A. low temperature
B. low density
C. long ignition delay
D. rich mixture
E. all of the above
Related Mcqs:
- The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________________?
A. auto ignition
B. preignition
C. retarded ignition
D. accelerated ignition
E. detonation - To reduce the possibility of knock in the C.I. engines, the first elements of fuel and air should have_______________?
A. high temperature
B. high density
C. short delay
D. reactive mixture
E. all of the above - The spark plug gap is normally maintained at________________?
A. 0.1 to 0.2 mm
B. 0.2 to 0.4 mm
C. 0.45 to 0.6 mm
D. 0.6 to 0.8 mm
E. 0.8 to 1 mm - In petrol engines, advancing the spark timing will_______________?
A. increase the knocking tendency
B. decrease the knocking tendency
C. not affect the knocking tendncy
D. increase or decrease knocking tendency depending on strenght and time of spark
E. unpredictable - Diesel engines as compared to petrol engines require ______________________?
A. bigger flywheel
B. smaller flywheel
C. same size flywheel
D. no flywheel
E. flywheel whose size may be less or more depending on several other fac-tors - The knock in diesel engine occurs due to____________________?
A. instantaneous and rapid burning of the first part of the charge
B. instantaneous atuo iginition of last part of charge
C. delayed burning of the first part of the charge
D. reduction of delay period
E. all ot the above - A fusible plug is fitted in small boilers in order to ___________________?
A. avoid excessive build up of pressure
B. avoid explosion
C. extinguish fire if water level in the boiler falls below alarming limit
D. control steam dome
E. remove molten aslj - The efficiency of I.C. engines normally is of the order of_________________?
A. 15-20%
B. 20-25%
C. 25-30%
D. 30-35%
E. 35-50% - Exhaust pipes of engines are covered with insulating marterial in order to_________________?
A. keep the exhaust pipes warm
B. reduce formation of condenstae
C. reduce heat transfer to the engine room
D. increase engine efficiency
E. conserve heat - The ignition coil in diesel engines produces voltage of the order of________________?
A. 6 to 12 volts
B. 240 volts
C. 1000 volts
D. 20,000 volts
E. 80,000 volts
