A. 0.124764 meter
B. 0.00023635 meter
C. 0.00002363 meter
D. 0.0000189 meter
When the molecules in a body move with increased speed, it's possible that the body will change from a
A. gas to a liquid.
B. gas to a solid.
C. liquid to a solid.
D. liquid to a gas.
3. If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is
A. 273掳C.
B. 327掳C.
C. 705掳C.
D. 873掳C.
4. The main purpose of the turbine in the turbojet engine is to
A. drive the compressor.
B. compress the air.
C. increase the velocity of the exhaust gases.
D. reduce the temperature of the exhaust gas.
5. 20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. What is the new volume of the gas? (Assume that there's no change in temperature.)
A. 5 cubic inches
B. 10 cubic inches
C. 40 cubic inches
D. 100 cubic inches
6. Unlike other kinds of liquids, volatile liquids
A. ignite readily at a relatively low temperature.
B. flow rapidly at a relatively low temperature.
C. evaporate rapidly at a relatively low temperature.
D. freeze readily at a relatively high temperature.
7. A temperature of 273 K is the temperature at which water
A. boils.
B. lacks any moving molecules.
C. evaporates.
D. freezes.
8. Which of the following takes place in the combustion chamber of a gas turbine engine?
A. Fuel oil is stored with sufficient pressure.
B. Fuel oil is mixed with a proper portion of compressed air.
C. A mixture of fuel oil and compressed air is ignited.
D. Gases are cooled to a desired temperature.
9. How much heat energy is required to raise the temperature of 5 kilograms of coal from 20掳C to 220掳C?
A. 314 J
B. 6,573 J
C. 1,314,718 J
D. 4,187,000 J
10. One degree Celsius indicates the same temperature change as
A. one degree Fahrenheit.
B. one kelvin.
C. 5/9 degree Fahrenheit.
D. 9/5 kelvin.
11. A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (Assume that there's no change in volume.)
A. 1.702 kPa
B. 3.636 kPa
C. 510 kPa
D. 854.46 kPa
12. A temperature of 20掳C is equivalent to approximately
A. -6掳F.
B. 32掳F.
C. 68掳F.
D. 136掳F.
13. If the absolute pressure of a gas is 550.280 kPa, its gage pressure is
A. 101.325 kPa.
B. 277.280 kPa.
C. 448.955 kPa.
D. 651.605 kPa.Need help with this please help?
1) A
(metal shrinkage is between 1% and 7%, as none of the other answers are near 7% it would have to be 1% 0.124764)
2) D
(remember the ice to water? the particles move faster...even faster the water goes to steam? liquid to gas)
3) B
(Temperature C = K - 273.15 so 600K is 326.85 rounded up to 327)
4) B
( Air enters the engine through an inlet and is then slowed down and compressed by a series of compressor blades. The compressed air is then mixed with fuel, typically a petroleum-based liquid similar to kerosene, and burned. The high-pressure gas is exhausted through a nozzle to generate thrust.)
5) C
(20 cubic inches are 5 PSI, double the PSI and get 40 cubic inches) not too sure on that one though.
6) C
(Volatile liquids, liquids with a high vapor pressure or low boiling point)
7) D
(Temperature C = K - 273.15 so K 273 is 0.15C)
8) C
(possibly B too does number 4 not answer it)
9) B
(no idea, even after 3 hours of looking up the properties of coal! just %26quot;guess at B%26quot; i would )
10) C
(Temperature F = C*9/5+32 (1C is 33.8F) so 1C = 5/9 F)
11) B
(235/110)* 400 = 854.545 kpa)
12) C
(Temperature C = F*5/9 -32 so 20C would be 68F)
13) C
(atmospheric pressure + gauge pressure = absolute pressure, since atmospheric pressure is roughly 100 kpa,
we get 550.280 kPa absolute pressure - 100 kpa atmospheric pressure = approx 450.280 kPa gauge pressure.)
To work out Fahrenheit to Celsius add 40, (F to C) multiply by Fraction...(C to F) multiply by the other, subtract 40. and vice versa for Celsius to Fahrenheit or times the degree of temperature by the fraction (C to F is 5/9th's - F to C is 9/5th's) and add or subtract 32 ( C to F is +, F to C is - )
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