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General Diagnosis Questions in Automotive Repair, Exams of Advanced Education

A series of diagnostic questions and scenarios related to various automotive systems, including the starter motor, battery, cooling system, fuel injection, and engine performance. The questions cover a range of topics, such as voltage drop testing, cylinder compression, valve adjustment, belt inspection, battery testing, starter current draw, timing control, obd-ii guidelines, and cooling system inspection. The document aims to assess the knowledge and troubleshooting skills of automotive technicians by presenting them with multiple-choice questions and asking them to identify the correct or most likely answer. By analyzing this document, students and professionals in the automotive repair field can gain insights into common diagnostic procedures, system interactions, and problem-solving techniques used in the industry.

Typology: Exams

2024/2025

Available from 09/29/2024

cate-mentor
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Download General Diagnosis Questions in Automotive Repair and more Exams Advanced Education in PDF only on Docsity! GENERAL DIAGNOSIS QUESTIONS A voltage drop test of the starter motor control circuit is being performed as shown in the figure. With the ignition disabled, the engine is cranked over with the voltmeter on the lowest scale. Technician A says that a reading below 2.5 volts is okay. Technician B says that if a reading above 1 volt is obtained, individual components in the circuit will need to be tested to find the problem. Who is correct? - A only - B only - Both A and B - Neither A nor B - B only The LEAST LIKELY cause of low cylinder compression is: - worn valves - worn rings - blown head gasket - worn valve guides - worn valve guides Technician A says valve adjustment should always be performed on a cold engine. Technician B says the piston should be placed at TDC of the compression stroke. Who is correct? - A only - B only - Both A and B - Neither A nor B - B only Referring to the figure, Technician A says a deteriorated belt could cause squealing and chirping. Technician B says belt deflection should be under 1/2 inch (12.7 mm) per foot (30.5 cm) free span. Who is correct? - A only - B only - Both A and B - Neither A nor B - Both A and B All statements are true about adjusting valves EXCEPT: - mechanical lifters are adjusted by rotating the nut on the rocker arm until the specified clearance is achieved - after hydraulic lifters are pumped up, adjust by rotating the nut until the specified clearance is achieved - use a feeler gauge for mechanical lifters - the piston should be at top dead center - after hydraulic lifters are pumped up, adjust by rotating the nut until the specified clearance is achieved Technician A says installing a rebuilt alternator in a vehicle with a weak battery without recharging the battery may cause premature alternator failure. Technician B says a battery open circuit voltage reading of 12.6 volts indicates the battery is good and fit for service. Who is correct? - A only - B only - Both A and B - Neither A nor B - A only A low-pitched roaring noise is being diagnosed. The noise disappears when the accessory drive belt is removed. Technician A says the belt tensioner pulley bearing should be checked for roughness. Technician B says the alternator bearing should be checked for roughness. Who is correct? - A only - B only - Both A and B - Neither A nor B - Both A and B During cranking, Technician A says battery voltage should be no more than 5 volts. Technician B says cranking voltage does not matter, as long as the engine starts. Who is correct? - A only - B only - Both A and B - Neither A nor B - Neither A nor B Technician A says when testing a circuit, the voltage drop during cranking should not exceed 3.5 volts. Technician B says individual voltage drop tests on control circuit components may be necessary. Who is correct? - A only - B only - Both A and B - Neither A nor B - B only High current draw and low cranking speed usually indicate: - excessive resistance in the starter circuit - a defective battery - a gauge reading of 100 percent indicates no cylinder leakage - air loss from the exhaust indicates a valve problem - a gauge reading of 100 percent indicates no cylinder leakage During a cylinder power balance test, there is no rpm drop on cylinder 3. Technician A says that the cylinder is not contributing. Technician B says that the cylinder may have an inoperative spark plug. Who is correct? - A only - B only - Both A and B - Neither A nor B - Both A and B A 4-cylinder engine is making a loud metallic knocking that gets louder as the engine warms up or if the throttle is quickly snapped open. The noise almost disappears when the spark for cylinder number 3 is shorted to ground. Technician A says the symptoms indicate a cracked flywheel. Technician B says the symptoms indicate a loose connecting rod bearing. Who is correct? - A only - B only - Both A and B - Neither A nor B - B only A proper cooling system inspection involves all of the following EXCEPT: - pressure test - cooling fan inspection - evaporator core inspection - thermostat inspection - evaporator core inspection Refer to the scope patterns in the illustration. Technician A says the two patterns indicate current ramping. Technician B says the number 2 pattern on the right shows a shorted injector. Who is correct? - A only - B only - Both A and B - Neither A nor B - Both A and B When testing voltage drop while cranking the engine with the ignition disabled, Technician A says the voltage drop on the positive battery cable should be no more than 5 volts. Technician B says the voltage drop on the positive battery cable should be no more than 1 volt. Who is correct? - A only - B only - Both A and B - Neither A nor B - Neither A nor B Technician A says a high resistance connection at the alternator electrical connector could cause excessive heat buildup in the connector. Technician B says a connector that is too tight can cause heat distortion. Who is correct? - A only - B only - Both A and B - Neither A nor B - A only While performing engine noise diagnostics, Technician A says a stethoscope is a good tool for noise location. Technician B says you may have to duplicate the specific operating condition. Who is correct? - A only - B only - Both A and B - Neither A nor B - Both A and B The vacuum gauge shows a fluctuating motion from 15 to 21 in. Hg at idle. Technician A says this could be caused by a loose exhaust manifold. Technician B says this could be caused by a burned valve. Who is correct? - A only - B only - Both A and B - Neither A nor B - B only A vehicle is being diagnosed for an overheating complaint while at cruising speeds. Technician A says the electric cooling fan may be defective. Technician B says that the radiator may have some damaged cooling fins. Who is correct? - A only - B only - Both A and B - Neither A nor B - B only