Questions for circuit debugging, These questions are custom designed by Bhushan and Adhithya to test your understanding. Only if you understood the concepts you will be able to answer these questions.
These questions were framed for Coloumb 2022 a symposium conducted by Rajalakshmi engineering college Thandalam, Chennai.
Basic Electrical - Circuit Theory (Multi-choice questions) - Mathankumar.S (V...Mathankumar S
Basic Electrical - Circuit Theory (Multi-choice questions) - Technical Skills Test Question Paper. This question paper is cover more topics and basic questions about circuit theory
This project is used to control the speed of brushless DC motor by using arduino development board with rpm display and pulse width modulation. It can be used in different industrial applications.
Questions for circuit debugging, These questions are custom designed by Bhushan and Adhithya to test your understanding. Only if you understood the concepts you will be able to answer these questions.
These questions were framed for Coloumb 2022 a symposium conducted by Rajalakshmi engineering college Thandalam, Chennai.
Basic Electrical - Circuit Theory (Multi-choice questions) - Mathankumar.S (V...Mathankumar S
Basic Electrical - Circuit Theory (Multi-choice questions) - Technical Skills Test Question Paper. This question paper is cover more topics and basic questions about circuit theory
This project is used to control the speed of brushless DC motor by using arduino development board with rpm display and pulse width modulation. It can be used in different industrial applications.
Introduction to Power Electronics, Power Diodes, Thyristors and Power Transistors. Different types of Power Converters, Applications of Power Electronics and Peripheral effects.
Alternating current signal
AC means Alternating Current and DC means Direct Current. AC and DC are also used when referring to voltages and electrical signals which are not currents! For example: a 12V AC power supply has an alternating voltage (which will make an alternating current flow).
These slides provide an elementary description of Power Electronics and its application domains. It also shows the different power devices and converters.
Introduction to Power Electronics, Power Diodes, Thyristors and Power Transistors. Different types of Power Converters, Applications of Power Electronics and Peripheral effects.
Alternating current signal
AC means Alternating Current and DC means Direct Current. AC and DC are also used when referring to voltages and electrical signals which are not currents! For example: a 12V AC power supply has an alternating voltage (which will make an alternating current flow).
These slides provide an elementary description of Power Electronics and its application domains. It also shows the different power devices and converters.
Biological control systems - Time Response Analysis - S.Mathankumar-VMKVECMathankumar S
Biological control systems - Time Response Analysis - Step and Impulse responses of first order and second order systems, Determination of time domain specifications of first and second order systems from its output responses.
Ec 2201 Electrical Engineering Question Paper for Anna University Exams - www...annaunivedu
Download Anna University Previous Year Question Papers for ECE, All Branches from http://www.annaunivedu.org ,
Share with your friends .
Anna UNiversity Important Questions
http://www.annaunivedu.org/electrical-engineering-important-question/
The Electronic Interview Service (EIS) strategically comprises of six question sets that test the candidate's abilities thoroughly. The timer driven nature of the questions ensures honest, professional and skill set values of the candidate are captured in a professional manner for objective assessment.
Network Theory Part 2 questions and answers for interviews, campus placements...Prasant Kumar
Networks Analysis, Networks Synthesis, MCQ, Questions & Answers, ohm’s law ,Sine function ,Linear,parabola,hyperbola, VIVA Questions, The voltage across R and L in a series RL circuit are found to be 200 V and 150 V respectively the rms value of the voltage across the series combination is _ V, Kirchhoff s current law ,reciprocity , duality, on-linearity ,linearity ,resistive elements, passive elements ,non-linear elements, linear bilateral elements , interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams, electrical engineering,
Network Theory Part 1 questions and answers for interviews, campus placements...Prasant Kumar
Networks Analysis, Networks Synthesis, MCQ, Questions & Answers, ohm’s law ,Sine function ,Linear,parabola,hyperbola, VIVA Questions, The voltage across R and L in a series RL circuit are found to be 200 V and 150 V respectively the rms value of the voltage across the series combination is _ V, Kirchhoff s current law ,reciprocity , duality, on-linearity ,linearity ,resistive elements, passive elements ,non-linear elements, linear bilateral elements , interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams, electrical engineering
1.The curve representing ohm's law is
a) Sine function
b) Linear
c) parabola
d) hyperbola
Ans- b
2. The voltage across R and L in a series RL circuit are found to be 200 V and 150 V respectively the rms value of the voltage across the series combination is _ V.
a) 360.
b) 250.
c) 200.
d) 450.
Ans: b
V = √( VR²+ VL²) = √( 200² + 150² ) = 250 V.
3. Kirchhoff s current law states that
(a) net current flow at the junction is positive
(b) Algebric sum of the currents meeting at the junction is zero
(c) no current can leave the junction without some current entering it.
(d) total sum of currents meeting at the junction is zero
Ans: b
According to Kirchhoffs voltage law, the algebraic sum of all IR drops and
e.m.fs. in any closed loop of a network is always
(a) negative
(b) positive
(c) determined by battery e.m.fs.
(d) zero
Ans: d
5. Kirchhoffs current law is applicable to only
(a) junction in a network
(b) closed loops in a network
(c) electric circuits
(d) electronic circuits
Ans: a
6. Superposition theorem can be applied only to circuits having
(a) resistive elements
(b) passive elements
(c) non-linear elements
(d) linear bilateral elements
Ans: d
7. The concept on which Superposition theorem is based is
(a) reciprocity
(b) duality
(c) non-linearity
(d) linearity
Ans: d
Business environment scanning market survey tools and techniques by mathankumarMathankumar S
Business Environment Scanning Market Survey Tools and Techniques (Its very clearly briefed about Entrepreneurship,
Entrepreneur, Need for Entrepreneur, Common Myths about Entrepreneurs, Benefits of Being an Entrepreneur, Innovation, Elements of Innovation, Creativity, Motivation, How should Engineer Think?, How to Identify and Motivate a Student?, Science Club, Entrepreneurship Development, Ministry of Skill Development and Entrepreneurship (MSDE), Pradhan Mantri Kaushal Vikas Yojana (PMKVY), Udyamita, Design Clinic Scheme for Design Expertise to MSME Manufacturing Sector, MSME Salient Features, MSME Schemes,
Prototype, Market Survey, MARKETING SUPPORT TO MSMEs, MARKET SURVEY FOR COMMERCIALIZATION, STARTING A NEW VENTURE, How to become a Successful Entrepreneur
Biomedical Circuits & Networks - Transient Analysis and Two Port NetworksMathankumar S
Biomedical Circuits & Networks - Transient Analysis and Two Port Networks (It includes AC and DC Response, R-L-C Circuits, time constant, Symmetrical networks, Z-Parameter, Y-Parameter ABCD Parameter and h-Parameter)
Biomedical Circuits & Networks - Network synthesis and filter designMathankumar S
Biomedical Circuits & Networks - Network synthesis and filter design (It includes cauer form, poles and zeros, Impedance function, Hurwitz polynominal, Positive real function, Types of filters, Initial value theorem, Butterworth filter, Chebyshev filter, Chebyshev approximation, Low pass filter, T and pie network, m -derived low pass filter, transfer function, selectivity parameter & discrimination parameter)
Biomedical Technical Skill Development - Questions (Multi Choice Type)Mathankumar S
Biomedical Technical Skill Development - Questions (Objective type Questions for Biomedical Engineering & Medical Electronics) - Students can able to get ideas about fundamentals
Biomedical Control Systems - BIOMEDICAL APPLICATIONS (Short Questions & Answers)Mathankumar S
Biomedical control systems - BIOMEDICAL APPLICATIONS (Short Questions & Answers) - ITS DEALS WITH Examples of Biological control Systems: Cardiovascular Control System, Endocrine Control Systems, Pupil Control System, Skeletal Muscle Servomechanism, Oculo - motor system, sugar level Control Mechanism. Temperature control, Blood pressure control.
Biomedical Control Systems - THE CONCEPT OF STABILITY & ROOT LOCUS TECHNIQUE ...Mathankumar S
Biomedical control systems - THE CONCEPT OF STABILITY & ROOT LOCUS TECHNIQUE (short Questions & Answers) - ITS DEALS WITH STABILITY OF THE SYSTEM (ROUTH HURWITZ CRITERION, ROUTH ARRAY), ROOT LOCUS TECHNIQUE, ZEROS & POLES,
Biomedical Control Systems - Time Response Analysis (Short Questions & Answers)Mathankumar S
Biomedical Control Systems - Time Response Analysis (Short Questions & Answers) - Its detailed about Standard Test Signals, Time Response Analysis of First and Second Order Systems, Steady state errors and Error constants, Effects of Adding Zero to a system, Damping System and PD & PID Controller.
Biomedical Control Systems - SYSTEM CONCEPTS (Short Questions & Answers)Mathankumar S
Biomedical Control Systems - SYSTEM CONCEPTS (Short Questions & Answers) - Its Deal with Types of systems, Open loop systems, Closed Loop systems, Effects of feedback, Mathematical Models of Physical systems: Introduction, Differential equations, Transfer functions, Block Diagram Algebra, Signal Flow Graphs.
Biological control systems - System Concepts-Mathankumar.S, VMKVECMathankumar S
Biological control systems - System Concepts- Basic structure of control system - Types of systems - Open loop systems, closed loop systems, Effects of feedback, Block diagram & Signal flow graph, conversion of block diagram to signal flow graph, reduction of block diagram and signal flow graph.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Top 10 Oil and Gas Projects in Saudi Arabia 2024.pdf
Electrical Circuits Objective Type Questions - Mathan
1. OBJECTIVES QUESTIONS
ELECTRIC CIRCUITS
1. Resistivity of a wire depends on
(a) length (b) material
(c) cross section area (d) none of the above
2. Two bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in
series to 250 volts supply. Power consumed in circuit is
(a) 33 watt (b) 67 watt
(c) 100 watt (d) 300 watt
3. A circuit contains two un-equal resistances in parallel
(a) current is same in both
(b) large current flows in larger resistor
(c) potential difference across each is same
(d) smaller resistance has smaller conductance
4. Conductance is expressed in terms of
(a) ohm/m (b) m/ohm
(c) mho/m (d) mho
5. Two resistances R1 and R2 give combined resistance of 4.5 ohms when in
series and 1 ohm when in parallel. The resistances are
(a) 3 ohms and 6 ohms (b) 3 ohms and 9 ohms
(c) 1.5 ohms and 3 ohms (d) 1.5 ohms and 0.5 ohms
6. When have three resistances of values 2, 3 and 6. Which of the following
combination will give an effective resistance of 4 ohms?
(a) All the three resistances in parallel
(b) 2 resistance in series with parallel combination of 3 ohm and 6 ohm
resistance
(c) 3 ohm resistance in series with parallel combination of 2 ohm and 6 ohm
resistance
2. (d) 6 ohm resistance in series with parallel combination of 2 ohm and 3 ohm
resistance.
7. Two 1 kilo ohm, ½ W resistors are connected in series. Their combined
resistance value and wattage will be
(a) 2k, ½ W (b) 2k, 1 W
(c) 2k, 2 W (d) 1k, ½ W
8. Which method can be used for absolute measurement of resistances?
(a) Ohm’s law method (b) Wheatstone bridge method
(c) Releigh method (d) Lortentz method
9. Three 3 ohm resistors are connected to form a triangle. What is the resistance
between any two of the corners?
(a) ¾ ohms (b) 3ohms
(c) 2 ohms (d) 4/3 ohms
10. Ohm’s law is not applicable to
(a) dc circuits (b) high currents
(c) small resistors (d) semi-conductors
11. Ohm’s law is not applicable in all the following cases Except
(a) Electrolytes (b) Arc lamps
(c) Insulators (d) Vacuum ratio values
12. The element of electric heater is made of
(a) copper (b) steel
(c) carbon (d) nichrome
13. Which of the following has negative temperature coefficient?
(a) Brass (b) Mercury
(c) Electrolytes (d) Silver
14. Variable resistors are
(a) Wire wound resistors (b) Thin film resistors
(c) Thick film resistors (d) Al of the above
3. 15. Low resistance can be accurately measured by
(a) Kelvin bridge (b) Wheat stone bridge
(c) Wein’s bridge (d) None of the above
16. Temperature coefficient of resistance is expressed in terms of
(a) ohms/ohms0C (b) mhos/ohm0C
(c) mhos/0C (d) ohms/0C
17. Which material is expected to have least resistivity?
(a) Copper (b) Lead
(c) Mercury (d) Zinc
18. The resistance temperature coefficient is defined as
(a) increase in resistance per degree centigrade
(b) decrease in resistance per degree centigrade
(c) the ratio of increase in resistance per degree centigrade
to the resistance at 00C
(d) the ratio of increases in resistance per degree centigrade
to the rate of rise of resistance at 00C
19. For a fixed supply voltage the current flowing through a conductor will
decrease when
(a) cross-sectional area of the conductor is increased
(b) length of the conductor is reduced
(c) length of the conductor is reduced
(d) cross-sectional area is increased and length is decreased
20. When current flows through heater coil it glows but supply wiring does not
glow because
(a) supply wiring is covered with insulation layer
(b) current through supply line flows at slower speed
(c) supply wires are made of superior material
(d) resistance of heater coil is more than that supply wires
4. 21. The resistance of 100 W, 200 W lamp is
(a) 100 (b) 200
(c) 400 (d) 1600
22. When checked with an ohm meter an open resistor reads
(a) zero (b) high but not zero
(c) low but not zero (d) infinite
23. Which of the following carbon coded resistor has value of 10 k with 20%
tolerance?
(a) Red, red, green and silver stripes
(b) Yellow, violet, yellow and silver stripes
(c) Orange, orange, black and gold stripes
(d) Brown, black, orange and no tolerance band
24. The form factor of a 220V, 50 Hz A.C. wave form is
(a) 1.5 (b) 1.14
(c) 1.11 (d) 0.85
25. The form factor of dc supply voltage is always
(a) zero (b) 0.5
(c) unity (d) infinite
26. The capacitors for power factor correction are rated in terms of
(a) Voltage (b) VA
(c) kW (d) KVAR
27. Poor power factor results in all of the following EXCEPT:
(a) overloading of transformers
(b) overloading of alternators
(c) reduction in power losses
(d) reduction in load handling capacity of electrical system
5. 28. Power factor of an inductive circuit can be improved by connecting a
capacitor to it in
(a) series (b) parallel
(c) either series or parallel (d) depends on the value of the capacitor
29. The effects due to electric current are
I. Magnetic effect
II. Heating effect
III. Luminous effect
Appliance working on which effect can be used on ac as well as dc supply?
(a) I only (b) II only
(c) II and III only (d) I, II and III
30. When a.c. flows through a resistance, then
(a) current leads emf (b) current lags emf
(c) current and e.m.f. are inphase (d) none of the above
31. The power factor of incandescent bulb is
(a) 0.8 lagging (b) 0.8 leading
(c) unity (d) zero
32. A incandescent bulb can work on
(a) ac only (b) dc only
(c) both ac as well as dc(d) depend on the shape of the coil
33. Which will draw least current
(a) 40 W lamp (b) 40 W tube light
(c) 40 W induction
34. A 160 W soldering iron is operated from the 60 Hz power line. The resistance
of the soldering iron is
(a) 10 ohms (b) 25.5 ohms
(c) 51.5 ohms (d) 75.6 ohms
6. 35. In a.c. circuits, the a.c. meters measure
(a) r.m.s. values (b) peak values
(c) mean value (d) mean square values
36. A capacitor
(a) offers easy path to a.c. but blocks d.c.
(b) offers easy path to d.c. but blocks a.c.
(c) offers easy path to both a.c. and d.c.
(d) block a.c.
37. The unit of inductive susceptance is
(a) Henry (b) Milli-henry
(c) Siemens (d) Ohms
38. An inductor supplied with 50V ac with a frequency of 10 kHz passes a
current of 7.96 mA. The value of inductor is
(a) 1mH (b) 10 mH
(c) 100 mH (d) 1 H
39. In a.c. circuit, the power is consumed only in
(a) inductance (b) capacitance
(c) resistance (d) all the given above
40. An electric bulb rated 220 V is connected 220 V, 5 Hz source. Then, the bulb
(a) does not glow (b) glows intermitteltly
(c) glows continuously (d) fuses
41. Which of the following refers to a parallel circuit?
(a) The equivalent resistance is greater than any one of the resistors
(b) The current through any one element is less than the source current
(c) The current through each element is the same
(d) The voltage across element is in proportion to its resistance value
7. 42. Capacitive susceptance is expressed in terms of
(a) Farads (b) Micro-farads
(c) Siemens (d) Ohms
43. Admittance is the reciprocal of
(a) capacitive reactance (b) inductive reactance
(c) reactive power (d) impedance
44. Which of the following case represents the largest mmf?
(a) A 20-turn coil wound around a 10 cm iron core and passing a current of 3
A
(b) A 60-turn coil wound around a 10 cm iron core and passing a current of 1
A
(c) A 100-turn coil wound around a 30 cm carboard core and passing a
current of 0.75A
45. Wattless current is possible, only in
(a) resistive circuit (b) non-resistive circuit
(c) LR-circuit (d) LCR-circuit
46. A series RL circuit is to operate at frequencies in the range of 100 Hz, 600 Hz.
It is required that the current lags the source vltage by at least 300 over this
range. If R = 1000 ohms, the appropriate value of L will be
(a) 0.92 H (b) 932 H
(c) 0.92 mH (d) 9.2 mH
47. A1 mH inductance and 10 F capacitance when connected in series to an a.c.
source, possess equal reactance. The angular frequency of the a.c. source is
(a) 104 (b) 100
(c) 10 (d) 200
48. In a series RC circuit as frequency increases
(a) current increases (b) current decreases
(c) remains unaltered
8. 49. A non-linear network does not satisfy
(a) homogeneity condition
(b) super-position condition
(c) both homogeneity as well as super-position condition
(d) homogeneity, super-position and associative condition
50. A non-linear network does not satisfy
(a) homogeneity condition
(b) super-position condition
(c) both homogeneity as well as super-position condition
(d) homogeneity, super-position and associative condition
51. An ideal current source has zero
(a) internal conductance (b) internal resistance
(c) voltage on no load (d) ripple
52. A terminal where three or more branches meet is known as
(a) combination (b) terminus
(c) anode (d) node
53. A closed path made by several branches of the network is known as
(a) circuit (b) branch
(c) junction (d) loop
54. Which of the following has non-linear V-I characteristics?
(a) Vacuum diode (b) Transistor
(c) Filament bulb (d) All of the above
55. Kirchhoff’s law is applicable to
(a) AC circuits only (b) DC circuits only
(c) AC as well as DC circuits (d) passive network only
56. An ideal voltage source
(a) has terminal voltage proportion to current
(b) has terminal voltage in proportion to load
(c) has zero internal resistance
9. (d) has open circuit voltage nearly equal to the voltage on full load
57. Which of the following is bilateral element?
(a) constant voltage source (b) constant current source
(c) capacitance
58. A network which contain one or more than one source of emf is known as
(a) active network (b) passive network
(c) electric network (d) non-linear network
59. A coil with 1000 turns carrying a current of 8 amperes produces a flux of
6x10-8 Wb. The inductance of the coil will be
(a) 0.00075 H (b) 0.0075 H
(c) 0.075 H (d) 0.075 H
60. The inductance of a coil can be increased by
(a) increasing core length
(b) using core material of high relative permeability
(c) reducing number of turns
(d) any of the above
61. The inductive reactance of an ac circuit having 0.08 henry inductance at 60 Hz
frequency will be
(a) 10 (b) 20
(c) 25 (d) 30
62. An air gap provided in the iron core of an inductor prevents
(a) flux leakage (b) hysteresis loss
(c) core saturation (d) heat generation
63. A coil with 1000 turns carrying a current of 8 A produces a flux of 6 x 10-6Wb.
The inductance of the coil would be
(a) 0.75 H (b) 0.075 H
(c) 0.0075 H (d) 0.00075 H
10. 64. The inductance of a circuit is 16 henrys an a current of 6 amperes flows
through it. The energy stored will be
(a) 144 joules (b) 288 joules
(c) 556 joules (d) 1536 joules
65. An inductor stores energy in
(a) electrostatic field (b) electromagnetic field
(c) core (d) magnetic field
66. The current through an inductance follows
(a) a linear growth (b) a linear decay
(c) an exponential decay (d) an exponential growth
67. At t = 0+ with zero initial condition, which of the following acts as open
circuit?
(a) inductor (b) capacitor
(c) resistor (d) all of the above
68. With zero initial conditions an inductor at t - will act as
(a) open circuit (b) short circuit
(c) a source of voltage (d) a source of current
69. Power factor for a pure inductor is
(a) unity (b) zero
(c) infinite (d) 0.707
70. Which statement about the inductance is incorrect?
(a) The inductance of a coil can be increased by adding few more turns to the
coil
(b) The inductive reactance varies directly as the frequency of the applied
voltage
(c) Inductive reactance can be measured by an ohmmeter
(d) An inductance does not oppose direct currents
11. 71. At t = 0+ with zero initial condition which of hte flowing will act as short
circuit?
(a) Inductor (b) Capacitor
(c) Resistor (d) None of the above
72. With some initial change at t = 0+, a capacitor will act as
(a) a voltage source (b) a current source
(c) short circuit (d) open circuit
73. An ideal diode is
(a) current controlled resistor
(b) voltage controlled resistor
(c) neither current controlled nor voltage controlled resistor
(d) non-linear-time varying resistor
74. The super-position theorem is applicable to
(a) linear responses only
(b) linear and non-linear responses only
(c) linear, non-linear and time variant responses
75. The super-position theorem is applicable to
(a) current only (b) voltage only
(c) both current and voltage (d) current, voltage and power
76. A star circuit has each element of resistance R/2. The equivalent delta
elements will be
(a) R (b) 3R
(c) 3/2 R (d) R/6
77. A delta circuit has each element of value R/2. The equivalent elements of star
circuit will be
(a) 2R (b) 6R
(c) 3/2 R (d) R/6
12. 78. In case of delta connected circuit, when one resistor is open, power will be
(a) zero (b) reduced to 1/3
(c) reduced by 1/3 (d) unaltered
79. For three phase star connected circuit,
(a) Line voltage = phase voltage (b) Line current= phase current
(c) Line current = 3 phase current (d) None of the above is true
80. Which of the following is true for a three phase delta connected circuit
(a) Line voltage = phase voltage (b) Line current= phase current
(c) Line current = 1/3 phase voltage(d) Line current = 3 phase current
81. In three phase star connections, line voltage is the same as
(a) phase voltage (b) 1/3 phase voltage
(c) 3 phase voltage (d) 3 phase current
82. Application of Norton’s theorem to a circuit yields
(a) equivalent current source (b) equivalent impedance
(c) equivalent current source and impedance in series
(d) equivalent current source and impedance in parallel
83. S is the Laplace transform of
(a) (l) (b) unit step function
(c) unit doublet (d) unit impulse function
84. A unit ramp function when integrated yields
(a) unit parabolic (b) unit ramp function
(c) unit doublet (d) unit impulse function