Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Inorganic Chemical – Cryogenics
1 - Question
Cryogenics deals with which type of product?
a) High temperature
b) Low temperature
c) High pressurize
d) Low pressurize
View Answer
Explanation: Cryogenics in chemical technology, deals with the production and utilization of low temperature in the region from absolute zero to 123 kelvin.
2 - Question
Which operation mentioned below is associated with Claude cycle?
a) External refrigeration
b) Three- stage cascade cycle
c) High-speed expander
d) Low speed expander
View Answer
Explanation: In the Claude cycle, a fraction of the gas is expanded in a high speed expander. External refrigeration and three- stage cascade cycle is related with Cascades cycle.
3 - Question
What is the use of ammonia in Linde cycle?
a) Precooling
b) Liquefaction
c) Refrigeration
d) Compression of feed stream
View Answer
Explanation: Linde cycle is the use of ammonia for precooling of the feed stream. Liquefaction is possible by compression or a combination of compression and cooling.
4 - Question
Which cycle is used in the production of low purity tonnage oxygen?
a) Linde cycle
b) Claude cycle
c) Kellogg process
d) Linde-Frankl cycle
View Answer
Explanation: The Linde and Claude cycle is used in the liquefaction of gases, kellogg process is to produced high purity oxygen. Thus Linde-Frankl is the only one which is used to produced low purity tonnage oxygen.
5 - Question
What is the amount of CO2 present in the raw materials for production of low purity tonnage oxygen?
a) 0.01-0.03
b) 0.02-0.07
c) 0.94
d) 20.97
View Answer
Explanation: The raw materials for production of low purity tonnage oxygen usually contain 20.97 oxygen, 0.01-0.03 water, 0.94 oxygen and 0.02-0.07 CO2.
6 - Question
What is the major difference between kellogg and Linde-Frankl process?
a) Recuperative heat exchanger
b) Catalytic oxidation chamber
c) Scrubbing tower
d) Refrigeration
View Answer
Explanation: The major difference between the kellogg and Linde-Frankl cycle is the use of a recuperative heat exchanger. These are built in a concentric triple-tube design with high purity oxygen moving through the inner tube, never contacting the air. This is known as recuperative heat exchanger.
7 - Question
Which process does not use air expansion for refrigeration?
a) Claude operated process
b) Elliott process
c) Turbo-reciprocating process
d) Liquefaction process
View Answer
Explanation: A novel process (elliott) does not use air expansion for refrigeration but sets up heat exchange with nitrogen coolant in strictly recuperative heat exchanger. Claude-operated process uses adiabatic expansion of 70-80% of the incoming air.
8 - Question
What is the composition of air entering the cold exchanger in Linde-Frankl cycle?
a) O2 and N2
b) Only N2
c) H2O and CO2
d) Only H2O
View Answer
Explanation: Air containing both H2O and CO2 which must be removed before entering the fractionation column operated at -183 to -195 celsius to prevent plugging in the Linde- Frankl cycle.
9 - Question
In nitrogen production which cycle is used Joule-Thomson cooling principle?
a) Claude cycle
b) Cascade cycle
c) Elliott cycle
d) Linde cycle
View Answer
Explanation: In Linde cycle refrigeration is used by joule thomson cooling in order to increase the temperature drop. In Claude cycle refrigeration is obtained by adiabatic expansion of compressed air in a turbo -reciprocating or rotating expansion machine.
10 - Question
What is 1, 2, 3 represent in the following flow chart?
a) 1-heat exchanger, 2-liquid reservoir, 3-throttle valve
b) 1-liquid reservoir, 2-heat exchanger, 3-throttle valve
c) 1-heat exchanger, 2-throttle valve, 3- liquid reservoir
d) 1-liquid reservoir, 2- throttle valve, 3-heat exchanger
View Answer
Explanation: At starting of Linde cycle exchange of heat of gases with a cold stream is done than this cold gases are allowed to pass through the throttle valve to a low pressure gas, than this cold gases are separated from the gas liquid mixture in reservoir.