22951. The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235 , followed by nuclear fission is
22952. A fertile material is the one, which can be
22953. Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).
22954. Thorium metal
22955. Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.
22956. Atoms with same number of neutrons, but different number of nucleons are called
22957. Which of the following ores contains maximum percentage of uranium ?
22958. Uranium ore is currently mined & concentrated at
22959. How many atoms are present in one gm-atom of an element ?
22960. Emission of β-particles during radioactive decay of a substance is from
22961. Percentage of U-238 in natural uranium is around
22962. A H.P.M.V. lamp gives
22963. A fast breeder reactor employs
22964. Which of the following may be used to measure the rate of nuclear disintegration?
22965. The decrease in the atomic number is not observed in case of
22966. The mass number of an element is not changed, when it emits __________ radiations.
22967. Which of the following is not a naturally occurring nuclear fuel ?
22968. An electron has a mass that is approximately __________ that of the proton.
22969. Which of the following fractions of a crude oil will have the maximum gravity API (i.e. °API) ?
22970. For gasoline, the flash point (<50°C) is determined by the
22971. Flash point of atmospheric distillation residue is determined by __________ apparates.
22972. Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about
22973. Pour point and freezing point is equal for
22974. Smoke point of a test sample of kerosene is found to be 15 mm. On removal of __________ from it, the smoke point rises to 25 mm.
22975. __________ is not an important refinery process for upgrading the quality of lubricating oil.
22976. Pick out the undesirable property for a solvent meant for dewaxing of lube oil.
22977. Which of the following is used as a catalyst in fluidised bed catalytic cracking ?
22978. Casing head gasoline is the liquid
22979. Most commonly used crude heater before the fractionation tower in a refinery is the __________ heater.
22980. Viscosity index of a lubricating oil
22981. Visbreaking process is used mainly for making
22982. Operating condition in the electrical dehydrators for crude oil is about
22983. Crude oil is pumped by a __________ pump.
22984. Solvent used in the deasphalting process is
22985. A good lubricant should have high
22986. Complete removal of __________ from gasoline is done by Unisol process using caustic soda and methyl alcohol.
22987. The main use of heavy gas oil produced by the vacuum distillation unit is as a
22988. Stabilisation of gasoline (petrol) means
22989. In petroleum refining, the process used for conversion of hydrocarbons to aromatics is
22990. Diesel index.(an alternative index for expressing the quality of diesel) is
22991. Octane number of gasoline is a measure of its
22992. Pick out the additive property of a lube oil out of following.
22993. Catalyst used in catalytic reforming is
22994. Tanks used for the storage of petroleum products (which are inflammable) should be painted with a __________ paint.
22995. Cetane number of diesel used in trucks may be about
22996. __________ test is done to find out the softening point of bitumen.
22997. __________ determination is not a very significant and important test for gasoline.
22998. Which of the following has the lowest viscosity (at a given temperature) of all?
22999. Mercaptans are
23000. Paraffin base crude oil as compared to asphalt base crude gives