Questions and Answers
What will be the heat dissipation if the resistance of the conductor is decreased to half and the same current is applied for 5s?
Why do we use power factor correction devices?
If the rotor of an induction motor is rotating at synchronous speed, what is the torque?
What is the speed of the wave in the cable if the cable length is 1000m and the returning signal time is 9.43µsec?
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What additional information is required to determine the amplifier power if an antenna has an effective aperture of 10m²?
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What is the current of a 10 HP single-phase motor with a power factor of 0.8, 240V, and efficiency of 0.6?
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Which of the following is not an opportunity to do the project?
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An alternator is operating at __________ for capacitive loads.
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What tuning frequency is used in the local oscillator for an AM receiver set to 540 kHz with an IF of 455 kHz?
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For which of the following topologies can 10BaseT not be used without additional hardware conversion?
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High voltage windings of a transformer have _________ resistivity than the low voltage side.
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The ACR of a conductor with 7 steel wires and 25 aluminum wires can be specified as:
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The equivalent circuit of an induction machine at no load is the same as that of the transformer but with:
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Which of these is not a rule of interaction?
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Within the battery, conventional current flow is:
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Activity on arrow needs to use dummy activities to avoid precedence problems caused by:
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What is the average value of the signal $v(t) = 5 ext{sin}(377t)$?
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What is the per unit impedance for a 3 phase transformer (25 MVA, 66-12.47 kV, delta-wye connected, 8 percent impedance) on the 100 MVA base?
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The offset of a particular segment varies from:
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The power gain of 30 dB is equivalent to which amplification factor?
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Study Notes
Power Factor and Alternators
- An alternator operates at leading power factor when over-excited.
- Synchronous motors are over-excited at a leading power factor.
Antennas and Signal Frequency
- A micro antenna refers to a short antenna.
- The third harmonic frequency for a specified waveform is critical in Fourier series analysis.
Scheduling and Project Management
- Fast track scheduling aims to avoid future cost increases in projects.
- Fast tracking can initiate projects even prior to final design completion.
Circuit Theory and Electrical Components
- In Harvard Architecture, code and data spaces are separated.
- Leakage flux refers to flux other than mutual flux in transformers.
- The main purpose of the neutral line in a 3-phase system serves as a return path for normal current.
Amplifiers and Transistors
- Different configurations yield specific total noise figures in multi-stage amplifiers.
- For cascade amplifiers, high output impedance minimizes loading effects, while high input impedance reduces loading at the input.
Transformers
- Successful parallel operation of transformers requires correct polarity and matched voltage and frequency ratings.
- Hysteresis and core losses are evaluated in open circuit tests on transformers.
Electronic Components and Diodes
- The Zener diode functions primarily for voltage regulation.
- In amplifiers with negative feedback, the gain without feedback can be significantly higher than with it.
Communications and Signal Processing
- Digital telecommunication methods may include ATM for connection-oriented services.
- Harmonics mainly arise from variable impedance loads and power electronics.
Circuit Analysis
- The minimum gauge for earthing cables is an essential parameter for safety.
- The total float of a project's activity reflects scheduling flexibility and resource allocation.
Induction Motors and Torque
- Induction motors experience zero torque at synchronous speed.
- Slip in induction motors indicates the difference between synchronous speed and actual speed.
Safety and Regulations
- Circuit breakers at the distribution level ensure safe operation.
- The design of insulation for underground cables is crucial, especially in extreme environments.
Performance Calculations
- Effective resistance combinations in circuits require careful analysis to determine outcomes such as wattage.
- The current through a motor can be calculated using output power, efficiency, and voltage specifications.
Dependability and System Behavior
- The behavior of voltage sources across different resistances significantly affects current delivery.
- Transformer humming primarily results from core lamination vibrations.
Calculating Wave Speeds and Signal Transmission
- Velocity in cables can be derived from reflections and travel times of signals.
Project Opportunities and Risk Management
- Market demand, emerging opportunities, and resource availability drive project initiation and success.
- Project success hinges on stakeholder engagement and compliance with requirements.
Key Electrical Concepts
- The unit of conductance is the mho, which is equivalent to the reciprocal of ohm.
- The principle of magnetic field intensity can be calculated using current and distance from a wire.
These notes encapsulate critical concepts and contexts relevant to Electrical/Electronic Engineering, assisting in exam preparations and core understanding.### AM Receiver Tuning Frequency
- A super heterodyne AM receiver can tune to a station frequency of 540 kHz.
- Local oscillator frequency formula: Local Oscillator Frequency = Station Frequency + Intermediate Frequency (IF).
- For a 455 kHz IF, the local oscillator frequency is 995 kHz (540 kHz + 455 kHz).
Network Topologies and Hardware
- 10BaseT Ethernet cannot be used in a Bus topology without additional hardware conversion.
- Compatible topologies include Star and Tree.
Transformer Windings
- High voltage windings of a transformer generally have higher resistivity than low voltage windings.
ACR Conductor Specification
- A conductor with 7 steel wires and 25 aluminum wires can be specified as 7/25.
Logic Circuit Output
- The output D in a given logic circuit can be represented by the expression AB + BC.
Speed of Signal in Cable
- A cable length of 1000m with a return signal time of 9.43µsec calculates the speed of wave as 0.75 (m/µ sec).
Induction Machine and Transformer Equivalent Circuit
- The equivalent circuit of an induction machine at no load is similar to that of a transformer but features an open circuited secondary.
Rules of Interaction
- Etiquette, morals, and ethics are part of the rules of interaction, whereas laws typically govern them.
Conventional Current Flow in Battery
- Within a battery, conventional current flows from the positive electrode to the negative electrode (anode to cathode).
Precedence Problems in Project Management
- Dummy activities are utilized to avoid precedence problems primarily due to merge activities.
Average Value of a Signal
- The average value of the signal v(t) = 5 sin(377t) is calculated as approximately 3.2V (using the formula Vavg = 5 * 0.636).
Power Gain and Impedance in Transformers
- For a 3-phase transformer rated at 25MVA and an impedance of 8%, the per-unit impedance on a 100 MVA base is calculated to be 0.32.
Resistance in Circuit
- For a specified voltage range of 0-100V, a resistance of 1M ohm is required in a series configuration.
Memory Segment Offset
- The offset of a memory segment typically varies from 0000H to FFFFH.
Power Gain and Amplification Factor
- A power gain of 30 dB is equivalent to an amplification factor of 1000, determined by the equation dB = 10 log(Power2/Power1).
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Description
Test your knowledge on electrical and electronic engineering concepts with this comprehensive quiz. It covers topics such as alternators, synchronous motors, and micro antennas. Perfect for students preparing for their exams or anyone looking to refresh their understanding of these essential principles.
