Free Bachelor of Chemical Engineering Questions and Answers — Questions and Answers
Question 1: Which of the following is not a gadget that measures pressure?
- Manometer
- Barometer
- Galvanometer (Correct answer)
- None of the mentioned
Correct answer: Galvanometer
A manometer and a barometer are both instruments specifically designed to measure pressure. A manometer typically measures fluid pressure differences, while a barometer measures atmospheric pressure. A galvanometer, however, is an electromechanical instrument used for detecting and measuring electric current, not pressure.
Question 2: Which of the following is used to assess liquid pressure only?
- Piezometer (Correct answer)
- Manometer
- Differential Manometer
- None of the mentioned
Correct answer: Piezometer
A piezometer is a simple device used to measure the static pressure of a liquid at a specific point within a system. It typically consists of a vertical tube connected to the liquid, where the height of the liquid column indicates the pressure. Unlike manometers, which can measure gas or liquid pressure differences, piezometers are specifically designed for liquid pressure measurement.
Question 3: Which of the following qualifies as a state function?
- Work
- Heat
- Entropy (Correct answer)
- None of the mentioned
Correct answer: Entropy
In thermodynamics, a state function (or point function) is a property of a system that depends only on the current state of the system, not on the path taken to reach that state. Work and heat are path functions, meaning their values depend on the process undergone. Entropy, however, is a state function, representing the degree of randomness or disorder in a system at a given state.
Question 4: Which of the following is an example of water boiling in a container?
- Batch
- Semi-batch
- Neither of them (Correct answer)
- Batch & Semi-batch
Correct answer: Neither of them
Water boiling in an open container is typically considered an open system, as both mass (steam) and energy (heat) can be exchanged with the surroundings. A batch process involves no inflow or outflow of mass during the process, while a semi-batch process involves either inflow or outflow but not both simultaneously. Boiling water in an open container doesn't fit neatly into either definition as it's an open system with continuous mass and energy transfer.
Question 5: What statement regarding limiting reagents is accurate?
- Consumes completely (Correct answer)
- Does not react
- Consumes partially
- None of the mentioned
Correct answer: Consumes completely
A limiting reagent (or reactant) in a chemical reaction is the reactant that is completely consumed when the reaction goes to completion. Its availability determines the maximum amount of product that can be formed. Once the limiting reagent is used up, the reaction stops, regardless of how much of the other reactants are present.
Question 6: Which of the following relates to customer judgments of food?
- Food physics
- Sensory Analysis (Correct answer)
- Product Development
- Food microbiology
Correct answer: Sensory Analysis
Sensory analysis is a scientific discipline that uses human senses (sight, smell, taste, touch, hearing) to evaluate food and other products. It systematically measures, analyzes, and interprets responses to products as perceived by the senses. This field directly relates to understanding and quantifying customer judgments and preferences regarding food attributes.
Question 7: Which aspect of the food sector includes industry lobbying, local and international laws, quality and food safety, etc.?
- Regulation (Correct answer)
- R&D
- Wholesale and distribution
- Financial Services
Correct answer: Regulation
The "Regulation" aspect of the food sector encompasses all the rules, laws, and standards governing food production, processing, distribution, and sale. This includes industry lobbying to influence policy, adherence to local and international laws, and ensuring quality and food safety standards. These regulatory frameworks are crucial for consumer protection and market stability.
Question 8: Which of the following DOES NOT account for 90% of any food's dry weight?
- Fats
- Proteins
- Fibers (Correct answer)
- Carbohydrates
Correct answer: Fibers
The major macronutrients that make up the vast majority (often over 90%) of a food's dry weight are carbohydrates, proteins, and fats. While fibers are an important component of food, they are a type of carbohydrate and typically constitute a smaller percentage of the total dry weight compared to the combined amount of starches, sugars, proteins, and fats.
Question 9: Which of the following statements about the human body is untrue?
- Carbohydrates broken → Sugars
- Unconsumed water broken → fats (Correct answer)
- Fats broken down → Fatty acids and glycerol
- Proteins broken down → Amino acids
Correct answer: Unconsumed water broken → fats
The human body processes nutrients in specific ways: carbohydrates are broken down into sugars (glucose), fats into fatty acids and glycerol, and proteins into amino acids. Water, however, is not "broken down" into fats; it is essential for metabolic processes and hydration, but excess calories from any macronutrient can be converted and stored as fat. Therefore, the statement about water is incorrect.
Question 10: Which of the following statements accurately describes the Hagen-Poiseuille equation?
- Fluid is laminar (Correct answer)
- Fluid is uniform
- Fluid is compressible
- Fluid is turbulent
Correct answer: Fluid is laminar
The Hagen-Poiseuille equation describes the pressure drop in an incompressible Newtonian fluid flowing through a long cylindrical pipe. A fundamental assumption for this equation to be valid is that the fluid flow must be laminar. It does not apply to turbulent flow, where the fluid motion is chaotic and characterized by eddies and vortices.
Question 11: Which of the following gives the frictional coefficient for circular pipes?
- Re/16
- 64/Re (Correct answer)
- 16/Re
- Re/64
Correct answer: 64/Re
For laminar flow in a circular pipe, the Darcy friction factor (f) is given by the formula f = 64/Re, where Re is the Reynolds number. This relationship is derived from the Hagen-Poiseuille equation and is valid for Reynolds numbers typically below 2300, which defines the laminar flow regime. This formula helps quantify the frictional losses in such flows.
Question 12: Which of the following is not a fluid's global parameters?
- Density
- Viscosity
- External diameter (Correct answer)
- Mass flow rate
Correct answer: External diameter
Global parameters of a fluid describe its intrinsic properties or overall flow characteristics. Density and viscosity are intrinsic fluid properties, while mass flow rate describes the overall quantity of fluid passing a point per unit time. The external diameter, however, is a geometric property of the conduit the fluid is flowing through, not an intrinsic property of the fluid itself or a global flow parameter.
Question 13: What mathematical method is employed to forecast physical parameters?
- Combustion analysis
- Pressure analysis
- Temperature analysis
- Dimensional analysis (Correct answer)
Correct answer: Dimensional analysis
Dimensional analysis is a powerful mathematical technique used to reduce the number of variables in a physical problem by identifying fundamental dimensions (like mass, length, time). It helps in predicting relationships between physical parameters and in scaling experimental results. This method is crucial for understanding complex phenomena and designing experiments in engineering and physics.
Question 14: Which of the following is being affected by the same forces?
- Kinematic similarity
- Conditional similarity
- Geometric similarity
- Dynamic similarity (Correct answer)
Correct answer: Dynamic similarity
Dynamic similarity exists between two systems (e.g., a model and a prototype) when the ratios of all corresponding forces are the same. This means that not only are the shapes geometrically similar and the flow patterns kinematically similar, but the forces causing the motion (e.g., inertial, viscous, gravitational) are also proportionally related. Achieving dynamic similarity is crucial for accurate model testing in fluid mechanics.
Question 15: Which of the following is a primary component of an organic compound?
- Carbon, Oxygen and Sulphur
- Carbon, Oxygen and Sulphur
- Carbon, Oxygen and Nitrogen
- Carbon, Oxygen and Hydrogen (Correct answer)
Correct answer: Carbon, Oxygen and Hydrogen
Organic compounds are primarily defined by the presence of carbon atoms, typically bonded to hydrogen atoms. Oxygen is also a very common element found in many organic compounds, forming functional groups like alcohols, aldehydes, ketones, and carboxylic acids. While other elements like nitrogen, sulfur, and halogens can be present, carbon, hydrogen, and oxygen are the most fundamental and prevalent components.
Question 16: Which of the aforementioned makes up the lion's share of natural gas?
- Pentane
- Butane
- Ethane
- Methane (Correct answer)
Correct answer: Methane
Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane. Methane (CH4) typically makes up 70-90% of natural gas, with smaller amounts of other hydrocarbons like ethane, propane, and butane, as well as non-hydrocarbon gases like nitrogen and carbon dioxide. Its high methane content makes it an efficient fuel source.
Free Bachelor of Chemical Engineering Questions and Answers
Which of the following is not a gadget that measures pressure?