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.
ALTERNATION
AND SYNCHRONOUS MOTORS: 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.
THREE-PHASE
INDUCTION 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.
SINGLE-PHASE
INDUCTION MOTORS AND COMMUTATOR 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.
II.
POWER GENERATION AND SWITCHGEAR AND PROTECTION:
HYDRO-POWER
PLANTS: 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.
THERMAL
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.
NUCLEAR
PLANT: Schematic arrangement and functions of different
components in nuclear power reactor.
COMBINED
OPERATION OF POWER PLANTS AND ECONOMIC ASPECTS: 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.
PROTECTIVE
RELAYING:
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.
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.
TRANSMISSION
LINE PARAMETERS: Determination of inductance and
capacitance of round and parallel conductors in single phase and three-phase
symmetrically spaced lines.
PERFORMANCE
OF LINES:
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.
INSULATORS
AND SUBSTATIONS: 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.
CABLE
AND DISTRIBUTION SYSTEMS: 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.
IV. MEASURING INSTRUMENTS AND ELECTRIC CIRCUITS:
MEASURING
INSTRUMENTS:
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.
ELECTRIC
CIRCUITS: 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.
V.
UTILIZATION OF ELECTRICAL ENERGY:
ELECTRIC
DRIVES: Factors
governing selection of motors; matching of motors with given loads; electric
braking; rating of motor; types of enclosures; motors for particular drive.
ILLUMINATION: 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.
ELECTRIC
HEATING AND WELDING:
Requirements of good heating materials, materials generally employed,
resistance heating; electric furnace; induction heating; dielectric heating
welding generator and transformers.
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
