Due to which of the following reasons the cables should not be operated too hot ?
Correct answer: E. All of the above
- A. The oil may loose its viscosity and it may start drawing off from higher levels
- B. Expansion of the oil may cause the sheath to burst
- C. Unequal expansion may create voids in the insulation which will lead to ionization
- D. The thermal instability may rise due to the rapid increase of dielectric losses with temperature
- E. All of the above
Explanation
Excessive cable temperature can reduce oil viscosity, expand the oil, create insulation voids through unequal expansion, and increase dielectric losses through thermal instability. Each listed effect is therefore a reason for limiting cable temperature.
Last updated
Practise Wiring, Installation and Safety
115 free Wiring, Installation and Safety MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
A fuse in a motor circuit provides protection against__________?
A fuse is connected_______________?
A fuse is never inserted in____________?
A relay is ___________switch?