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

Related Mcqs:

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

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

2. The operation of forcing additional air under pressure in the engine cylinder is known as________________?

   A. scavenging
   B. turbulence
   C. supercharging
   D. pre-ignition
   E. dissociation and carburretion of fuel

3. In order to prevent knock in the S.I. engines, the charge away from the spark plug should have___________________?

   A. low temperature
   B. low density
   C. long ignition delay
   D. rich mixture
   E. all of the above

4. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the________________?

   A. exhaust will be smoky
   B. piston rings would stick into piston grooves
   C. exhaust temperature will be high
   D. engine starts overheating
   E. scavenging occurs

5. The spark plug gap is normally maintained at________________?

   A. 0.1 to 0.2 mm
   B. 0.2 to 0.4 mm
   C. 0.45 to 0.6 mm
   D. 0.6 to 0.8 mm
   E. 0.8 to 1 mm

6. The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed____________________?

   A. 80°C
   B. 120°C
   C. 180°C
   D. 240°C
   E. 320°C

7. 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

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. The most popular firing order in case of four cylinder in-line I.C. engine is__________________?

    A. 1-2-3-4
    B. 1-3-2-4
    C. 1-4-2-3
    D. 1-2-4-3
    E. 1-3-4-