3721. The specific heats of three gaseous coolants namely H2, He and CO2 in the increasing order are
CO2, He, H2
CO2, H2, He
H2, He, CO2
H2, CO2, He
✅ The correct answer is option A.
Chemical Engineering
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3722. Plutonium
is recovered from spent fuel from thermal nuclear reactor.
has much lower melting point (640°C ) compared to thorium (1690°C).
both (a) and (b).
neither (a) nor (b).
✅ The correct answer is option C.
3723. Coolant used in a boiling water reactor is
hydrogen gas
water
steam
a mixture of water & steam
✅ The correct answer is option D.
3724. Ceramic nuclear metals compared to solid nuclear metals have
higher melting points.
low strength at high temperature.
more chances of radiation damage.
poorer corrosion resistance.
✅ The correct answer is option A.
3725. Which of the following is the best nuclear fuel?
Np- 239
U-234
Pu-239
Th-236
✅ The correct answer is option C.
3726. A thermal nuclear reactor compared to a fast breeder reactor
uses slower neutrons for fission.
uses faster neutrons for fission.
gives higher power density.
requires less fuel to run at the same power level.
✅ The correct answer is option A.
3727. The first underground nuclear test was conducted by India at
Jaisalmer
Pokharan
Kalpakkam
Narora
✅ The correct answer is option B.
3728. Which of the following is not a good moderating material ?
Concrete
Boron
18/8 stainless steel
All (a), (b) and (c)
✅ The correct answer is option D.
3729. Heat is generated in a nuclear reactor (thermal) by
combustion of a nuclear fuel e.g. uranium.
fusion of atoms of uranium.
absorption of neutrons in uranium atoms.
fission of U-235 by neutrons.
✅ The correct answer is option D.
3730. Molten sodium (as a coolant in fast breeder reactor)
can’t attain high temperature at normal pressure.
is not at all corrosive, even at a higher temperature.
is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water.
none of these
✅ The correct answer is option C.