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WorksheetsENVIRONMENTAL INSTRUMENTS IN PUBLIC HEALTH
Total questions: 5
Worksheet time: 3mins
When a wet and dry bulb psychrometer is read to determine relative humidity:
The dry bulb will read lower than the wet bulb
The two thermometers may read the same
The wet bulb will read lower than the dry-bulb
A formula may be employed to relate the wet-bulb reading to relative humidity
The dry and wet bulb reading always have a difference of 5 Deg Ceicius
Identify the instrument
chloroscope
rain gauge
dulcian
barometer
hygrometer
A chart from which the "predicted four-hour sweat rate" (P4SR) can be obtained from any combination of?
dry and wet bulb temperature of the air,
mean radiant air temperature
air velocity,
All of the above
The chart cannot be made from these combinations.
---------- protects thermometer from radiant heat?
Robertson screen
Shepherdson screen
Rogerson screen
Stevenson screen
Jefferson screen
At what rate is sling psychrometer whirled to get a correct reading?
for 15 seconds at the rate of 4 revolutions / second, ( about 5m/s)
for 30 seconds at the rate of 14 revolutions / second, ( about 7m/s)
for 10 seconds at the rate of 8 revolutions / second, ( about 8m/s)
for 20 seconds at the rate of 10revolutions / second, ( about 5m/s)
for 15 seconds at the rate of 20 revolutions / second, ( about 15m/s)
