Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about ________________ ppm?

Related Mcqs:

1. Liquefied Petroleum Gas (LPG) in domestic use cylinders is in the liquid form. The density of LPG in liquid form is about ________________ of that of water (i.e. 1 gm/c.c)?

   A. One fourth
   B. One third
   C. Half
   D. One eighth

2. Ethyl mercaptan is a/an ___________________ compound?

   A. Sulphur
   B. Nitrogen
   C. Oxygen
   D. None of these

3. Mercaptans are added to liquefied petroleum gas (LPG) to _____________________ ?

   A. Reduce its cost
   B. Narrow down its explosion limit
   C. Assist in checking its leakage from cylinder
   D. Increase its calorific value

4. Tetra-ethyl lead is added in gasoline to ______________________?

   A. Increase its smoke point
   B. Reduce gum formation
   C. Reduce the pour point
   D. Increase its octane number

5. Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is ________________?

   A. More than 100
   B. Round about 100
   C. Between 50 and 100
   D. Less than 25

6. Liquefied Petroleum Gas (LPG) is mainly a mixture of _____________________?

   A. Propane & butane
   B. Methane & ethane
   C. High boiling olefins
   D. High boiling naphthenes

7. LPG when brought to atmospheric pressure & temperature will be a________________?

   A. Liquid lighter than water
   B. Liquid heavier than water
   C. Gas lighter than air
   D. Gas heavier than air

8. The yield of straight run LPG from crude oil is about ______________ weight percent?

   A. 20-25
   B. 1-1.5
   C. 10-15
   D. 0.1-0.2

9. Liquefied petroleum Gas (LPG) used for the household cooking comprises mainly of _______________?

   A. Propane & butane
   B. Butane & ethane
   C. Methane & ethane
   D. Methane & carbon monoxide

10. 95% (by volume) of LPG at 760 mm Hg pressure will evaporate at __________ °C?

    A. 2
    B. -40
    C. 30
    D. 55