172 part 3

Which one of the following is an important action before removing a spark plug?

• Electrode gap cleaning.

• Electrode gap adjustment.

• Removing dust and debris.

• Coil per plug centralising.

What is the symbol shown in the image?

• Malfunction indicator lamp.

• Ignition charging light.

• Oil warning light.

• Air conditioning light.

What will a blocked air filter cause?

• A reduction in overall engine power output.

• A decrease in carbon monoxide and hydrocarbons.

• An increase in carbon dioxide and nitrogen.

• An increase in carbon monoxide and H₂O.

Which one of the following is a fault that would cause a cooling system to over-pressurise?

• Thermostat opens too late.

• Thermostat opening too soon.

• Recirculation flap stuck closed.

• Head gasket failure between bore and water jacket.

Which one of the following items of equipment is used to check the operational efficiency of a replaced catalytic converter?

• Exhaust gas analyser.

• Exhaust pressure tester.

• Dedicated scanner.

• Graphing meter.

What equipment should be used to switch off the warning symbol in the image?

• Dedicated scanner

• Ohmmeter

• Ammeter

• Oscilloscope

Which one of the following conditions would indicate that a cross flow radiator has a blocked matrix (core)?

• The radiator temperature is the same at both sides.

• The inlet side is much cooler than the outlet side.

• The outlet side is much hotter than inlet side.

• The inlet side is much hotter than the outlet side.

Why do turbocharger shaft bearings require constant cooling to prevent them overheating?

• The exhaust gas flow is reduced causing a rise in temperature.

• The exhaust gas driving the turbine creates a high heat.

• The increase in air pressure causes a high rise in temperature.

•   The prevention of turbine blade failure due to increase in temperature

Why do turbocharger shaft bearings require constant cooling to prevent them overheating?

• The exhaust gas flow is reduced causing a rise in temperature.

• The exhaust gas driving the turbine creates a high heat.

• The increase in air pressure causes a high rise in temperature.

• The prevention of turbine blade failure due to increase in temperature.

What name is given to an air-fuel ratio control system that is monitored by a lambda sensor?

• Fixed loop.

• Controlled loop.

• Permanent loop.

• Closed loop.