Millwright-Engines Exam Questions With Verified Answers
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Course
Millwright
Institution
Millwright
Millwright-Engines Exam Questions
With Verified Answers
What is the purpose of a coolant bypass tube when referring to thermostats? - answerTo
reduce warm-up time and prevent cylinder head from over heating
What must be done to the air/fuel mixture on a gasoline system before it enters the cyli...
Millwright -Engines Exam Questions With Verified Answers What is the purpose of a coolant bypass tube when referring to thermostats? - answer✔✔To reduce warm -up time and prevent cylinder head from over heating What must be done to the air/fuel mixture on a gasoline system before it enters the cylinders? - answer✔✔The carburetor vaporizes the liquid gasoline and mixes it with the incoming air to provide the correct air -fuel mixture. Running __________ = not enough power, increase in temperature (like a turb o boost). The air fuel ratio will change, eg) from 14:1 to 16:1. - answer✔✔too lean (more air) After performing any work on a diesel fuel system you must, ___________ before running. (filters, injectors, injector pump, etc.) - answer✔✔bleed all the air out The purpose of __________ is to atomize the fuel and spray it into the cylinder at the correct time. - answer✔✔injectors What is the main difference between gas and diesel engines? - answer✔✔Because of the high compression ratio (16:1 - 20:1), this gives a high air temperature which can ignite the fuel without a spark. How is a diesel engine timed? The injection pump delivers fuel under high pressure at the correct moment to the injectors. Running ___________ =high emissions (O2 sensors), high exhaust tem peratures. The air:fuel ratio will change, eg) from 14:1 to 12:1 - answer✔✔too rich (more fuel) What is the purpose of a vaporizer on an LPG system? V - answer✔✔vaporize the liquid propane to a gas by a pressure drop and by heating the liquid with warm eng ine coolant. What are some causes of detonation? - answer✔✔Low octane fuels, Timing set to early, Lean fuel mixtures, Improper cooling. Ideally you should place the rain gaps - answer✔✔180* apart and 45* to the wrist pin Spark plug is threaded into the? A. Cylinder B. Block C. Combustion chamber D. Piston - answer✔✔C. Combustion chamber To be sure that lifting attachment does not damage engine accessories it is best to use? A. Spreader bar B. Equalizer C. Softeners D. Bridal - answer✔✔Spreader bar When you take an exhaust or intake manifold pressure reading with a monometer you must? A. Run idle speed B. Half speed C. At full load At full speed unloaded - answer✔✔C. At full load What is the name of the engine component that controls the opening and cl osing of the valves? - answer✔✔Camshaft The _________ may push directly on the valve stem (OHC), or may push on the valve through a lifter, pushrod and rocker arm assembly (in block design) to control the opening and closing of the vavles in a engine. - answer✔✔camshaft What is the purpose of the rocker arm? - answer✔✔Are moved by the pushrods to operate the valves. What is the purpose of the pushrod? - answer✔✔It transmits the camshaft motion from the lifter to the rocker arm. To ensure a longer life in a closed liquid cooling system you should? A. Have conditioners in coolant B. Use pure glycol C. Use pure water D. Use fresh water - answer✔✔A. Have conditioners on the coolant
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