chemical engineering MCQs – Page 379

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

7561. Phosphatic fertiliser is graded based on its _____________ content?
0

A. H3PO4

B. P2O5

C. P2O3

D. PCl5

7562. Maximum nitrogen percentage is in________________?
0

A. Urea

B. Liquid ammonia

C. Ammonium sulphate

D. Calcium ammonium nitrate

7563. In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process___________________?
0

A. Uses lower grade phosphate rock

B. Is very costly

C. Produces lower purity acid

D. Requires lower capital investment in the plant

7564. Temperature and pressure in urea autoclave is_________________?
0

A. 400C and 550 atm

B. 120C and 300 atm

C. 200C and 10 atm

D. 190C and 200 atm

7565. The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about ____________ percent?
0

A. 60

B. 30

C. 95

D. 100

7566. Yield of elemental phosphorous from rock phosphate is about _____________ percent?
0

A. 60-65

B. 2-Jan

C. 40-45

D. 15-25

7567. There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earths surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about _____________ C/km?
0

A. 0.05

B. 6.5

C. 15

D. 1

7568. Steam reforming of naphtha is a source of hydrogen production for nitrogenous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha ?
0

A. 1.5 : 1

B. 3.5 : 1

C. 10:01

D. 15:01

7569. Which of the following fertilisers contains the least percentage of nitrogen ?
0

A. Ammonium sulphate

B. Urea

C. Ammonium phosphate

D. Liquid ammonia

7570. C/H ratio (by weight) of naphtha used in nitrogenous fertiliser making is about_________________?
0

A. 13

B. 20

C. 2

D. 6

7571. Ammonium sulphate can be produced by reacting gypsum with____________________?
0

A. Nitric acid

B. Ammonium carbonate

C. Ammonia

D. None of these

7572. The most suitable fertiliser for accelerating seeding or fruit formation in later stages of plant growth is _____________ fertiliser?
0

A. Phosphatic

B. Nitrogenous

C. Potassic

D. None of these

7573. Nitrogen content of calcium ammonium nitrate (CAN) is _____________ percent?
0

A. 25

B. 10

C. 50

D. 80

7574. The optimum size of the ammonia plant is ______________ tons/day?
0

A. 10

B. 100

C. 1000

D. 1000

7575. Removal of ______________ results from the disinfection of water?
0

A. Bacteria

B. Odour

C. Turbidity

D. Hardness

7576. Pick out the wrong statement?
0

A. Gypsum (CaSO4. 2H2O) is obtained as a by-product in the wet process for manufacture of

B. Phosphate rock when reacted with dilute H2SO4 produces superphosphate

C. Dehydration of ammonium carbamate to produce urea is endothermic

D. Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable

E. ho-phosphoric acid

7577. Tricresyl phosphate is chemically represented as___________________?
0

A. (CH3 C6 H4)3 PO4

B. (NH4)2HPO4

C. NH4H2PO4

D. Ca10(PO4)3F6

7578. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?
0

A. CO

B. SO2

C. CFC (chloro fluoro carbons)

D. NOx

7579. ______________ is the process of killing organism in water ?
0

A. Sterilisation

B. Disinfection

C. Coagulation

D. Sedimentation

7580. Threshold limit value (TLV) of CO in air is _____________ ppm?
0

A. 50

B. 5

C. 2000

D. 5000

Previous Next

Showing 7561 to 7580 of 8709 mcqs