Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
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1.
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The dry bulb measures
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a.
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humidity
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b.
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air temperature
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2.
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The web bulb measures
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a.
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humidity
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b.
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air temperature
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3.
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The higher the relative humidity, the __________ evaporation you will get on the gauze.
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4.
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If the air is very dry, then the relative humidity will be ....
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5.
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The more evaporation you have, the ___________ the relative humidity.
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6.
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If the wet bulb temperature is the same as the dry bulb temperature, relative humidity would be
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a.
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0%
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b.
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25%
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c.
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50%
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d.
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100%
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7.
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When you step out of a swimming pool on a windy summer day, you feel cold because of
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a.
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condensation
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b.
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evaporation
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c.
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dew point
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d.
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relative humidity
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8.
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One hundred percent humidity means ...
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a.
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the air is not saturated.
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c.
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the air cannot hold any more moisture.
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b.
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dew point has been reached.
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d.
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there is no moisture in the air.
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9.
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It is ____________ to have the same relative humidity appear at different air temperatures.
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a.
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possible
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b.
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not possible
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10.
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At noon the readings on a sling psychrometer are 18 deg. C for the dry-bulb thermometer and 14 deg. C for the wet-bulb thermometer. What is the relative humidity?
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a.
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64%
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b.
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60%
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c.
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62%
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d.
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66%
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11.
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At 5 pm the psychrometer is used again. The reading on the dry-bulb thermometer is 12 deg. C, and the reading on the wet-bulb thermometer is 11 deg. C. Determine the new relative humidity.
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a.
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57%
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b.
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78%
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c.
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67%
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d.
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88%
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12.
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How did the relative humidity change during the course of the day?
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a.
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It decreased from 14 to 11 deg. C.
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c.
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It increased from noon to 5 pm.
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b.
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It showed no change.
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d.
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None of the above.
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13.
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How was the relative humidity affected by air temperature?
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a.
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Warm air can hold more moisture than cool air.
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c.
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Relative humidity increases when the temperature drops, given the same amount of water vapor in the air.
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b.
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As temperature decreases, relative humidity increases.
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d.
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All of the above.
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14.
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The temperature at noon in Denver, Colorado, was 68 deg. F. What was the temperature in degrees Celsius?
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a.
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55 deg. C
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b.
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41 deg. C
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c.
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20 deg. C
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d.
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64.8 deg. C
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15.
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What is the temperature in degrees Celsius when a room thermometer reads 77 deg. F?
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a.
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25 deg. C
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b.
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32 deg. C
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c.
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45 deg. C
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d.
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77 deg. C
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16.
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The correct formula for converting Fahrenheit to Celsius is
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a.
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C = 9/5 (F-32)
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b.
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C = 9/5 (F+32)
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c.
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C= 5/9 (F+32)
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d.
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C = 5/9 (F-32)
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17.
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The correct formula for converting Celsius to Fahrenheit is
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a.
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F = C x 1.8 +32
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b.
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F = C +32 x 1.8
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c.
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F = 5/9 C +32
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d.
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F = 5/9 C -32
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18.
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What is the relationship between the temperature of the dry-bulb thermometer and relative humidity?
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a.
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As temperature decreases, relative humidity increases.
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c.
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As temperature decreases, relative humidity decreases.
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b.
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As temperature increases, relative humidity increases.
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19.
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The graph shows that when the dry-bulb thermometer is 42 deg. F, the relative humidity is 100%. That is the termperature at which condensation begins. What will the water vapor form as it condenses?
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a.
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ice crystals
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b.
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water droplets
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c.
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snowflakes
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20.
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What is the instrument used to measure relative humidity?
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a.
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thermometer
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b.
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psychrometer
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c.
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barometer
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d.
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anemometer
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