Set 1

Questions and Answers

The equivalent circuit of an induction machine at no load is the same as that of the transformer but with:

Open circuited primary

Open circuited secondary

Short circuited primary

Short circuited secondary (correct)

Which of these is not a rule of interaction?

Etiquette

Communication (correct)

Ethics

Law

Morals

Within the battery, conventional current flow is:

Positive electrode to Negative electrode (correct)

Anode to Cathode

Cation to Anion

Activity on arrow needs to use dummy activities to avoid precedence problem that can happen due to:

Parallel Activities Signup and view all the answers

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?

Series, 1M ohm Signup and view all the answers

The offset of a particular segment varies from:

0000H to FFFFH Signup and view all the answers

The power gain of 30dB is equivalent to which amplification factor?

1000 Signup and view all the answers

Harmonics in a system are mainly due to:

All of the above Signup and view all the answers

Main objective of a transmission system:

Reliability Signup and view all the answers

Which of the following parallel resistances will have the highest value of the equivalent resistance?

Two 500 kOhm resistors Signup and view all the answers

In the receiver of a wireless system, we must amplify the received signal using:

A low-noise amplifier Signup and view all the answers

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?

120 Signup and view all the answers

In a 3-phase system, the neutral is:

Normal return path for the current Signup and view all the answers

Which circuit breaker is used at the distribution level?

Air circuit breaker Signup and view all the answers

Open circuit test on a transformer is conducted to obtain:

Core loss only Signup and view all the answers

The electric flux passing out through a closed surface is equal to:

The total charge enclosed by the surface Signup and view all the answers

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

550 Signup and view all the answers

What is the minimum diode power rating that can be used?

150 Signup and view all the answers

What is the required supply resistance to ensure proper operation of the Zener regulator circuit?

19 Signup and view all the answers

What is the maximum Zener current?

5.3 Amps Signup and view all the answers

Find the total float of activity D for the project:

3 Signup and view all the answers

The self-discharge rate of a lead-acid battery is least dependent on which of the following factors?

Concentration (specific gravity) of electrolyte Signup and view all the answers

The minimum standard wire gauge of earth wire is:

16 SWG Signup and view all the answers

The unit of current is:

Ampere Signup and view all the answers

The most economical method of starting a single-phase motor is:

Capacitance start method Signup and view all the answers

In the circuit shown, which resistor(s) is (are) redundant?

None Signup and view all the answers

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?

1.5 dB Signup and view all the answers

In a lossy transmission line, if the VSWR measured at the antenna end is 1.5, which of the following statements is correct?

The VSWR measured at transmitter end is equal to 1.5 Signup and view all the answers

Which of the following characteristics is not typical of a project manager?

Possesses in-depth technical knowledge Signup and view all the answers

The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be:

100 Signup and view all the answers

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?

80 Signup and view all the answers

Which type of braking is used in an induction motor?

All of the above Signup and view all the answers

What is the common or usual method to ensure that the final set of construction documents satisfy the client's program and design goals?

Have the client review a final check set for compliance with the program requirements and request that any corrections be noted. Signup and view all the answers

In a cascade amplifier, to reduce the loading effect at the output, the output impedance of the last stage should be:

Very small Signup and view all the answers

In a cascade amplifier, to reduce the loading effect at the input, the input impedance of the first stage should be:

Very high Signup and view all the answers

In which of the following circuits will the voltage source produce the most current?

10 Volt across two 10 Ohm resistances in parallel Signup and view all the answers

Which of the following theorem is used for frequency?

Shannon Theorem Signup and view all the answers

The main cause of transformer humming is:

Vibrations in the core lamination Signup and view all the answers

If the induction motor speed at no-load is 745 RPM, what is the speed of the motor?

750 RPM Signup and view all the answers

Synchronous speed for a motor is 1600 RPM at 60 Hz. Calculate the number of poles.

P = 4 Signup and view all the answers

At what region of operation is the base-emitter junction forward biased and the base-collector junction reverse biased for BJT?

Linear or active Signup and view all the answers

What is the role of the Zener diode?

Voltage regulation Signup and view all the answers

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?

30J Signup and view all the answers

Why do we use a power factor correction device?

Increase PF Signup and view all the answers

Rotor of an induction motor is rotating at synchronous speed, what is the torque?

Zero Signup and view all the answers

The underground cable is laid in a marine environment at system voltage. What shall be the design of the cable insulation?

√3A Signup and view all the answers

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?

0.75 Signup and view all the answers

An antenna has an effective aperture of 10m². What additional information is required to determine the amplifier power?

Power density Signup and view all the answers

10HP Single phase motor, 0.8 PF, 240V, Efficiency = 0.6. What is the current?

64.76 A Signup and view all the answers

Which of the following is not an opportunity to do the project?

Lot of Manpower Signup and view all the answers

For the shown block diagram, what is the dumping ratio O/P / I/P = U/R where S = 1?

0.4 Signup and view all the answers

An alternator is operating at __________ for capacitive loads.

Leading power factor Signup and view all the answers

The activity on node networks describes a project consisting of 8 tasks A-H. What is the minimum time to complete the project?

17 weeks Signup and view all the answers

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?

995 kHz Signup and view all the answers

For which of the following topologies can 10BaseT not be used without additional hardware conversion?

Bus Signup and view all the answers

High voltage windings of transformer have _________ resistivity than the low voltage side.

Equal Signup and view all the answers

ACR of conductor has 7 steel wires and 25 aluminum wires can be specified as:

25/7 Signup and view all the answers

The output D in the circuit is:

B(A+C) Signup and view all the answers

What is the speed of wave in the cable if the cable length is 1000m and time of returning signal is 9.43μsec?

0.75 Signup and view all the answers

An alternator is said to be over excited when it is operating at:

Lagging power factor Signup and view all the answers

A synchronous motor is said to be over excited when it is operating at:

Leading power factor Signup and view all the answers

A micro antenna is:

Integrated antenna Signup and view all the answers

What is the primary use for fast track scheduling:

To guarantee project cost prior to the start of building Signup and view all the answers

In Harvard Architecture:

Code and data spaces separated Signup and view all the answers

The direction of the force acting on a moving charge placed in a magnetic field is:

Perpendicular to the magnetic field Signup and view all the answers

The unit of conductance is:

Mho Signup and view all the answers

ABET stands for Accreditation Board for Engineer and Technology.

True Signup and view all the answers

For the circuit shown, the phase shift of the transfer function V/Vo at very high frequencies is:

90° Signup and view all the answers

The third harmonic of the Fourier series for the waveform in the figure has a frequency (Hz) of:

750 Signup and view all the answers

The wire placed on the top of a transmission line is a:

Ground wire Signup and view all the answers

Consider the three-stage r-f amplifier shown below. For this amplifier configuration, the total noise figure (dB) is most nearly:

8.6 Signup and view all the answers

Of the following engineering disciplines, who would be BEST suited to design and operate an automobile factory?

Mechanical Engineer Signup and view all the answers

Which of the following describes the leakage flux?

A flux outside the core Signup and view all the answers

Fast Tracking in Project means?

Start the project before the design is complete Signup and view all the answers

We have three resistances of values 2Ω, 3Ω, 6Ω. Which of the following combinations will give an effective resistance of 4Ω?

2Ω in series with parallel combination of 3Ω and 6Ω Signup and view all the answers

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

10.1 Signup and view all the answers

The condition for successful parallel operation of transformers is:

All of these Signup and view all the answers

The output of a NOR gate is HIGH if __________.

all inputs are LOW Signup and view all the answers

Digital telecommunication equipment provides connection-oriented AND/OR connection-less service. Connection-oriented service is provided by:

ATM Signup and view all the answers

Commercial AM Modulation technique is:

DSB-SC Signup and view all the answers

For fast switching of an NMOS R-pull up inverter (W/L) should be:

Large Signup and view all the answers

A real-time kernel is considered a 'bare bones' real-time operating system kernel should provide:

Task management, file management, memory management Signup and view all the answers

A certain communication signal uses a bandwidth (BW) of 2kHz. What is the classification of this signal?

Narrowband VLF Signup and view all the answers

In an induction motor, no load slip is generally:

Less than 1% Signup and view all the answers

Minimum voltage regulation occurs when the power factor of the load is:

Leading Signup and view all the answers

In medium-sized induction motors, the slip is generally around:

4% Signup and view all the answers

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?

2 Signup and view all the answers

If an alternator is over-excited:

PF is lagging Signup and view all the answers

The input impedance of a cascade amplifier will:

Same as the input impedance of first Signup and view all the answers

Rotor of an induction motor is rotating at synchronous speed. What is Torque?

Zero Signup and view all the answers

What does the power factor stand for?

Cosine of the angle between the voltage and current Signup and view all the answers

What is the minimum gauge size of the earthing cable?

16 Signup and view all the answers

To get rid of DC offset, use:

High pass filter Signup and view all the answers

For forward biasing:

Anode 5V cathode 3V Signup and view all the answers

Transformer resistivity:

High voltage equal to low voltage Signup and view all the answers

Amplifier working with good gain in:

Active region Signup and view all the answers

What is MOSFET?

Transistor Signup and view all the answers

To minimize loading effect, use?

Capacitors Signup and view all the answers

Alternator connected on no load condition, what affects the efficiency?

Armature losses Signup and view all the answers

Transformer saturation:

Low efficiency, high no load losses Signup and view all the answers

What will be the output impedance of a cascade amplifier to minimize the loading effect?

Low Signup and view all the answers

Uninterruptible Power System has to be connected to the network by:

Parallel to feed electrical power at critical time Signup and view all the answers

What is the purpose of the neutral line in a 3-phase power system?

As return path for the normal current Signup and view all the answers

An engineer received a new scope of work which is not included in the original scope. What action should he take?

He has to inform his boss first Signup and view all the answers

An active filter will:

Filter and Amplify Signup and view all the answers

Embedded system should have the best:

Dynamic response Signup and view all the answers

If the gain of an amplifier is 10 and it has negative feedback of 9%, what will be the gain if feedback is removed?

100 Signup and view all the answers

Humming of a transformer is due to:

Vibration of laminated core Signup and view all the answers

I = 5 Cos wt + 2 Cos wt, R = 3 Ohms, Find the wattage:

44 Signup and view all the answers

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.

0.71 Signup and view all the answers

High voltage winding of a transformer has ________ resistivity than the low voltage side.

Equal Signup and view all the answers

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:

15 Signup and view all the answers

The output D in the circuit is:

B(A+C) Signup and view all the answers

Power consumption in the advanced embedded system is:

10% Signup and view all the answers

Calculate the Vout:

4.3V Signup and view all the answers

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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Description

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.