Question 1
A transit bus roof-mounted A/C unit will not cool. The technician's first step before connecting manifold gauges should be to:
Correct Answer:
Verify the compressor clutch or open-drive belt engages and the evaporator/condenser fans run
Question 2
On a large transit-bus A/C system, refrigerant charge is most accurately set by:
Correct Answer:
Charging by weight to the OEM specification
Question 3
Tech A says R-134a and R-1234yf must never be mixed in the same system. Tech B says each refrigerant requires its own dedicated recovery/recycling equipment and service fittings. Who is correct?
Correct Answer:
Both Tech A and Tech B
Question 4
A high subcooling reading at the condenser outlet on a TXV transit-bus system, combined with a high head pressure, most likely indicates:
Correct Answer:
Refrigerant overcharge or restricted condenser airflow
Question 5
Which lubricant is correct for an R-134a transit-bus A/C compressor specified for PAG oil?
Correct Answer:
Polyalkylene glycol (PAG) oil of the OEM-specified viscosity
Question 1
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About this Exam

Prepare with the ASE H7 HVAC (Transit Bus) Practice Questions - ASE H7 - Heating, Ventilation & Air Conditioning (Transit Bus) Certification Exam practice quiz. This question bank includes 100 questions covering refrigerant, transit-bus, compressor, tech, and says. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ASE H7 HVAC (Transit Bus) Practice Questions - ASE H7 - Heating, Ventilation & Air Conditioning (Transit Bus) Certification Exam

This practice set contains 100 questions from the matching question bank and focuses on refrigerant, transit-bus, compressor, tech, and says. 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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