?
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Why is a bird not electrocuted when landing on hot transmission lines?
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What is the unit of magnetic field intensity in the CGS system?
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What is the material used for transistors?
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What is the least efficient power plant?
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What is the unconventional unit of mmf in the CGS system?
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What is the reason for the presence of ozone as a result of corona being harmful?
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What does an overcurrent relay do?
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What instrument visually shows magnitude and shape of an alternating current signal?
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What is the reason for transformers being rated in KVA instead of KW?
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What does a space station with communication equipment that synchronizes with the earth's orbit indicate?
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What is the equivalent of 100 kW in joules per second?
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What is the open-circuit voltage of a fully charged lead-acid cell?
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What type of transformer connections are used for three to two phase conversion?
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What is the most probable per unit transient reactance for an alternator rated 100 MW?
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What should be the KV rating of a surge arrester to be used for an 11 kV ungrounded system?
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Which of the following is not a standard distribution voltage?
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What is the unit of magnetic field intensity in the CGS system?
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What does an overcurrent relay do?
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What is the least efficient power plant?
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What is the unconventional unit of mmf in the CGS system?
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What is the reason for transformers being rated in KVA instead of KW?
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What instrument visually shows magnitude and shape of an alternating current signal?
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Which of the following is not a standard distribution voltage?
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What does a space station with communication equipment that synchronizes with the earth's orbit indicate?
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$1$ watt is equal to how many ergs per second?
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Which material is used for transistors?
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Study Notes
Electrical Engineering
- 100 kW is equivalent to 100,000 joules per second.
- A fully charged lead-acid cell has an open-circuit voltage of 2.1 volts.
- For an 11 kV ungrounded system, a surge arrester with a KV rating of 15 kV is required.
- Open-delta and T-delta connections are used for three to two phase conversions.
- A conservator tank in a power transformer is used to minimize oil leakage.
Electrical Safety
- A bird is not electrocuted when landing on hot transmission lines because it is not grounded.
- The unit of magnetic field intensity in the CGS system is the oersted.
- Silicon is the material used for transistors.
- The least efficient power plant is a nuclear power plant.
- The unconventional unit of mmf (magnetomotive force) in the CGS system is the gilbert.
Electrical Measurement
- An overcurrent relay detects excessive current in an electrical circuit and initiates a disconnect or alarm.
- An oscilloscope visually shows the magnitude and shape of an alternating current signal.
Electrical Systems
- Transformers are rated in KVA instead of KW because they are designed to handle reactive power in addition to active power.
- A space station with communication equipment that synchronizes with the earth's orbit indicates it is a geosynchronous satellite.
- The most probable per unit transient reactance for an alternator rated 100 MW is 0.2-0.3 pu.
Miscellaneous
- 1 watt is equal to 10^7 ergs per second.
- 230V is not a standard distribution voltage.
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