Top 350+ Solved Automobile Engineering MCQ Questions Answer
Q. The percentage of heat released from fuel air mixutre, in an internal combustion engine which is converted into useful work is roughly
a. 60 - 64 percent
b. 20 - 25 percent
c. 35 - 45 percent
d. 10 percent
e. 15 - 20 percent
Q. The knocking C.I engines is characterised by the sudden auto-ignition of the mixture
a. at the end of the combustion process
b. in the middle of combustion process
c. at the very beginning of the combustion process
d. none of the above
e. None of the above
Q. The braking system provided on trains is
a. Pneumatic
b. Vaccum
c. Hydraulic
d. Mechanical
e. Air assisted hydraulic
Q. The need for installing new piston rings is determined by checking
a. The gap between the ends of the ring
b. The clearance between cylinder and piston rings
c. The clearance between piston and piston rings
d. The clearance between cylinder and piston
e. The surface of the piston ring
Q. In a Diesel engine, during combustion the pressure may increase at a range of
a. 55-75 atm
b. 10-15 atm
c. 20-30 atm
d. 15-20 atm
e. Depends on engine size and speed
Q. A smoky blue exhaust is due to
a. Burning of oil in combustion chamber
b. Incorrect valve adjustment
c. Excessive air
d. Incorrect tappet adjustment
e. Excessive rich mixture
Q. Differential gear box oil is usually renewed after
a. 1000 km
b. 2500 - 6000 km
c. 10000 - 20000 km
d. 2500 km
e. 6000 km
Q. The tendency of a petrol engine to knock increases by
a. Turbo-charging
b. Cataytic converter
c. Alcohol
d. Addition of lead
e. Super-charging
Q. In S.I. engine if the spark plug deposit indicates black coating of soot, it therefore indicates that the engine has been generally operating on
a. Too rich mixture
b. Most economical mixture
c. Too lean mixture
d. Slightly rich mixture
e. Stoichiometric mixture
Q. Ignition quality of petrol is expressed by
a. Calorific value
b. Octane no
c. Cetane no
d. Mass/volume ratio
e. Alcohol
Q. Petrol engines are also known as
a. S.I. Engines
b. C.I. Engines
c. Steam Engines
d. none of the above
e. None of the above
Q. The air gap between the central electrode and ground electrode of a spark plug is approximately
a. 1 cm
b. 0.5 cm
c. 0.2 cm
d. 0.1 cm to 0.06 cm
e. None of the above
Q. In commercial vehicle layouts engine is located forward, rear or under floor mainly to
a. Minimize the tendency to over turn
b. Reduce the weight of chassis
c. Increase fuel economy
d. Better utilise the space
e. Have better weight distribution
Q. When considerable material must be removed to clean up a cylinder bore, the cylinder should be
a. Glazed
b. Ground
c. Honed
d. Reamed
e. Bored
Q. Wheel base of a vehicle is the
a. Distance between the front tyres
b. Distance between front and rear axles
c. Extreme length of the vehicle
d. The combined width of rear tyres
e. Width of tyres