Top 250+ Solved Internal Combustion Engines (I.C. Engines) MCQ Questions Answer
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
Q. The amount of heat liberated by complete combustion of unit quantity of fuel is known as________
a. Agitation
b. Combustion
c. Calorific value
d. Thermogenesis
Q. The calorific value of gaseous fuels is expressed in terms of
a. kcal
b. kcal/kg
c. C. kcal/m²
d. D. kcal/m3
Q. What is the significance of calorific value?
a. Helps in deciding which fuel is good
b. Helps in locating fuel
c. Helps in deciding ignition temperature
d. Helps in deciding fire point
Q. Which gas has the highest calorific value among given option?
a. Oxygen
b. Helium
c. Hydrogen
d. Nitrogen
Q. Which calorimeter is used to find calorific values of solid and liquid fuels?
a. Boy’s calorimeter
b. Bomb calorimeter
c. Junker’s calorimeter
d. Calvet-type calorimeter
Q. Which calorimeter is used to find calorific values of gaseous fuels?
a. Bomb calorimeter
b. Junker calorimeter
c. Adiabatic calorimeter
d. Isothermal titration calorimeter
Q. What is the factor on which, difference between the two heating values of fuel depends on?
a. Physical properties
b. Reactants
c. Chemical composition
d. Products