Deck 6: Fuel Injection and Ignition Systems in Automotive Engineering

Question 1

L-MPFI system uses

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

Answer 1

port injection

Question 2

D-MPFI system uses

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

Answer 2

manifold injection

Question 3

Common rail injection system uses injection pressures of the order

A)100-200 bar
B)200-400 bar
C)400-600 bar
D)1500 bar

Answer 3

1500 bar

Question 4

Continuous injection system usually has

A)plunger pump
B)rotary pump
C)gear pump
D)vane pump

Question 5

The cold start injector

A)maintain stoichiometric air-fuel ratio
B)provides lean air-fuel ratio
C)gives rich air-fuel ratio
D)is not used for any of the above functions

Question 6

ECU is an electronic injection system used for

A)calculating the appropriate injection timing
B)meeting only certain operating conditions
C)closing the injection valve only
D)none of the above

Question 7

With EFI (ELECTRONIC FUEL INJECTION) of diesel engines

A)sharp start and stop is not possible
B)very high injection pressure can be obtained
C)sudden cylinder cut-off is impossible
D)diagnostic properties are poor

Question 8

EFI system can achieve

A)proper injection timing
B)proper injection quantity
C)proper injection pressure
D)all of the above

Question 9

The first vehicle in India equipped with MPFI system in Indian automobile industry

A)Tata Indica
B)Daewoo Matiz
C)Maruti Alto
D)Chevrolet spark

Question 10

The fuel in diesel engine is normally injected at pressure of

A)5-10 kg/cm²
B)20-25 kg/cm²
C)60-80 kg/cm²
D)90-130 kg/cm²

Question 11

The specific fuel consumption per BHP hour for diesel engine is approximately

A)0.15 kg
B)0.2 kg
C)0.25 kg
D)0.3 kg

Question 12

The specific fuel consumption per BH hour for a petrol engine is approximately

A)0.15 kg
B)0.2 kg
C)0.25 kg
D)0.3kg

Question 13

The air-fuel ratio of the petrol engine is controlled by

A)fuel pump
B)governor
C)injector
D)carburettor

Question 14

Pour point of fuel oil is the

A)minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B)temperature at which it solidifies or congeals
C)it catches fire without external aid
D)indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

Question 15

A 5 BHP engine running at full load would consume diesel of the order of

A)0.3 kg/hr
B)1 kg/hr
C)3 kg/hr
D)5 kg/hr

Question 16

The secondary winding of ignition coil consists of

A)few turns of fine wire
B)few turns of thick wire
C)many turns of fine wire
D)many turns of thick wire

Question 17

Dwell is the time

A)for which the points remain closed
B)for which the points remain open
C)time during which inlet and exhaust valves are open
D)none of the above

Question 18

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

Question 19

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

Question 20

For a four cylinder engine operating at N rpm, the contact breaker must make and break the circuit

A)N times
B)2N times
C)N/2 times
D)none of the above

Question 21

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

Question 22

Dwell meter is used for

A)setting spark plug gap
B)contact breaker gap
C)setting the ignition advance
D)setting

Question 23

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

Question 24

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

Question 25

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