Ignition lag is__________________?

Related Mcqs:

1. Injection lag is_________________?

   A. the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature
   B. time before actual fuel injection and the pump pluger starts to pump fuel
   C. time corresponding to actual injection and top dead center
   D. time corresponding to actual ignition and top dead center
   E. none of the above

2. Ignition quailty of petrol is expressed by___________________?

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

3. 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

4. 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

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

   A. 150°C
   B. 240°C
   C. 370°C
   D. 450°C
   E. more than 500°C.

6. The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________________?

   A. auto ignition
   B. preignition
   C. retarded ignition
   D. accelerated ignition
   E. detonation

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. 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

9. In the case of compression ignition engine, the %age of CO in exhaust gases is________________?

   A. Zero
   B. 5-10%
   C. Depends on load
   D. Considerable percent

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

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