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

Question 1

A technician is checking the resistance of a diesel glow plug using a digital multimeter. What is the typical resistance value of a good glow plug at room temperature?

Less than 2 ohms (typically 0.5 to 1.5 ohms) Between 10 and 20 ohms Between 50 and 100 ohms Infinite resistance (open circuit)

Correct Answer:

Less than 2 ohms (typically 0.5 to 1.5 ohms)

Question 2

After replacing the fuel filters on a conventional diesel engine, the engine cranks but refuses to start. What is the most appropriate next step?

Bleed the air from the diesel fuel system starting from the lowest pressure point to the highest pressure point. Keep cranking the engine continuously until it starts to build fuel pressure. Spray starting fluid directly into the air intake to force the engine to start. Loosen the fuel tank cap to relieve any vacuum build-up in the tank.

Correct Answer:

Bleed the air from the diesel fuel system starting from the lowest pressure point to the highest pressure point.

Question 3

When installing a spin-on type diesel fuel filter, which procedure should the technician follow to prevent air lock and dry running of the transfer pump?

Fill the new filter with clean diesel fuel before installing it and lubricate the gasket with clean engine oil or diesel. Install the filter dry, then crank the engine for 30 seconds to prime the system. Coat the filter threads with thread locker and tighten it with a filter wrench as hard as possible. Leave the filter half-full of water to allow the water separator to function immediately.

Correct Answer:

Fill the new filter with clean diesel fuel before installing it and lubricate the gasket with clean engine oil or diesel.

Question 4

What is the primary difference in combustion chamber design between a direct injection (DI) diesel engine and an indirect injection (IDI) diesel engine?

In DI engines, fuel is injected directly into a combustion chamber formed in the piston crown, whereas IDI engines inject fuel into a small pre-chamber. DI engines use spark plugs for combustion, whereas IDI engines rely purely on heat of compression. DI engines inject fuel into the intake manifold, whereas IDI engines inject fuel directly into the cylinder. DI engines have the fuel injectors mounted in the crankcase, whereas IDI engines mount them in the cylinder head.

Correct Answer:

In DI engines, fuel is injected directly into a combustion chamber formed in the piston crown, whereas IDI engines inject fuel into a small pre-chamber.

Question 5

A diesel passenger vehicle emits heavy black smoke from the exhaust during acceleration. What is the most likely cause of this symptom?

An excessive amount of fuel relative to available air (rich mixture) due to a restricted air intake or faulty injectors. Coolant leaking into the combustion chamber due to a blown cylinder head gasket. Engine oil leaking past the valve stem seals or piston rings into the combustion chamber. The fuel tank containing a high concentration of gasoline instead of diesel fuel.

Correct Answer:

An excessive amount of fuel relative to available air (rich mixture) due to a restricted air intake or faulty injectors.

Question 1

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

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

This practice set contains 100 questions from the matching question bank and focuses on engine, technician, diesel, primary, and fuel. 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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Automotive Servicing NC I Practice Questions - TESDA Automotive Servicing NC I Competency Assessment Exam

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