1. The choke in an automobile meant is for supplying ___________
a) lean mixture
b) rich mixture
c) stoichiometric mixture
d) weak mixture
Explanation: rich mixture
2. Modern carburettors provide the correct quality of air-fuel mixture during ___________
a) starting
b) idling
c) cruising
d) all of the mentioned
Explanation: Modern carburettors provide the correct quality of air-fuel mixture during all the conditions of starting, idling and cruising.
3. The air fuel ratio of the petrol engine is controlled by ___________
a) carburetor
b) injector
c) governor
d) none of the mentioned
Explanation: The air fuel ratio of the petrol engine is controlled by carburetor while the injector is used to inject fuel and governor is inside engine.
4. To prevent blockage of the nozzle by dust particles, the gasoline is filtered by installing a ______________ at the inlet to the float chamber.
a) choke
b) fuel strainer
c) nozzle
d) none of the mentioned
Explanation: fuel strainer
5. The strainer consist of ___________
a) a fine wire mesh
b) cone shaped filtering device
c) cylindrical shaped filtering device
d) all of the mentioned
Explanation: The strainer may consist of a fine wire mesh or other types of filtering device, cone shaped or cylindrical shaped.
6. The function of a float chamber in a carburetor is to supply the fuel to the nozzle at a ___________
a) constant volume head
b) constant pressure head
c) variable pressure head
d) none of the mentioned
Explanation: The function of a float chamber in a carburetor is to supply the fuel to the nozzle at a constant pressure head and not at constant volume or variable pressure.
7. The main metering system of the carburetor controls the fuel feed for ___________
a) cruising
b) full throttle operations
c) all of the mentioned
d) none of the mentioned
Explanation: all of the mentioned
8. The main metering system of the carburetor consists of ___________
a) the fuel metering orifice through which fuel is drawn from the float chamber
b) the main discharge
c) the passage leading to the idling system
d) all of the mentioned
Explanation: all of the mentioned
9. What is the functions of the main metering system?
a) to proportion the fuel-air mixture
b) to decrease the pressure at the discharge nozzle exit
c) to limit the air flow at full throttle
d) all of the mentioned
Explanation: all of the mentioned
10. The throttle regulates the output of the engine by ________________ the quantity of charge going into the cylinder.
a) constant regulating
b) varying
c) increasing
d) none of the mentioned
Explanation: varying