MCQOPTIONS
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MCQOPTIONS
This section includes 528 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
SBR is a type of |
| A. | aerobic process |
| B. | activated sludge process |
| C. | anaerobic process |
| D. | chemical process |
| Answer» C. anaerobic process | |
| 52. |
Drop man holes are generally providedin sewers for |
| A. | industrial reas |
| B. | large township |
| C. | hillytownships |
| D. | cities in plains |
| Answer» D. cities in plains | |
| 53. |
The settling velocity of sphericalparticle is given by |
| A. | darcy weisbachequation |
| B. | hazen andwilliam equation |
| C. | stokesequation |
| D. | bernoulli’sequation |
| Answer» D. bernoulli’sequation | |
| 54. |
After how many years, night soil givesgood quality manure? |
| A. | 1 |
| B. | 5 |
| C. | 10 |
| D. | 14 |
| Answer» B. 5 | |
| 55. |
The depth of the filter media ofintermittent filter is |
| A. | 45cm |
| B. | 60cm |
| C. | 20cm |
| D. | 25cm |
| Answer» C. 20cm | |
| 56. |
How many types of settling are there inthe sedimentation tank? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 57. |
How many types of trickling filters areused in sewage treatment? |
| A. | a) |
| B. | 5 |
| C. | 3 |
| D. | 2 |
| Answer» E. | |
| 58. |
The expression of the Chezy’s formulais given by |
| A. | v = c/rs |
| B. | v = crs2 |
| C. | v = c (rs)1/2 |
| D. | v = c/ (rs)1/2 |
| Answer» D. v = c/ (rs)1/2 | |
| 59. |
The color of the secondary sludge produced from the high rate tricklingfilter is |
| A. | gray |
| B. | black |
| C. | brown |
| D. | green |
| Answer» D. green | |
| 60. |
The ditch is lined by layer. |
| A. | brick |
| B. | cement |
| C. | permeable |
| D. | impermeable |
| Answer» E. | |
| 61. |
Which of the following surface has a maximum Kuichling’s impermeability factor? |
| A. | gravel road |
| B. | water tight roof surface |
| C. | unpaved surface |
| D. | macadamized road ways |
| Answer» C. unpaved surface | |
| 62. |
Which of the following filter is used in the anaerobic treatment of sewage? |
| A. | intermittent sand |
| B. | trickling filter |
| C. | contact filter |
| D. | biological filter |
| Answer» E. | |
| 63. |
Conservancy system is a highly unhygienic system, causing insanitary conditions. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 64. |
In which pollution zone of the river, growth of algae reappear? |
| A. | zone of degradation |
| B. | zone of recovery |
| C. | zone of active decomposition |
| D. | zone of clean water |
| Answer» C. zone of active decomposition | |
| 65. |
The water carriage system is a hygienic system without any bad smell. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 66. |
Which of the following factor does noteffect the dry weather flow? |
| A. | rate of watersupply |
| B. | temperatureconditions |
| C. | populationgrowth |
| D. | infiltration ofground water |
| Answer» C. populationgrowth | |
| 67. |
The peaking factor is directly proportional to the population of the city. |
| A. | true |
| B. | false |
| Answer» C. | |
| 68. |
Which system of collection of sewageis called a dry system? |
| A. | conservancysystem |
| B. | biologicaldigestion |
| C. | incernation |
| D. | water carriagesystem |
| Answer» B. biologicaldigestion | |
| 69. |
Which of the following is the expression of the Manning’s formula? |
| A. | v = r1/3 s1/2/ n |
| B. | v = r2/3 s2/ n |
| C. | v = r2/3 s1/2/ n |
| D. | v = r2/3 s1/2 |
| Answer» D. v = r2/3 s1/2 | |
| 70. |
is a method where water is used as a medium for the flow of sewage from its production of the treatment unit. |
| A. | conservancy system |
| B. | biological digestion |
| C. | ) incernation |
| D. | water carriage system |
| Answer» E. | |
| 71. |
The organic loading in low rate trickling filter is 900 kg/hectare- meter/day. What is the efficiency ofthe filter? |
| A. | 0.431 |
| B. | 0.883 |
| C. | 0.0704 |
| D. | 0.83 |
| Answer» C. 0.0704 | |
| 72. |
provides only one sewer to carry both foul sewage and rainwater. |
| A. | separate water carriage system |
| B. | combined water carriage system |
| C. | partially combined water carriage system |
| D. | conservancy system |
| Answer» C. partially combined water carriage system | |
| 73. |
The sewer should be designed for a minimum of litres of waste water per capita per day. |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 1000 |
| Answer» D. 1000 | |
| 74. |
Which type of reactor is used for mixing chemicals in water treatment? |
| A. | continuous reactor |
| B. | batch reactor |
| C. | plug flow reactor |
| D. | fixed bed reactor |
| Answer» C. plug flow reactor | |
| 75. |
The spacing between the bars in racksis |
| A. | 30mm |
| B. | 50mm |
| C. | 70mm |
| D. | 90mm |
| Answer» C. 70mm | |
| 76. |
Which of the following is called as airdiffusion method? |
| A. | activated sludgeaeration |
| B. | diffused airaeration |
| C. | mechanicalaeration |
| D. | combinedaeration |
| Answer» C. mechanicalaeration | |
| 77. |
The reoxygenation constant at temperature ‘T’ is expressed by |
| A. | krt = kr20 (1.016)t |
| B. | krt = kr20 (1.047) t-20 |
| C. | krt = kr20 (1.016)t-20 |
| D. | krt = kr20 (1.047)t |
| Answer» D. krt = kr20 (1.047)t | |
| 78. |
In preliminary treatment of sewage, the operation which takes place, is |
| A. | removal of fine suspended particles |
| B. | removal of fine dissolved organic material |
| C. | removal of lighter floating material |
| D. | removal of harmful bacterias and otherorganisms |
| Answer» D. removal of harmful bacterias and otherorganisms | |
| 79. |
In which settling type, dilutesuspension of particles takes place? |
| A. | zone settling |
| B. | compressionsettling |
| C. | hinderedsettling |
| D. | discrete settling |
| Answer» D. discrete settling | |
| 80. |
Which of the following represents the oxygen sag curve in the following figure? |
| A. | dotted blue line |
| B. | green curve |
| C. | yellow curve |
| D. | red curve |
| Answer» E. | |
| 81. |
Which flow is also called as sanitarysewage? |
| A. | dry weather flow |
| B. | storm weatherflow |
| C. | uniform flow |
| D. | non uniformflow |
| Answer» B. storm weatherflow | |
| 82. |
Primary treatment of sewage consistsof removal of |
| A. | large suspendedorganic solids |
| B. | oil and grease |
| C. | sandand grit |
| D. | floating materials |
| Answer» B. oil and grease | |
| 83. |
The most widely used pumps forsewage lifting is |
| A. | centrifugal pummp |
| B. | reciprocating pump |
| C. | pneumaticejector |
| D. | air pressure pump |
| Answer» B. reciprocating pump | |
| 84. |
is the process in which ground water unfiltrate into the sewers. |
| A. | exfiltration |
| B. | infiltration |
| C. | filtration |
| D. | osmosis |
| Answer» C. filtration | |
| 85. |
is the process which indicates the flow of waste water from the sewer into the ground. |
| A. | exfiltration |
| B. | infiltration |
| C. | filtration |
| D. | osmosis |
| Answer» B. infiltration | |
| 86. |
The efficiency of a percolating filter isgiven by |
| A. | 100/(1+0.0044 (??)) |
| B. | 100/(1+0.044(??) 1/2) |
| C. | 100/(1+0.44(??) 1/2) |
| D. | 100/(1+0.0044(??) 1/2) |
| Answer» E. | |
| 87. |
In which stage of the SBR is aeration performed? |
| A. | first |
| B. | second |
| C. | third |
| D. | fourth |
| Answer» C. third | |
| 88. |
What is the maximum capacity ofmedium screen in collecting solids? |
| A. | 30l |
| B. | 40l |
| C. | 50l |
| D. | 90l |
| Answer» E. | |
| 89. |
Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» D. (ii) and (iv) | |
| 90. |
The amount of coagulant needed for coagulation of water increases with(i) Increase in turbidity of water(ii) Decrease in turbidity of water(iii) Increase in temperature of water(iv) Decrease in temperature of waterThe correct answer is |
| A. | (i) and (ii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (ii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 91. |
As compared to rapid sand filters, slow sand filters give(i) Slower filtration rate(ii) Higher filtration rate(iii) Lesser efficiency in removal of bacteria(iv) Higher efficiency in removal of bacteriaThe correct answer is |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» D. (ii) and (iv) | |
| 92. |
Which of the following retards the self purification of stream? |
| A. | Higher temperature |
| B. | Sunlight |
| C. | Satisfying oxygen demand |
| D. | None of the above |
| Answer» E. | |
| 93. |
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about |
| A. | 0.01 to 0.05 ppm |
| B. | 0.05 to 0.5 ppm |
| C. | 0.5 to 1.0 ppm |
| D. | 1.0 to 5.0 ppm |
| Answer» C. 0.5 to 1.0 ppm | |
| 94. |
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be |
| A. | 100 ppm |
| B. | 200 ppm |
| C. | 300 ppm |
| D. | 400 ppm |
| Answer» C. 300 ppm | |
| 95. |
The polluted water is one which |
| A. | Contains pathogenic bacteria |
| B. | Consists of undesirable substances rendering it unfit for drinking and domestic use |
| C. | Is safe and suitable for drinking and domestic use |
| D. | Is contaminated |
| Answer» C. Is safe and suitable for drinking and domestic use | |
| 96. |
Activated carbon is used for |
| A. | Disinfection |
| B. | Removing hardness |
| C. | Removing odours |
| D. | Removing corrosiveness |
| Answer» D. Removing corrosiveness | |
| 97. |
Generally the detention period for grit chambers is kept as |
| A. | 1 minute |
| B. | 5 minutes |
| C. | 24 hours |
| D. | 12 hours |
| Answer» B. 5 minutes | |
| 98. |
Sewage treatment units are normally designed for |
| A. | 5 - 10 years |
| B. | 15 - 20 years |
| C. | 30 - 40 years |
| D. | 40 - 50 years |
| Answer» C. 30 - 40 years | |
| 99. |
Sewerage system is usually designed for |
| A. | 10 years |
| B. | 25 years |
| C. | 50 years |
| D. | 75 years |
| Answer» C. 50 years | |
| 100. |
The biochemical treatment of sewage effluents is essentially a process of |
| A. | Oxidation |
| B. | Dehydration |
| C. | Reduction |
| D. | Alkalinization |
| Answer» B. Dehydration | |