Engineering Questions with Answers - Multiple Choice Questions
Rocket Propulsion – Liquid Fuels
1 - Question
_________ is not liquid fuel.
b) Furfuryl alcohol
c) Hydrazine hydrate
d) Nitric acid
Explanation: Nitric acid is not a fuel, but and oxidizer. HNO3 is also used as a very strong oxidizing agent in chemical reactions.
2 - Question
Which of the following is not a liquid fuel?
b) Ethyl alcohol
d) Hydrogen peroxide
Explanation: Hydrogen peroxide (H2O2) acts as an oxidizer. Ammonia (NH3), ethyl alcohol (C2H5OH), and Borohydrides (containing BH4–) are liquid fuels.
3 - Question
Petroleum derivatives are mainly ___________ chemicals.
Explanation: Petroleum derivatives are hydrocarbon chemicals. This means that it is a compound made up of hydrogen and carbon.
4 - Question
Which of the following is not a hydrocarbon fuel?
c) Turbojet fuel
d) Ethyl alcohol
Explanation: Ethyl alcohol is not a hydrocarbon fuel. Kerosene and diesel are petroleum derivatives.
5 - Question
Petroleum fuels form ________ radiating flames.
Explanation: The bright brilliant radiating flames of petroleum fuels are yellow-white in color. Main examples of petroleum fuels include kerosene, gasoline, gaseous fuels like methane, propane, butane etc.
6 - Question
Carbon deposits on the inside of cooling passage can lead to __________
a) decrease in heat transfer and decrease in wall temperature
b) increase in heat transfer and decrease in wall temperature
c) decrease in heat transfer and increase in wall temperature
d) increase in heat transfer and increase in wall temperature
Explanation: Cooling passages by some means may have carbon deposits on its inside. This can lead to a decrease in heat transfer and an increase in the wall temperature. It happens because the operation of cooling passages is inhibited by the carbon deposits and as a result the cooling is ineffective.
7 - Question
Atlas, Delta and Thor rocket engines use __________ fuel along with liquid oxygen.
Explanation: RP-1 is used in Thor, Delta and Atlas rocket engines as a fuel. Oxidizer for this fuel is usually liquid oxygen. RP-1 is a highly refined form of kerosene.
8 - Question
Methane is a __________ fuel.
a) cryogenic hydrocarbon
d) hypergolic hydrocarbon
Explanation: Methane falls under the category of cryogenic hydrocarbon fuels. Using methane or RP-1 have shown to give a small advantage in the performance of initial stages of space launch vehicles.
9 - Question
RP-1 specific gravity at 15°C is __________
Explanation: RP-1 is a highly refined form of kerosene. It is alternatively called as Rocket Propellant-1 or Refined Petroleum-1. It has a specific gravity of 0.80 at a temperature of 15°C.
10 - Question
H2 burns with oxygen with a ________ flame.
Explanation: When H2 burns with oxygen, it produces a colorless flame. In reality, the flame is a pale blue that appears to be invisible in daylight.