Workbook, Heavy Duty Truck Systems, 6E
Chapter Thirty-Five – Answer Key
1. Technician A says that the latent heat of vaporization can be measured in British thermal
units (Btus). Technician B says that the pressure acting on a liquid changes its boiling
point. Who is correct?
2. Technician A says that a rotary vane compressor uses no sealing rings. Technician B says
that a rotary compressor has an oil sump on its discharge side. Who is correct?
3. What type of electromagnetic clutch is most commonly used in truck air-conditioning
(A/C) applications?
4. The receiver/dryer performs which of the following functions?
5. Which of the following observations through an R-12 sight glass can indicate that the
system is empty?
6. Which of the following should be done before testing the operation of the A/C system?
7. Which fuel is used to fire most APUs found on today’s trucks?
8. Which heat output rating APU should be used in a Class 8 truck equipped with a 60-inch
(1.5 meter) bunk and operated in North American winter conditions?
9. Which type of blower fan is used in most truck heating and ventilation systems?
10. What is the medium used inside a cab heating system heat exchanger core?