APTRANSCO SUB ENGINEER EXAM 2014 SYLLABUS
& MODEL PAPER Andhra Pradesh Transmission Corporation Limited (APTRANSCO) is
going to conduct examination for recruitment of Sub Engineers
in Visakapatnam Zone, Vijayawada Zone, Kadapa Zone, Hyderabad Metro Zone,
Hyderabad Rural Zone
& Warangal Zone. The notification
issued also contains the syllabus for the exam for sub engineers. Same is
reproduced as hereinbelow :

I.

**:**__ELECTRICAL MACHINES__**D.C. GENERATORS And MOTORS**: Expression for emf equation of D.C.Generaor, armature windings, armature reaction, types of generators, characteristics. Torque equation of D.C.Motor, characteristics, speed control, starters, losses and efficiency. Testing of D.C. Machines. TRANSFORMERS: emf equation of single phase transformer, operation of transformer on load, equivalent circuit, vector diagram, open-circuit and short-circuit tests, voltage regulation, losses and efficiency, all-day efficiency, parallel operation of single-phase transformers with equal voltage ratios. Voltage and current relations for three-phase transformer connections. Principle of operation of auto-transformer. Cooling of power transformer, Operation of Buchhloz’s relay.**: Salient-pole and cylindrical rotor types of construction. Alternator EMF equation and windings, armature reaction, voltage regulation using synchronous impedance, open-circuit and short-circuit tests, voltage variation against load currents at different power factors, parallel operation of alternators; synchronization by lamps method and synchroscope. Synchronous motors: Starting methods, effect of change of excitation at constant load, V-curves, Hunting, synchronous condensor.**

*ALTERNATION AND SYNCHRONOUS MOTORS***Constructional aspects of cage and wound rotor types of induction motors, expression for torque, torque-ship characteristics, full load torque, starting torque and maximum torque, effects of variation of rotor resistance; losses and efficiency; different starting methods; speed control methods.**

*THREE-PHASE INDUCTION MOTORS:***Constructional features and operation of single-phase induction motors: split phase, capacitor and shaded pole types. Principle of operation of A.C. series motor, universal motor, Schrage motor.**

*SINGLE-PHASE INDUCTION MOTORS AND COMMUTATOR MOTORS:*

__II. POWER GENERATION AND SWITCHGEAR AND PROTECTION:__**: Functions of different components of Hydel stations, water power equation, surge tank, choice of turbines, storage and pondage; base load and peak load operation, pumped storage plant.**

*HYDRO-POWER PLANTS***Plant line diagram and functions of different components of coal-fired steam power plant; boilers, steam turbines, condensers, superheater, economizer, cooling towers, chimney.**

*THERMAL POWER PLANTS:***Schematic arrangement and functions of different components in nuclear power reactor.**

*NUCLEAR PLANT:***Advantage of combined operation of Hydel and Thermal power plants; Load and Load duration curves, load factor, diversity factor and deman factor, capacity factor; types of tariffs, factors influencing tariff design. FAULTS AND SWITCHING APPARATUS: Short-circuit calculations; fuses and isolators; circuit breakers: theory of arc interruption and different types of oil circuit breakers; lightning arresters and their selection and location.**

*COMBINED OPERATION OF POWER PLANTS AND ECONOMIC ASPECTS:***: Basic requirements of protective relaying, primary and back-up protection; classification of electromagnetic relays and their principles of operation; time current characteristic curves; induction type over-current relay, distance relays; Merz price protection, differential protection of transformers, bus bar protection.**

*PROTECTIVE RELAYING*

__III. TRANSMISSION AND DISTRIBUTION:__

*LINE CONDUCTORS, LINE SUPPORTS AND SAG CALCULATIONS:*
Different
types of line conductors, conductor sizes commonly used for different voltage levels,
Types of line supports, factors influencing the selection, cross-arms; spans, conductor
spacings and ground clearances. Sag calculations and stringing charts.

**Determination of inductance and capacitance of round and parallel conductors in single phase and three-phase symmetrically spaced lines.**

*TRANSMISSION LINE PARAMETERS:***: Choice of voltage; short, medium and long lines; calculation of sending-end voltage, regulation and efficiency for short lines; nominal ∏ and nominal-T methods; Ferranti effect; corona: critical voltages and factors affecting corona.**

*PERFORMANCE OF LINES***Different types of insulators: Pin type, strain type, suspension type and relative merits; voltage distribution across string of suspension insulators, string efficiency and methods of improving arcing horns. Equipment used in substations, bus-bar arrangements.**

*INSULATORS AND SUBSTATIONS:***: Comparison between overhead lines and under ground cable. Types of cables, insulation resistance; localization of cable faults. Primary and secondary distribution; Feeders and service mains; radial and ring systems of distribution; singlephase a.c. distribution.**

*CABLE AND DISTRIBUTION SYSTEMS*

__IV. MEASURING INSTRUMENTS AND ELECTRIC CIRCUITS:__**: Indicating instruments: deflecting, controlling and damping torques, pointers and scales; ammeters and voltmeters: moving coil, moving iron, dynamometer, induction types; instrument transformers: C.T and P.T., Wattmeters and measurement of power in three phase systems by two-wattmeter method; measurement of energy: Energy meters; M.D. indicators; trivector meter.**

*MEASURING INSTRUMENTS***Fundamentals of alternating current quantities, sinusoidal waveform; average and effective values; J-notation for A.C quantities; polar form; single phase series and parallel circuits; impedance triangle, phase, power factor, active and reactive components of power; series and parallel resonance. Three-phase star and delta balanced systems.**

*ELECTRIC CIRCUITS:*

__V. UTILIZATION OF ELECTRICAL ENERGY:__**: Factors governing selection of motors; matching of motors with given loads; electric braking; rating of motor; types of enclosures; motors for particular drive.**

*ELECTRIC DRIVES***Definitions of commonly used terms and units; types of lamps; requirement of good lighting; laws of illumination; terms like : depreciation factor, utilization factor, waste light factor, luminous efficiency, specific energy consumption, space height ratio.**

*ILLUMINATION:***: Requirements of good heating materials, materials generally employed, resistance heating; electric furnace; induction heating; dielectric heating welding generator and transformers.**

*ELECTRIC HEATING AND WELDING*

__MODEL QUESTIONS__
For
each of the multiple choice type questions given below blacken the oval corresponding
to the correct answer in the O M R Sheet.

1.
The form factor for sinusoidal waveform is 1) 1.00 2)
1.11 3) 1.732
4) 2.2

2.
The rotor resistance and reactance of a three-phase induction motor is 0.2 ohm and
2 ohm respectively. The per unit slip
corresponding to maximum torque is equal to 1)
9.02 2) 0.01 3)
0.1 4) 0.2

3. Load factor is defined as the ratio of 1)
Average power demand to maximum power deamand

2)
Minimum power demand to maximum power deamand 3) Maximum power demand to
minimum power deamand 4) Average power demand to minimum power deamand 4. The
unit of luminous flux is

1) lux 2)
candle power 3) metre cancle 4)
lumen 5. For 132 KV transmission line, the insulators commonly used are 1) Strain type
2) Pint type 3)
Suspension type 4) Shackle type.

SEE ORIGINAL RECRUITMENT NOTIFICATION : http://aptransco.cgg.gov.in/Documents/SE.pdf