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Electrical Engineering Key Concepts Quiz
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Electrical Engineering Key Concepts Quiz

Created by
@GlamorousWilliamsite4969

Questions and Answers

What is the noise voltage calculated using the formula $V_{noise} = \sqrt{4kTR(BW-f)}$ with Ambient Temperature 65⁰C, Frequency 10 kHz, Resistance 100 Ohms?

  • 1.9 nV
  • 0.1 microV
  • 1.9 microV (correct)
  • 1.0 nV

    • How should an uninterruptible power system be connected to the network?

  • Parallel to feed electrical power at critical time
  • Parallel to feed electrical power at normal time (correct)
  • Series to feed electrical power at critical time
  • Series to feed electrical power at normal time

    • In a power flow study, which statement is most correct?

  • One bus is a voltage-controlled bus, and others are slack or load buses
  • There may be multiple slack, voltage-controlled, and load buses designated.
  • One bus is designated as a slack bus, and the others are voltage-controlled or load buses (correct)
  • One bus is a load bus, and others are voltage-controlled or slack buses

    • Which type of engineer conducts reliability and sustainability tests?

    <p>Testing Engineer</p> Signup and view all the answers

    Which of the following statements is not correct based on Ohm’s Law?

    <p>Current / Potential = Constant</p> Signup and view all the answers

    What does the room amplifier in a wireless system amplify?

    <p>The received signal</p> Signup and view all the answers

    Harmonic currents in a power system may cause which of the following?

    <p>All of the above</p> Signup and view all the answers

    In the wind load formula for overhead line structures, what does the term Kz represent?

    <p>Guest Response Factor</p> Signup and view all the answers

    Which resonant modes does the oscillator circuit use?

    <p>Series Resonant</p> Signup and view all the answers

    What function does the OP-AMP circuit perform?

    <p>Integration</p> Signup and view all the answers

    What is the best economical way to start a single-phase motor?

    <p>Capacitive method</p> Signup and view all the answers

    What describes the strength of materials?

    <p>Ability to withstand an applied load without failure or plastic deformation</p> Signup and view all the answers

    For which circuit elements is superposition valid?

    <p>Independent source</p> Signup and view all the answers

    What is the difference between EPROM and EEPROM?

    <p>EEPROM is erased by exposing ultraviolet and EPROM by electrically.</p> Signup and view all the answers

    Why is steel used in concrete structures?

    <p>Temperature expansion coefficient is the same as concrete</p> Signup and view all the answers

    For a 12 AWG wire, what should be the circuit breaker rating?

    <p>20A</p> Signup and view all the answers

    If the fuse rating is 8 Amperes, what does that mean?

    <p>It will melt if the current exceeds 8A</p> Signup and view all the answers

    What makes CMOS Inverter superior to R-Pull up inverters?

    <p>Smaller propagation delay</p> Signup and view all the answers

    The delay time for series of activities that would not affect the project timing is called what?

    <p>Total Slack (Total Float)</p> Signup and view all the answers

    Which one of the following does not describe ceramics?

    <p>High Conductivity</p> Signup and view all the answers

    Which device is used to measure potential difference?

    <p>Voltmeter</p> Signup and view all the answers

    The most appropriate site for a new library is one adjacent to which areas?

    <p>A residential neighborhood and recreation facilities</p> Signup and view all the answers

    What is usually specified with Number 34 in 'N34’ E'?

    <p>Bearing</p> Signup and view all the answers

    Changing the excitation in a grid connected to an alternator will have what effect?

    <p>Change in power factor of load</p> Signup and view all the answers

    Sensor transducers will transfer what?

    <p>Move to electrical signals</p> Signup and view all the answers

    What is the term for component arrangement for waves in transmitting and receiving?

    <p>Array</p> Signup and view all the answers

    What can a passive filter do?

    <p>Filter only</p> Signup and view all the answers

    Which type of material has high thermal and electrical conductivity?

    <p>Metal</p> Signup and view all the answers

    Given $V = 50 \cos(40wt + 30) + 28.2 \cos(40wt + 30)$ and $R = 5$, find P:

    <p>330</p> Signup and view all the answers

    What is the payback period for a project with initial investment of 2.0 million QR and net annual profit of 150,000 QR using a 10% desired rate of return?

    <p>4.55 years</p> Signup and view all the answers

    Which systems use Assembly language?

    <p>Both A &amp; B</p> Signup and view all the answers

    Which describes a weak power system?

    <p>Power system with low short circuit capability and high sensitivity to harmonics</p> Signup and view all the answers

    For the diagram shown, what is the required minimum clearance distance, R, if the phase voltage is 13,800V?

    <p>1.8m</p> Signup and view all the answers

    Project Control will occur at which stage?

    <p>Throughout the process</p> Signup and view all the answers

    What is the slip frequency if a 50Hz induction machine no-load speed is 2900 rpm?

    <p>1.67 Hz</p> Signup and view all the answers

    Which special purpose diode is formed by a junction between metals and a semiconductor?

    <p>A Schottky diode</p> Signup and view all the answers

    What is the worth after 5 years of an investment of One Million Qatari Riyals if the APR is 9% paid monthly?

    <p>1,538,634</p> Signup and view all the answers

    What is not part of Scope Management?

    <p>Execute Scope</p> Signup and view all the answers

    What process identifies, studies, analyzes, and rectifies the root cause of incidents?

    <p>Cause and Effect Analysis</p> Signup and view all the answers

    Which is not a typical type of activity dependency in time management?

    <p>Multiple dependency</p> Signup and view all the answers

    Which is not a resource related to activities?

    <p>Time</p> Signup and view all the answers

    When is the process of decomposing deliverables into manageable components complete?

    <p>Each work element can be found in the WBS</p> Signup and view all the answers

    Which does project life cycle differ from product life cycle?

    <p>Describes project management activities</p> Signup and view all the answers

    When is the best time to assign a project manager to a project?

    <p>Initiation</p> Signup and view all the answers

    What is called the process of scheduling periodic tasks based on the highest priority for tasks with the shortest period?

    <p>Rate monotonic</p> Signup and view all the answers

    What is the final step in defining a work breakdown structure?

    <p>Assign codes for each activity of the work package</p> Signup and view all the answers

    In transformer saturation, what occurs?

    <p>The efficiency decreases and the no load current increases</p> Signup and view all the answers

    Which statement is most nearly correct when using symmetrical components?

    <p>The three zero sequence current phasors are equal in magnitude and displaced by 120 degrees.</p> Signup and view all the answers

    To ensure an instrument does not drift with time, what should we do?

    <p>Calibrate it</p> Signup and view all the answers

    What are the most important components of sustainability?

    <p>All are equally important</p> Signup and view all the answers

    For the design and implementation of smoke detectors and door control systems, it is preferable to use what?

    <p>Microcontrollers</p> Signup and view all the answers

    What does QSAS stand for?

    <p>Qatar Sustainability Assessment System</p> Signup and view all the answers

    According to Brundtland Report, what are the three main pillars of sustainable development?

    <p>Economic, Environmental and Social factors</p> Signup and view all the answers

    What is the most commonly used circuit breaker in distribution level?

    <p>Vacuum</p> Signup and view all the answers

    Which transmission voltage is not applicable in Qatar?

    <p>400 kV</p> Signup and view all the answers

    Which of the following has the highest input impedance?

    <p>MOSFET</p> Signup and view all the answers

    What is the definition of a battery that has long self-discharge property?

    <p>Temperature</p> Signup and view all the answers

    What is the transconductance of BJT?

    <p>dIE / dIC</p> Signup and view all the answers

    The power factor of an alternator depends on what?

    <p>Load</p> Signup and view all the answers

    What is the induction load running at stability slip?

    <p>0</p> Signup and view all the answers

    If an induction motor speed at no load is 745 RPM, what is the rated speed?

    <p>750 RPM</p> Signup and view all the answers

    What type of RCC will give high tensile strength?

    <p>Both</p> Signup and view all the answers

    What is the resistance for a potential of 100W and 200V?

    <p>100 Ohms</p> Signup and view all the answers

    What is the unit of conductance?

    <p>Mho</p> Signup and view all the answers

    What is the unit of conductivity?

    <p>Mho</p> Signup and view all the answers

    What is the unit of resistance?

    <p>Ohm</p> Signup and view all the answers

    What is the unit of resistivity?

    <p>Ohm-m</p> Signup and view all the answers

    What is the primary concern when using current transformers with a differential relay?

    <p>The trip could occur only when the CTs are wired in parallel.</p> Signup and view all the answers

    A wristwatch mercury cell has what capacity?

    <p>200 x 10 -3 AH</p> Signup and view all the answers

    Study Notes

    Electrical/Electronic Engineering Key Concepts

    • Thermal Noise Calculation

      • Formula: ( V_{noise} = \sqrt{4kTR(BW-f)} )
      • Parameters:
        • Ambient Temperature: 65°C
        • Boltzmann's constant ( k = 1.38 \times 10^{-23} )
        • Resistance: 100 Ohms
        • Frequency: 10 kHz

    • Uninterruptible Power Supply (UPS)

      • Should be connected in parallel to feed electrical power during normal operation.

    • Power-Flow Study

      • Importance of differentiating bus types:
        • Slack bus: Designated for voltage control.
        • Voltage-controlled & load buses serve specified roles.

    • Reliability Testing

      • Performed by Testing Engineers, focusing on system reliability and sustainability.

    • Ohm’s Law Misconceptions

      • Incorrect articulation: Current/Potential ≠ Constant.

    • Wireless Systems

      • The room amplifier amplifies encoded and modulated signals.

    • Harmonic Effects

      • Harmonics can cause excessive heating, circuit malfunctions, and resonance.

    • Resistance Combinations

      • Three 1-Ohm resistors yield 5 different total resistance values in various combinations.

    • Wind Load Calculation

      • Wind load ( L_{Si} ) involves parameters including ( Kz ), representing the Velocity Pressure Coefficient.

    • Lamp Resistance

      • For a 100W lamp at 200V, the resistance calculated is 400 Ohms.

    • Oscillator Circuit

      • Operates in series resonant mode using a crystal.

    • Operational Amplifiers (OP-AMP)

      • Functions vary; one may perform integration or differentiation.

    • Motor Starting Methods

      • Inductive method is ideal for starting single-phase motors economically.

    • Strength of Materials

      • Refers to their ability to withstand applied load without failure.

    • Superposition Principle

      • Valid for circuits incorporating independent sources.

    • EPROM vs. EEPROM

      • EEPROM is re-erasable electrically, whereas EPROM requires ultraviolet light for erasure.

    • Steel in Concrete Structures

      • Used for high rigidity and matching thermal expansion with concrete.

    • 12 AWG Wire Circuit Breaker Rating

      • Typical rating is 20A.

    • Fuse Rating

      • An 8A fuse melts if current exceeds 8A.

    • CMOS Inverter Advantages

      • Notable for high impedance and lower propagation delay.

    • Project Control

      • Integral throughout the entire project process, including construction.

    • Induction Motors

      • No-load speed and slip frequency calculations are essential for performance evaluation.

    • Types of Diodes

      • A Schottky diode is formed at the junction of metal and semiconductor.

    • Investment Returns

      • Payback period calculations utilize net profit and desired rate of return.

    • Sustainability Components

      • Economic, social, and environmental factors are equally vital.

    • Fire Alarm Systems

      • Microcontrollers are preferred for design and implementation.

    • QSAS Definition

      • Stands for Qatar Sustainability Assessment System.

    • Brundtland Report Attributes

      • Defines sustainability through economic, environmental, and social pillars.

    • Direct Costs in Projects

      • Examples exclude safety expenses, classified as indirect costs.

    • Work Breakdown Structure (WBS)

      • Decomposition is achieved when all work elements are manageable.

    • Circuit Breaker Functions

      • Differentiated by current interrupting capabilities and application in various contexts.

    • Battery Life Calculation

      • A mercury battery of specified capacity can last for 18 months at defined current draw.

    • Stability of Systems

      • Requires analysis against established criteria for assessing operational conditions.

    These notes summarize critical points and concepts essential for understanding Electrical/Electronic Engineering principles examined in the reviewer material.

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    Description

    Test your knowledge on key concepts in Electrical and Electronic Engineering. This quiz covers thermal noise calculations, UPS configurations, power-flow studies, and more. Challenge yourself to understand these fundamental principles!

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