PE Mechanical Thermal Fluids Practice Questions - PE Mechanical Thermal and Fluids Systems Exam - PE Mechanical Thermal Fluids Practice Questions - PE Mechanical Thermal and Fluids Systems Exam

Question 1

Which statement is the correct form of the first law of thermodynamics applied to a closed system undergoing a process?

Q + W = ΔU, where W is work done on the system Q − W = ΔU, where W is work done by the system Q + W = ΔH, where W is work done by the system Q − W = ΔH, where W is work done on the system

Correct Answer:

Q − W = ΔU, where W is work done by the system

Question 2

Saturated water at 100 kPa has hf = 417 kJ/kg and hfg = 2258 kJ/kg. What is the enthalpy of wet steam at 100 kPa and quality x = 0.85?

1919 kJ/kg 2336 kJ/kg 2675 kJ/kg 2086 kJ/kg

Correct Answer:

2336 kJ/kg

Question 3

An ideal Carnot heat engine operates between a hot reservoir at 800 K and a cold reservoir at 300 K. What is its thermal efficiency?

37.5% 62.5% 266.7% 100%

Correct Answer:

62.5%

Question 4

A simple ideal Rankine cycle has boiler pressure 8 MPa and condenser pressure 10 kPa. Steam leaves the boiler superheated with h3 = 3399 kJ/kg. After isentropic expansion h4 = 2200 kJ/kg, and pump work raises h1 to 200 kJ/kg from h2 = 192 kJ/kg (saturated liquid at 10 kPa). What is the cycle thermal efficiency?

27.4% 37.4% 44.6% 33.5%

Correct Answer:

37.4%

Question 5

The actual enthalpy drop across a steam turbine is 800 kJ/kg, while the isentropic (ideal) drop for the same inlet and exit pressure is 1000 kJ/kg. What is the isentropic efficiency of the turbine?

1.25 0.80 0.20 0.90

Correct Answer:

0.80

Question 1

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Prepare with the PE Mechanical Thermal Fluids Practice Questions - PE Mechanical Thermal and Fluids Systems Exam practice quiz. This question bank includes 100 questions covering water, pressure, steam, cycle, and heat. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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PE Mechanical Thermal Fluids Practice Questions - PE Mechanical Thermal and Fluids Systems Exam

This practice set contains 100 questions from the matching question bank and focuses on water, pressure, steam, cycle, and heat. 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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PE Mechanical Thermal Fluids Practice Questions - PE Mechanical Thermal and Fluids Systems Exam

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