A. increase efficiency
B. increase power
C. reduce weight and bulk for a given out-put
D. effect fuel economy
E. none of the above
Related Mcqs:
- Supercharging is the process of_____________________?
A. supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
B. providing forced cooling air
C. injecting excess fuel for raising more load
D. supplying compressed air to remove combustion products fully
E. raising exhaust pressure - Pick up the wrong statement about supercharging __________________?
A. supercharging reduces knocking in diesel engines
B. there can be limited supercharging in petrol engines because of detonation
C. supercharging at high altitudes is essential
D. supercharging results in fuel economy
E. supercharging is essential in aircraft engines - Supercharging is essential in_____________?
A. diesel engines
B. gas turbines
C. petrol engines
D. aircraft engines
E. marine engines - 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 ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of____________________?
A. 5:25:30:50
B. 25:35:5:35
C. 25:5:10:60
D. 40:30:15:15
E. 25:5:35:35 - The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?
A. more
B. less
C. same
D. more upto some load and then less
E. it may be less or more depending on several other factors - For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________?
A. about twice
B. about 0.5 times
C. nearly equal
D. about 1.7 times
E. about 5 times - Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________?
A. Supercharged
B. Not supercharged
C. Charged
D. Supercharged provided its speed is low - With increase in engine speed, the ignition of spark in petrol engine has to be __________________?
A. Unaltered
B. Increased
C. Decreased
D. Advanced
