Question

Boiling water reactor and pressurized water reactors are
A. Nuclear reactor
B. Solar reactor
C. OTEC
D. Biogas reactor

Answer 1

A nuclear reactor, also known as an atomic pile, is a device that is used to start and regulate nuclear chain reactions or nuclear fusion events. Nuclear reactors are used to generate energy in nuclear power stations and for nuclear marine propulsion. Nuclear fission heat is transferred to a working fluid (water or gas), which then drives steam turbines. These either crank the shafts of electricity generators or drive the propellers of a ship. In principle, nuclear-generated steam may be utilised for industrial process heat or district heating.

Complete step by step answer:
BWR: A boiling water reactor (BWR) is a light water nuclear reactor that is used to generate electricity. After the pressurised water reactor (PWR), which is also a kind of light water nuclear reactor, it is the second most prevalent type of electricity-generating nuclear reactor.

The major distinction between a BWR and a PWR is that a BWR's reactor core warms water, which subsequently transforms into steam and operates a steam turbine. The reactor core of a PWR warms water that does not boil. The heated water then exchanges heat with a lower-pressure water system, converting to steam and powering the turbine.

PWR: A light-water nuclear reactor is a pressurised water reactor (PWR). The vast majority of nuclear power facilities in the world are PWRs (with notable exceptions being the UK, Japan and Canada). The primary coolant (water) of a PWR is pumped under high pressure to the reactor core, where it is heated by the fission of atoms.

The heated, high-pressure water then travels to a steam generator, where it converts its thermal energy to lower-pressure water used in a secondary system to create steam. After that, the steam powers turbines, which turn an electric generator. Unlike a boiling water reactor (BWR), pressure in the primary coolant loop keeps the water from boiling.

Hence option A is correct.

Note: Nuclear fission can occur when a big fissile atomic nucleus, such as uranium-235 or plutonium-239, receives a neutron. The heavy nucleus (the fission products) breaks into two or more lighter nuclei, releasing kinetic energy, gamma radiation, and free neutrons. Other fissile atoms may absorb some of these neutrons, triggering additional fission events, which release more neutrons, and so on. A nuclear chain reaction is what this is called.