Deck 5: Automobile Engine Fuel Systems

Question 1

The choke is closed when the engine is

A)accelerating
B)hot
C)cold
D)idling

Answer 1

cold

Question 2

Lean air mixture is required during

A)idling
B)starting
C)accelerating
D)cruising

Answer 2

cruising

Question 3

The limits of air-fuel for SI engine are

A)8/1 to 18/1
B)8/1 to 50/1
C)25/1 to 50/1
D)50/1 to 100/1

Answer 3

8/1 to 18/1

Question 4

For maximum thermal efficiency, the fuel-air mixture in SI engines should be

A)lean
B)rich
C)stoichiometric
D)may be rich or lean

Question 5

During starting petrol engines require

A)stoichiometric mixture
B)lean mixture
C)rich mixture
D)any air-fuel ratio is alright

Question 6

Economizer is used to provide enriched mixture during

A)Starling
B)idling
C)cruising
D)full throttle operation

Question 7

When the throttle is suddenly opened, the mixture of the simple carburetor tends to become

A)rich
B)lean
C)stoichiometric
D)not affected

Question 8

Precise petrol injection system is

A)direct injection
B)sequential injection
C)throttle body injection
D)port injection

Question 9

The choke in an automobile meant for supplying

A)lean mixture
B)rich mixture
C)stoichiometric mixture
D)weak mixture

Question 10

Modern carburetors provide the correct quality of air-fuel mixture during

A)starting
B)idling
C)cruising
D)all conditions

Question 11

A simple carburetor supplies rich mixture during

A)starting
B)idling
C)cruising
D)accelerating

Question 12

Fuel injector is used for

A)gas engines
B)CI engines
C)SI engines
D)none of the above

Question 13

Advantage of air injection system is

A)cheaper fuels can be used
B)mep is high
C)fine atomization and distribution of the fuel
D)all of the above

Question 14

Commonly used injection system in automobiles is

A)air injection
B)solid injection
C)combination of (a) and (b)
D)none of the above

Question 15

Fuel injection pressure in solid injection system is around

A)<10 bar
B)10-20 bar
C)30-50 bar
D)200-250 bar

Question 16

Fuel filters do not use generally

A)oil
B)paper
C)cloth
D)felt

Question 17

Fuel is injected in a four-stroke CI engine

A)at the end of suction stroke
B)at the end of expansion stroke
C)at the end of compression stroke
D)at the end of exhaust stroke

Question 18

Injection system in which the pump and the injector nozzle is combined in one housing is known as

A)common rail system
B)distributor system
C)unit injector system
D)individual pump and nozzle system

Question 19

Main advantage of pintaux nozzle is

A)better cold starting performance
B)ability to distribute the fuel
C)good penetration
D)good atomization

Question 20

the most accurate gasoline injection system is

A)direct injection
B)port injection
C)throttle body injection
D)manifold injection

Question 21

Advantage of fuel injection in SI engine is

A)low initial cost
B)low maintenance requirements
C)increased volumetric efficiency
D)none of the above

Question 22

'MPFI' stands for

A)Multi point fuel injection
B)Multi port fuel injection
C)Manifold point fuel injection
D)Manifold port fuel injection

Question 23

In carburetor, Choke is incorporated

A)Before the venturi
B)After the venturi
C)In the venturi
D)Any of the above

Question 24

The following factors affect the process of carburetion

A)Engine speed
B)The temperature of incoming air
C)The volatility of fuel
D)All of the above

Question 25

In MPFI _____ is used to spray fuel into engine.

A)Engine vacuum
B)Suction pressure of engine
C)Electric pump
D)None of the above