A. increase the knocking tendency
B. decrease the knocking tendency
C. not affect the knocking tendncy
D. increase or decrease knocking tendency depending on strenght and time of spark
E. unpredictable
Related Mcqs:
- Diesel engines as compared to petrol engines require ______________________?
A. bigger flywheel
B. smaller flywheel
C. same size flywheel
D. no flywheel
E. flywheel whose size may be less or more depending on several other fac-tors - 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 - 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 - With increase in engine speed, the ignition of spark in petrol engine has to be __________________?
A. Unaltered
B. Increased
C. Decreased
D. Advanced - Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?
A. not true
B. true at full load
C. true at part load
D. true at both part and full load
E. there could not be any such criterion - In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of________________?
A. 0.85
B. 1
C. 1.1 to 1.3
D. 1.2 to 1.5 - For low speed operation or for idling in petrol engines, the engine requirements are for_______________?
A. lean mixture
B. theoretically correct mixture
C. rich mixture
D. any type of mixture
E. lean/rich mixture depending upon capacity of engine - The essential equipment for producing high vlotage for sparking in petrol engines with battery is_______________?
A. ignition coil
B. ignition coil and distributor
C. ignition coil and condenser
D. ignition coil and contact breaker
E. ignition coil, contact breaker and con-denser - The air-fuel ratio in petrol engines-is controlled by__________________?
A. controlling valve opening/closing
B. governing
C. injection
D. carburettion
E. scavenging and supercharging - 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.
