Top 350+ Solved Automobile Engineering MCQ Questions Answer
Q. Generally speaking for better efficiency of IC engine the valves must
a. open before the beginning of a stroke and close before the end of a stroke
b. open after the beginning of a stroke and close before the end of a stroke
c. open after the beginning of a stroke and close after the end of a stroke
d. open before the beginning of a stroke and close after the end of a stroke
e. None of the above
Q. The inlet value remains open approximately for
a. 160?
b. 180?
c. 190?
d. 235?
e. None of the above
Q. Maximum danger of ol dilution by fuel in an engine occurs when
a. Engine is running at overload
b. Engine is running at rated load
c. Engine is running on lean mixture
d. Choke circuit is cut in for too long a period
e. All of the above
Q. In the fuel injection pumps for Diesel engine the effective pressure strokes of the plungers in the fuel injection pump are regulated by means of a
a. Camshaft
b. Check valve
c. Needle valve
d. Control rack
e. Fuel pump
Q. A laminated glass upon cracking
a. Bursts into sharp edged fragments
b. Bursts into granular pieces
c. Sandwitched layer traps the fragments
d. Breaks into the form of crystals
e. None of the above
Q. In an internal combustion engine the approximate percentage of the combustion heat that passes to the cylinder walls is
a. 75%
b. 10%
c. 5%
d. 30%
e. 60%
Q. In case of oil bath type air cleaner, the oil sediments formed by the dust must be removed
a. Monthly
b. After about 500 km
c. Weekly
d. After about 5000 km
e. Every day
Q. Which one of the followings is used in S.I. engines?
a. spark plug
b. injector
c. cross-head
d. none of the above
e. None of the above
Q. In a S.I. engine the intake valve closes
a. 35? to 80? after BDC
b. 25? to 80? before BDC
c. At TdDC
d. 10? to 20? before
e. At BDC
Q. In a Diesel engine the duration between the time of injection and the time of ignition is called
a. Spil cut off
b. Delay period
c. Period of injection
d. Period of ignition
e. None of the above
Q. Poor compression in a two stroke engine cannot be due to
a. Leaky valves
b. Broken piston rings
c. Leaking cylinder head gasket
d. Poor fits between pistons, rings and cylinders
e. Any of the above
Q. The angle between the cord and the centre line of the tread is called
a. tread angle
b. side wall angle
c. crown angle
d. none of the above
e. None of the above
Q. A stratified charged engine provides
a. air fuel mixture of different air-fuel ratios at various places on the combustion chamber
b. different air fuel ratios in consecutive strokes
c. different air fuel ratios at different times depending upon the load
d. none of the above
e. None of the above
Q. In a S.I. engine burned white deposit on spark plug with molten globules indicates that the engine has been generally operating on
a. Most economical mixture
b. Slightly rich mixture
c. Stoichiometric mixture
d. Too rich mixture
e. Too lean mixture
Q. Gum content of petroleum fuels is mainly due to
a. concentration of sulphides and disulphides
b. evaporation loss of lighter fractions
c. oxidation of unsaturated bydrocarbons
d. All of the above
e. None of the above