Category: I.C. Engines

A. reduce cost
B. improve surface finish
C. prevent clogging
D. reduce wear and eliminate scuffing
E. improve heat transfer

A. feed petrol into cylinder
B. govern the engine
C. break up and mix the petrol with air
D. heat up the charge to cylinder
E. scavenge the cylinder

A. 180°
B. 125°
C. 235°
D. 200°
E. 275°

A. same
B. more
C. less
D. less or more depending on operating conditions
E. unpredictable

A. the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture
B. fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
C. only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
D. fuel is injected at atmospheric pres¬sure
E. there are no valves.

A. gas engine
B. 2-stroke S.I. engine
C. 4-stroke S.I. engine
D. steam engine
E. 4-stroke C.I. engine

A. For petrol and large gas engines, quantity governingds preferred
B. In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load
C. In hit and miss governing, fuel supply is completely cut off during one or more number of cycles
D. In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied
E. For close regulation of speed, combination of both quality and quantity governing is used

A. enhanced by increasing compression ratio
B. enhanced by decreasing compression ratio
C. unaflected by compression ratio
D. first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed
E. dependent on other factors

A. lean mixture
B. theoretically correct mixture
C. rich mixture
D. any type of mixture
E. lean/rich mixture depending upon capacity of engine

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