Resistance to abrasion.
Resistance to slag peneration.
Stability of volume at high temperature.
Resistance to corrosion by slag.
✅ The correct answer is option A.
Engineering
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3412. Radioactive decay is a __________ change.
chemical
nuclear
physical
none of these
✅ The correct answer is option B.
3413. Coolant present in the primary circuit of a pressurised water reactor is high pressure
sub cooled water
saturated water
superheated steam
saturated steam
✅ The correct answer is option B.
3414. With increasing alumina content, the fusion point of high alumina refractories
increases.
decreases.
remains constant.
may increase or decrease ; depends on its alumina content.
✅ The correct answer is option A.
3415. Basic bricks are not made of
fireclay
magnesite
foresterite
chromite
✅ The correct answer is option A.
3416. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.
1100
2200
3300
4400
✅ The correct answer is option B.
3417. The size of an atom is of the order of one
°Angstrom
fermi
micron
mm
✅ The correct answer is option A.
3418. A fertile material is the one, which can be
converted into fissile material on absorption of neutron.
fissioned by slow (thermal) neutrons.
fissioned by fast neutrons.
fissioned by either slow or fast neutrons.
✅ The correct answer is option A.
3419. Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of __________ °C.
1380
1520
1710
1915
✅ The correct answer is option C.
3420. Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
oxidising
neutral
either (a) or (b)
neither (a) nor (b)
✅ The correct answer is option C.