Question 1

Solar panels only use diodes to generate electricity from sunlight.

Accepted Answer

While solar cells themselves are large p-n junction diodes that generate power via the photovoltaic effect, bypass diodes are separate, protective semiconductor components used purely to route current around shaded or damaged cells.

Question 2

The 'Make in India' solar modules were already 100 percent manufactured in India before this 2025 development.

Accepted Answer

While the physical assembly of solar modules and the manufacturing of base solar cells happen in India, critical discrete electronic components like bypass diodes were still heavily imported.

Question 3

Consider the following statements regarding Solar Bypass Diodes and India's semiconductor ecosystem:
1. Solar bypass diodes are primarily utilized to increase the theoretical maximum voltage output of a photovoltaic module in ideal sunlight.
2. Under normal uniform sunlight conditions, a bypass diode in a solar module operates in reverse bias and does not conduct current.
3. The indigenous production of high-power discrete devices like bypass diodes by CDIL was supported by the framework of the India Semiconductor Mission (ISM).
How many of the above statements are correct?

Accepted Answer

(b) Only two — Statement 1 is incorrect: Bypass diodes do not increase theoretical maximum voltage; they are protective devices that prevent massive power loss and damage when a portion of the panel is shaded. Statement 2 is correct: In normal conditions, the bypass diode is reverse-biased, allowing the generated current to flow to the external load. Statement 3 is correct: CDIL's expansion for producing these diodes was part of the projects approved under the ISM.

Question 4

Match List I (Component/Initiative) with List II (Function/Objective):
List I:
A. Photovoltaic Cell
B. Bypass Diode
C. PM Surya Ghar Muft Bijli Yojana
D. India Semiconductor Mission

List II:
1. Prevents localized heating by redirecting current around shaded areas
2. Generates electromotive force when illuminated by light
3. Aims to build a sustainable domestic display and electronic components ecosystem
4. Scheme aiming to provide free electricity to households via rooftop solar

Select the correct answer using the code given below:

Accepted Answer

(a) A-2, B-1, C-4, D-3 — A photovoltaic cell (A) operates via the photovoltaic effect to generate EMF when illuminated (2). A bypass diode (B) protects shaded cells by forward-biasing to redirect current, preventing hot spots (1). The PM Surya Ghar Yojana (C) promotes rooftop solar for households (4). The India Semiconductor Mission (D) focuses on building a domestic semiconductor ecosystem (3).

Question 5

Assertion (A): The integration of bypass diodes in a solar module prevents the occurrence of 'hot spots' when part of the panel is covered by shadows or dust.
Reason (R): A shaded solar cell acts as a load and becomes reverse-biased, but the bypass diode connected in parallel becomes forward-biased, providing an alternate path for the current.
Select the correct answer from the codes given below:

Accepted Answer

(a) Both A and R are true and R is the correct explanation of A. — When a solar cell is shaded, it stops generating current and instead resists the current generated by the other unshaded cells in series. This reverse-biases the shaded cell, causing it to dissipate power as heat (a hot spot). The bypass diode, wired in parallel with reverse polarity to the cell, becomes forward-biased under these conditions, safely routing the string's current around the shaded cell. Thus, R perfectly explains the mechanism behind A.

India's First Indigenous Solar Bypass Diodes

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