Questions
42
LPG when brought to atmospheric pressure & temperature will be a________________?
Answer: Gas heavier than air
43
Gum formation in stored gasoline is mainly due to the ____________________?
Answer: Presence of sulphur
44
Smoke point of a good burning kerosene may be around _______________ mm?
Answer: 20-25
45
Solvent deoiling process is used for separating oil and soft wax from hard wax. Methyl isobutyl ketone and methyl ethyl ketone (MEK) are two commonly used deoiling solvents. Use of former as the deoiling solvent has the advantages of the____________________?
Answer: All A., B. & C.
46
Which of the following has the highest flash point of all ?
Answer: Furnace oil
47
Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about _______________ °C ?
Answer: 90
49
Hydrocracking employs ___________________?
Answer: High pressure & temperature
51
Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic____________________?
Answer: Reforming
52
‘Solvent naphtha’ used mostly as a solvent in paints and perfumery is produced by the _________________ of virgin naphtha into small boiling range cuts?
Answer: Distillation
53
Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its_________________?
Answer: Both A. & B.
54
Octane number (unleaded) of gasoline produced by isomerisation of butane may be about __________________?
Answer: 70
55
Molecular weight of crude petroleum may be around________________?
Answer: 1500
56
The characterisation factor of crude petroleum oil is around__________________?
Answer: 11
57
True vapour pressure of a petroleum fraction ________________ Reid vapour pressure?
Answer: May be either more or less than
58
Flash point of diesel/kerosene (>50°C) is determined by the_______________?
Answer: Abel apparatus
59
Which of the following is desirable in diesel and kerosene but is undesirable in gasoline ?
Answer: Aromatics
60
Cetane number of alpha methyl naphthalene is assumed to be_________________?
Answer: 0
