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Technical Measurements Flashcards

7 cards from real BOC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Technical Measurements flashcards as text

  1. Which formula estimates sensible heat transfer for standard air in Btu/h?

    Answer: Q = 1.08 × CFM × ΔT

    Sensible heat for standard air is 1.08 × CFM × temperature difference.

  2. A hot water coil has 10 GPM with a 10°F temperature drop. What is the heat transfer?

    Answer: 50,000 Btu/h

    Q = 500 × GPM × ΔT = 500 × 10 × 10 = 50,000 Btu/h.

  3. An AHU mixes 25% outside air at 40°F with 75% return air at 72°F. What is the mixed air temperature?

    Answer: 64°F

    Mixed air = (0.25 × 40) + (0.75 × 72) = 10 + 54 = 64°F.

  4. What does dew point temperature indicate?

    Answer: The temperature at which moisture begins to condense from air

    Dew point is the temperature at which air becomes saturated and water vapor starts to condense.

  5. A Pitot traverse shows a velocity pressure of 0.25 in. w.c. for standard air. What is the approximate velocity?

    Answer: 2,000 fpm

    V = 4,005 × √VP = 4,005 × 0.5 ≈ 2,000 fpm.

  6. On a day with an average outdoor temperature of 45°F, how many heating degree days accrue (65°F base)?

    Answer: 20

    Heating degree days = 65 − 45 = 20.

  7. A facility draws 80 kW of real power and 100 kVA of apparent power. What is the power factor?

    Answer: 0.80

    Power factor = kW ÷ kVA = 80 ÷ 100 = 0.80.