Questions and answers for exam Preparation

MCQs

Total Questions : 164 | Page 14 of 17 pages

Question 131. The relative permittivity of rubber is____________?

between 2 and 3
between 5 and 6
between 8 and 10
between 12 and 14

Discuss Question

Answer: Option A. -> between 2 and 3
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 132. PVC stands for____________?

polyvinyl chloride
post varnish conductor
pressed and varnished cloth
positive voltage conductor
none of the above

Discuss Question

Answer: Option A. -> polyvinyl chloride
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 133. Pressure cables are generally not used beyond__________?

11 kV
33 kV
66 kV
132 kV

Discuss Question

Answer: Option C. -> 66 kV
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 134. 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_____________?

one half
double
four times
none of the above

Discuss Question

Answer: Option A. -> one half
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 135. Solid type cables are considered unreliable beyond 66 kV because___________?

insulation may melt due to higher temperature
skin effect dominates on the conductor
of corona loss between conductor and sheath material
there is a danger of breakdown of insulation due to the presence of voids

Discuss Question

Answer: Option D. -> there is a danger of breakdown of insulation due to the presence of voids
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 136. In cables the charging current__________?

lags the voltage by 90°
leads the voltage by 90°
lags the voltage by 180°
leads the voltage by 180°

Discuss Question

Answer: Option B. -> leads the voltage by 90°
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 137. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?