NOCTI Automotive Technology

Question 1

What is the primary function of the crankshaft in an internal combustion engine?

Accepted Answer

Convert reciprocating piston motion into rotational motion

Answer

Regulate fuel delivery to the cylinders

Answer

Control the opening and closing of intake valves

Answer

Circulate engine oil throughout the lubrication system

Question 2

Which gasket seals the combustion chamber between the cylinder head and the engine block?

Accepted Answer

Head gasket

Answer

Intake manifold gasket

Answer

Valve cover gasket

Answer

Oil pan gasket

Question 3

What does the acronym 'OHC' stand for in engine design?

Accepted Answer

Overhead Camshaft

Answer

Oil Heat Control

Answer

Output Hydraulic Circuit

Answer

Operational Hub Connection

Question 4

What is the purpose of the PCV (Positive Crankcase Ventilation) valve?

Accepted Answer

Recirculate crankcase blow-by gases back into the intake manifold

Answer

Boost fuel pressure to the injectors

Answer

Control the idle speed of the engine

Answer

Regulate coolant flow through the radiator

Question 5

When performing a compression test and one cylinder shows significantly lower compression than the others, which component is most likely worn?

Accepted Answer

Piston rings or cylinder wall

Answer

Fuel injector

Answer

Spark plug

Answer

Throttle position sensor

Question 6

Which sensor in the exhaust system measures oxygen content to help the ECM maintain the correct air-fuel ratio?

Accepted Answer

Oxygen (O2) sensor

Answer

MAP sensor

Answer

MAF sensor

Answer

Knock sensor

Question 7

What is the purpose of the timing belt or timing chain in an engine?

Accepted Answer

Synchronize the crankshaft and camshaft rotation

Answer

Connect the alternator to the engine

Answer

Drive the power steering pump

Answer

Control ignition timing electronically