Download AppGovt. JobsFree G.K. & Current AffairsScholarshipBlog
Free PracticeContact
📚 Exam by Category
▾
Objective Questions

Latest IOCL Engineer Exam Question (Objective Questions), MCQ in English

Subjects : Chemical, Quantitative Aptitude, Logical Reasoning, Verbal Ability of English Language

Question Bank IOCL Engineer/Officer (Grade A) (Chemical) Exam - English
Back to Exam

Chemical

Question 1Single Answer
The equilibrium constant (K) for a reaction is related to the Gibbs free energy change (ΔG) by:
  1. A
    ΔG = -RT ln(K)
  2. B
    ΔG = RT ln(K)
  3. C
    ΔG = -RT/ln(K)
  4. D
    ΔG = RT/ln(K)
Question 2Single Answer
The first law of thermodynamics states that:
  1. A
    Entropy of an isolated system always increases
  2. B
    Energy can neither be created nor destroyed
  3. C
    Enthalpy remains constant in an adiabatic process
  4. D
    Heat transfer is irreversible
Question 3Single Answer
Which thermodynamic property is a measure of the disorder of a system?
  1. A
    Enthalpy
  2. B
    Gibbs free energy
  3. C
    Entropy
  4. D
    Internal energy
Question 4Single Answer
The Gibbs phase rule is used to determine:
  1. A
    The rate of a chemical reaction
  2. B
    The number of degrees of freedom in a system
  3. C
    The heat transfer coefficient
  4. D
    The mass transfer rate
Question 5Single Answer
What is the term for a system in which there is no transfer of heat with the surroundings?
  1. A
    Isothermal
  2. B
    Isobaric
  3. C
    Adiabatic
  4. D
    Isochoric
Question 6Single Answer
The Clapeyron equation is used to calculate:
  1. A
    Vapor pressure as a function of temperature
  2. B
    Heat capacity
  3. C
    Reaction rate
  4. D
    Mass transfer coefficient
Question 7Single Answer
Fugacity is a measure of:
  1. A
    The ideal gas pressure
  2. B
    The "escaping tendency" of a substance from a phase
  3. C
    The reaction rate
  4. D
    The heat transfer rate
Question 8Single Answer
The rate of a homogeneous reaction is usually expressed as a function of:
  1. A
    Temperature and pressure only
  2. B
    Temperature and concentration
  3. C
    Pressure and flow rate
  4. D
    Flow rate and volume
Question 9Single Answer
A batch reactor is characterized by:
  1. A
    Continuous flow of reactants and products
  2. B
    No flow of reactants or products during the reaction
  3. C
    Constant volume and temperature
  4. D
    Constant pressure and temperature
Question 10Single Answer
A continuous stirred-tank reactor (CSTR) is assumed to be:
  1. A
    Plug flow
  2. B
    Perfectly mixed
  3. C
    Laminar flow
  4. D
    Turbulent flow
Question 11Single Answer
The space time in a plug flow reactor (PFR) is equal to:
  1. A
    The residence time
  2. B
    The reaction rate
  3. C
    The heat transfer rate
  4. D
    The mass transfer rate
Question 12Single Answer
Catalysts increase the rate of a reaction by:
  1. A
    Increasing the temperature
  2. B
    Lowering the activation energy
  3. C
    Increasing the pressure
  4. D
    Changing the equilibrium constant
Question 13Single Answer
What type of reactor is used for heterogeneous catalytic reactions where a solid catalyst is fluidized by the reacting fluid?
  1. A
    Batch reactor
  2. B
    CSTR
  3. C
    Fluidized bed reactor
  4. D
    Packed bed reactor
Question 14Single Answer
The Arrhenius equation describes the temperature dependence of:
  1. A
    Reaction rate constant
  2. B
    Heat transfer coefficient
  3. C
    Mass transfer coefficient
  4. D
    Equilibrium constant
Question 15Single Answer
Distillation is used to separate components based on differences in:
  1. A
    Density
  2. B
    Boiling points
  3. C
    Viscosity
  4. D
    Particle size
Question 16Single Answer
Absorption is a mass transfer operation in which a gas is dissolved in a:
  1. A
    Solid
  2. B
    Liquid
  3. C
    Another gas
  4. D
    Vacuum
Question 17Single Answer
Extraction is a separation process based on differences in:
  1. A
    Solubility
  2. B
    Density
  3. C
    Boiling point
  4. D
    Viscosity
Question 18Single Answer
Drying involves the removal of:
  1. A
    Solutes from a solution
  2. B
    Moisture from a solid
  3. C
    Gases from a mixture
  4. D
    Heat from a system
Question 19Single Answer
Reverse osmosis is an example of a:
  1. A
    Distillation process
  2. B
    Absorption process
  3. C
    Membrane separation process
  4. D
    Drying process
Question 20Single Answer
The Fick's law describes:
  1. A
    Heat conduction
  2. B
    Mass diffusion
  3. C
    Fluid flow
  4. D
    Chemical reaction rates
Question 21Single Answer
The overall mass transfer coefficient is influenced by:
  1. A
    Liquid-phase resistance only
  2. B
    Gas-phase resistance only
  3. C
    Both liquid-phase and gas-phase resistances
  4. D
    Neither liquid nor gas phase resistances
Question 22Single Answer
Conduction is the transfer of heat through:
  1. A
    Fluid motion
  2. B
    Electromagnetic waves
  3. C
    Molecular vibrations
  4. D
    Phase change
Question 23Single Answer
Convection involves heat transfer by:
  1. A
    Electromagnetic waves
  2. B
    Fluid motion
  3. C
    Molecular vibrations
  4. D
    Phase change
Question 24Single Answer
Radiation is heat transfer by:
  1. A
    Fluid motion
  2. B
    Electromagnetic waves
  3. C
    Molecular vibrations
  4. D
    Phase change
Question 25Single Answer
A heat exchanger is used to:
  1. A
    Increase reaction rate
  2. B
    Transfer heat between two fluids
  3. C
    Separate components
  4. D
    Dry solids
Question 26Single Answer
What is the term for heat transfer in a fluid due to bulk movement of the fluid?
  1. A
    Conduction
  2. B
    Convection
  3. C
    Radiation
  4. D
    Evaporation
Question 27Single Answer
The Fourier's law describes:
  1. A
    Heat conduction
  2. B
    Mass diffusion
  3. C
    Fluid flow
  4. D
    Chemical reaction rates
Question 28Single Answer
The Stefan-Boltzmann law describes:
  1. A
    Heat conduction
  2. B
    Heat radiation
  3. C
    Heat convection
  4. D
    Heat transfer in heat exchangers
Question 29Single Answer
The Nusselt number is a dimensionless number used in:
  1. A
    Mass transfer
  2. B
    Heat transfer
  3. C
    Reaction kinetics
  4. D
    Thermodynamics
Question 30Single Answer
What type of heat exchanger consists of concentric pipes?
  1. A
    Shell and tube
  2. B
    Double pipe
  3. C
    Plate
  4. D
    Finned tube
Question 31Single Answer
The overall heat transfer coefficient in a heat exchanger is affected by:
  1. A
    Fluid velocities and thermal conductivities
  2. B
    Only fluid velocities
  3. C
    Only thermal conductivities
  4. D
    Neither fluid velocities nor thermal conductivities
Question 32Single Answer
In a counter-current heat exchanger, the fluids flow:
  1. A
    In the same direction
  2. B
    In opposite directions
  3. C
    Perpendicular to each other
  4. D
    In a circular pattern
Question 33Single Answer
The logarithmic mean temperature difference (LMTD) is used to calculate:
  1. A
    Heat transfer rate
  2. B
    Mass transfer rate
  3. C
    Reaction rate
  4. D
    Fluid flow rate
Question 34Single Answer
The Prandtl number is a dimensionless number that relates:
  1. A
    Momentum diffusivity and thermal diffusivity
  2. B
    Mass diffusivity and thermal diffusivity
  3. C
    Momentum diffusivity and mass diffusivity
  4. D
    Fluid velocity and pressure
Question 35Single Answer
Fins are used in heat exchangers to:
  1. A
    Increase the heat transfer surface area
  2. B
    Decrease the fluid velocity
  3. C
    Increase the pressure drop
  4. D
    Decrease the thermal conductivity
Question 36Single Answer
Forced convection occurs when fluid motion is caused by:
  1. A
    Density differences
  2. B
    External means like pumps or fans
  3. C
    Molecular vibrations
  4. D
    Electromagnetic waves
Question 37Single Answer
Natural convection occurs when fluid motion is caused by:
  1. A
    External means like pumps or fans
  2. B
    Density differences
  3. C
    Molecular vibrations
  4. D
    Electromagnetic waves
Question 38Single Answer
The effectiveness of a heat exchanger is defined as:
  1. A
    The ratio of actual heat transfer to maximum possible heat transfer
  2. B
    The ratio of fluid velocities
  3. C
    The ratio of thermal conductivities
  4. D
    The ratio of pressure drops
Question 39Single Answer
Scaling in heat exchangers refers to:
  1. A
    The formation of deposits on heat transfer surfaces
  2. B
    The increase in heat transfer rate
  3. C
    The decrease in fluid velocity
  4. D
    The increase in pressure drop
Question 40Single Answer
Pascal's law states that pressure applied to an enclosed fluid is:
  1. A
    Diminished throughout the fluid
  2. B
    Transmitted undiminished to every point in the fluid
  3. C
    Increased in the direction of flow
  4. D
    Decreased in the direction of flow
Question 41Single Answer
The Reynolds number is used to determine:
  1. A
    Fluid density
  2. B
    Flow regime (laminar or turbulent)
  3. C
    Fluid viscosity
  4. D
    Fluid pressure
Question 42Single Answer
A centrifugal pump operates based on:
  1. A
    Positive displacement
  2. B
    Centrifugal force
  3. C
    Gravity
  4. D
    Vacuum
Question 43Single Answer
Size reduction of solids is accomplished by:
  1. A
    Filtration
  2. B
    Crushing and grinding
  3. C
    Sedimentation
  4. D
    Distillation
Question 44Single Answer
Filtration is a process used to separate:
  1. A
    Liquids from gases
  2. B
    Solids from liquids
  3. C
    Gases from gases
  4. D
    Solids from solids
Question 45Single Answer
Sedimentation is a process based on:
  1. A
    Density differences
  2. B
    Boiling point differences
  3. C
    Solubility differences
  4. D
    Viscosity differences
Question 46Single Answer
If (A=\begin{bmatrix}2&1\4&2\end{bmatrix}), what is the rank of matrix (A)?
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3
Question 47Single Answer
What is the determinant of the matrix (\begin{bmatrix}3&5\2&7\end{bmatrix})?
  1. A
    19
  2. B
    21
  3. C
    17
  4. D
    11
Question 48Single Answer
A square matrix is invertible if and only if?
  1. A
    Its determinant is zero
  2. B
    Its trace is zero
  3. C
    It is symmetric
  4. D
    Its determinant is non-zero
Question 49Single Answer
The eigenvalues of the identity matrix of order 4 are?
  1. A
    0, 0, 0, 0
  2. B
    1, 1, 1, 1
  3. C
    4, 4, 4, 4
  4. D
    −1, −1, −1, −1
Question 50Single Answer
If the trace of a 3×3 matrix is 12 and two eigenvalues are 2 and 5, what is the third eigenvalue?
  1. A
    3
  2. B
    4
  3. C
    7
  4. D
    5
Important Questions Package

IOCL Engineer Exam Online Question Bank Package

Buy IOCL Engineer Important Questions, MCQ, question answer in Hindi & English. It will help you to score high marks in IOCL Engineer question bank 2026 in Online, PDF & Print study material.

+ Free Monthly Current Affairs, GK & more PDF Download
Sr.Package NameAmount
1.IOCL Engineer/Officer (Grade A) Electrical Exam - Hindi
Description : 1000 Question with Answer.
₹101 [₹500]
2.IOCL Engineer/Officer (Grade A) Electrical Exam - Hindi
Description : 2000 Question with Answer.
₹151 [₹500]
3.IOCL Engineer/Officer (Grade A) Electrical Exam - Hindi
Description : 3000 Question with Answer.
₹181 [₹500]
4.IOCL Engineer/Officer (Grade A) Electrical Exam - English
Description : 1000 Question with Answer.
₹101 [₹500]
5.IOCL Engineer/Officer (Grade A) Electrical Exam - English
Description : 2000 Question with Answer.
₹151 [₹500]
6.IOCL Engineer/Officer (Grade A) Electrical Exam - English
Description : 3000 Question with Answer.
₹181 [₹500]
7.IOCL Engineer/Officer (Grade A) Electrical Exam - English
Description : 4000 Quesiton with Answer.
₹201 [₹500]
8.IOCL Engineer/Officer (Grade A) (Chemical) Exam - Hindi
Description : 1000 Question with Answer.
₹101 [₹500]
9.IOCL Engineer/Officer (Grade A) (Chemical) Exam - Hindi
Description : 2000 Question with Answer.
₹151 [₹500]
10.IOCL Engineer/Officer (Grade A) (Chemical) Exam - English
Description : 1000 Question with Answer.
₹101 [₹500]
11.IOCL Engineer/Officer (Grade A) (Chemical) Exam - English
Description : 2000 Question with Answer.
₹151 [₹500]
12.IOCL Engineer/Officer (Grade A) (Instrumentation) Exam - Hindi
Description : 1000 Question with Answer.
₹101 [₹500]
13.IOCL Engineer/Officer (Grade A) (Instrumentation) Exam - Hindi
Description : 2000 Question with Answer.
₹151 [₹500]
14.IOCL Engineer/Officer (Grade A) Instrumentation Exam - English
Description : 1000 Question with Answer.
₹101 [₹500]
15.IOCL Engineer/Officer (Grade A) Instrumentation Exam - English
Description : 2000 Question with Answer.
₹151 [₹500]
Back to Exam