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Objective Questions

Latest RCFL Operator Trainee Exam Question (Objective Questions), MCQ in English

Subjects : Concerned Subject (Chemical), General English, Quantitative Aptitude, Reasoning & General Knowledge

Question Bank RCFL Operator Trainee Exam - English
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Concerned Subject (Chemical)

Question 1Single Answer
What type of controller uses proportional, integral, and derivative terms?
  1. A
    On/Off controller
  2. B
    Proportional controller
  3. C
    PID controller
  4. D
    Feedforward controller
Question 2Single Answer
What is the term for a control loop where the output is measured and fed back to the controller?
  1. A
    Feedforward control
  2. B
    Feedback control
  3. C
    Open-loop control
  4. D
    Cascade control
Question 3Single Answer
What is the term for a control loop where disturbances are measured and used to adjust the manipulated variable?
  1. A
    Feedback control
  2. B
    Feedforward control
  3. C
    Open-loop control
  4. D
    Ratio control
Question 4Single Answer
Which device is commonly used to control fluid flow in a process?
  1. A
    Temperature sensor
  2. B
    Pressure transmitter
  3. C
    Control valve
  4. D
    Level indicator
Question 5Single Answer
What is the term for the difference between the desired setpoint and the measured process variable?
  1. A
    Gain
  2. B
    Offset
  3. C
    Error
  4. D
    Lag
Question 6Single Answer
What is the term for the cost of raw materials and energy used in a process?
  1. A
    Fixed cost
  2. B
    Variable cost
  3. C
    Capital cost
  4. D
    Operating cost
Question 7Single Answer
What is the term for the cost of equipment and infrastructure in a process?
  1. A
    Variable cost
  2. B
    Fixed cost
  3. C
    Operating cost
  4. D
    Material cost
Question 8Single Answer
What is the term for the ratio of output to input in a process?
  1. A
    Profit
  2. B
    Yield
  3. C
    Efficiency
  4. D
    Conversion
Question 9Single Answer
What is the term for the percentage of reactants converted into products?
  1. A
    Yield
  2. B
    Efficiency
  3. C
    Profit
  4. D
    Cost
Question 10Single Answer
What is the term for the amount of desired product obtained from a given amount of reactants?
  1. A
    Conversion
  2. B
    Efficiency
  3. C
    Yield
  4. D
    Cost
Question 11Single Answer
What is the term for the economic evaluation of a project's profitability?
  1. A
    Material balance
  2. B
    Energy balance
  3. C
    Feasibility study
  4. D
    Process control
Question 12Single Answer
What type of bacteria is used in aerobic wastewater treatment?
  1. A
    Anaerobic bacteria
  2. B
    Aerobic bacteria
  3. C
    Photosynthetic bacteria
  4. D
    Chemosynthetic bacteria
Question 13Single Answer
What type of bacteria is used in anaerobic sludge digestion?
  1. A
    Aerobic bacteria
  2. B
    Anaerobic bacteria
  3. C
    Nitrifying bacteria
  4. D
    Denitrifying bacteria
Question 14Single Answer
What is the term for the oxygen required by microorganisms to decompose organic matter in wastewater?
  1. A
    COD (Chemical Oxygen Demand)
  2. B
    BOD (Biochemical Oxygen Demand)
  3. C
    DO (Dissolved Oxygen)
  4. D
    TOC (Total Organic Carbon)
Question 15Single Answer
What is the function of nitrifying bacteria in wastewater treatment?
  1. A
    To remove organic matter
  2. B
    To convert ammonia to nitrates
  3. C
    To remove heavy metals
  4. D
    To produce methane
Question 16Single Answer
What is the function of denitrifying bacteria in wastewater treatment?
  1. A
    To remove organic matter
  2. B
    To convert nitrates to nitrogen gas
  3. C
    To remove heavy metals
  4. D
    To produce methane
Question 17Single Answer
What is the term for the heat required to vaporize a liquid?
  1. A
    Sensible heat
  2. B
    Latent heat
  3. C
    Specific heat
  4. D
    Heat of reaction
Question 18Single Answer
What is the term for the heat required to change the temperature of a substance without a phase change?
  1. A
    Latent heat
  2. B
    Sensible heat
  3. C
    Heat of formation
  4. D
    Heat of combustion
Question 19Single Answer
What is the term for the heat released or absorbed during a chemical reaction?
  1. A
    Latent heat
  2. B
    Sensible heat
  3. C
    Specific heat
  4. D
    Heat of reaction
Question 20Single Answer
What is the term for a system where there is no transfer of mass or energy across its boundaries?
  1. A
    Open system
  2. B
    Closed system
  3. C
    Isolated system
  4. D
    Adiabatic system
Question 21Single Answer
What is the term for a system where there is a transfer of mass and energy across its boundaries?
  1. A
    Isolated system
  2. B
    Closed system
  3. C
    Open system
  4. D
    Adiabatic system
Question 22Single Answer
What is the term for the ratio of the rate of formation of the desired product to the rate of formation of undesired products?
  1. A
    Conversion
  2. B
    Yield
  3. C
    Selectivity
  4. D
    Efficiency
Question 23Single Answer
What is the term for the temperature dependence of the rate constant?
  1. A
    Van't Hoff equation
  2. B
    Arrhenius equation
  3. C
    Rate law
  4. D
    Equilibrium constant
Question 24Single Answer
What is the term for the equilibrium constant in terms of partial pressures of gases?
  1. A
    Kc
  2. B
    Kp
  3. C
    Kx
  4. D
    Ky
Question 25Single Answer
What type of reaction has a rate law that corresponds to the stoichiometry of the reaction?
  1. A
    Non-elementary reaction
  2. B
    Elementary reaction
  3. C
    Reversible reaction
  4. D
    Irreversible reaction
Question 26Single Answer
What type of reaction has a rate law that does not correspond to the stoichiometry of the reaction?
  1. A
    Elementary reaction
  2. B
    Non-elementary reaction
  3. C
    Reversible reaction
  4. D
    Irreversible reaction
Question 27Single Answer
What is the term for the range of values a sensor can measure?
  1. A
    Accuracy
  2. B
    Precision
  3. C
    Span
  4. D
    Resolution
Question 28Single Answer
What is the term for the closeness of a measurement to the true value?
  1. A
    Precision
  2. B
    Accuracy
  3. C
    Span
  4. D
    Resolution
Question 29Single Answer
What is the term for the repeatability of a measurement?
  1. A
    Accuracy
  2. B
    Precision
  3. C
    Span
  4. D
    Resolution
Question 30Single Answer
What type of sensor is used to measure temperature?
  1. A
    Pressure transmitter
  2. B
    Level indicator
  3. C
    Thermocouple
  4. D
    Flow meter
Question 31Single Answer
What type of sensor is used to measure pressure?
  1. A
    Thermocouple
  2. B
    Flow meter
  3. C
    Pressure transmitter
  4. D
    Level indicator
Question 32Single Answer
What type of sensor is used to measure fluid flow rate?
  1. A
    Pressure transmitter
  2. B
    Level indicator
  3. C
    Thermocouple
  4. D
    Flow meter
Question 33Single Answer
What type of sensor is used to measure the height of a liquid in a tank?
  1. A
    Pressure transmitter
  2. B
    Level indicator
  3. C
    Thermocouple
  4. D
    Flow meter
Question 34Single Answer
What is the term for the time it takes for an investment to pay for itself?
  1. A
    Net present value (NPV)
  2. B
    Internal rate of return (IRR)
  3. C
    Payback period
  4. D
    Return on investment (ROI)
Question 35Single Answer
What is the term for the present value of future cash flows minus the initial investment?
  1. A
    Payback period
  2. B
    Return on investment (ROI)
  3. C
    Net present value (NPV)
  4. D
    Internal rate of return (IRR)
Question 36Single Answer
What is the term for the discount rate that makes the net present value of a project equal to zero?
  1. A
    Payback period
  2. B
    Return on investment (ROI)
  3. C
    Net present value (NPV)
  4. D
    Internal rate of return (IRR)
Question 37Single Answer
What is the term for the ratio of profit to the initial investment?
  1. A
    Payback period
  2. B
    Return on investment (ROI)
  3. C
    Net present value (NPV)
  4. D
    Internal rate of return (IRR)
Question 38Single Answer
What is the term for the cost of borrowing money or the return on invested capital?
  1. A
    Depreciation
  2. B
    Interest rate
  3. C
    Inflation
  4. D
    Amortization
Question 39Single Answer
What is the term for the general increase in prices over time?
  1. A
    Deflation
  2. B
    Inflation
  3. C
    Appreciation
  4. D
    Amortization
Question 40Single Answer
What is the term for the decrease in the general price level of goods and services over time?
  1. A
    Inflation
  2. B
    Deflation
  3. C
    Appreciation
  4. D
    Amortization
Question 41Single Answer
Which of the following describes a vapor-liquid equilibrium (VLE)?
  1. A
    Equilibrium between two solid phases
  2. B
    Equilibrium between a liquid and a vapor phase
  3. C
    Equilibrium between two liquid phases
  4. D
    Equilibrium between a solid and a liquid phase
Question 42Single Answer
The Fick's first law of diffusion states that the molar flux is proportional to:
  1. A
    Temperature gradient
  2. B
    Pressure gradient
  3. C
    Concentration gradient
  4. D
    Velocity gradient
Question 43Single Answer
The equilibrium stage in a separation process is also known as:
  1. A
    Theoretical plate
  2. B
    Operating stage
  3. C
    Actual plate
  4. D
    Feed stage
Question 44Single Answer
Mass transfer coefficient is a measure of:
  1. A
    The rate of mass transfer
  2. B
    The equilibrium concentration
  3. C
    The feed flow rate
  4. D
    The operating pressure
Question 45Single Answer
Liquid-liquid equilibrium (LLE) involves:
  1. A
    Two immiscible liquid phases
  2. B
    A liquid and a vapor phase
  3. C
    A solid and a liquid phase
  4. D
    Two miscible liquid phases
Question 46Single Answer
In batch distillation, the composition of the distillate:
  1. A
    Remains constant
  2. B
    Changes with time
  3. C
    Is equal to the feed composition
  4. D
    Is independent of the feed
Question 47Single Answer
The McCabe-Thiele method is used to determine:
  1. A
    The minimum reflux ratio
  2. B
    The number of theoretical trays
  3. C
    The operating pressure
  4. D
    The feed composition
Question 48Single Answer
Sieve trays are characterized by:
  1. A
    Caps and risers
  2. B
    Perforated plates
  3. C
    Packing materials
  4. D
    Rotating blades
Question 49Single Answer
Azeotropes are mixtures that:
  1. A
    Can be easily separated by distillation
  2. B
    Boil at a constant temperature and composition
  3. C
    Have a high relative volatility
  4. D
    Are always ideal mixtures
Question 50Single Answer
Steam distillation is used for separating:
  1. A
    High-boiling temperature components
  2. B
    Low-boiling temperature components
  3. C
    Azeotropic mixtures
  4. D
    Ideal mixtures
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