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Automotive Servicing NC III Practice Questions - TESDA Automotive Servicing NC III Competency Assessment Exam

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About this Exam

Prepare with the Automotive Servicing NC III Practice Questions - TESDA Automotive Servicing NC III Competency Assessment Exam practice quiz. This question bank includes 100 questions covering technician, vehicle, engine, cause, and transmission. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

Sample Questions

Question 1
While diagnosing a rough idle on a vehicle equipped with an Electronic Fuel Injection (EFI) system, a technician connects an oscilloscope to a magnetic inductive crankshaft position (CKP) sensor. What waveform pattern should be observed on the screen as the engine runs?
A continuous digital square wave switching between 0V and 5V
An analog sine wave with amplitude and frequency that increase as engine speed increases
A constant DC voltage that drops steadily as engine speed increases
A pulse-width modulated (PWM) duty-cycle signal that varies between 0V and 12V
Question 2
A vehicle retrieves Diagnostic Trouble Code (DTC) P0171 (System Too Lean - Bank 1). The technician notes that the Short-Term Fuel Trim (STFT) is +18% at idle, but decreases to +2% at 2,500 RPM. What is the most likely cause of this condition?
A fuel pump with low volume output or restricted fuel filter
A vacuum leak in the intake manifold downstream of the MAF sensor
A faulty Mass Air Flow (MAF) sensor reporting high airflow at all speeds
One or more fuel injectors stuck open or leaking fuel
Question 3
An oscilloscope is connected to a fuel injector ground control circuit. While monitoring the waveform, the technician observes that the injector pulse width is 1.8 milliseconds (ms) at normal idle, but increases to 12 ms when the throttle is snapped wide open. What does this change indicate?
A faulty PCM injector driver circuit that is failing to control current
Normal PCM operation providing enrichment during rapid acceleration
A short-circuit to ground in the injector wire harness
A high-resistance fault in the injector solenoid coil winding
Question 4
A technician is testing a three-wire Throttle Position Sensor (TPS). With the ignition switch ON (engine off), the voltmeter connected to the signal wire shows 0.5V at closed throttle and sweep-tests smoothly up to 4.5V at wide-open throttle (WOT). How should the technician evaluate these readings?
The sensor is defective because the voltage does not reach a full 5.0V at WOT
The sensor is operating normally and is within typical specifications
There is a short-circuit to ground on the signal wire causing low voltage at WOT
The sensor reference voltage line has excessive resistance
Question 5
An Engine Coolant Temperature (ECT) sensor has a Negative Temperature Coefficient (NTC). How will the sensor's electrical resistance change as the engine warms up from a cold start to normal operating temperature?
The resistance will increase steadily as the temperature rises
The resistance will drop significantly as the temperature rises
The resistance will remain constant, but its output frequency will change
The resistance will fluctuate rapidly between high and low values

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Additional Information

Automotive Servicing NC III Practice Questions - TESDA Automotive Servicing NC III Competency Assessment Exam

This practice set contains 100 questions from the matching question bank and focuses on technician, vehicle, engine, cause, and transmission. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Frequently Asked Questions

This quiz contains a total of 100 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.

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