Top 50+ Solved Fuel Air Cycles and Actual Cycles MCQ Questions Answer
Q. Dissociation can be considered as
a. disintegration of combustion products at high temperature
b. reverse process of combustion
c. heat absorption process
d. all of the above
Q. Time loss factor in actual cycle is due to
a. Progressive combustion
b. heat loss through cylinder walls
c. gas leakage
d. friction
Q. The major loss in a SI engine is due to
a. exhaust blow down
b. pumping
c. incomplete combustion
d. variation in specific heat and chemical equilibrium
Q. Fuel-air cycle efficiency is less than air-standard cycle efficiency by an amount equal to
a. pumping loss
b. friction loss
c. loss due to specific heat variation and chemical equilibrium
d. exhaust blow down loss
Q. The major loss in a CI engine is
a. direct heat loss
b. loss due to incomplete combustion
c. rubbing friction loss
d. pumping loss
Q. The ratio of the actual efficiency and the fuel-air cycle efficiency for CI engines is about
a. 0.2-0.3
b. 0.5-0.6
c. 1.0
d. 0.6-0.8
Q. In an actual SI engine the pumping loss with respect to speed
a. decreases
b. Increases
c. remains constant
d. nothing to do with speed
Q. The volumetric efficiency is affected by
a. the exhaust gas in the clearance volume
b. the design of intake and exhaust valve
c. valve timing
d. all of the above
Q. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is
a. same
b. less
c. more
d. more or less depending on power rating
Q. In a typical medium speed, 4-stroke cycle diesel engine
a. fuel injection starts at 10° before to dead center and ends at 20° after tor dead center
b. fuel injection starts at top dead center and ends at 20° after top dead center
c. fuel injection starts at just before top dead center and ends just after top dead center
d. may start and end anywhere