Syllabus: Assistant Electrical Inspector in Kerala Electrical Inspectorate

Detailed Syllabus for Assistant Electrical Inspector in Electrical Inspectorate

(Category No. 132/2020)

Electric Circuits

• Kirchoff’s laws – maximum power transfer theorem. Star/delta transformation. Energy stored in a capacitor and inductor.

• Analysis of coupled circuits – dot polarity convention – sinusoidal steady state analysis of coupled circuits.

• Generation of alternating voltages and currents – rms value, average value, peak factor, form factor.

• AC through series R, L, C circuit – series resonance- resonant power – bandwidth. Resonance in parallel circuits.

Magnetic Circuits- Absolute and relative permeability of a medium

• Magnetic field strength– magnetic potential. Relation between magnetism and electricity – Series and parallel magnetic circuits with composite materials.

• Faraday’s laws of electromagnetic induction– Lenz’s law – statically and dynamically induced emf.

DC Generators

• Constructional details, working principle – types of dc generators – emf equation – power stages – condition for maximum efficiency.

• DC motor – armature control and field control. Single phase transformer – working principle, equivalent circuit, losses in a transformer, condition for maximum efficiency.

• Three phase transformer – construction- difference between power transformer and distribution transformer.

• Alternators– constructional details –Synchronous motor – starting methods – synchronous condenser.

• Three phase induction motor – working principle, constructional details – slip, torque and current equations – torque- speed curve.

Digital Electronics

• Number Systems and Codes: Binary, Octal and hexadecimal conversions- ASCII code, Excess -3 code, Gray code.

• Combinational circuits – Adders – Full adder and half adder. Multiplexers- Demultiplexers. Flipflops – registers – counters. Digital – to – Analogue and Analogue-to-Digital conversion.

• Microprocessors – Internal architecture of 8085 microprocessor–Functional block diagram Instruction set – Addressing modes – Classification of instructions – Status flags. Machine cycles and T states – Fetch and execute cycles- Timing diagram.

Power Systems

• Line parameters -resistance- inductance and capacitance. Insulators –string efficiency corona.

• Circuit breakers – rating- SF6 circuit breaker. Relays – types. Per unit quantities- symmetrical components – symmetrical and unsymmetrical fault.

• Power system stability – steady state, dynamic and transient stability-power angle curve.

Control Systems

• Transfer function of LTI systems – block diagram reduction – Signal flow graph – Mason’s gain formula – Type and Order of the systems-

• Characteristic equation Time domain specifications of transient and steady state responses- Impulse and Step responses of first order and second order systems.

• Static error coefficients of type 0,1,2 systems. Routh’s stability criterion. Frequency domain specifications.

• Polar plot and Bode plot – concepts of gain margin and phase margin- stability analysis.

Power Electronics

• SCR– Structure, Static characteristics. Fully controlled and half controlled bridge rectifier with R, RL and RLE loads.

• Voltage Source Inverters– 1-phase half-bridge & full bridge inverter with R and RL loads – Pulse width modulation. Single quadrant, Two quadrant and Four quadrant chopper.

• Operational Amplifiers – fundamental differential amplifier- Modes of operation. Properties of ideal and practical Op-amp – gain, CMRR and slew rate.

Measurements and Instrumentation

• Measurement standards – errors – Types of Errors. Classification of instruments, secondary instruments–indicating, integrating and recording.

• Ammeters and voltmeters – moving coil, moving iron.

• Measurement of power: Dynamometer type wattmeter –Construction and working – 3- phase power measurement.

• Measurement of energy – Single phase energy meter – construction and working.

• Digital Energy meters -Time of Day(TOD) meters. Oscilloscopes- principle of operation of general purpose CRO-basics of vertical and horizontal deflection system.

Signals and Systems

• Classification of signals – Elementary signals- Basic operations on continuous time and discrete time signals.

• Concept of systems – Classification of systems- Properties of systems – Time invariance- Linearity -Causality – Memory – Stability.

• Sampling process – Impulse train sampling – sampling theorem- Aliasing effect. Zero order and First order hold circuits.

Transducers

• General classification– LVDT- angular displacement transducers- hall effect transducers.

• Batteries – Primary cells– secondary cells- battery ratings- grouping of cells.

• Wiring – systems of wiring- rules for domestic wiring. Earthing- types of earthing – rules for earthing.

• Illumination – Laws of illumination. Electric lamps – different types.

For Complete Syllabus;

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