HKIE Professional Assessment - Energy Discipline Practice Questions - HKIE Professional Assessment - Energy Discipline (Hong Kong Institution of Engineers) Exam - HKIE Professional Assessment - Energy Discipline Practice Questions - HKIE Professional Assessment - Energy Discipline (Hong Kong Institution of Engineers) Exam

Question 1

Which of the following statements correctly states the First Law of Thermodynamics as applied to a steady-flow open energy system?

The total rate of heat added to the system minus the net rate of work done by the system equals the net rate of energy outflow carried by fluid mass streams. The total entropy of an isolated thermal system must always increase over time during any irreversible energy transformation. Heat cannot spontaneously flow from a lower temperature body to a higher temperature body without external mechanical work input. The absolute zero temperature is reached when all molecular thermal kinetic energy ceases.

Correct Answer:

The total rate of heat added to the system minus the net rate of work done by the system equals the net rate of energy outflow carried by fluid mass streams.

Question 2

A thermal power plant operates between a heat source at 500 °C (773.15 K) and a heat sink at 30 °C (303.15 K). What is the maximum theoretical Carnot cycle thermal efficiency of this power plant?

60.8% 94.0% 39.2% 55.0%

Correct Answer:

60.8%

Question 3

In heat transfer analysis for energy efficiency, what is the main advantage of using the Logarithmic Mean Temperature Difference (LMTD) method over a simple arithmetic mean temperature difference?

LMTD accounts for the non-linear variation of temperature difference along the heat exchanger flow length. LMTD allows direct calculation without knowing fluid inlet and outlet temperatures. LMTD eliminates the requirement for heat transfer coefficient determination. LMTD applies only to phase-change boiling heat transfer processes.

Correct Answer:

LMTD accounts for the non-linear variation of temperature difference along the heat exchanger flow length.

Question 4

An industrial boiler burns town gas with a Lower Heating Value (LHV) of 17.5 MJ/m³. If the boiler consumes 400 m³/h of gas and generates steam absorbing 1,500 kW of thermal power, what is the boiler thermal efficiency?

77.1% 85.7% 68.5% 92.3%

Correct Answer:

77.1%

Question 5

Which parameter defines the Maximum Useful Work obtainable from an energy flow stream relative to a specified reference environment?

Exergy (or Available Energy) Enthalpy Internal Energy Entropy

Correct Answer:

Exergy (or Available Energy)

Question 1

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Prepare with the HKIE Professional Assessment - Energy Discipline Practice Questions - HKIE Professional Assessment - Energy Discipline (Hong Kong Institution of Engineers) Exam practice quiz. This question bank includes 100 questions covering energy, power, building, heat, and audit. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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HKIE Professional Assessment - Energy Discipline Practice Questions - HKIE Professional Assessment - Energy Discipline (Hong Kong Institution of Engineers) Exam

This practice set contains 100 questions from the matching question bank and focuses on energy, power, building, heat, and audit. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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HKIE Professional Assessment - Energy Discipline Practice Questions - HKIE Professional Assessment - Energy Discipline (Hong Kong Institution of Engineers) Exam

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