Which of the following is mostly used used as blast furnace fuel for extracting pig iron from iron ores?

Related Mcqs:

1. Blast furnace produces following by reduction of iron ore_______________?

   A. cast iron
   B. pig iron
   C. wrought iron
   D. malleable iron
   E. white iron

2. The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?

   A. lean mixture
   B. chemically correct mixture
   C. rich mixture
   D. unpredictable
   E. none of the above

3. Sulphur in pig iron tends to make it___________________?

   A. hard’
   B. soft
   C. ductile
   D. tough
   E. malleable

4. The percentage of carbon in pig iron varies from___________________?

   A. 0.1 to 1.2%
   B. 1.5 to 2.5%
   C. 2.5 to 4%
   D. 4 to 4.5%
   E. 4.5 to 6.3%.

5. Pig iron is the name given to________________?

   A. raw material for blast furnace
   B. product of blast furnace made by reduction of iron ore
   C. iron containing huge quantities of carbon
   D. iron in molten form in the ladles
   E. iron scrap

6. The presence of sulphur in pig iron makes__________________?

   A. it easily machinable
   B. it brittle
   C. it hard
   D. the casting unsound
   E. increases the fluidity

7. Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________?

   A. (1- moisture content)
   B. (1 + moisture content)
   C. 1 + moisture content
   D. 1 – moisture content

8. Which is correct statement about reaction time for autoignition of fuel and the fuel air ratio__________________?

   A. lean mixture has high reaction time
   B. rich mixture has high reaction time
   C. chemically correct mixture has mini-mum reaction time
   D. all of the above
   E. non of the above

9. Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The minimum value occurs in the region of________________?

   A. Lean mixture
   B. Chemically correct fuel air ratio
   C. Rich mixture
   D. Unpredictable

10. The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?

    A. lean mixture
    B. chemically correct mixture
    C. rich mixture
    D. unpredictable
    E. none of the above