EE MCQ

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MGVCL Exam Paper (30-07-2021 Shift 1)
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A THHN conductor will have 75°C termination on one end and a 60/75°C termination on the other, which ampacity column will be used?

Conductor with 75 °C temperature rating must have ampacity from the 60°C column or the 75°C column.

It is permissible to use the 75°C rating if the installed conductor is rated at least 75 °C.

Because all of the connection points in this example have at least a 75°C rating, the conductor’s ampacity can be based on the 75°C column

MGVCL Exam Paper (30-07-2021 Shift 1)
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For sea water with σ = 5 mho/m and ε_r = 80, what is the distance for which ratio signal can be transmitted with 90% attenuation at 25 kHz?

Condition of good conductor:

σ/ϵω >> 1

Equation is given by:

The constant ratio = σ/ϵω

= 44913.6

σ/ϵω >> 1.

hence sea water is a acting as a good conductor Since attenuation is 90%, so transmission is 10%

So,

e^(-αx) = 0.1

Attenuation constant = √(σμϵ/2)

= 0.702

-αx = ln(0.1)

x = 3.27 m