Can someone help me Please?

1. The main purpose of the turbine in the turbojet engine is to?

A.Drive the compressor

B.Increase the velocity of the exhaust gases

C. reduce the temperature of the exhaust gas.



2.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.Gases are cooled to a desired temperature.



3.How much heat energy is required to raise the temperature of 5 kilograms of coal from 20 degrees Celsius to 220 degrees Celsius?

A.314 J

B.1,314,718 J

C.4,187,000 J



4.One degree Celsius indicates the same temperature change as?

a.one degree Fahrenheit.

b.one kelvin.

c.9/5 kelvin.



5.Which of the following substances is a liquid fuel used in rocket engines?

A.Ammonia

B.Potassium perchlorate

C.Codium nitrate



6.The density of water is greatest at a temperature of?

A.O K.

B.4 K.

C.277 K.Can someone help me Please?
1. A.

2. B.

3. The specific heat of coal is 3.2 kJ/kg,K, according to this source:

http://www.taftan.com/xl/combus1.htm



3.2 kJ/kg,K * 5kg * 200k = 3200 kJ = 3,200,000 J



I bet the correct answer is C.



4. b.



5. None of those, but if I had to pick one I'd pick ammonia.



Yep, it's ammonia

http://en.wikipedia.org/wiki/Ammonia







6. 277k. Water is more dense as a liquid.Can someone help me Please?
2. delta H= mcdeltaT. you need the specific gravity of coal, c.

4.One Kelvin