Turbocharger turbine wheel speed is affected by the

• Vacuum during intake cycle.

• exhaust gas speed.

• engine drive belt tension.

• Crankshaft pulley speed.

If the waste-gate failed to operate in a turbocharged engine, the next level of safety device used is known as

• thermal switch.

• dump valve.

• warning light.

• governor valve.

Main difference between a turbocharger and a supercharger is that

• a turbocharger uses exhaust gas to drive its impeller pump.

• the velocity of air leaving the turbocharger is much greater than supercharger

• a turbocharger loads the engine of about 40% of the power output.

• the amount (volume) of air pumped by the turbocharger is greater per min.

What is the disadvantage of a turbocharger compared to a supercharger?

• Turbo under-spin problem.

• Turbo intake exhaust gases into manifold.

• Consume engine energy.

• Turbo lag problem.

Which device is used in a turbocharged engine to control excessive boost pressure?

• Waste Gate.

• Air filter Assembly.

• Boost pressure control unit.

• Exhaust system.

The purpose of intercooler is to

• produce over boost.

• cool the air after it has been pressurized.

• allow higher engine speed.

• reduce the amount of air that can enter the engine.

The likely causes of under-boost pressure in the turbocharged engine is a faulty

• solenoid valve.

• mass air flow sensor.

• stuck closed wastegate.

• stuck open wastegate.

Turbo lag may be reduced by all the following except

• variable-geometry turbocharger.

• making the rotating parts lighter.

• using one larger turbocharger.

• making the rotating parts smaller.

One of the advantages of turbocharging an engine is

• improve operation at high altitude.

• higher fuel consumption.

• higher engine idling speed.

• the engine is more complicated.

One of the precautions to be observed when operating a turbocharger engine is not to

• let the engine idle for too long.

• run the engine at high speed for a long time.

• re-start the engine immediately after stopping.

• run the engine at high speed immediately after starting.