Trivia Quiz On Engine Mechanical System!

The statement is true because mechanical testing is a systematic process that involves evaluating the performance and functionality of mechanical systems or components. By conducting mechanical testing, it becomes possible to identify any potential issues or faults in the system. This can be done by analyzing the performance data, conducting visual inspections, or using specialized tools and equipment. Once the location of the problem is identified, further testing and analysis can be done to determine the cause of the fault. Overall, mechanical testing plays a crucial role in diagnosing and resolving mechanical problems.

A leak heard from the associated part of the compression chamber will lead you to the bad sealing component.

All engines should be disabled by removing fuel delivery from the engine.

During a running compression test, the engine is running and the compression is measured in each cylinder. A burned exhaust valve would be revealed because it would result in a loss of compression in the affected cylinder. Similarly, a badly worn camshaft lobe would also cause a loss of compression, as it would prevent the valve from opening and closing properly. Therefore, both A and B would be revealed during a running compression test.

This is false. When conducting a leak down test, the cylinder needs to have a piston at TDC of the compression stroke.

To perform a power balance test, either the ignition or the fuel can be disabled.

Both pounds per square inch (psi) and kilopascals (kPa) are units of measure that can be used when testing engine compression and cylinder leakage. These units measure the pressure exerted on the engine and can indicate any leaks or issues with the compression in the cylinders. Using both units allows for flexibility and compatibility with different testing equipment and standards.

The needle oscillations are an indication of an internal mechanical fault, which occurs as rapidly as the engine turns.

The cranking compression between the lowest and highest cylinder readings on an engine without mechanical problems should be within 10%. This means that there can be a maximum difference of 10% in compression levels between the lowest and highest cylinder readings. If the difference exceeds 10%, it may indicate potential mechanical issues within the engine.

A power balance test will lead you to the cylinder that is misfiring.

The head gasket is shared between cylinders and, without any other indicators, is the most likely cause of leakage.

Tech B is correct. In a cranking compression test, the first compression pulse should read at least half as much as the final reading. This is because the first pulse indicates the initial compression of the engine, while the final reading represents the maximum compression achieved. Therefore, Tech B's statement is accurate.

A running compression test measures the compression pressure in the cylinders while the engine is running. This test can help identify any issues with the sealing capability of the valves, rings, and pistons. It can also detect problems such as bad piston rings. Therefore, all of the options mentioned in the question can be measured by a running compression test, making the correct answer "None of the above."

A wet compression test validates the seal provided by the piston rings.

The batter needs to be at full capacity to get sufficient engine speed, and you should attempt to get 5 pulses in each cylinder when performing the test.