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OpenStem
@openstem · Joined Jul 2026
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Quiz6 questions
A 6 Ω resistor is connected across a 18 V supply. What current flows through it?
A0.3 AB3 AC108 AD24 A
Engineering · L3 · Ohm's Law & Power
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Engineering · L3 · Ohm's Law & PowerQuiz6 questions
What does an ideal op-amp amplify?
AThe voltage at its non-inverting input onlyBThe difference between its two input voltagesCThe current flowing into its inputsDThe temperature of the surrounding circuit
Engineering · L3 · Op-Amps & Basic Amplification
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Engineering · L3 · Op-Amps & Basic AmplificationQuiz6 questions
A pipe has cross-sectional area 0.02 m² and water flows through it at 3 m/s. What is the volumetric flow rate Q?
A0.006 m³/sB0.06 m³/sC0.6 m³/sD6 m³/s
Engineering · L3 · Flow Rate & Continuity Quiz
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Engineering · L3 · Flow Rate & Continuity QuizQuiz6 questions
What causes a solid material to expand when it is heated?
AThe atoms themselves grow largerBIncreased atomic vibration pushes neighboring atoms slightly farther apart on averageCThe material absorbs extra atoms from the surrounding airDChemical bonds break and reform at a larger spacing
Engineering · L3 · Thermal Expansion
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Engineering · L3 · Thermal ExpansionQuiz6 questions
Which statement best describes a design trade-off?
AA mistake the engineer made during testingBGiving up some of one desirable quality to gain more of anotherCA rule set by a government regulatorDThe final price of the finished product
Engineering · L3 · Design Trade-offs
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Engineering · L3 · Design Trade-offsQuiz6 questions
What is the key feature of a destructive test?
AIt is always cheaper than a non-destructive testBIt damages or destroys the part being testedCIt can be run on every unit in a batchDIt only checks the outside of a part
Engineering · L3 · Quality Control & Testing
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Engineering · L3 · Quality Control & TestingQuiz6 questions
A force of 50 N is applied at a perpendicular distance of 0.4 m from a bolt. What torque is produced?
A12.5 N·mB20 N·mC50.4 N·mD200 N·m
Engineering · L3 · Torque & Wrenches
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Engineering · L3 · Torque & WrenchesQuiz6 questions
What determines whether an object stays standing or tips over?
AWhether its total weight is above a certain amountBWhether a vertical line down from its center of mass falls inside its base of supportCWhether it is made of a dense materialDWhether its surface is smooth
Engineering · L3 · Center of Mass & Stability
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Engineering · L3 · Center of Mass & StabilityQuiz6 questions
A 220 µF capacitor is charged to 9 V. How much charge does it store?
A1.98 mCB24.4 mCC0.198 mCD9.9 mC
Engineering · L3 · Capacitors & Energy Storage
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Engineering · L3 · Capacitors & Energy StorageQuiz6 questions
An AND gate has inputs A = 1 and B = 1. What is the output?
A0B1CIt depends on which input arrived firstDUndefined
Engineering · L3 · Digital Logic Gates
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Engineering · L3 · Digital Logic GatesQuiz6 questions
What does specific heat capacity measure?
AThe total heat energy stored in an objectBThe heat energy needed to raise 1 kg of a material by 1 °CCThe temperature at which a material meltsDThe rate at which heat flows through a material
Engineering · L3 · Specific Heat Capacity
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Engineering · L3 · Specific Heat CapacityQuiz6 questions
A block with volume 0.05 m³ is fully submerged in water (ρ = 1000 kg/m³, g = 9.81 m/s²). What is the buoyant force on it?
A49.05 NB490.5 NC4905 ND9.81 N
Engineering · L3 · Buoyancy & Archimedes' Principle Quiz
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Engineering · L3 · Buoyancy & Archimedes' Principle QuizQuiz6 questions
In the phone stand case study, what is the first step of the design process?
ABuild a prototype immediatelyBDefine the problem and write down requirementsCTest with a real phoneDPick colors and materials
Engineering · L3 · Design Process Case Study
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Engineering · L3 · Design Process Case StudyQuiz6 questions
A project needs 300 bricks at $0.40 each, plus $250 for labor. What is the total cost?
A$120B$370C$250D$550
Engineering · L3 · Cost Estimation & Budgeting
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Engineering · L3 · Cost Estimation & BudgetingQuiz6 questions
A 10 mm-diameter bolt carries 5000 N in single shear. What is the shear stress?
A≈ 500 MPaB≈ 63.7 MPaC≈ 31.8 MPaD≈ 127.3 MPa
Engineering · L3 · Shear Stress
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Engineering · L3 · Shear StressQuiz6 questions
What is Euler's critical buckling load formula for a pinned-pinned column?
AP_cr = EI / LBP_cr = π²EI / L²CP_cr = π²EL / I²DP_cr = EI × L²
Engineering · L3 · Column Buckling
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Engineering · L3 · Column BucklingQuiz6 questions
Household power in the US is 120 V RMS. What is the peak voltage?
A84.9 VB120 VC169.7 VD240 V
Engineering · L3 · AC Circuits
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Engineering · L3 · AC CircuitsQuiz6 questions
Which terminal of an NPN transistor is the control input — the one where a small current turns the transistor on?
ABaseBCollectorCEmitterDCase
Engineering · L3 · Transistors as Switches
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Engineering · L3 · Transistors as SwitchesQuiz6 questions
What does viscosity measure in a fluid?
AA fluid's internal resistance to flowBA fluid's densityCA fluid's temperatureDA fluid's color
Engineering · L3 · Viscosity & Flow Regimes Quiz
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Engineering · L3 · Viscosity & Flow Regimes QuizQuiz6 questions
What is the defining feature of a heat exchanger?
AIt mixes two fluids together so they reach the same temperatureBIt transfers heat between two fluids without letting them physically mixCIt generates heat by burning fuelDIt stores fluid at high pressure for later use
Engineering · L3 · Heat Exchangers
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Engineering · L3 · Heat ExchangersQuiz6 questions
A failure mode is rated Severity 6, Occurrence 5, Detection 4. What is its Risk Priority Number (RPN)?
A30B20C15D120
Engineering · L3 · Failure Mode and Effects Analysis
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Engineering · L3 · Failure Mode and Effects AnalysisQuiz6 questions
According to professional engineering codes of ethics, which of these is typically placed above all other considerations?
AMeeting the project deadlineBThe safety, health, and welfare of the publicCMinimizing the project's costDSatisfying the client's exact preferences
Engineering · L3 · Ethics and Professional Responsibility
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Engineering · L3 · Ethics and Professional ResponsibilityQuiz6 questions
What is fatigue failure, in engineering terms?
AFailure caused by a single overload exceeding the material's ultimate strengthBFailure caused by repeated cyclic loading at a stress level below the material's static yield strengthCFailure caused only by exposure to high temperaturesDFailure that only ever affects brittle, non-metal materials
Engineering · L3 · Fatigue & Cyclic Loading
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Engineering · L3 · Fatigue & Cyclic LoadingQuiz6 questions
What is specific strength?
AStrength minus densityBStrength divided by densityCDensity divided by strengthDStrength multiplied by density
Engineering · L3 · Strength-to-Weight Material Selection Quiz
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Engineering · L3 · Strength-to-Weight Material Selection QuizQuiz6 questions
A voltage divider has Vin = 9 V, R1 = 1 kΩ, R2 = 2 kΩ. What is Vout?
A6 VB3 VC4.5 VD1.5 V
Engineering · L3 · Voltage Dividers
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Engineering · L3 · Voltage DividersQuiz6 questions
Three resistors — 4 Ω, 6 Ω, and 10 Ω — are connected in series. What is Req?
A20 ΩB14 ΩC0.15 ΩD60 Ω
Engineering · L3 · Equivalent Resistance
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Engineering · L3 · Equivalent ResistanceQuiz6 questions
A pump boosts water pressure by 49,000 Pa. Using ρ = 1000 kg/m³ and g = 9.8 m/s², what head does this represent?
A2.5 mB5 mC10 mD25 m
Engineering · L3 · Pumps & Head Quiz
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Engineering · L3 · Pumps & Head QuizQuiz6 questions
What does a higher R-value mean for a material?
AIt conducts heat more easilyBIt resists heat flow better — a better insulatorCIt stores more heat energy per kilogramDIt melts at a higher temperature
Engineering · L3 · R-Value & Thermal Resistance
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Engineering · L3 · R-Value & Thermal ResistanceQuiz6 questions
What is the critical path in a project schedule?
AThe single most expensive task in the projectBThe longest chain of dependent tasks, which sets the shortest possible finish timeCThe first task to start in the projectDAny task that has no dependencies
Engineering · L3 · Project Scheduling
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Engineering · L3 · Project SchedulingQuiz6 questions
What is the main goal of Design for Manufacturing (DFM)?
AMaking a part as visually detailed as possible on the CAD modelBDesigning a part so it is easy, fast, and cheap to actually manufactureCMaking every part completely custom so it fits perfectlyDMaximizing the number of parts to increase precision
Engineering · L3 · Design for Manufacturing
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Engineering · L3 · Design for Manufacturing