Top 250+ Solved Internal Combustion Engines (I.C. Engines) MCQ Questions Answer
Q. The air fuel ratio required for the efficient operation of a three approximately
a. 5:1
b. 10:1
c. 15:1
d. 20:1S
Q. Which stage of vehicle emission norms presently applicable in India in Internal CombustionEngine?
a. Bharat Stage V
b. Bharat Stage IV
c. Bharat Stage III
d. Bharat Stage II
Q. Which of the following is one of the major exhaust emissions from CI engines compared toSI engines?
a. Oxides of nitrogen
b. Particulates
c. CO and CO2
d. Unburnt hydrocarbon
Q. Which of the following causes the photochemical smog?
a. Excess O2
b. CO and CO2
c. Soot and particulate matter
d. NOx and HC
Q. During which condition of the vehicle does NOx emission in SI engine will be lowest?
a. Cruising
b. Idling
c. Accelerating
d. Decelerating
Q. For what purpose is the Rhodium used?
a. To reduce CO and HC
b. To reduce NOx
c. To reduce CO
d. To reduce HC
Q. Why are lead compounds added in petrol?
a. Reduce knocking
b. Reduce HC emission
c. Reduce exhaust temperature
d. Increase power output
Q. Scavenging air in diesel engine means
a. air used for combustion sent under pres-sure
b. forced air for cooling cylinder
c. burnt air containing products of com-bastion
d. air used for forcing burnt gases out of engine's cylinder during the exhaust period
Q. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?
a. yes
b. no
c. to some extent
d. unpredictable
Q. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency iscalled
a. net efficiency
b. efficiency ratio
c. relative efficiency
d. overall efficiency
Q. Compression ratio of LC. Engines is
a. the ratio of volumes of air in cylinder before compression stroke and after compression stroke
b. volume displaced by piston per stroke and clearance volume in cylinder
c. ratio of pressure after compression and before compression
d. swept volume/cylinder volume
Q. A perfect engine works on the Carnot cycle between 727 °C and 227°C. The efficiency of the engine is
a. 0.5
b. 0.75
c. 1
d. 0.25
Q. The air standard Otto cycle consists of
a. two constant volume and two isentropic processes
b. two constant pressure and two isentropic processes
c. two constant pressure and two constant volume processes
d. none of the above