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Difficulty: EasyNegative Detail Identification

The P-100 is a commercial diesel engine-driven portable pump designed for shipboard firefighting and dewatering operations. It provides a nominal discharge rating of 100 gallons per minute at 83 psi when operating with a suction lift of 20 feet. The unit features an air-cooled, single-cylinder four-stroke diesel engine that runs exclusively on standard military diesel fuel (DFM) or JP-5 jet fuel. To prevent engine overheating during extended operations, the cooling system utilizes ambient air drawn through an intake shroud by an engine-mounted flywheel fan. Operators must prime the pump casing manually using an exhaust-gas-driven ejector assembly before commencing liquid discharge.

According to the passage, which of the following is NOT true regarding the P-100 portable pump?

  1. A
    The pump casing must be primed manually with an exhaust-gas-driven ejector assembly before discharge.
  2. The engine is cooled by circulating seawater directly through the engine block during operation.Answer
  3. C
    The engine is capable of running on JP-5 jet fuel in addition to standard military diesel fuel.
  4. D
    The unit delivers a nominal discharge rate of 100 gallons per minute at 83 psi.

Answer

The statement claiming that the engine is cooled by circulating seawater directly through the engine block is not true based on the passage.
The statement describing seawater cooling contradicts the passage, which explicitly describes the engine as an 'air-cooled' unit that relies on 'ambient air drawn through an intake shroud by an engine-mounted flywheel fan.' Therefore, it is the only untrue statement.

Step-by-Step Solution

1
Identify the negative qualifier in the question stem.
The prompt requires finding the statement that is NOT supported or is contradicted by the passage.
Recognizing the negative keyword ensures filtering for false or unmentioned details rather than true ones.
2
Cross-reference each option against the explicit facts provided in the text.
The passage confirms the use of an exhaust-gas-driven primer, fuel compatibility with JP-5 and DFM, and the 100 gpm at 83 psi discharge rate. However, it explicitly states the engine is 'air-cooled' and utilizes 'ambient air drawn through an intake shroud by an engine-mounted flywheel fan.'
Systematic verification isolates the factually contradicted detail.
3
Select the contradicted claim as the correct response.
The claim regarding seawater cooling directly contradicts the text's description of an air-cooled system.
The contradicted statement correctly satisfies the negative identification criteria.

Key Concept

Negative Detail Identification
Estimated Time:45s
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Negative Detail Identification

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