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Practice questions · 310S B

Diagnoses and repairs engine and engine support systems

2 questions from this exam area, each with the full explanation shown — not just the answer. Free, no account.

17% of the exam

1

A technician uses an inductive amp clamp to test a glow plug circuit and finds a total current draw of 80 amps on a 4-cylinder engine. What does this likely indicate?

  1. All four glow plugs are working normally.Answer
  2. The glow plug relay is stuck open.
  3. Two of the four glow plugs are burned out (open).
  4. The glow plug circuit is shorted to ground.

Why that is right

A warmed diesel glow plug typically draws about 10 to 20 amps, so a 4-cylinder engine pulling roughly 80 amps averages about 20 amps per plug, indicating all four plugs and their circuits are intact and drawing normally.

Why the other options are wrong

  • The glow plug relay is stuck open. — If the glow plug relay were stuck open (not closing), no current would reach the plugs and the clamp would read about 0 amps, not 80.
  • Two of the four glow plugs are burned out (open). — Two burned-out (open) plugs would remove their share of current, dropping the total to roughly half (about 40 amps), not the full 80.
  • The glow plug circuit is shorted to ground. — A dead short to ground would draw hundreds of amps and blow a fusible link or burn wiring, far above the normal 80-amp reading.

2

The engine oil pan uses a silicone sealer instead of a gasket. Technician A says you cannot wait more that 3 minutes before assembling the pan to the engine. Technician B says you can use either silicone sealer or anaerobic sealer to install the oil pan. Who is right?

  1. A onlyAnswer
  2. B only
  3. Both A and B
  4. Neither A nor B

Why that is right

Tech A is right because silicone sealer is like glue; if you wait too long, the sealer will skin over and not glue the two areas together. Tech B is wrong because anaerobic sealer is only used between machined surfaces.

Why the other options are wrong

  • B only — This endorses Tech B, but RTV silicone and anaerobic sealer are not interchangeable for an oil pan. Anaerobic sealer cures only in the absence of air between two close-fitting rigid machined surfaces; a stamped pan flange does not provide that condition, so it is the wrong sealer choice here.
  • Both A and B — This requires both statements to be right, but Tech B is wrong about sealer interchangeability. Since only Tech A's working-time caution holds, 'Both' is incorrect.
  • Neither A nor B — This rejects both, but Tech A is correct—silicone skins over quickly, so the pan must be assembled within the sealer's open (working) time before it cures. Dismissing a valid statement makes 'Neither' wrong.

Exam-style practice written to the published Red Seal standard. These are not real exam questions — the official Red Seal sample questions are deliberately excluded from everything we publish.

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