A. Unaltered
B. Increased
C. Decreased
D. Advanced
Related Mcqs:
- 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 - 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 - 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. - 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 - 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 - An engine has a normal speed of 960 r.p.m. and no load speed of 1000 r.p.m. The speed droop of governor will be about___________________?
A. 2%
B. 4%
C. 8%
D. ±4%
E. 1%. - In petrol engines, advancing the spark timing will_______________?
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 - A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?
A. more efficient
B. less efficient
C. equally efficient
D. unperdictable
E. other factors will decide it - Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided__________________?
A. it is properly designed
B. best quality fuel is used
C. can not work as it is impossible
D. flywheel size is proper
E. engine cooling is stopped - The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?
A. same
B. more
C. less
D. less or more depending on operating conditions
E. unpredictable
