2781. __________ of the coal is the basis for Seylor’s coal classification.
Proximate analysis
Ultimate analysis
Caking index
Calorific value
✅ The correct answer is option B.
Chemical Engineering
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2782. Which of the following is unsuitable fuel for producer gas manufacture?
Coke
Anthracite
Coal having low fusion point of its ash
Coal having high fusion point of its ash
✅ The correct answer is option C.
2783. Straight run petrol as compared to methyl/ethyl alcohol has
lower calorific value.
lower octane number.
higher specific gravity.
higher ignition temperature.
✅ The correct answer is option B.
2784. __________ chloride present in crude petroleum as impurity is the most prolific producer of HCl during distillation.
Magnesium
Potassium
Calcium
Sodium
✅ The correct answer is option A.
2785. In case of liquid petrofuels, momentary combustion is observed at its
flash point.
preheating temperature corresponding to viscosity of 25 centistokes.
flame temperature.
fire point.
✅ The correct answer is option A.
2786. Operating temperature and pressure in catalytic reforming is about
1-5 Kgf/cm2 & 200°C.
15-45 Kgf/cm2 & 450-550°C.
50 – 75 kgf/cm2 & 600 – 800°C.
5-10 kgf/cm2 & 150 – 250°C.
✅ The correct answer is option B.
2787. Aniline point is the temperature at which
equal weight of diesel & the aniline are completely miscible.
equal weight of aniline & the test sample are completely miscible.
equal volume of aniline & the test sample are completely miscible.
aniline vaporises.
✅ The correct answer is option C.
2788. Which is the most desirable component of a good quality kerosene ?
i-paraffins
Aromatics
n-paraffins
Naphthenes
✅ The correct answer is option C.
2789. A gaseous fuel in order to develop luminousity on burning, must contain
Carbon monoxide
Hydrocarbons
Hydrogen
Oxygen
✅ The correct answer is option B.
2790. The weathering index of a coal
Gives an idea of the fusion temperature of ash
Is related to its calorific value
Is a measure of its size stability, when stored & exposed to weather
Is a measure of its caking tendency
✅ The correct answer is option C.