APGENCO-SUB ENGINEERS EXAM 2011 KEY PAPER

APGENCO-SUB ENGINEERS 2011 KEY PAPER

Demand factor=----------------------(MD/Connected load

Kaplan, francis, propeller turnbines are------------(Reaction turbines)

Efficiency of a thermal power station is------------(30%)

In india max power is supplied from---------------(Thermal power plants)

Water hammering effect developed in------------(penstock)

In an hydro electric power plant a conduit system for carrying water from intake to turbine is --------------(penstock)

Min fuel cost in power plants---------------(Hydel power plants)

governing mechanism is used to control the speed of -------------(turbine)

The pollution is less in which PS-----------(hydel)

More ash content in-----------------(Lignite)

The pollution due to TPS can be minimized by--------------(Electro static precipitator)

The energy conversion in centrifugal pumps--------

The energy used to generate hydel power is-----------(KE)

The process of burning nuclear fuel---------(Fission)

The height of the chimney depends on-----------

In a substation the LA is placed at-------------(bus bars)

PLCC------------(power line carrier communication)

The more losses in boiler due to--------------(flue gases)

The dangerous thing  in steam boiler is---------(loss of water in boiler)

The low level CB's used upto and including-----------(1100v)

The service voltage in power house----------------(230v)

LV relays are used for protecting---------------(motor, feeder,transformer)

Automatic supply interruption can be done when fault occurs by--------(CB)

In hollow conductors the effect of current is min at------(centre of the conductor)

In TPS type of cooling used for alternators-----------(hydrogen)

For 220kv cables the type insulation used------------(compressed oil/gas)

In a power plant a reverse generating capacity which is in service but its not operation is------------(cold reserve)

Voltages used for electrostatic precipitator-------(50kv-100kv DC)

coal is pulverized for------------(efficient burning)

classifier is used for-------------(separate the size of the pulverized particles)

Gates near the turbine-----------(wicket gates)

Boilers are purged----------(~before starting, before shutting)

The equipments in s/s are connected(earthing)----------

jet ash is because of -------------(mix of water with ash)

The power taking of three phase load--------(√3VIcosф)

Form factor--------------(rms value/avg value)

MMF is analogous to------(voltage)

Kirchoffs first law-----------(KCL)

VRLA batteries -------(Valve regulated lead acid)

200AH-------------(200A for one hour)

Mostly used batteries in the industry--------(Lead acid)

In direct arc furnace -----------is more(V,I, pf)

units of Illumination----------(lux)

The armature reaction first effects the-----------------(back emf per phase)

The thickness of material is reduced for reducing---------(eddy current loss)

constant speed motor------------(synchronous motor)

For starting of single phase IM the method is----------(auxiliary winding in stator)

Statically induced emf in-------------(transformers)

N1=1000,E1=250,E2=400, N2=_-----------------(1600)

DC series motors can,t be run on no load bcoz------------(high speed)

The max speed achieved by a 2 pole ,50hzalternator-------(3000rpm)

The no.of parallel paths required for a 2 pole duplex lap winding machine----(4)

The voltage equation for a dc motor------(Eb=V-IaRa)

The angle b/w rotating field flux and rotor---------(synchronizing angle)

An SCR is a------------(4-layer, 3terminal device)

In normal operation of a pnp transistor its junctions are biases--------(EB-forward,CB-reverse)

The voltage that is applied to diode when its reverse biased-------(PIV)

The min no.of diodes required for a fullwave rectifier-----------(2)

The input of rectifier is 230v, 50hz the o/p freq is-------(zero)

An ideal opamp---------(infinite i/p impedance, zero o/p impedance)

Photo transistor works on-------------(Light intensity)

A transistor amplifier with low efficiency------------(Class A)

By considering noise level which type of modulation is preferred--------(FM)

Modulation purpose is--------(enable efficient transmission over long distance)

DVM measures---------(rms value)

The time settings in CRO can be done by--------(x-axis)

The bidirectional operation of two SCRs connected back to back is---------(TRIAC)

SMPS uses---------(MOSFET)

Moving coil instruments are used to measure-----------(DC)

The speed of the motor can be measured by----------------(Tachometer)

Orifice meter is used for measuring-----------(flow)

Pressure measuring instrument--------

Temperature measuring instruments------------(thermocouple)

Megger is used for -----------(measuring insulation R)

The Otto cycle is a-------------(4-stroke engine)

In a petrol engine mixing of fuel and air occurs in-----------(carburetor)

How PLC connecting with PC--------(RS-232, RS-485, Ethernet )

Non volatile memory is--------(when power off memory will be lost)

EX-OR gate-------------(A'B+AB')

Healthy flame in which color------------------

ctrl+V----------(paste)

Tables can be created in(MS)-----------(MS word)

power point can be used to------------( presentation)

For purifying the water chlorine is used ---------(T/F)

EPABX------------------(electronics private automatic branch exchange)

Green cleaning is------(growing trend in favor of using cleaning methods)

IDA--------(Industrial development and regulations)

Height and size of the Lathes depends on----------

Basic characteristic to identify vibration---------(frequency, phase, acceleration)

Flame scanners are used for-------

CO 2  and mixed power are--------- type of fire extinguishers(class B)