Syllabus : Electrical Engineering Paper 2 (Engineering Service Examination)

PAPER – II

1. Analog and Digital Electronics:

• Operational amplifiers – characteristics and applications, 
• Combinational and Sequential logic circuits,
• Multiplexers, 
• Multi-vibrators, 
• Sample and hold circuits, 
• A/D and D/A converters, 
• Basics of filter circuits and applications, simple active filters; 
• Microprocessor basics- interfaces and applications,
• Basics of linear integrated circuits; 
• Analog communication basics, 
• Modulation and demodulation,
• Noise and bandwidth, 
• Transmitters and receivers, 
• Signal to noise ratio, 
• Digital communication basics, 
• Sampling, 
• Quantizing, 
• Coding, 
• Frequency and time domain multiplexing, 
• Power line carrier communication systems.

2. Systems and Signal Processing :

• Representation of continuous and discrete-time signals, 
• Shifting and scaling operations, 
• Linear, time-invariant and causal systems, 
• Fourier series representation of continuous periodic signals, 
• Sampling theorem, 
• Fourier and Laplace transforms, 
• Z transforms, 
• Discrete Fourier transform, 
• FFT, 
• Linear convolution, 
• Discrete cosine transform, 
• FIR filter, 
• IIR filter, 
• bilinear transformation.

3. Control Systems:

• Principles of feedback, 
• Transfer function, 
• Block diagrams and signal flow graphs, 
• Steady-state errors, 
• Transforms and their applications; 
• Routh-hurwitz criterion, 
• Nyquist techniques, 
• Bode plots, 
• Root loci, 
• Lag, lead and lead-lag compensation, 
• Stability analysis, 
• Transient and frequency response analysis, 
• State space model, state transition matrix, controllability and observability, linear state variable feedback, 
• PID and industrial controllers.

4. Electrical Machines :

• Single phase transformers, 
• Three phase transformers - connections, parallel operation, 
• Auto-transformer, 
• Energy conversion principles, 
• DC machines - types, windings, generator characteristics, armature reaction and commutation, starting and speed control of motors, 
• Induction motors - principles, types, performance characteristics, starting and speed control, 
• Synchronous machines - performance, regulation, parallel operation of generators, motor starting, characteristics and applications, 
• Servo and Stepper motors.

5. Power Systems :

• Basic power generation concepts, 
• Steam, gas and water turbines, 
• Transmission line models and performance, 
• Cable performance, 
• Insulation, 
• Corona and radio interference, 
• Power factor correction, 
• Symmetrical components, fault analysis, 
• Principles of protection systems, 
• Basics of solid state relays and digital protection;
• Circuit breakers, 
• Radial and ring-main distribution systems,
• Matrix representation of power systems, 
• Load flow analysis, 
• Voltage control and economic operation, 
• System stability concepts, 
• Swing curves and equal area criterion. 
• HVDC transmission and FACTS concepts, 
• Concepts of power system dynamics, 
• Distributed generation, 
• Solar and wind power, 
• Smart grid concepts, 
• Environmental implications, 
• Fundamentals of power economics.

6. Power Electronics and Drives :

• Semiconductor power diodes, 
• Transistors, 
• Thyristors, 
• Triacs, 
• GTOs, 
• MOSFETs and IGBTs - static characteristics and principles of operation, triggering circuits, 
• Phase control rectifiers, 
• Bridge converters - fully controlled and half controlled, 
• Principles of choppers and inverters, 
• Basic concepts of adjustable speed dc and ac drives, 
• DC-DC switched mode converters, 
• DC-AC switched mode converters, 
• Resonant converters, 
• High frequency inductors and transformers, 
• Power supplies.

Syllabus : Electrical Engineering Paper 1 (Engineering Service Examination)

PAPER – I

1. Engineering Mathematics

Matrix theory, Eigen values & Eigen vectors, system of linear equations, Numerical methods for solution of non-linear algebraic equations and differential equations, integral calculus, partial derivatives, maxima and minima, Line, Surface and Volume Integrals. Fourier series, linear, nonlinear and partial differential equations, initial and boundary value problems, complex variables, Taylor’s and Laurent’s series, residue theorem, probability and statistics fundamentals, Sampling theorem, random variables, Normal and Poisson distributions, correlation and regression analysis.

2. Electrical Materials

Electrical Engineering Materials, crystal structures and defects, ceramic materials, insulating materials, magnetic materials – basics, properties and applications; ferrities, ferro-magnetic materials and components; basics of solid state physics, conductors; Photo-conductivity; Basics of Nano materials and Superconductors.

3. Electric Circuits and Fields

Circuit elements, network graph, KCL, KVL, Node and Mesh analysis, ideal current and voltage sources, Thevenin’s, Norton’s, Superposition and Maximum Power Transfer theorems, transient response of DC and AC networks, Sinusoidal steady state analysis, basic filter concepts, two-port networks, three phase circuits, Magnetically coupled circuits, Gauss Theorem, electric field and potential due to point, line, plane and spherical charge distributions, Ampere’s and Biot-Savart’s laws; inductance, dielectrics, capacitance; Maxwell’s equations.

4. Electrical and Electronic Measurements:

Principles of measurement, accuracy, precision and standards; Bridges and potentiometers; moving coil, moving iron, dynamometer and induction type instruments, measurement of voltage, current, power, energy and power factor, instrument transformers, digital voltmeters and multi-meters, phase, time and frequency measurement, Q-meters, oscilloscopes, potentiometric recorders, error analysis, Basics of sensors, Transducers, basics of data acquisition systems

5. Computer Fundamentals:

Number systems, Boolean algebra, arithmetic functions, Basic Architecture, Central Processing Unit, I/O and Memory Organisation; peripheral devices, data represenation and programming, basics of Operating system and networking, virtual memory, file systems; Elements of programming languages, typical examples.

6. Basic Electronics Engineering:

Basics of Semiconductor diodes and transistors and characteristics, Junction and field effect transistors (BJT, FET and MOSFETS), different types of transistor amplifiers, equivalent circuits and frequency response; oscillators and other circuits, feedback amplifiers.

Syllabus : General Studies and Engineering Aptitude (Stage I - Paper I, Objective type, Common to all Candidates, 2 hours duration, 200 Marks maximum)

The questions from the following Topics will be set in Paper-I of Stage-I

1. Current issues of national and international importance relating to social, economic and industrial development

2. Engineering Aptitude covering Logical reasoning and Analytical ability

3. Engineering Mathematics and Numerical Analysis

4. General Principles of Design, Drawing, Importance of Safety

5. Standards and Quality practices in production, construction, maintenance and services

6. Basics of Energy and Environment : Conservation, environmental pollution and degradation, Climate Change, Environmental impact assessment

7. Basics of Project Management

8. Basics of Material Science and Engineering

9. Information and Communication Technologies (ICT) based tools and their applications in Engineering such as networking, e-governance and technology based education.

10. Ethics and values in Engineering profession

A synchronous generator is rated at 10MVA, 11kV, 0.85 p.f., 50Hz. What is the significance of 0.85 p.f.?

A)Load of p.f. more than 0.85 cannot be met
B)The prime-mover power rating is 8.5 MW 
C)It does not have any significance
D)Load of p.f. less than 0.85 cannot be met

Which one of the following equipment can open or close electrical circuits under both normal and abnormal conditions?

A)Fuse
B)Relay 
C)Circuit Breaker 
D)Isolator

A unity feed back closed loop system has open loop transfer function G(s)=K/{s(s^2+8s+25)}. At some value of K the system becomes oscillatory. What will be the values of K and frequency of oscillation?

A)150, 5 rad/sec 
B)200, 10 rad/sec 
C)200, 5 rad/sec 
D)150, 10 rad/sec

If the effect of earth is taken into account, then the capacitance of line to ground

A)Remains unaltered 
B)Increases 
C)Decreases
D)Becomes infinite

If P1 and P2 be the iron and copper losses of a transformer on full-load, then the ratio of P1 and P2, such that maximum efficiency occurs at 25% of the full-load, will be

A)1/4
B)1/64
C)1/16
D)1/2

The apparent power and active or real power are equal when the power factor (pf) is

A)0.5 leading 
B)0.5 lagging
C)zero 
D)unity

The power input to a three phase induction motor is 50kW and the corresponding stator losses are 2kW. The rotor is rotating at a slip of 3%.What will be the total rotor copper loss?

A)48 kW
B)45.46 kW
C)46.56 kW
D)1.44 kW

An SCR having equivalent capacitance of the reverse biased junction as 50 picoFarad, can be fired with a dv/dt of 200V/microsec. What will be the value of capacitive current flowing through the junction?

A)5 mA
B)1 mA 
C)20 mA 
D)10 mA

What is the effect of an integral controller on the type and order of the system?

A)Increases the type by one and increases the order by one
B)Decreases the type by one and increases the order by one
C)Decreases the type by one and decreases the order by one
D)Increases the type by one and decreases the order by one

The fault which occurs rarely in practice and is the most severe and imposes more heavy duty on the circuit breaker is

A)Line to line fault
B)Single line to ground fault 
C)Symmetrical fault 
D)Double line to ground fault

The temperature independent polarization is

A)Orientation polarization 
B)Space discharge polarization
C)Electronic polarization
D)Space charge polarization

What should be the address bus width to address 4kB memory?

A)4
B)12
C)16
D)8

If the gain of a transfer function is increased then the

A)Phase crossover frequency is decreased 
B)Gain crossover frequency is decreased 
C)Phase crossover frequency is increased 
D)Gain crossover frequency is increased

A negative feedback of β=0.002 is applied to an amplifier of gain 1000, then the percentage change in overall gain of the feedback amplifier if the internal amplifier is subjected to a gain reduction of 15% will be approximately

A)7.6% 
B)2.6%
C)5.6% 
D)9.6%

The insulators used in guy cables are

A)Stay insulators
B)Shackle insulators
C)Disc insulators
D)Pin insulators

If I(s)=(s^2+8s+8)/(s^2+4s), what will be the steady state component of i(t)?

A)1
B)2
C)4
D)8

A derivative controller

A)Improves transient stability
B)Improves steady state stability
C)Improves both the steady state and transient stability
D)Does not affect system stability 

Under force-voltage analogy, viscous friction co-efficient is analogous to

A)Reciprocal of inductance 
B)Charge 
C)Resistance
D)Reciprocal of capacitance

AC series motors are built with as few field turns as possible to reduce

A)Flux
B)Eddy current losses
C)Field reactance 
D)Speed

The displaced atom in Frenkel’s defect is called as

A)Anion 
B)Cation 
C)Hole
D)Real atom

The armature reaction of a synchronous generator under short-circuit condition is

A)Both demagnetising and cross-magnetising
B)Magnetising 
C)Cross-magnetising
D)Demagnetising

A vibration galvanometer is tuned

A)by changing its damping constant
B)by attaching weight to the vibrating coil 
C)by changing length and tension of vibrating coil
D)by changing its damping factor

Thermal relays are commonly used in

A)Generator protection
B)Motor starters
C)Transformer protection 
D)Feeder protection

Which one of the following alphanumeric code is used on punched paper cards?

A)8-bit EBCDIC 
B)7-bit Selectric 
C)7-bit BCDIC
D)12-bit Hollerith

In DMA operation, data transfer takes place between

A)Different CPUs 
B)I/O and memory
C)I/O and CPU 
D)Memory and CPU

For the polynomial P(s)=s^5+s^4+2s^3+2s^2+3s+15, the number of roots which lie in the right half of the s-plane is

A)1
B)4
C)2
D)3

In a transmission line there is a flow of zero sequence current when

A)Double line to ground fault
B)Line to line fault
C)Three phase fault 
D)There is an occurrence of over voltage on line due to a charged cloud

For circulating current mode operation of dual converter

A)2nd bridge is gated after a small time interval of the 1st one is gated
B)Only one bridge is gated at a time 
C)1st bridge is turned off before the 2nd bridge is gated
D)Both the bridges are gated simultaneously 

The instruction queue in 8086 CPU is

A)Of random access type 
B)Of FIFO type
C)Of infinite queue
D)Of LIFO type

A very effective logic circuit can be realized by constructing an n-channel and a p-channel MOS transistor on the same substrate. The configuration is known as

A)Supplementary FET
B)Complementary MOSFET 
C)Supplementary MOSFET 
D)Complementary FET

Johnson noise is

A)caused by thermal agitation of free electrons carrying current 
B)shot noise which results from random emission of electrons across a p-n junction
C)noise of an electromagnetic origin that is radiated into the circuit
D)noise carried into the circuit through conductors

A thermocouple has a sensitivity of 500 μV/°C. It is employed to measure a temperature of a furnace at 700 °C with reference junction at 50 °C. The voltage output of the thermocouple is / थर्ोकपल esa 500 μV/°C

A)750 mV
B)650 mV
C)375 mV
D)325 mV

A program counter is a storage register for

A)Location of instruction in memory
B)Binary code for the operation to be performed
C)Location of data in memory
D)Address of next instruction to be executed

In a chopper circuit, the switching device is turned off at regular intervals by adopting

A)A combination of forced and natural commutation 
B)Forced commutation 
C)Either forced or natural commutation
D)Natural commutation

The positive swing of the output signal in a transistor circuit starts clipping when Q-point of the circuit moves towards the

A)Centre of the load line 
B)Centre of the supply lineS
C)Saturation point 
D)Cut-off point

If A = 5ax - 3ay + 5az and B = 3ax + ay then the magnitude of (2A - B) will be

A)18.07
B)10.07
C)22.07
D)14.07

The 8085 microprocessor responds to the presence of an interrupt

A)as soon as the TRAP pin becomes high 
B)by checking the TRAP pin for high status at the end of the execution of each instruction
C)by checking the TRAP pin for high status at regular intervals
D)by checking the TRAP pin for high status at the end of each instruction fetch

A full wave controlled rectifier with resistive load is supplied from 200 sin 100t (volts) mains. What will be the average output voltage if the SCRs are fired at 60 degree?

A)150V
B)300V
C)200V
D)95.5 V

Materials which are electrical insulators and in which an electric field can be sustained with a minimum dissipation of power can be named as

A)Magnetic materials 
B)Semi-conductors
C)Super conductors 
D)Dielectric materials 

The extremely high input impedance of a MOSFET is Primarily because of

(A) Absence of its channel
(B) Depletion of current carriers
(C) Extremely small leakage current of its gate capacitor
(D) Negative VGS

The crawling in an induction motor is caused by

(A) Improper design of the machine
(B) Low voltage supply.
(C) High loads.
(D) Harmonics developed in the motor.

The “Superposition theorem” is essentially based on the concept of

(A) duality.
(B) linearity.
 (C) reciprocity.
 (D) non-linearity.

The magnetizing current in a transformer is rich in

1. Third harmonics
2. Fifth harmonics
3. Seventh harmonics
4. Thirteen harmonics

An auto-transformer having a transformation ratio of 0.8 supplies a load of 3kW. The power transferred conductively from primary to secondary is

1. 0.6 kW
2. 2.4 kW
3. 1.5 kW
4. 0.27 kW

While performing the open-circuit and short-circuit tests on a transformer to determine its parameters the status of the low voltage (L.V) and high voltage (H.V) will be such that

1. In Open circuit L.V is open and in short circuit H.V is shorted
2. In Open circuit H.V is open and in short circuit L.V is shorted
3. In Open circuit L.V is open and in short circuit L.V is shorted
4. In Open circuit H.V is open and in short circuit H.V is shorted

If a sinusoidal voltage source is connected to a power transformer, its no-load current would be

1. Sinusoidal and lagging the voltage by ninety degrees
2. Sinusoidal and lagging the voltage by less than ninety degrees
3. Rich in third harmonic and its fundamental would lag the voltage by ninety degrees
4. Rich in third harmonic and its fundamental would lag the voltage less than ninety degrees

The utility of delta-connected tertiary windings in star-star connected power transformer is that it

1. Makes supply available for small loads
2. Provides low reactance paths for zero sequence currents
3. Is used to suppress harmonic voltages
4. All of these

A 200/100V, 50 Hz transformer is to be excited at 40 Hz from the 100V side. For the exciting current to remain the same, the applied voltage should be

1. 150 V
2. 125 V
3. 100 V
4. 80 V

A 2-phase, 4 pole permanent magnet stepper motor has a step of

1. 90 degrees
2. 45 degrees
3. 30 degrees
4. 22.5 degrees

Supply to one terminal of delta-star three-phase core type transformer which is on no-load fails. Assuming magnetic circuit symmetry, voltages on the secondary side will be

1. 230, 230,115
2. 230,115, 115
3. 345, 115, 115
4. 345, 0, 345

A 220/440 V, 50Hz, 5kVA single phase transformer operates on 220V, 40 Hz supply with secondary winding. Then

1. The eddy current loss and hysteresis loss of the transformer decrease
2. The eddy current loss and hysteresis loss of the transformer increase
3. The hysteresis loss of the transformer increases while eddy current loss remains the same
4. The hysteresis loss remains the same whereas eddy current loss decreases

The voltage regulation of a large transformer is mainly influenced by

1. No-load current and load power factor
2. Winding resistances and load power factor
3. Leakage fluxes and load power factor
4. Winding resistances and core losses

A 2500/250V, 25kVA transformer is connected as an auto transformer to give 2500/2750 V. Its rating would be

A)     250 kVA; 225 kVA is transformed conductively

B)      250 kVA; 225 kVA is transformed inductively

C)      275 kVA; 250 kVA is transformed inductively

D)     275 kVA; 250 kVA is transformed conductively

A single phase transformer is to be switched to the supply to have minimum inrush current. The switch should be closed at

A)     Maximum supply voltage

B)      Zero supply voltage

C)      1/1.414 maximum supply voltage

D)     0.5  times maximum supply voltage

Auto transformer is used in transmission and distribution

A)     When operator is not available

B)      When iron losses are to be reduced

C)      When efficiency considerations can be ignored

D)     When the transformer ratio is small

Keeping in view the requirement of parallel operation, which of the 3-phase connections given below are possible?

A)     Delta-delta and delta-star

B)      Delta-delta and star-delta

C)      Star-star to delta-delta

D)     Delta-star to star-delta

A 2/1 ratio, two winding transformer is connected as an auto transformer. Its KVA rating as an auto transformer compared to a two-winding transformer is

A)     Same

B)      1.5 times

C)      2 times

D)     3 times

On the two sides of a star/delta transformer

A)     Voltages and currents are both in phase

B)      Voltages and currents both differ in phase by 30⁰

C)      Voltages differ in phase by 30⁰ but currents are in phase

D)     Currents differ in phase by 30⁰ but voltages are in phase

The efficiency of transformer at full-load 0.85 pf lag is 95%. Its efficiency at full-load 0.85 pf lead will be

A)     Less than 95%

B)      More than 95%

C)      95%

D)     100%

In a transformer the phase angle between primary and secondary terminal voltage is

A)     90⁰; primary voltage leading the secondary voltage

B)      90⁰; primary voltage lagging the secondary voltage

C)      A few degrees, primary voltage leading the secondary voltage

D)     A few degrees, primary voltage lagging the secondary voltage

Transformer excited from a sinusoidal voltage source will draw a no-load current which

A)     Is sinusoidal and of the same frequency as the voltage source

B)      Comprises the fundamental frequency (same as that of the voltage source) and the peaking third harmonic

C)      Comprises the fundamental frequency and the depressing third harmonic

D)     Is sinusoidal of frequency three times that of the voltage source

A transformer on no-load is switched on to a source of voltage. It will draw a current which

A)     The same as the steady-state magnetizing current

B)      Several times the steady-state magnetizing current depending upon the initial state of the residual flux in the transformer core

C)      Several times the steady-state magnetizing current depending upon the initial state of the residual flux in the transformer core

D)     Twice the steady-state magnetizing current provided the core has no residual flux

For a fixed primary voltage how does the secondary terminal voltage of a transformer change if the power factor of inductive load is raised from 0.7 to 0.9 with load current remaining fixed?

A)     No change in voltage

B)      Voltage decreases

C)      Voltage rises

D)     Voltage will rise, go through  maximum and then decrease

For a fixed primary voltage how does the secondary terminal voltage of a transformer change if the power factor of capacitive load rises from 0.7 to 0.9 with load current remaining fixed?

A.      No change in voltage

B.      Voltage decreases

C.      Voltage rises

D.      Voltage will rise, go through  maximum and then decrease

The applied voltage of a certain transformer is increases by 50% while the frequency reduced to 50%. The maximum core flux density will be

A)      Becomes three times

B)      Becomes 1.5 times

C)      Becomes half

D)     Remains the same

Which of the following tests must be performed on a transformer to determine its leakage reactance

A)     SC test only

B)      OC test only

C)       Both OC and SC tests

D)     Test by an impedance bridge

Power input to a transformer on no load at rated voltage comprises predominantly

A)     Copper loss

B)      Hysteresis loss

C)      Core loss

D)     Eddy current loss

Hysteresis losses are directly proportional to the

A)     Square of frequency and flux density to the power 1.6

B)      Frequency and flux density to the power 1.6

C)      The square of frequency and proportional to the square of flux density

D)     Frequency and proportional to flux density

A coil wound on magnetic core is excited from an AC voltage source. The source voltage and its frequency are both doubled. The eddy current loss in the core will become

A)     Half

B)      Remains same

C)      Double

D)     Four times

Building steel core out of stampings reduces eddy current loss because it

A)     Increases core resistivity

B)      Increases the effective length of eddy currents paths thereby increasing effective resistance to the flow of eddy currents

C)      Increases core permeability

D)     Reduces the effective length of eddy current path, thereby reducing effective resistance to the flow of eddy currents.

A 200/100 V, 50 Hz transformer is to be excited at 40 Hz from 100V side. For the exciting current to remain the same, the applied voltage will be

A)     150 V

B)      125 V

C)      100 V

D)     80V

Which three phase connection can be used in a transformer to introduce a phase difference of 30 degree between its output and corresponding input line voltages?

1. Star-Star
2. Star- Delta
3. Delta-Delta
4. Delta-zigzag

Answer : Star - Delta

A single phase transformer when supplied from 220V, 50 Hz has eddy current loss of 50 W. If the transformer is connected to a voltage of 330V, 50 Hz, the eddy current loss will be

A)     168.75 W

B)      112.5 W

C)      75 W

D)     50 W

The power factor of a synchronous motor

A)     Improves with increase in excitation and may even become leading at high excitations

B)      Decreases with increase in excitation

C)      Is independent of its excitation

D)     Increases with loading for a given excitation