# Power Systems Questions and Answers – Skin Effect and Proximity Effect – 1

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This set of Power Systems Multiple Choice Questions & Answers (MCQs) focuses on “Skin Effect and Proximity Effect – 1”.

1. Ripple of the DC-output at power converter is ____________
a) maximum value of instantaneous difference between average and instantaneous value
b) minimum value of instantaneous difference between average and instantaneous value
c) average value of output
d) maximum value of instantaneous value

Explanation: Ripple at a power converter is maximum value of instantaneous difference between average and instantaneous value.

2. Smooth reactor is connected between _____________
a) DC output of converter and load
c) source and input of converter
d) any of the mentioned

Explanation: Smoothening reactor is connected between the dc output and load to provide sinusoidal source current.

3. Which of the above is not a DC link?
d) None of the mentioned

Explanation: All are types of DC link.
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4. (i) Monopolar DC link has one energised conductor of positive polarity.
(ii) It was ground as return path
Opt the most appropriate.
a) (i) is False & (ii) is True
b) (i) is True & (ii) is True
c) Both are false
d) (i) is True & (ii) is False

Explanation: Negative polarity is preferred on OH lines due to less radio interference.

5. (i) Bipolar link has two conductors
(ii) Both conductors have same magnitude of voltage.
a) (i) is False & (ii) is True
b) (i) is True & (ii) is True
c) Both are false
d) (i) is True & (ii) is False

Explanation: Both the statements are correct.

6. If the currents in the two conductors of bipolar HDVC link is same, then _______
a) ground current is zero
b) two poles work independently
c) ground current zero and two poles work independently
d) none of the mentioned

Explanation: When the two conductors in bipolar link are same then ground current is zero and they have no interaction.

a) reduce corona loss
c) improve reliability
d) all of the mentioned

Explanation: Homopolar link reduces corona loss.

8. Which of the DC links can be operated when a fault occurs in the transmission line?

Explanation: 50% of rated power can be supplied.

9. The overvoltage that occur mainly under converter stations are due to _________
(i) Lightening and switching overvoltage
(ii) Transients produced in conductors
(iii) Overvoltage due to fault clearing
Choose the correct option.
a) (i), (ii), (iii)
b) (ii), (iii)
c) (iii)
d) (i), (ii)

Explanation: All the statements are correct.

10. Insulator capacitance is does not play significant role in HVDC lines
a) True
b) False

Explanation: There is no capacitive current which flows in HVDC link.

Sanfoundry Global Education & Learning Series – Power Systems.

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