Of the following, which does not belong to a nuclear reactor ?

Of the following, which does not belong to a nuclear reactor ?

A turbine
A heat exchanger
A mechanism to reduce CO2 emission
A reaction chamber
This question was previously asked in
UPSC NDA-1 – 2024
A mechanism to reduce CO2 emission does not belong to a nuclear reactor itself.
Nuclear reactors are power plants that generate electricity through nuclear fission, a process that does not produce carbon dioxide. Therefore, a mechanism *within the reactor* specifically designed to reduce CO2 emissions is not a component of a nuclear reactor. Other listed items (turbine, heat exchanger, reaction chamber/core) are integral parts of the nuclear power generation process.
Nuclear power is often promoted as a low-carbon energy source because it avoids the CO2 emissions associated with burning fossil fuels. However, this is a characteristic of the energy source itself (absence of CO2 production during fission) rather than a component within the reactor designed for CO2 reduction.