Electrical Engineering MCQs on Power Transmission
If length of a cable is doubled, its capacitance
- Becomes doubled
- Becomes one-fourth
- Becomes one-half
- Remains unchanged
Correct answer: 1. Becomes doubled
Explanation:
The length of cable and the capacitance of the cable are directly proportional to each other. If the length of cable gets doubled, the capacitance will also be doubled.
The basic formula relationship between capacitance and length is given as:
- R is outer radius of cable
- r is inner radius of cable
- l is length
From equation one can easily understand that capacitance and length are directly proportional to each other. Hence if the length of cable is doubled the capacitance will also become doubled.