Self-ignition temperature of petrol is of the order of___________________?

Related Mcqs:

1. 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

2. The pressure and temperature at the end of compression stroke in a petrol engine are of the order of___________________?

   A. 4 – 6 kg/cm2 and 200 – 250°C
   B. 6 – 12 kg/cm2 and 250 – 350°C
   C. 12 – 20 kg/cm2 and 350 – 450°C
   D. 20 – 30 kg/cm2 and 450 – 500°C
   E. 30 – 40 kg/cm2 and 500 – 700°C

3. Ignition quailty of petrol is expressed by___________________?

   A. octane number
   B. cetane number
   C. calorific value
   D. self ignition temperature
   E. distillation temperature

4. 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

5. Ignition timing of a multicylider petrol engine can be adjusted by_________________?

   A. rotating the crank
   B. adjusting the spark plug gap
   C. adjusting ignition coil position
   D. rotating the distributor
   E. delaying the spark by increasing capacitor in ignition circuit

6. With increase in engine speed, the ignition of spark in petrol engine has to be __________________?

   A. Unaltered
   B. Increased
   C. Decreased
   D. Advanced

7. The theoretically correct air fuel ratio for petrol engine is of the order of___________________?

   A. 6 : 1
   B. 9 : 1
   C. 12 : 1
   D. 15 : 1
   E. 20 : 1

8. The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?

   A. higher
   B. lower
   C. same
   D. depends on size of engine
   E. unpredictable.

9. Auto-ignition temperature 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. that at which it catches fire without external aid
   D. indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
   E. indicated by 50% distillation temperature

10. The ignition coil in diesel engines produces voltage of the order of________________?

    A. 6 to 12 volts
    B. 240 volts
    C. 1000 volts
    D. 20,000 volts
    E. 80,000 volts