Basic Flashcards
7 cards from real Fundamentals of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Basic flashcards as text
Which thermodynamic law states that energy cannot be created or destroyed?
Answer: First Law
The First Law of Thermodynamics is the law of conservation of energy.
What is the efficiency of a heat engine that absorbs 1000 J and rejects 600 J?
Answer: 40%
Efficiency η = (Q_H − Q_C) / Q_H = (1000 − 600) / 1000 = 0.40 = 40%.
Which process occurs at constant pressure?
Answer: Isobaric
An isobaric process occurs at constant pressure, while the other terms describe constant temperature, constant volume, and no heat transfer respectively.
The ideal gas law is best expressed as:
Answer: PV = nRT
The ideal gas law PV = nRT relates pressure, volume, moles, and temperature using the universal gas constant R.
Entropy is a measure of:
Answer: Disorder or randomness of a system
Entropy quantifies the degree of disorder or the number of possible microscopic configurations of a thermodynamic system.
Which heat transfer mode requires a medium (fluid or solid) and involves bulk movement?
Answer: Convection
Convection transfers heat through the bulk motion of a fluid, unlike conduction (direct contact) or radiation (electromagnetic waves).
A Carnot engine operates between 800 K and 400 K. What is its maximum theoretical efficiency?
Answer: 50%
Carnot efficiency = 1 − T_L/T_H = 1 − 400/800 = 0.50 = 50%.