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- Question
Rivets are generally specified by the
Options- A. head diameter
- B. shank diameter
- C. overall length
- D. none of these
- Correct Answer
- shank diameter
- 1. Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately
Options- A. 32
- B. 37
- C. 45
- D. 50 Discuss
- 2. When a bare thermocouple is covered by a protective sheath, the response becomes
Options- A. faster and oscillatory.
- B. faster and non-oscillatory.
- C. slower and oscillatory.
- D. slower and non-oscillatory. Discuss
- 3. 'Wobbe index' is a characteristic of
Options- A. solid fuels
- B. gaseous fuels
- C. liquid fuels
- D. fat coals Discuss
- 4. Which of the following does not come under the category of 'secondary nutrient' for plant growth?
Options- A. Calcium
- B. Magnesium
- C. Sulphur
- D. Oxygen Discuss
- 5. Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is
Options- A. more than 100
- B. round about 100
- C. between 50 and 100
- D. less than 25 Discuss
- 6. Asphalts are
Options- A. low molecular weight & low boiling point compounds present in petroleum.
- B. desirable in catalytic cracking feedstock, because they produce coke.
- C. readily oxidisable and form carbonaceous sludge.
- D. all (a), (b) & (c). Discuss
- 7. The main reaction in reforming is the
Options- A. dehydrogenation of naphthenes.
- B. hydrogenation of naphthenes.
- C. hydrocracking of paraffins.
- D. saturation of olefins. Discuss
- 8. Which of the following reactions is undesirable in the production of catalytically reformed gasoline?
Options- A. Dehydrogenation of naphthene
- B. Dehydrogenation of lower paraffins
- C. Dehydrocyclisation of higher paraffins
- D. Isomerisation of paraffins Discuss
- 9. Schedule number of a pipe, which is a measure of its wall thickness, is given by
Options- A. 1000 P'/S
- B. 100 P'/S
- C. 1000 S/P'
- D. 10000 P'/S Discuss
- 10. Waxes present in petroleum products
Options- A. can be separated out by distillation.
- B. are not soluble in them.
- C. crystallise out at low temperature.
- D. decrease their viscosity. Discuss
More questions
Correct Answer: 32
Correct Answer: slower and non-oscillatory.
Correct Answer: gaseous fuels
Correct Answer: Oxygen
Correct Answer: more than 100
Correct Answer: readily oxidisable and form carbonaceous sludge.
Correct Answer: dehydrogenation of naphthenes.
Correct Answer: Dehydrogenation of lower paraffins
Correct Answer: 1000 P'/S
Correct Answer: crystallise out at low temperature.
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