This category focuses on multiple choice questions (MCQs) related to various engineering disciplines commonly tested in Pakistan’s engineering entrance exams, licensing exams, and professional development programs . The questions cover a wide range of engineering subjects , potentially including but not limited to: civil engineering, mechanical engineering, electrical engineering, computer engineering and software engineering . This section offers valuable practice materials for engineering students preparing for competitive entrance exams to engineering schools , engineers preparing for professional licensing examinations , and practicing engineers seeking to enhance their knowledge and skills through
What is the primary purpose of a heat exchanger in.
Question
- A. To generate electricity directly
- B. To increase fuel efficiency
- C. To transfer thermal energy between fluids
- D. To store thermal energy
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Correct Answer ( C )
In a power plant, the primary purpose of a heat exchanger is to transfer thermal energy between two fluids at different temperatures . This process is crucial for various stages of power generation . For example, a heat exchanger (often a boiler) transfers the heat of burning fuel to water, converting it into high pressure steam that then drives turbines to generate electricity . In other stages, heat exchangers might be used to cool components or reheat fluids for greater efficiency . The design and type of heat exchange
Which material is commonly used for the construction of high-strength,.
Question
- A. Steel
- B. Aluminum alloy
- C. Carbon fiber reinforced polymer
- D. Concrete
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Correct Answer ( C )
In aerospace engineering , minimizing weight is crucial for fuel efficiency and performance . High-strength, lightweight materials are essential for building aircraft and spacecraft components . Carbon fiber reinforced polymer (CFRP), also known as carbon fiber composite , is a prevalent choice . CFRP combines the high tensile strength of carbon fibers with the lightweight and moldable properties of a polymer matrix, allowing for the creation of strong, yet lightweight structures that can withstand the stresses of flight. Other materials like
What is the primary function of a PID controller in.
Question
- A. To amplify signals
- B. To filter noise
- C. To regulate a process variable
- D. To generate oscillations
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Correct Answer ( C )
A PID (proportional-integral-derivative) controller is a feedback control mechanism widely used in industrial control systems . Its primary function is to regulate a process variable (like temperature, pressure or speed) by continuously comparing the desired setpoint to the actual measurement value . The controller calculates an error signal (the difference between setpoint and measurement) and adjusts a manipulated variable (e.g., valve position and motor speed) to minimize the error . The combined action of these three terms