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Unit 35 - Quiz

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Unit 35 Comfort and Psychrometrics
Neil Revollo
Quiz by Neil Revollo, updated more than 1 year ago
Neil Revollo
Created by Neil Revollo almost 10 years ago
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Question 1

Question
What is the relative humidity if the dry-bulb temperature is 100ºF and the wet-bulb temperature is 65ºF?
Answer
  • 13%
  • 33%
  • 43%
  • 63%

Question 2

Question
The wet-bulb depression is __________.
Answer
  • the difference between the dry-bulb and wet-bulb temperatures.
  • the same as the wet-bulb temperatures.
  • the same as the dry-bulb temperatures.
  • when the air is saturated with moisture.

Question 3

Question
Comfort can be described as the gentle balance between __________.
Answer
  • air cleanliness, air movement, temperature, and humidity.
  • air velocity, air cleanliness, humidity, and air movement.
  • air speed, air velocity, temperature, and humidity.
  • acceleration, air cleanliness, filtration, and humidity.

Question 4

Question
Infiltration is the term used when referring to the air entering a structure _________.
Answer
  • through an air make-up unit
  • around doors and windows
  • through ventilation
  • because of street traffic

Question 5

Question
A fresh air intake is necessary to keep the indoor air from becoming _________.
Answer
  • too humid
  • superheated
  • oxygen starved and stagnant
  • too dry

Question 6

Question
The dry-bulb temperature is the __________.
Answer
  • same as the wet-bulb temperature
  • total of the sensible and latent heat
  • sensible heat level of the air
  • sensible heat less the humidity

Question 7

Question
If the dry-bulb temperature is 93ºF and the wet-bulb temperature is 60ºF, what is the specific volume of the air?
Answer
  • 14.0 ft^3/lb
  • 14.0 lb/ft^3
  • 10 lb/ft^3
  • 10 ft^3/lb

Question 8

Question
The human body is comfortable when the heat produced in the body is equal to the heat lost to the surroundings.
Answer
  • True
  • False

Question 9

Question
The rate at which water will evaporate from the wick on the wet-bulb thermometer is determined by the moisture content of the surrounding air.
Answer
  • True
  • False

Question 10

Question
Introduction of forced ventilation in the winter heating season helps to raise the humidity level.
Answer
  • True
  • False

Question 11

Question
When the dry-bulb and wet-bulb temperatures are the same, the relative humidity of the air is [blank_start]100%[blank_end].
Answer
  • 100%

Question 12

Question
Air consists of approximately [blank_start]21%[blank_end] of oxygen.
Answer
  • 21%

Question 13

Question
[blank_start]7,000[blank_end] grains of moisture equals one pound of water.
Answer
  • 7,000
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