1. The scales formed during the removal of harmful impurities can be removed by __________
a) electrolysis
b) electroplating
c) electrotyping
d) dehydration
Explanation: The corrosion is will be there if there is presence of magnesium chloride or sodium chloride salts in crude oil and forms scales. These scales can be removed by dehydration process.
2. During refining the petroleum, in fractional distillation, what is the temperature in still?
a) 800oC
b) 400oC
c) 300oC
d) 100oC
Explanation: The crude oil is distilled and later it is sent into the pre-heater or else it can be heated with steam, inside the still the temperature is about 400oC.
3. Which of the following fraction obtained on distillation used in dry cleaning?
a) petroleum ether
b) heavy oil
c) gas oil
d) naphtha
Explanation: Naphtha is used for dry cleaning. It is also called as solvent spirit. Heavy oil is mainly used in producing gasoline by cracking method.
4. What is the catalyst used in catalytic polymerization?
a) Phosphoric acid
b) Al2O3
c) Al2(siO3)3
d) Zirconium oxide
Explanation: Phosphoric acid is used as catalyst in catalytic polymerization and Al2O3 , Al2(siO3)3 are used as catalysts in catalytic thermal cracking.
5. Which of the following reactions indicates the Fischer-tropsch method?
a) nC+H(2n+2) → CnH(2n+2)
b) nC+H2n → CnH2n
c) nCO+2nH2 → CnH2n+nH2O
d) nC+H(2n-1) → CnH(2n-1)
Explanation: The equation nCO+2nH2 → CnH2n+nH2O represents the Fischer-tropsch method, here the catalyst used is Ni or CO. The other three reactions indicates the Bergius process or hydrogenation of coal.
6. What is the catalyst used in Bergius process?
a) nickel oleate
b) phosphoric acid
c) zirconium oxide
d) aluminum oxide
Explanation: In Bergius process the catalyst used is Nickel oleate. In this process the low ash coal is finely powdered and turned into a paste using heavy oil and the catalyst is taken into temperature.
7. What is the pressure applied during hydrogenation of coal?
a) 200-280atm
b) 200-250atm
c) 300-380atm
d) 300-350atm
Explanation: A pressure of 200-250atm is applied in Bergius process for one hour 30 minutes.In polymerization the pressure of 70-350kg/cm2 is applied.
8. The boiling range of un-condensed gas is ___________
a) < 300C
b) < 400C
c) > 500C
d) < 200C
Explanation: The boiling range of un-condensed gas must be very low that is less than 30oC. As the gases are un-condensed they are ready to condense and become steam. So, a small amount of heat is sufficient to boil them.
9. Heavy oil on refractionation produces _________
a) Asphalt
b) diesel oil
c) grease
d) kerosene oil
Explanation: Heavy oil on refractionation produces grease. It also produces lubricating oil, petroleum jelly, paraffin wax.
10. How much percentage of petrol is produced by the synthesis of coal?
a) 40%
b) 50%
c) 80%
d) 30%
Explanation: 30% of petrol is produced from the synthesis of coal. Coal is mainly utilized in producing electricity and petrol.50% of petrol is produced form the process called cracking.