MHR Sample Exam

HVAC Refrigeration Sample Exam

Mechanical Engineering HVAC & Refrigeration
PE Sample Exam
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HVAC Refrigeration Sample Exam:

Working through sample PE Exam questions is one of the most efficient methods of preparing for exam.

  • Spend time understanding the intent of the question (i.e. what is the question writer actually testing you on)
  • Find useful resources that help answer the questions in the Sample Exam (and similar questions)
  • Assemble your resources into a system that you can use to prepare for the exam

If there is anything I can do for you as you work through this Mechanical Engineering HVAC & Refrigeration PE Sample Exam and as you prepare for the PE Exam, please do not hesitate to ask.

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Sample Exam

You will receive an email with your quiz results and be directed to the solutions
for all the questions after selecting the See Results button at the end of the exam.

You will see references in the solutions
that link to additional information.
We recommend you use the PE Mechanical Reference Handbook
to solve the problem or answer the question and then use the additional information
to strengthen your knowledge of the topic.

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MHR SE01 - An existing 100 hp condenser water pump can be upgraded at a cost of $9,000 and the annual maintenance costs will be $2,500. Or the owner can purchase a new, high-efficiency, 75 hp pump for $30,000 with annual maintenance costs of $1,000 to replace the existing pump. If the pumps both run 24 hours a day, 365 days a year and utility costs are $0.12/kwh, which pump costs less (including maintenance) and what is the savings based on 1 year’s operation?

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MHR SE02 - A 460-volt, 3-phase feeder consisting of three #2/0 AWG wires is supplying a 90 KW load. If the load is balanced and the power factor is 70% lagging, what is the current per phase?

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MHR SE03 - In a simple thermodynamic refrigerant cycle, what state is the refrigerant in between the condenser and the thermostatic expansion valve?

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MHR SE04 - Thermodynamic properties are divided into two types – intensive and extensive. An extensive property depends on size or extent of the system. Intensive properties exist an any point in space. Which of the following are categorized as intensive properties:
I.   Pressure
II.  Temperature
III. Volume
IV. Density

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MHR SE05 - Thermodynamic compression where no heat is transferred in or out is called ___________ compression.

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MHR SE06 - In psychrometrics, Humidity Ratio is defined as ________________ and sometimes called _______________:

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MHR SE07 - Determine the minimum insulation thickness required for a 6” hot water pipe (160°F). The maximum temperature on the outer surface of the insulation can be 100°F. Thermal conductivity of the insulation is 0.25 BTU-in./(hr-ft2-°F). The maximum heat loss from the pipe/insulation is 150 BTUh/ft.

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MHR SE08 - Compressible flow is generally related to fluids that have significant changes in density and Mach numbers higher than 0.3. Which of the following would not be considered a compressible flow?

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MHR SE09 - Using the Darcy-Weisbach equation, calculate the head loss in a 10 ft section of 3” pipe. The Moody friction factor is 0.075, the density of the fluid is 1 lb/ft3, and the velocity of the fluid is 4 ft/sec.

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MHR SE10 - What is the discharge velocity of a 2” pipe discharging water into a reservoir? The water is traveling at 3 ft/sec inside the pipe at 60 psi pressure. Assume no change in elevation.

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MHR SE11 - The total air conditioning load in tons (neglect solar heat gain) for a retail building is most nearly? The building is 100’-0” wide by 200’-0” deep x 16’-0” high has the following characteristics:

  • the 2 sides and the rear of the building have an overall U-value of 0.11 BTU/ft2-hr-°F
  • the front of the building is constructed entirely of storefront glass panels with an overall U-value of 0.51 BTU/ft2-hr-°F
  • the roof has an overall U-value of 0.08 BTU/ft2-hr-°F
  • 75% of the overall floor space is to be used for occupancy and lighting calculations (sales area)
  • the occupancy loading is 66.67 sq. ft per person in the sales area
  • people sensible load is 250 Btuh/person
  • the outside air ventilation requirements are:
    • 5 cfm per person
    • 12 cfm per sq.ft. (sales area)
    • 0.06 cfm per sq.ft. (warehouse area)
  • the lighting load is 3 watts per square foot
  • the overall miscellaneous power is 1 watt per square foot
  • the store is to be maintained at 75°F/50%RH
  • the design day is 97°F/75°F
  • the blow through air handling unit discharge temperature is 56°F and the fan motor heat is 1°F

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MHR SE12 - An air handling unit cooling coil has the following characteristics: 7,500 cfm, 75°F/50%RH entering air temperature, 55°F/90%RH leaving air temperature, 42°F supply chilled water temperature, 52°F return chilled water temperature. Using the Water Vapor in Air chart provided, what gpm of chilled water is required?

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MHR SE13 - In a simple refrigerant system, what is the order of equipment starting with the outdoor unit?

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MHR SE14 - In a direct-expansion air conditioning system, what is the purpose of the refrigerant air dryer?

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MHR SE15 - What is the minimum duct insulation U-value dictated by ANSI/ASHRAE 90.1 for supply ductwork routed in a ventilated attic in climatic zone 4? The ductwork is connected to a heat-pump air-conditioning unit.

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The Mechanical Engineering HVAC & Refrigeration PE Sample Exam is designed to help you prepare for the PE Exam by following these 3 steps:

  1. Work through the information in the Sample Exam … follow the references … dig deep.
    • following the references/links for the problems will expand your knowledge of the subject.
  2. Work as many problems as you can find and note where you have difficulties.
    • working the problems in the Sample Exam plus any additional examples you can find is an excellent test preparation method.
  3. Take the time to put together a comprehensive Test-Prep Resource Library©
    • the Test-Prep Resource Library© is my #1 recommendation for everyone preparing for the PE Exam.

Remember, this is a process. If you will:

  • spend time every day gathering information
  • work the example problems in the Mechanical Engineering HVAC & Refrigeration PE Sample Exam
  • assemble the resources into an organized system

… you will be successful.

Mechanical Engineering HVAC & Refrigeration
PE Sample Exam

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