2023 Board Exam Review - AB Power Engineering

It occurs when the combustion of the air and fuel mixture in the cylinder starts off correctly in response to ignition by the sparkling plug, but one or more pockets of mixture explode outside the region of the normal combustion front.

• Knocking

• Diesel knock

• Pre-ignition

• Spontaneous ignition

The greatest heat loss for a 4-stroke cycle, spark ignition engine with a thermal efficiency of 23% is attributed to:

• friction

• exhaust gases

• cooling system

• radiation

A turbine and an air blower mounted ahead of the intake manifold of an engine to force more air into the cylinder thereby increasing power output of the engine by 10-15%.

• Turbocharger

• Governor

• Power inducer

• Auxiliary reducer

SAE number is an indicator of:

• maximum tire load

• oil viscosity

• brake horsepower

• fuel utilization efficiency

An engine that burns fuel inside the cylinder.

• Stirling Engine

• Steam Engine

• ECE

• ICE

What is the indicated horsepower of a four-stroke, six-cylinder having a 4'' bore and 4'' stroke? The engine speed is 1500 rpm and the mean effective pressure is 80 psi.

• 35 hp

• 55 hp

• 50 hp

• 45 hp

The sequence by which the cylinder delivers the power stroke.

• Firing order

• Cylinder arrangement

• Flash point

• Ignition

How many times the intake valve opens in a 4-stroke-cycle engine running at 2000 rpm?

• 2000

• 1500

• 1000

• 500

It is the utilization of hand tools, implements for draft animals, and mechanically-powered machines for agricultural land development, production, harvesting and non-farming processing.

• Agricultural machinery and equipment

• Agricultural development

• Agricultural mechanization

• Agricultural production

Two-stroke, six-cylinder internal combustion engine has a cylinder bore of 4'' and a stroke of 4''. If the engine is running at a speed of 1500 rpm, what is the indicated horsepower of the engine? The mean effective stroke is 80 psi.

• 85 hp

• 92 hp

• 80 hp

• 102 hp