Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Screened cables can be used for voltages:a)up... Start Learning for Free
Screened cables can be used for voltages:
- a)up to 11 kV
- b)11 kV to 33 kV
- c)33 kV to 66 kV
- d)66 kV to 132 kV
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Screened cables can be used for voltages:a)up to 11 kVb)11 kV to 33 kV...
- In practice, underground cables are generally required to deliver 3-phase power. For the purpose, either three-core cable or three single-core cables may be used.
- For voltages upto 66 kV, 3-core cable (i.e., multi-core construction) is preferred due to economic reasons.
- However, for voltages beyond 66 kV, 3-core-cables become too large and unwieldy and, therefore, single-core cables are used.
The following types of cables are generally used for 3-phase service:
- Belted cables — up to 11 kV
- Screened cables — from 22 kV to 66 kV
- Pressure cables — beyond 66 kV.
Screened cables: These cables are meant for use up to 33 kV, but in particular cases, their use may be extended to operating voltages up to 66 kV. Two principal types of screened cables are H type cables and S.L. type cables.
Most Upvoted Answer
Screened cables can be used for voltages:a)up to 11 kVb)11 kV to 33 kV...
Screened cables are used in high voltage applications to provide insulation and protection against electrical interference. These cables consist of a conductor, insulation layer, and a metallic screen.
Screened cables are designed to withstand high voltages and provide a safe and reliable means of transmitting electrical power. The voltage range for which screened cables are suitable depends on their construction and design. In this case, the correct answer is option 'C', which states that screened cables can be used for voltages ranging from 33 kV to 66 kV. Let's explain why this is the correct answer.
- Screened Cables Overview:
- Screened cables are designed with an additional metallic layer, often made of copper or aluminum, surrounding the insulation layer.
- The metallic screen provides a shielding effect, reducing the impact of external electromagnetic fields on the cable and minimizing the emission of electromagnetic interference.
- The metallic screen also serves as an additional layer of protection, preventing electrical faults from spreading to the surroundings.
- Voltage Ranges:
- Option 'A' states that screened cables can be used for voltages up to 11 kV. While screened cables can indeed be used for lower voltage applications, they are typically employed in high voltage systems where the risk of electrical interference is greater.
- Option 'B' suggests that screened cables are suitable for voltages ranging from 11 kV to 33 kV. While this is a common voltage range for medium voltage applications, it does not encompass the full range of voltages that screened cables are capable of handling.
- Option 'C' correctly states that screened cables can be used for voltages ranging from 33 kV to 66 kV. This range covers a significant portion of high voltage applications, such as power transmission and distribution systems.
- Option 'D' suggests that screened cables are suitable for voltages ranging from 66 kV to 132 kV. While screened cables can indeed be used for these voltage levels, this option represents a narrower range compared to option 'C'.
Therefore, option 'C' is the correct answer as it accurately describes the voltage range for which screened cables are typically used, which is from 33 kV to 66 kV.
Screened cables are designed to withstand high voltages and provide a safe and reliable means of transmitting electrical power. The voltage range for which screened cables are suitable depends on their construction and design. In this case, the correct answer is option 'C', which states that screened cables can be used for voltages ranging from 33 kV to 66 kV. Let's explain why this is the correct answer.
- Screened Cables Overview:
- Screened cables are designed with an additional metallic layer, often made of copper or aluminum, surrounding the insulation layer.
- The metallic screen provides a shielding effect, reducing the impact of external electromagnetic fields on the cable and minimizing the emission of electromagnetic interference.
- The metallic screen also serves as an additional layer of protection, preventing electrical faults from spreading to the surroundings.
- Voltage Ranges:
- Option 'A' states that screened cables can be used for voltages up to 11 kV. While screened cables can indeed be used for lower voltage applications, they are typically employed in high voltage systems where the risk of electrical interference is greater.
- Option 'B' suggests that screened cables are suitable for voltages ranging from 11 kV to 33 kV. While this is a common voltage range for medium voltage applications, it does not encompass the full range of voltages that screened cables are capable of handling.
- Option 'C' correctly states that screened cables can be used for voltages ranging from 33 kV to 66 kV. This range covers a significant portion of high voltage applications, such as power transmission and distribution systems.
- Option 'D' suggests that screened cables are suitable for voltages ranging from 66 kV to 132 kV. While screened cables can indeed be used for these voltage levels, this option represents a narrower range compared to option 'C'.
Therefore, option 'C' is the correct answer as it accurately describes the voltage range for which screened cables are typically used, which is from 33 kV to 66 kV.
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