Related Mcqs:

1. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about ____________________?

   A. 9 : 1
   B. 17 : 1
   C. 23 : 1
   D. 29 : 1

2. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be________________?

   A. 9.5 : 1
   B. 12.5 : 1
   C. 15.5 : 1
   D. 18.5 : 1

3. Thermal efficiency of an internal combustion engine is around ______________ percent?

   A. 8
   B. 35
   C. 65
   D. 80

4. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ?

   A. 0.5
   B. 1
   C. 1/3
   D. 2.5

5. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about _______________ percent ?

   A. 1
   B. 10
   C. 30
   D. 50

6. The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?

   A. 2-5
   B. 18-20
   C. 12-15
   D. 6-12

7. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from _______________ percent ?

   A. 5 to 10
   B. 15 to 25
   C. 45 to 50
   D. 75 to 80

8. _______________ is the hardest oxide and is hence used where high wear resistance at high temperature is required?

   A. Beryllium
   B. Zirconia
   C. Alumina
   D. Magnesia

9. Half life of a radioactive isotope corresponds to the time required for half of the _______________ to decay ?

   A. Atoms
   B. Neutrons
   C. Nucleons
   D. Electrons

10. ______________ the exhaust gas is an indication of the incomplete combustion of fuel?

    A. Low temperature of
    B. High temperature of
    C. High % of CO in
    D. High % of CO2 in