Questions and Answers
The equivalent circuit of an induction machine at no load is the same as that of the transformer but with:
Which of these is not a rule of interaction?
Within the battery, conventional current flow is:
Activity on arrow needs to use dummy activities to avoid precedence problem that can happen due to:
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A DC Voltmeter with coil resistance 150 ohm to be measured with a sensitivity of 10,000 ohm/volt and the voltage Range 0-100V. What type and magnitude of resistance required?
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The offset of a particular segment varies from:
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The power gain of 30dB is equivalent to which amplification factor?
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Harmonics in a system are mainly due to:
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Main objective of a transmission system:
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Which of the following parallel resistances will have the highest value of the equivalent resistance?
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In the receiver of a wireless system, we must amplify the received signal using:
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If an overcurrent relay is used to protect a circuit with a maximum 3-phase fault current of 8000A, what is the excitation voltage (V) that must be developed by the current transformer?
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In a 3-phase system, the neutral is:
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Which circuit breaker is used at the distribution level?
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Open circuit test on a transformer is conducted to obtain:
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The electric flux passing out through a closed surface is equal to:
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The output is to be maintained at 24V, while the input varies from 120V to 126V with a load current ranging from 0A to 5A. Assume ideal conditions, that is the keep alive current is zero and the Zener resistance RZ is negligible: What is the minimum power of the supply resistor
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What is the minimum diode power rating that can be used?
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What is the required supply resistance to ensure proper operation of the Zener regulator circuit?
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What is the maximum Zener current?
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Find the total float of activity D for the project:
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The self-discharge rate of a lead-acid battery is least dependent on which of the following factors?
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The minimum standard wire gauge of earth wire is:
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The unit of current is:
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The most economical method of starting a single-phase motor is:
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In the circuit shown, which resistor(s) is (are) redundant?
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A copper cable used in a plain old telephone service line has a loss of 1.5 dB/km. What is the approximate loss experienced if the user is located 1.5 km from a central office?
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In a lossy transmission line, if the VSWR measured at the antenna end is 1.5, which of the following statements is correct?
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Which of the following characteristics is not typical of a project manager?
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The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be:
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A DC current of 50A is flowing in an isolated wire. What is the magnitude of the magnetic field intensity, H (A/m), 10 cm from the center of the wire, given H = I / 2πr?
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Which type of braking is used in an induction motor?
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What is the common or usual method to ensure that the final set of construction documents satisfy the client's program and design goals?
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In a cascade amplifier, to reduce the loading effect at the output, the output impedance of the last stage should be:
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In a cascade amplifier, to reduce the loading effect at the input, the input impedance of the first stage should be:
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In which of the following circuits will the voltage source produce the most current?
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Which of the following theorem is used for frequency?
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The main cause of transformer humming is:
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If the induction motor speed at no-load is 745 RPM, what is the speed of the motor?
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Synchronous speed for a motor is 1600 RPM at 60 Hz. Calculate the number of poles.
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At what region of operation is the base-emitter junction forward biased and the base-collector junction reverse biased for BJT?
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What is the role of the Zener diode?
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The heat loss inside a straight conductor is 60J upon applying current I for 5s. If the resistance of the conductor is decreased to half, and the same current is applied for 5s, what will be the heat dissipation?
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Why do we use a power factor correction device?
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Rotor of an induction motor is rotating at synchronous speed, what is the torque?
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The underground cable is laid in a marine environment at system voltage. What shall be the design of the cable insulation?
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What is the speed of the wave in the cable if the cable length is 1000m and the time of returning signal is 9.43μsec?
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An antenna has an effective aperture of 10m². What additional information is required to determine the amplifier power?
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10HP Single phase motor, 0.8 PF, 240V, Efficiency = 0.6. What is the current?
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Which of the following is not an opportunity to do the project?
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For the shown block diagram, what is the dumping ratio O/P / I/P = U/R where S = 1?
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An alternator is operating at __________ for capacitive loads.
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The activity on node networks describes a project consisting of 8 tasks A-H. What is the minimum time to complete the project?
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A super heterodyne AM receiver with an intermediate frequency (IF) of 455 kHz is to be tuned to listen to a station at 540 kHz. What tuning frequency is used in the local oscillator?
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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 transformer have _________ resistivity than the low voltage side.
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ACR of conductor has 7 steel wires and 25 aluminum wires can be specified as:
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The output D in the circuit is:
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What is the speed of wave in the cable if the cable length is 1000m and time of returning signal is 9.43μsec?
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An alternator is said to be over excited when it is operating at:
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A synchronous motor is said to be over excited when it is operating at:
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A micro antenna is:
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What is the primary use for fast track scheduling:
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In Harvard Architecture:
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The direction of the force acting on a moving charge placed in a magnetic field is:
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The unit of conductance is:
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ABET stands for Accreditation Board for Engineer and Technology.
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For the circuit shown, the phase shift of the transfer function V/Vo at very high frequencies is:
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The third harmonic of the Fourier series for the waveform in the figure has a frequency (Hz) of:
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The wire placed on the top of a transmission line is a:
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Consider the three-stage r-f amplifier shown below. For this amplifier configuration, the total noise figure (dB) is most nearly:
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Of the following engineering disciplines, who would be BEST suited to design and operate an automobile factory?
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Which of the following describes the leakage flux?
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Fast Tracking in Project means?
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We have three resistances of values 2Ω, 3Ω, 6Ω. Which of the following combinations will give an effective resistance of 4Ω?
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This question investigates the performance of the temperature sensor shown below. The temperature sensor is linear with the following circuit voltages.
Vs = 0 mV at 0°C Vo = 100 mV at 100°C The operation amplifier (op amp) is ideal. At 100°C, the maximum output voltage at Vo/Vs due to the tolerances in Rz is most nearly
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The condition for successful parallel operation of transformers is:
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The output of a NOR gate is HIGH if __________.
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Digital telecommunication equipment provides connection-oriented AND/OR connection-less service. Connection-oriented service is provided by:
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Commercial AM Modulation technique is:
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For fast switching of an NMOS R-pull up inverter (W/L) should be:
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A real-time kernel is considered a 'bare bones' real-time operating system kernel should provide:
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A certain communication signal uses a bandwidth (BW) of 2kHz. What is the classification of this signal?
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In an induction motor, no load slip is generally:
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Minimum voltage regulation occurs when the power factor of the load is:
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In medium-sized induction motors, the slip is generally around:
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The manufacturing company gets materials from 2 suppliers, X & Y. If X delays the procurement of materials by 2 days and the company takes 10 days to obtain the material, what shall be the delays (days) for product completion?
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If an alternator is over-excited:
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The input impedance of a cascade amplifier will:
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Rotor of an induction motor is rotating at synchronous speed. What is Torque?
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What does the power factor stand for?
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What is the minimum gauge size of the earthing cable?
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To get rid of DC offset, use:
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For forward biasing:
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Transformer resistivity:
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Amplifier working with good gain in:
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What is MOSFET?
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To minimize loading effect, use?
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Alternator connected on no load condition, what affects the efficiency?
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Transformer saturation:
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What will be the output impedance of a cascade amplifier to minimize the loading effect?
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Uninterruptible Power System has to be connected to the network by:
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What is the purpose of the neutral line in a 3-phase power system?
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An engineer received a new scope of work which is not included in the original scope. What action should he take?
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An active filter will:
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Embedded system should have the best:
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If the gain of an amplifier is 10 and it has negative feedback of 9%, what will be the gain if feedback is removed?
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Humming of a transformer is due to:
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I = 5 Cos wt + 2 Cos wt, R = 3 Ohms, Find the wattage:
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A 1000m cable is terminated with a short circuit at the far end. The first reflected wave appears 9.43μs after the incident wave. The actual velocity in the cable divided by the speed of light is: Vp = 2L/To.
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High voltage winding of a transformer has ________ resistivity than the low voltage side.
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Three 30μF capacitors are connected in a star (Y) form between the terminals A, B, C and a junction point N. The capacitance (μF) between terminals A and B is most nearly:
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The output D in the circuit is:
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Power consumption in the advanced embedded system is:
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Calculate the Vout:
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Study Notes
Alternator and Synchronous Motor
- An alternator operates in over-excited condition when the power factor is leading.
- A synchronous motor is considered over-excited at leading power factor as well.
Antenna Types
- Micro antennas are characterized as short antennas, differing from integrated and long antennas.
Project Scheduling
- Fast track scheduling is utilized primarily to avoid future cost increases in construction projects.
Harvard Architecture
- In Harvard Architecture, code and data spaces are separated, allowing for simultaneous access.
Magnetic Field Dynamics
- The force on a moving charge in a magnetic field acts perpendicular to the magnetic field direction.
Conductance Unit
- Conductance is measured in mho, which is the reciprocal of ohm.
ABET Certification
- ABET represents the Accreditation Board for Engineering and Technology, confirming educational quality in engineering.
Transfer Function Phase Shift
- At very high frequencies, the phase shift of the transfer function V/Vo can be -90°.
Harmonic Analysis
- The third harmonic frequency in a Fourier series for a specified waveform is significant for analysis.
Transmission Line Components
- The wire located on top of a transmission line typically serves as a phase wire.
RF Amplifier Configuration
- The noise figure in a three-stage RF amplifier configuration is crucial for performance assessment.
Leakage Flux
- Leakage flux refers to the flux that is outside the core and does not link with the primary or secondary.
Fast Track Project Management
- Fast tracking entails starting project phases before the preceding design is fully complete.
Resistance Combinations
- Effective resistance of 4Ω can be achieved through specific series and parallel combinations of resistances.
Temperature Sensor Output
- Output voltage of a temperature sensor can be calculated based on specified circuit voltages across temperature changes.
Transformer Operation
- Successful parallel operation of transformers requires matching impedance ratios, polarity accuracy, and identical voltage ratings.
Logic Gates
- A NOR gate outputs a HIGH signal when all of its inputs are LOW.
Connection-oriented Services
- Connection-oriented digital telecommunications services are exemplified by technologies such as ATM.
AM Modulation Techniques
- Commercial AM modulation typically employs DSB-LC (Double Sideband Large Carrier) techniques.
NMOS Inverter Design
- NMOS R-pull up inverter design should ideally have a large width-to-length ratio (W/L) for fast switching.
Real-time Kernels
- Essential functions of a real-time kernel include task scheduling, dispatching, and inter-task communication.
Signal Classification
- A communication signal with a bandwidth of 2kHz is classified as voice grade HF.
Induction Motor Characteristics
- No load slip for induction motors is generally very low, often less than 1%.
Voltage Regulation
- Minimum voltage regulation occurs when the load power factor is unity, emphasizing energy efficiency.
Timing Delays in Supply Chains
- Delays in material procurement significantly impact overall project completion times.
Alternator Excitation
- When over-excited, an alternator operates at a leading power factor.
Cascade Amplifier Input Impedance
- The input impedance of a cascade amplifier reflects the characteristics of the stage prior to the last.
Torque in Induction Motors
- If an induction motor’s rotor rotates at synchronous speed, the resulting torque is zero.
Power Factor Definition
- Power factor is defined as the cosine of the angle between voltage and current.
Earthing Cable Size
- The minimum acceptable gauge size for earthing cables is typically 8.
DC Offset Removal
- To eliminate DC offsets, a high pass filter is generally employed.
Forward Biasing Criteria
- Forward biasing in diodes requires the anode voltage to exceed the cathode voltage.
Transformer Resistivity
- High voltage transformer windings generally have higher resistivity compared to low voltage windings.
Cascaded Capacitance in Star Configuration
- For three capacitors in a star connection, the capacitance between two terminals can be calculated based on their arrangement.
Digital Circuit Outputs
- The output of logical circuits can be determined through combinatorial expressions involving inputs.
Power in Embedded Systems
- Advanced embedded systems are characterized by low power consumption values typically below 1.
Vout Calculations
- Voltage output can be precisely calculated based on circuit specifications.
Harmonic Sources
- Harmonics in electrical systems often stem from variable impedance or saturated magnetic loads, including those from power electronic devices.
Transmission System Objectives
- Primary goals of power transmission systems focus on reliability, voltage regulation, power factor, and overall efficiency.
Parallel Resistance
- Equivalent resistance is highest in configurations with larger individual resistances in parallel.
Amplification in Wireless Systems
- Low-noise amplifiers are essential for amplifying signals received in wireless communications.
Overcurrent Relay Applications
- Overcurrent relays are critical for protecting electrical circuits against faults, calculated based on current transformer ratios.
Neutral in 3-Phase Systems
- In a 3-phase system, the neutral line serves as a normal return path for current.
Circuit Breakers
- Standard circuit breakers used in distribution levels play a crucial role in circuit protection and control.### Circuit Breakers
- Air Circuit Breaker: Utilizes air as the primary medium for arc extinction during fault conditions.
- Air Blast Circuit Breaker: Employs high-speed air blasts to extinguish arcs, often used in high voltage applications.
Transformer Testing
- Open Circuit Test Purpose: Conducted to measure Core Loss, which includes hysteresis and eddy current losses.
Electric Flux
- The electric flux through a closed surface equals the total charge enclosed by the surface according to Gauss's Law.
Zener Regulator Calculations
- Minimum Power of Supply Resistor: To maintain a 24V output with inputs of 120V to 126V and a load of 5A, minimum power ratings for supply resistors can be calculated.
- Diode Power Rating: Minimum power rating needs to be determined based on load conditions.
- Supply Resistance Requirement: Essential to ensure proper operation in Zener regulator setups, calculated via Zener current practices.
- Maximum Zener Current: Its value is dictated by load requirements and input variations.
Project Management
- Common practices involve using checklists, client reviews, and progress meetings to ensure client satisfaction with final construction documents.
Electrical Concepts
- Unit of Current: Measured in Amperes (A).
- Economic Method of Starting Motors: The Split-Phase Method is typically favored for single-phase motors.
- Self-Discharge Rate of Batteries: Least influenced by the Nominal Voltage of Battery.
Transmission Line Characteristics
- Cable Loss: A copper cable has a loss of 1.5 dB/km, meaning if located 1.5km away from the office, the total loss would be approximately 2.25 dB.
- VSWR Significance: VSWR (Voltage Standing Wave Ratio) impacts transmission line efficiency and is typically greater at the transmitter end than the antenna end when losses exist.
Motor Operations
- Induction motors can use various braking methods: Regenerative, Dynamic, and Plugging.
- Transformer Noise: The humming is mainly due to vibrations in the core lamination.
Amplitude and Frequency in Amplifiers
- In cascade amplifiers, high output impedance is necessary at the last stage to reduce loading effects.
- For input stages, high input impedance minimizes early stage loading.
Wave Speed in Cables
- A cable length of 1000m with a return signal time of 9.43μs yields calculated wave speed, relevant for signal integrity assessments.
Current Flow in Batteries
- Conventional Current Flow: Flows from the positive electrode to the negative electrode within a battery system.
Electrical Gain and Resistance
- Power Gain: A 30 dB gain equates to an amplification factor of 1000.
- Resistors in measurement setups are determined by required sensitivity and voltage range, impacting the chosen type and magnitude.
Antenna Design
- To fully estimate an amplifier's power requirement, knowledge of the power density and effective aperture of the antenna is essential.
General Electrical Knowledge
- Current and voltage measurements require understanding of resistance types (parallel vs. series) and how they relate to overall circuit behavior and efficiency.
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This is a comprehensive quiz consisting of 117 questions intended for classroom assessment. It is designed to test students' knowledge and understanding across various subjects. Complete the quiz in 59 minutes to evaluate your learning progress.