# Skin Effect Causes - MCQs with Answers

## Skin Effect Causes - MCQs with Answers

Q1. On what factors does the skin effect depend upon?

a. Cross section of the conductors.
b. Supply frequency.
c. Permeability of the conductor.
d. All of these.

Q2. What are the line constants in a transmission line?

a. Resistance and series conductance only.
b. Series and shunt conductance.
c. Resistance, inductance and capacitance.
d. Resistance, inductance, capacitance and shunt conductance.

ANSWER: d. Resistance, inductance, capacitance and shunt conductance.

Q3. What is the cause of skin effect?

a. Supply frequency.
b. Self inductance of conductor.
c. High sensitive material in the centre.
d. Both (a) and (b)

ANSWER: d. Both (a) and (b)

Q4. The conductor carries more current on the surface in comparison to its core. What is this phenomenon called?

a. Corona
b. Ferranti effect.
c. Skin effect.
d. Proximity effect.

Q5. By using which conductor is the skin effect reduced?

a. Bundled conductors.
b. Stranded conductors.
c. Hollow conductors.
d. Solid conductors.

Q6. In which of the transmission systems is the skin effect observed?

a. Cable carrying dc current.
b. DC transmission line only.
c. AC transmission line only.
d. DC as well as AC transmission lines.

ANSWER: c. AC transmission line only.

Q7. Skin effect in a conductor is proportional to

a. (Diameter of conductor)1/2
b. Diameter of conductor.
c. (Diameter of conductor)2
d. (Diameter of conductor)4

Q8. Skin effect is negligible for what supply frequency and for what diameter?

a. < 50 Hz and < 1 cm.
b. < 50 Hz and > 1 cm.
c. > 50 Hz and < 1 cm.
d. > 50 Hz and > 1 cm.