Power Plant Engineering - Study Mode

[#51] The predominant isotope of the naturally occurring element is
Correct Answer

(B) U 238

Explanation

Solution: Uranium (92U) is a naturally occurring radioactive element that has no stable isotopes but two primordial isotopes (uranium-238 and uranium-235).

[#52] A nuclear fission produces energy of following order in MeV
Correct Answer

(B) 200

Explanation

Solution: A nuclear fission produces energy of 200 MeV

[#53] A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is
Correct Answer

(B) More

Explanation

Solution: A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is More

[#54] A fast breeder reactor
Correct Answer

(C) Has no moderator

Explanation

Solution: fast breeder reactor means that sufficient fissions can be initiated by the capture of high energy (fast) neutrons. Moderators are used to slow down the neutrons without absorbing them. In a fast breeder reactor no moderator is required

[#55] Which of the following is the primary fuel?
Correct Answer

(B) U

Explanation

Solution: Uranium-235 is the fuel that is used in a nuclear reactor to sustain a nuclear chain reaction. These fuels are fissile and the most common nuclear fuels are the radioactive metals uranium-235 and plutonium-239.