Maharashtra HSC Electrical Maintenance (Bifocal) study plan

Define voltage, current, resistance, power and energy and compute each from the other using Ohm's law and the power equation across 20 mixed numericals

Apply series, parallel and series-parallel reduction to find equivalent resistance, branch current and voltage drop in at least 15 circuits

State Faraday's and Lenz's laws and explain how changing flux produces EMF and force on a conductor in qualitative terms

Draw and label the magnetic field patterns of a bar magnet, a current-carrying straight conductor and a solenoid

Solve AC single-phase problems for RMS, average, peak, frequency, power factor and impedance in R, L and C circuits

Explain the construction and working principle of a single-phase transformer and derive the EMF equation from turns and flux

Compute transformer turns ratio, secondary current, efficiency at full and part load, and regulation from given test data

Distinguish core and shell construction, list the purpose of conservator, breather, Buchholz relay and tap changer

Describe the rotating magnetic field in a three-phase induction motor and define synchronous speed, slip and rotor frequency

Calculate slip, torque-related speed values and starting current ratio for given induction motor nameplate data

Compare DC shunt, series and compound motor characteristics and state where each is applied industrially

Explain the need for a starter in a DC motor and describe the three-point and four-point starter circuits with their protective functions

Identify conductor materials, insulation types, voltage grades and current ratings for PVC, XLPE and flexible cables

Select cable cross-section for a given load current using derating factors for ambient temperature, grouping and installation method

Describe conduit, casing-capping, cleat and batten wiring with the accessories used in each, and list IS code colour conventions for conductors

Build a preventive maintenance checklist for a transformer, an induction motor and a distribution board with frequency and acceptance limits

Diagnose ten described faults such as motor humming without starting, single phasing, earth leakage and blown fuse, and state the test and remedy for each

Explain the operation, rating and selection of MCB, MCCB, ELCB and RCCB, and distinguish their tripping characteristics

Describe contactor, relay, thermal overload relay and push-button control and read a simple DOL starter circuit diagram

Interpret fuse and MCB discrimination and state why backup protection must be coordinated

Perform insulation resistance measurement procedure with a megger on a motor winding and cable, and state minimum acceptable values

Explain earthing types (plate, pipe, rod) and compute earth electrode resistance requirements and test procedure

State the key provisions of the Indian Electricity Rules relating to earthing, clearance, inspection and safety of consumers' installations

Apply shock protection principles, including touch and step potential, and describe first aid and CPR sequence for electric shock

List PPE and permit-to-work requirements before working on an isolated circuit and describe lockout-tagout steps

Describe star-delta and auto-transformer starting of induction motors and state the current and torque reduction in each

Explain variable frequency drive working principle, V/f control, and the effect of frequency change on motor speed and torque

Describe soft starter operation and contrast it with DOL and star-delta starting for given load types

Identify the role of PLC inputs, outputs and ladder logic rungs in a simple motor start-stop interlock application

Explain proximity sensor, limit switch and contactor-based interlocking in an industrial control panel

Select and use ammeter, voltmeter, wattmeter, energy meter, multimeter, megger and earth tester for stated measurement tasks

Connect a two-wattmeter circuit for three-phase power measurement and compute total power from the two readings

Explain the working of a single-phase energy meter and compute energy consumption and billing for given load and hours

Prepare a load schedule and estimate quantity of cable, conduit, switches and boards for a small workshop installation

Apply test procedures for polarity, continuity, earth loop and insulation resistance and record readings correctly

Demonstrate safe workshop practice for soldering, wire stripping, crimping and termination of conductors to terminals

Practice armature and commutator inspection, brush replacement and bearing lubrication steps on a DC machine

Rehearse the full troubleshooting sequence from symptom to isolation, test, repair and re-commissioning on a simulated fault

Revise all nine domains using a timed 60-question mock test and analyse wrong answers by domain

Consolidate weak areas by re-solving numericals from the two lowest-scoring domains