R4RIN – MCQs, Mock Tests | Agricultural Engineering Agricultural Engineering MCQs Set-8

Which of the following factors doesn’t influence biological treatment efficiency?

1. Surface area
2. Void space
3. Drainage
4. High BOD

✅ Correct Answer: 4

Which of the following has the potential to ‘rough’ high strength industrial effluents prior to sewage discharge?

1. High rate bio filters
2. Conventional bio filters
3. Percolating filters
4. Rotating biological contractors

✅ Correct Answer: 1

Rotating biological contractors is used for carbonaceous oxidation as a ________

1. High rate bio filters
2. Conventional bio filters
3. Roughing filter
4. Filter cake

✅ Correct Answer: 3

Organic overloading is a major problem associated with Rotating biological contractors.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Absorbing oxygen from the air and pollutants from the wastewater can be decomposed aerobic microorganisms by which of the following methods?

1. High rate bio filters
2. Conventional bio filters
3. Percolating filter
4. Rotating biological contractors

✅ Correct Answer: 4

Up flow anaerobic sludge blanket reactor is an anaerobic digester which is used for wastewater treatment with the help of suspended sludge blanket filters.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Activated sludge is a type of wastewater treatment method for the treatment of sewage or industrial wastewaters using aeration and a microbial floc.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Which of the following is low energy consuming system for waste water treatment?

1. Biological wave contractor
2. Rotating biological contractors
3. High rate bio filters
4. Conventional bio filters

✅ Correct Answer: 1

___________ is a natural method of waste water treatment.

1. Chemical method
2. Physical method
3. Water hyacinth pond
4. Rotating biological contractors

✅ Correct Answer: 3

Which of the following method can be used to treat crude sewage and nitrify secondary effluent?

1. Duck weed ponds
2. Reed beds
3. Algal fish ponds
4. Water hyacinth pond

✅ Correct Answer: 2

Duck weed can grow profusely in nutrient rich waste water.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Which of the following methods can be used to convert organic pollutants into fish biomass?

1. Duck weed ponds
2. Reed beds
3. Algal fish ponds
4. Water hyacinth pond

✅ Correct Answer: 1

The bacterial biofilms and floating weeds interact in duckweed ponds resulting in decrease of nutrient load and _______ in waste water.

1. Organic pollutant
2. Fish biomass
3. Oxygen
4. Water

✅ Correct Answer: 1

The hollow rhizomes of the reeds generate a hydraulic pathway thereby treating sewage by ___________

1. Flocculation
2. Bacterial activity
3. Precipitation
4. Sedimentation

✅ Correct Answer: 2

Which of the following factors doesn’t need to be considered in order to make the system of nutrient removal cost effective?

1. Waste water type
2. Space
3. Production rate
4. Water volume

✅ Correct Answer: 4

__________ method can be used for enhancing the performance of waste stabilization ponds.

1. Water hyacinth pond
2. Reed beds
3. Duck weed ponds
4. Algal fish ponds

✅ Correct Answer: 1

Algal fish ponds require artificial aeration.

1. True
2. False
3.
4.

✅ Correct Answer: 2

What is the method of treatment used when the TSS in the sample is high?

1. Ultrafiltration
2. High rate solid contact clarifier
3. Pressure Sand filter
4. Activated Carbon filter

✅ Correct Answer: 2

Which type of treatment does clarification fall in?

1. Secondary treatment
2. Primary treatment
3. Preliminary treatment
4. Tertiary treatment

✅ Correct Answer: 2

Which of these remove coarse materials?

1. Coarse screen
2. Grit chamber
3. Fine screen
4. Commutors

✅ Correct Answer: 1

Which type of treatment is the coarse screen?

1. Preliminary treatment
2. Primary treatment
3. Secondary treatment
4. Tertiary treatment

✅ Correct Answer: 1

Tube settlers are classified as which type of treatment?

1. Tertiary treatment
2. Secondary treatment
3. Preliminary treatment
4. Primary treatment

✅ Correct Answer: 2

Activated Carbon is classified as which type of treatment?

1. Preliminary treatment
2. Primary treatment
3. Secondary treatment
4. Tertiary treatment

✅ Correct Answer: 4

Which of these is used to remove odour?

1. Ultrafiltration
2. Pressure sand filter
3. Activated carbon
4. Nano filter

✅ Correct Answer: 3

Reverse Osmosis is which type of treatment?

1. Primary treatment
2. Preliminary treatment
3. Secondary treatment
4. Tertiary treatment

✅ Correct Answer: 4

Which is usually prior to reverse osmosis?

1. Ultrafiltration
2. Activated carbon filter
3. Clarifier
4. Tube settler

✅ Correct Answer: 1

What does zero discharge actually refer to?

1. There is zero discharge of ions
2. The reject is recycled from every part of the treatment plant
3. The reject is not rejected out. Influent equals effluent
4. 100 percent efficient plant

✅ Correct Answer: 2

What is the size of the small rapid sand filter bed?

1. 50 sqm
2. 80 sqm
3. 100 sqm
4. 120 sqm

✅ Correct Answer: 3

Pre-treatment of beds is not necessary.

1. True
2. False
3.
4.

✅ Correct Answer: 2

What is the percentage of bacterial removal in filter beds?

1. 60-70 %
2. 75-80 %
3. 80-90 %
4. 90-99 %

✅ Correct Answer: 4

What is the effective size of sand used in rapid sand filters?

1. 0.2-0.3 mm
2. 0.3-0.6 mm
3. 0.6-1.2 mm
4. 12-2.4 mm

✅ Correct Answer: 3

What is the head loss found in a rapid sand filter?

1. <3
2. >3
3. 0
4. <4

✅ Correct Answer: 2

What is the surface wash rate?

1. 5-6 cum/sqm h
2. 6-7 cum/sqm h
3. 8-10 cum/sqm h
4. 10-12 cum/sqm h

✅ Correct Answer: 4

What is the porosity range during expansion of the filter bed?

1. 0.4-0.5
2. 0.5-0.6
3. 0.1-0.2
4. 0.68-0.7

✅ Correct Answer: 4

Even by high-rate of backwash, efficiency of cleaning is poor.

1. True
2. False
3.
4.

✅ Correct Answer: 1

What is the air scour rate which is provided before a water backwash?

1. 12 cum/ sqm h
2. 15 cum/ sqm h
3. 20 cum/ sqm h
4. 27 cum/ sqm h

✅ Correct Answer: 4

What is the depth of washing during high-rate water backwash?

1. 3-4 mm
2. 3-6 mm
3. 2-3 mm
4. 1-2 mm

✅ Correct Answer: 2

What does sand filter remove?

1. TDS
2. TSS
3. BOD
4. COD

✅ Correct Answer: 2

What is the TSS at the outlet of the Pressure Sand Filter (PSF)?

1. <10 ppm
2. 25 ppm
3. 100 ppm
4. >150 ppm

✅ Correct Answer: 1

While designing a sand filter what is the velocity that is assumed?

1. 10-12 m/h
2. 15 m/h
3. 20 m/h
4. 30 m/h

✅ Correct Answer: 1

While designing a dual media filter what is the velocity that is assumed?

1. 10-12 m/h
2. 15-18 m/h
3. 20 m/h
4. 30 m/h

✅ Correct Answer: 2

While designing a multimedia filter what is the velocity that is assumed?

1. 10-12 m/h
2. 15-18 m/h
3. 18-20 m/h
4. 30 m/h

✅ Correct Answer: 3

In which of the following filters, the rate of filtration is highest?

1. Slow sand filter
2. Rapid sand filter
3. Pressure filter
4. Roughing filter

✅ Correct Answer: 3

The final loss of head in slow sand filter is ______ than rapid sand filter.

1. Higher
2. Lower
3. Slightly Lower
4. Equivalent

✅ Correct Answer: 2

The turbidity of water applied to rapid sand filter is less than _______

1. 35-40ppm
2. 10-20ppm
3. 30-40ppm
4. 10-15ppm

✅ Correct Answer: 1

The period of cleaning of a slow sand filter is ______ than rapid sand filter.

1. Smaller
2. Larger
3. Slightly smaller
4. Slightly larger

✅ Correct Answer: 2

The bacterial removal efficiency of the rapid sand filter is ______ in comparison to slow sand filter.

1. More
2. Less
3. Equal
4. Better

✅ Correct Answer: 2

How is the grain size distribution of sand in rapid sand filter?

1. Stratified
2. Unlayered
3. Layered with heaviest grains at the top
4. Layered with lightest grains at the top

✅ Correct Answer: 4

Consider the following statement. i. The penetration of suspended matter is deep in the slow sand filter ii. The penetration of suspended matter is superficial in the rapid sand filter iii. Coagulation is not required in the slow sand filter Which of the above statement is/are correct?

1. Only iii
2. i, ii
3. i, ii, iii
4. ii, iii

✅ Correct Answer: 1

The filter run in rapid sand filter should not be less than _____ hours.

1. 1
2. 6
3. 12
4. 24

✅ Correct Answer: 4