R4RIN – MCQs, Mock Tests | Agricultural Engineering Agricultural Engineering MCQs Set-7

The residues produced from evaporation treatment is _________

1. Less
2. More
3. Undetermined
4. No residue

✅ Correct Answer: 1

Evaporation of liquids from hazardous waste through multiple evaporator, distillation etc. is dependent on ________

1. Melting point
2. Freezing point
3. Boiling point
4. Vapour pressure

✅ Correct Answer: 3

Steel tubes used in multiple effect evaporator are placed on surface.

1. True
2. False
3.
4.

✅ Correct Answer: 2

Evaporator must have sufficient disc engaging space to achieve ________

1. Separation
2. Chemicals
3. Boiling
4. Pressure

✅ Correct Answer: 1

Which of the following waste is not applicable for evaporation?

1. Calcium
2. Iron
3. Copper
4. Methylene chloride

✅ Correct Answer: 4

_________ wastes can be treated in evaporator.

1. Aqueous inorganic
2. Organic
3. Aqueous organic
4. Dry

✅ Correct Answer: 1

Evaporation units may be operated without obtaining a permit if ________

1. Chemicals are used
2. Resins are associated
3. Unit is enclosed
4. Waste is reused

✅ Correct Answer: 3

Thermal treatment technologies are differentiated by ___________

1. Type of grate
2. Chemicals
3. Energy
4. Temperature

✅ Correct Answer: 1

__________ from combustion of waste reduces cost.

1. Chemical analysis
2. Metals
3. Material recovery
4. LCA

✅ Correct Answer: 3

________ emission is cited as an issue from incineration?

1. Carbon
2. Dioxin
3. Sulphur
4. Nitrogen

✅ Correct Answer: 2

Thermal processing reduces hazard from waste.

1. True
2. False
3.
4.

✅ Correct Answer: 1

________ % of waste by weight remains after combustion.

1. 20-35
2. 20-40
3. 40-50
4. 30-50

✅ Correct Answer: 1

Ferrous materials are combustible.

1. True
2. False
3.
4.

✅ Correct Answer: 2

Residence time of waste in combustion zone is ________ seconds.

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 2

________ of hazardous waste plays a major role in designing combustion unit.

1. Calorific value
2. Chemical value
3. Energy value
4. Fuel value

✅ Correct Answer: 1

Which of the following waste characteristic is considered for combustion?

1. Flash point
2. Energy point
3. Burning point
4. Melting point

✅ Correct Answer: 1

Mechanical mixing of waste ensures ________

1. Flash point
2. Even distribution
3. Hydrocarbon mixing
4. Less water requirement

✅ Correct Answer: 2

Which of the following are the solid residues from incineration?

1. Slag, fly ash, APC
2. Klink, ash, BPC
3. Gas, slag, APC
4. Liquids, ash, slag

✅ Correct Answer: 1

What is the emission limit for dioxins as per European Union?

1. 0.1
2. 0.2
3. 0.3
4. 0.4

✅ Correct Answer: 1

Chemical precipitation makes the hazardous waste _________

1. Soluble
2. Insoluble
3. Volatile
4. Acidic

✅ Correct Answer: 2

Precipitation by ___________ is widely used method for treating hazardous waste.

1. Calcium hydroxide
2. Sodium hydroxide
3. Potassium hydroxide
4. Lead oxide

✅ Correct Answer: 1

Chemical precipitation is used in conjunction with neutralisation.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Chemical precipitation treatment is effective in wastewater containing _______

1. Chemicals
2. Chloride
3. Toxic metals
4. Impurities

✅ Correct Answer: 3

_______ treatment is suitable for metal salts bearing wastes.

1. Neutralisation
2. Chemical precipitation
3. Hydrolysis
4. Solvent extraction

✅ Correct Answer: 2

_______ is used for precipitation of heavy metals.

1. Calcium hydroxide
2. Lime
3. Potassium hydroxide
4. Lead oxide

✅ Correct Answer: 2

Chemical precipitation treatment is user economic.

1. True
2. False
3.
4.

✅ Correct Answer: 2

The environmental issue caused by chemical precipitation is _________

1. Chemical silt
2. Salts
3. Liquid matter
4. Degradation

✅ Correct Answer: 1

Ion exchange is widely used to remove _________

1. Heavy metals
2. Toxic heavy metals
3. Minerals
4. Salts

✅ Correct Answer: 2

Ion exchange is an irreversible process.

1. True
2. False
3.
4.

✅ Correct Answer: 2

Resins can remove specific substances in a waste solution.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Which of the following is possible from ion exchange treatment?

1. Metal recovery
2. Oxidation reduction
3. Waste analysis
4. Chemical analysis

✅ Correct Answer: 1

Most suitable treatment method for electroplating discharge is ____________

1. Reduction process
2. Ion exchange
3. Waste analysis
4. Chemical analysis

✅ Correct Answer: 2

Which of the following resin can be used to remove copper plating rinse water?

1. ResinTech’s CG-8 (Na)
2. ResinTech’s CG-8 (K)
3. ResinTech’s CP-8 (Na)
4. ResinTech’s PG-8 (Na)

✅ Correct Answer: 1

Organic gas from condensation can be used as fuel.

1. True
2. False
3.
4.

✅ Correct Answer: 1

Which of the following is the end product of anaerobic degradation?

1. Liquor
2. Nitrogen
3. Lead
4. Sulphur

✅ Correct Answer: 1

The gases produced from anaerobic degradation process are ________ and ________

1. Nitrogen, sulphur
2. Acetate, nitrate
3. Carbon, methane
4. Methane, sulphur

✅ Correct Answer: 3

Non-methanogenic and methane-producing organisms effect anaerobic treatment.

1. True
2. False
3.
4.

✅ Correct Answer: 1

The temperature range for anaerobic process is ________ and ______ degree Celsius.

1. 10-20, 20-30
2. 32-37, 40-55
3. 10-40, 40-55
4. 10-50, 20-47

✅ Correct Answer: 2

Which of the following gas is toxic to methanogenic bacteria?

1. Carbon
2. Sulphur
3. Nitrogen
4. Oxygen

✅ Correct Answer: 4

Soluble ions of heavy metals are toxic above _______ ppm in industrial waste.

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 2

Sodium and potassium ions cause strong inhibition above ________ ppm.

1. 10
2. 100
3. 1000
4. 10000

✅ Correct Answer: 4

Anaerobic digestion is generally applied to BOD wastes above ________ ppm.

1. 3000
2. 6000
3. 9000
4. 12000

✅ Correct Answer: 2

Anaerobic treatment is mediated through _______

1. Enzyme catalysis
2. Enzyme
3. Chemical
4. Sulphur

✅ Correct Answer: 1

The treatability of the hazardous waste depends upon ________ content.

1. Carbon
2. Hydrocarbon
3. Nitrate
4. Sulphur

✅ Correct Answer: 2

Which of the following parameters effect operating conditions of anaerobic treatment process?

1. Influent quality
2. Chemicals
3. Hydrocarbon
4. Sulphur

✅ Correct Answer: 1

Which of the following is another name given to conventional bio filters?

1. Percolating filter
2. Filter cake
3. Injection recovery
4. Bio-luminescence

✅ Correct Answer: 1

In the exposed lands, ______ are used to assist rotation during harsh weather conditions?

1. Wind vanes
2. Water sprayer
3. Flow bed
4. Motor drives

✅ Correct Answer: 1

Bio filters are fed with effluent only after ____________

1. Initial settlement
2. Bio-accumulation
3. Bio-degradation
4. Bio-magnification

✅ Correct Answer: 1

Compensation for lower temperatures can be achieved by reducing hydraulic and organic loading rates thereby increasing _____________

1. Retention time
2. Mixing
3. Aeration
4. Sparging

✅ Correct Answer: 1

Effective preliminary treatment can also be used to remove the ____

1. Girt and rag
2. Carbon dioxide
3. Nutrients
4. Oxygen

✅ Correct Answer: 1