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ASE Transit Bus

H7 Transit Bus — HVAC — practice test

Studying for H7 (Transit Bus — HVAC)? Overhaul Prep has 168 verified H7 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

168H7 questions
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9,711questions in total
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Sample H7 questions

Straight from the bank — answers highlighted, with the explanation underneath.

The A/C compressor on most large roof-mounted transit bus HVAC systems is best described as a(n):

  1. Hermetically sealed scroll compressor
  2. Open-drive reciprocating compressor belt-driven by the engine
  3. Sealed rotary-vane compressor built into the transmission
  4. Compressor powered only by the 12-volt chassis battery
WhyTransit bus rooftop systems (e.g., Thermo King, Carrier) use large open-drive reciprocating compressors driven by a belt off the engine, giving the high refrigerant flow needed for a large cabin load. Sealed/hermetic units are used in small self-contained or stationary systems.

Technician A says R-134a and R-22 must never be mixed in the same system. Technician B says a refrigerant identifier should be used to verify an unknown charge before recovering it. Who is right?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyMixing refrigerants creates an unusable, hard-to-reclaim blend with wrong pressures and oil issues; an identifier confirms what is in the system and protects recovery equipment. Both are correct.

A bus A/C compressor clutch rapidly cycles on and off (short-cycles) with weak cooling. The MOST likely cause is:

  1. A low refrigerant charge tripping the low-pressure switch
  2. An overcharge
  3. A plugged cabin-air filter
  4. A stuck-closed water valve
WhyA low charge lets suction pressure fall until the low-pressure switch cuts the clutch; pressure recovers, the clutch re-engages, and the cycle repeats - classic short-cycling from undercharge.

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