Test: Fuel Injection, Ignition & Carburation - 3 - Mechanical Engineering MCQ

2.22 ms

3.22 ms

1.22 ms

0.92 ms

0.1 to 0.2 mm

0.2 to 0.4 mm

0.45 to 0.6 mm

0.6 to 0.8 mm

inject fuel at appropriate time

regulate power

time the spark

even charge distribution to all cylinder

air only

supercharging

liquid fuel and air

liquid fuel only

liquid fuel and air

solid fuel

solid fuel and air

liquid fuel

ignition oil + distributor

ignition coil + condenser

ignition coil + contact breaker

ignition coil + contact breaker + condenser

controlling spark

controlling current produced by the generator

supplying high voltage to the spark plug

avoidance of sparking

Ni - cd battery

dry battery

Ni - Fe battery

lead - acid battery

rectifier

dc to ac converter

switch

step-up transformer

battery

spark plug

distributor-cap carbon brush

distributor-cap terminal which is earthed to the contact breaker to avoid the danger of fire

Contact points are generally of tungsten.

Excessive gap results in rapid burning of points.

Points are opened by the cam and closed by the spring tension.

Spark occurs when the points are open.

Silica

Dolomite

Alumina

Glass

0.001 sec

0.01 sec

0.1 sec

1 sec

Make and break the primary ignition circuit,

Provide rapid collapse and reversal of magnetic field in the coil.

Induce high voltage in the secondary circuit.

Minimise arcing and pitting of contact breaker points.

It is directly proportional to dwell angle.

It is larger for smaller gap between contact- points.

The gap between the contact point is of the order of 0.35 to 0.55 mm.

It is directly proportional to engine speed.

Sparkplug

Ballast

Rotating magnet

Battery

ac generator

dc generator

magnetic coil

transformer

gap between electrode in mm

spark voltage

pitch of plug thread

electrode diameter in cm

spark plug is of too high rating.

mixture is too rich.

the engine is excessively advanced.

too large a gap between the electrodes.

1

1 and 2

2 and 3

1, 2 and 3

long insulation tip

long threaded portion

long path for heat dissipation

is generally used in heavy duty, high speed engines

occupies more space.

has more maintenance problem.

is commonly employed in four wheelers.

all of the above

Retarded timing causes exhaust gas temperature to be higher 

Retarded timing improves fuel economy.

Retarded timing requires slightly longer throttle opening.

Retarded timing causes burning of the hydrocarbons in the exhaust

tachometer

stroboscopic light

stop watch

accurate clock

no load operation

full load operation

part load operation

under sudden acceleration

1, 2, 3 and 4

1 and 4

1, 3 and 4

2 and 4 .

cheaper fuels can be used

mep of high

fine atomization & distribution of the fuel

all of the above

< 10 bar

10 - 20 bar

30 - 80 bar

200 - 250 bar

better cold starting performance

ability to distribute the fuel

uniform penetration

fine atomization

direct injection

port injection

throttle body injection

manifold injection