Top 250+ Solved Internal Combustion Engines (I.C. Engines) MCQ Questions Answer
Q. Dwell period
a. is directly proportional to engine speed
b. is inversely proportional to engine speed
c. does not depend on engine speed
d. none of the above
Q. If the contact breaker gap is small, it results in
a. advanced timing
b. increased dwell
c. rapid burning of the pointer gaps
d. none of the above
Q. For a four cylinder engine operating at N rpm, the contact breaker must make and break thecircuit
a. N times
b. 2N times
c. N/2 times
d. none of the above
Q. Contact breaker should be set
a. just before starting the engine
b. before adjustment of dwell angle
c. after adjustment of dwell angle
d. before setting spark plug gap
Q. Dwell meter is used for
a. setting spark plug gap
b. contact breaker gap
c. setting the ignition advance
d. setting
Q. For a four cylinder vertical engine, the commonly used firing order is
a. 1-2-3-4
b. 3-4-1-2
c. 1-3-4-2
d. 4-3-2-1
Q. For engine operating with rich mixtures the optimum spark timing
a. must be advanced
b. must be retarded
c. must be at TDC
d. none of the above
Q. For peak lead operation, the spark advance
a. must be decreased
b. must be increased
c. need not be altered
d. none of the above
Q. Ignition timing is adjusted by
a. tachometer
b. stroboscopic light
c. stop watch
d. accurate clock
Q. Vacuum advance mechanism shifts the ignition point under
a. no load operation
b. full load operation
c. part load operation
d. under sudden acceleration
Q. Which of the following statement is wrong?
a. retarded timing causes exhaust gas temperature to be higher
b. retarded timing improves fuel economy
c. retarded timing requires slightly longer throttle opening
d. retarded timing causes burning of the hydrocarbons in the exhaust
Q. Choose the correct statement from the following
a. maintenance problem in magneto-ignition system is more
b. magneto ignition system occupies more space
c. magneto ignition system is used in larger four wheelers
d. magneto ignition system has poor quality of spark during starting
Q. Battery ignition system
a. occupies more space
b. has more maintenance problem
c. is commonly employed in four wheelers
d. all of the above
Q. Method of governing used in petrol engine is
a. hit and miss governing.
b. quality governing
c. quantity governing
d. none of above
Q. Pick up the false statement
a. Thermal efficiency of diesel engine i about 34%
b. Theoretically correct mixture of air am petrol is approximately 15 : 1
c. High speed compression engines operate on dual combustion cycle
d. S.I. engines are quality-governed engines.