Engineering Questions with Answers - Multiple Choice Questions
Unit Processes MCQ’s – Hydrogen : Properties
1 - Question
Hydrogen gas is the lightest gas?
a) True
b) False
View Answer
Explanation: it is the lightest gas, it will diffuse or leak where other heavier gases will not, particularly at high pressure.
2 - Question
Which of the following is the disadvantage(s) of hydrogen?
a) Inflammability
b) Leaking
c) Explosive limit
d) All of the mentioned
View Answer
Explanation: A leak not only means a loss of hydrogen but is, in addition, a decided hazard because of the inflammability and very wide explosive limits that hydrogen possesses. These limits are much wider than for most gases.
3 - Question
Inert gases should be present for what?
a) Prevents heat
b) Prevents explosion
c) High energy
d) All of the mentioned
View Answer
Explanation: All apparatus and lines should be carefully purged by an inert gas such as nitrogen, carbon dioxide, or flue gases not containing oxygen, before hydrogen is admitted to prevent any chances for explosion.
4 - Question
Hydrogen cannot be corrosive.
a) True
b) False
View Answer
Explanation: Hydrogen at elevated temperatures and pressures in contact with ordinary carbon steels is particularly corrosive.
5 - Question
What happens to the tensile strength on removal of carbon in carbon steels?
a) Increases
b) Reduces
c) No change
d) None of the mentioned
View Answer
Explanation: With embrittlement and the removal of carbon, the tensile strength of the steel is greatly reduced.
6 - Question
Which of the following is an example of Alloy steel?
a) Carbon steel
b) Iron
c) Chrome-vanadium
d) All of the mentioned
View Answer
Explanation: Alloy steels are more resistive than carbon steels. Chrome-vanadium, chrome-vanadium-aluminium, chrome-nickel-vanadium-aluminium steels; stainless steels etc.
7 - Question
What is the Ortho: para ration of hydrogen?
a) 1:2
b) 1:3
c) 2:1
d) 3:1
View Answer
Explanation: The nuclear spins may be either parallel or antiparallel, these two forms have been designated “ortho” and “para,” respectively. At normal conditions a ratio of ortho: para of about 3:1 exists. At low temperature the equilibrium is on the side of para-hydrogen.
8 - Question
What is meant by Heavy hydrogen?
a) Deuterium
b) Tritium
c) Hydronium
d) All of the mentioned
View Answer
Explanation: Deuterium is another name for heavy hydrogen. It differs from hydrogen in that its nucleus contains a neutron as well as a proton, making the atom heavier.
9 - Question
What is the use of Mass Spectroscopy?
a) Hydrogen mass
b) Overall mass
c) Hydrogen analysis
d) All of the mentioned
View Answer
Explanation: The mass spectrometer is an excellent method for analysing for hydrogen either in simple or complex mixtures. The majority of instruments used for analysing for hydrogen are based on the thermal conductivity of the mixture in which hydrogen is present.
10 - Question
The thermal conductivity means the rate at which the flowing gas removes heat from an electrically heated wire.
a) True
b) False
View Answer
Explanation: The thermal conductivity is determined by the rate at which the flowing gas removes heat from an electrically heated wire.