When crude oil is heated, then which of the following hydrocarbon is given off first______________?

Related Mcqs:

1. Cetane number is determined by comparing the performance of diesel oil with the following hydrocarbons___________________?

   A. cetane
   B. mixture of cetane and alphamethyl napthalene
   C. ethylene dibromide
   D. mixture of aldehydes and ketones
   E. mixture of cetane with tetra-ethyl lead

2. Fuel oil consumption guarantees for I .C. engine are usually based on__________________?

   A. low heat value of oil
   B. high heat value of oil
   C. net calorific value of oil
   D. calorific value of fuel
   E. all of the above

3. Volatility of diesel fuel oil is_________________?

   A. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
   B. temperature at which it solidifies or congeals
   C. it catches fire without external aid
   D. indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
   E. temperature at which it flows easily

4. Pour point of fuel oil is the_________________?

   A. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
   B. temperature at which it solidifies or congeals
   C. it catches fire without external aid
   D. indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
   E. temperature at which it flows easily

5. The self-ignition temperature of diesel oil compared to petrol is_________________?

   A. higher
   B. lower
   C. same
   D. depends on quality of fuel
   E. unpredictable

6. Carbon residue in diesel oil should not be more than___________________?

   A. 1%
   B. 0.5%
   C. 0.1%
   D. 0.01%
   E. 0.001%

7. Ignition quality of diesel-fuel oil is expressed by an index called__________________?

   A. octane number
   B. cetane number
   C. calorific value
   D. carbon content
   E. ignition temperature

8. The ash content in diesel oil should bot be more than_______________?

   A. 1%
   B. 5%
   C. 0.1%
   D. 0.01%
   E. 0.001%

9. High carbon content in diesel oil used for diesel engine leads to_________________?

   A. production of highly corrosive gases corroding the cylinder walls and exhaust system
   B. excessive engine wear
   C. damaging of both the storage tank and the engine
   D. deposition on engine parts
   E. none of the above.

10. The pour point of diesel oil must be_________________?

    A. lower than the coldest atmospheric temperature at which oil is to be pumped
    B. higher than above
    C. has no such relation
    D. more than 100°C
    E. none of the above