unit 1 review(book) Flashcards
temperature is defined as
a. heat content
b. the level of heat
c. the british thermal unit
d. the absence of cold
b. the level of heat
the standard conditions of water to boil at 212ºF are
a. an atmospheric pressure of 14.696psig
b. an atmospheric pressure of 0psia, or 29.92 in. hg
c. an atmospheric pressure of 0psig, or 29.92 in. hg
d. an atmospheric pressure of 14.696 psia, or 29.92 in. hg
d. an atmospheric pressure of 14.696 psia, or 29.92 in. hg
Fahrenheit, Celsius, Rankine, Kelvin are
a. temperature scales
b. pressure scales
c. btu measurements
d. heat transfer methods
a. temperature scales
under standard conditions, water freezes at
a. 0ºC
b. 10ºC
c. 20ºC
d. 32ºC
a. 0ºC
molecular motion stops at
a. 212ºF
b. -32ºF
c. -460ºF
d. 0ºF
c. -460ºF
one british thermal unit will raise the temperature of
a. 1 gallon of water 1ºF
b. 1 pound of water 1ºF
c. 1 pound of water 1ºK
d. 1 gallon of water 1ºC
b. 1 pound of water 1ºF
in which direction does heat flow
a. from a cold substance to a cold substance
b. from a cold substance to a warm substance
c. from a warm substance to a warmer substance
d. from a warm substance to a cold substance
d. from a warm substance to a cold substance
- heat transfer from molecule to molecule is known as
a. radiation
b. convection
c. conduction
d. evaporation
c. conduction
an increase in sensible heat causes
a. a higher thermometer reading
b. a lower thermometer reading
c. no change of the thermometer reading
d. ice to melt
a. a higher thermometer reading
latent heat causes
a. a higher thermometer reading
b. temperature to rise
c. a change of state
d. temperature to fall
c. a change of state
heat that is transferred by moving in a medium such as air or water is known as
a. radiation
b. convection
c. conduction
d. evaporation
b. convection
heat that is transferred through space without heating the space and that heats the first solid object that it strikers is known as
a. radiation
b. convection
c. conduction
d. evaporation
a. radiation
specific heat is the amount of heat necessary to raise the temperature of 1lb of which substance 1ºF
a. water
b. air
c. refrigerant
d. any substance
d. any substance
atmospheric pressure at sea level under standard conditions is ___ inches of mercury(hg) or ___ pounds per square inch absolute(psia)
a. 14.696, 29.92
b. 29.92,14.494
c. 0.92, 0
d. 29.99, 0
b. 29.92, 14.696
80ºF is the equivalent of
a. 26.7ºC
b. 35.4ºC
c. 41.2ºC
d. 48.6ºC
a. 26.7ºC
22ºC is the equivalent of
a. 26.7ºF
b. 34.5ºF
c. 71.6ºF
d. 81.4ºF
c. 71.6ºF
to change from psig to psia, you must
a. add 29.92 to psig
b. add 14.696 to psig
c. subtract 0.925 from psig
d. subtract 3.1416 from psig
b. add 14.696 to psig
10 in. hg is equivalent to
a. 10 psia
b. 20 psia
c. 25 psia
d. 30 psia
a. 10 psia
2 psia is equivalent to
a. 29 in. hg
b. 28 in. hg
c. 27 in. hg
d. 26 in. hg
d. 26 in. hg
125 psig is equivalent to
a. 14.696 psia
b. 135 psia
c. 139.7 psia
d. 147.7 psia
c. 139.7 psia
a barometer is used to measure
a. atmospheric pressure
b. gauge pressure
c. absolute pressure
d. stratospheric pressure
a. atmospheric pressure
what size heater will be required to heat the water in a swimming pool from 70ºF to 72ºF in 1 hour if the appliance is 100% efficient and the pool holds 20,000 gallons of water
a. 166,000 btu/h
b. 332,000 btu/h
c. 86,000 btu/h
d. 224,000 btu/h
b. 332,000 btu/h
what size heater will be required to heat the water in a swimming pool from 70ºF to 80ºF in 5 hours if the appliance is 100% efficient and the pool holds 20,000 gallons of water
a. 166,000 btu/h
b. 830,000 btu/h
c. 332,000 btu/h
d. 1,660,000 btu/h
b. 830,000 btu/h
how much pressure is exerted downward by a 50 pound solid object that has a base area of 10 square inches
a. 50 psi
b. 25 psi
c. 10 psi
d. 5 psi
a. 50 psi
