LV07 Test 4

A compression ignition engine produces a lot of black smoke from the exhaust when accelerating. The most likely cause of this fault is:

• blocked injector

• maladjusted throttle linkage

• restricted air filter

• restricted fuel filter

Pinking occurs when:

• the engine valve timing is set to an advanced position

• the engine is running below its normal operating temperature

• the flame front travels too slowly across the combustion chamber

• the end gases in the combustion chamber self ignite

The position of an oxygen sensor is found as part of:

• an open loop system, in the exhaust manifold after the catalytic convertor

• a closed loop system, in the exhaust before the catalytic convertor

• a closed loop system, in the exhaust manifold after the catalytic convertor

• an open loop system, in the exhaust before the catalytic convertor

Which piece of equipment is used to check the dynamic ignition timing on a spark ignition system?

• a thermo-couple light

• a probe light

• a stroboscope light

• a test light

An after-cooler is used to cool the:

• inlet air to decrease its density

• exhaust gas to decrease NOx content

• exhaust gas to increase NOx content

• inlet air to increase its density

The fuel pressure in a common rail fuel system can be checked by connecting a pressure gauge to:

• the fuel return line and running the engine

• the fuel rail and running the engine

• the inlet side of the fuel pump

• an injector pipe and running the engine

The starter is rotating but the engine stays stationary, one possible fault could be:

• low cylinder compression

• open circuit starter solenoid

• worn flywheel ring gear

• open circuit starter relay

The communication network system shown in the diagram is called a:

• multiplex system

• multi-ECU system

• main controller system

• pulse width modulation system

The engine coolant is contaminated by engine oil in a compression ignition engine. This could be caused by:

• worn piston oil control rings

• internal leakage of the oil cooler

• worn piston compression rings

• crankshaft oil seal leaking

A turbo-charged engine starts and idles but stalls when the revs are increased. One possible cause could be:

• a defective enrichment device

• a defective coolant temperature sensor

• a blocked air intake

• the fins of the inter cooler blocked