Engineering Questions with Answers - Multiple Choice Questions
Applied Chemistry MCQ – Power alcohols as Fuels
1 - Question
Power alcohols contains ________
a) 50-60% of petrol
b) 70-80% of petrol
c) 50-60% of ethanol
d) 70-80% of ethanol
View Answer
Answer: b
Explanation: When ethyl alcohol is used in internal combustion engines then it is called as power. So, it contains 70-80% of petrol and 20-25% of ethanol.
2 - Question
Alcohol can absorb __________
a) traces of water
b) traces of impurities
c) traces of dust
d) traces of carbon
View Answer
Answer: a
Explanation: Alcohol has the power to absorb the traces of water present in petrol as it dissolves in water.
3 - Question
Ethyl alcohol reduces the _________
a) oxygen emissions
b) efficiency
c) polluting emissions
d) nitrogen emissions
View Answer
Answer: c
Explanation: Ethyl alcohol contains nascent oxygen atoms that reduce the pollutants like CO and other hydro carbons.
4 - Question
Power alcohol is _______ than petrol.
a) bad product
b) less efficient
c) costlier
d) cheaper
View Answer
Answer: d
Explanation: Power alcohol is cheaper than petrol. It is the main advantage of the power alcohols made them to be fuels.
5 - Question
Main disadvantage of the power alcohol is _______
a) starting troubles
b) more cost
c) increases foreign currency
d) increases octane number of petrol
View Answer
Answer: a
Explanation: The main disadvantages of the power alcohols are starting troubles due to the high surface tension and atomization.
6 - Question
What is the colour of the bio diesel?
a) orange
b) light yellow
c) dark orange
d) light brown
View Answer
Answer: b
Explanation: The bio diesel is light yellow in colour. Most of the power alcohols are yellow in colour as they are hydrocarbons.
7 - Question
The natural gas along with the petroleum is called __________
a) water gas
b) oil gas
c) wet gas
d) heavy oil
View Answer
Answer: c
Explanation: The natural gas along with the petroleum is called as wet gas and water gas is the mixture of the CO and water.
8 - Question
The calorific value of the natural gas is?
a) 1200-1400kcal/m3
b) 500-800kcal/m3
c) 800-900Kcal/m3
d) 12000-14000kcal/m3
View Answer
Answer: d
Explanation: 12000-14000kcal/m3 is the calorific value of the natural gas which is very high value and produces a lot of heat.
9 - Question
Natural gas contains ___________
a) methane=70-90%
b) benzene=40-30%
c) hydrogen=50%
d) methane=80-40%
View Answer
Answer: a
Explanation: The composition of natural gas is: methane=70-90%; benzene=5-10%; CO+Carbon dioxide=remainder.
10 - Question
The calorific value of LPG is _____________
a) 34800kcal/m3
b) 84000kcal/m3
c) 278000kcal/m3
d) 29000kcal/m3
View Answer
Answer: c
Explanation: The calorific value of the LPG is more than that of the natural gas. It is about 278000kcal/m3. So, it is more efficient than the natural gas.
11 - Question
CNG is stored at a pressure of ___________
a) 281-621kg/cm2
b) 482-591kg/cm2
c) 200-248kg/cm2
d) 800-828kg/cm2
View Answer
Answer: c
Explanation: CNG is very light weight gas. So, the storage of the gas is little difficult. So, it is stored at a pressure of 200-248kg/cm2.
12 - Question
Boiling point of LPG is ___________
a) 546k
b) 373k
c) above room temperature
d) below room temperature
View Answer
Answer: d
Explanation: LPG has the property of fast ignition and it needs very less amount of energy to burn that is the heat supplied is very low about the temperature less than that if room temperature.
13 - Question
CNG has high auto-ignition temperature of _______
a) 813k
b) 993k
c) 1163k
d) 1273k
View Answer
Answer: a
Explanation: CNG also have high auto ignition energy and has a calorific value of 900 kJ/mole. Its auto ignition temperature is about 813k.