technical quiz conducted at edc to group-iii executives
TRANSCRIPT
Compiled byCompiled by
M. M. MuraliMurali
MohanMohanDyDy. . SuptdSuptd
(O)(O)Dt: 25.01.2013
Information to membersInformation to members
No. of members
in a group is depends on total members present. However maximum will be ‘5’.
Since quiz is prepared on 4 parts, comprising of basic mechanical, Electrical, Stage –
I and
Stage –
II related questions,
it will be easy to it will be easy to grab more marksgrab more marks
if team is formed with
above background.
If anybody is other than Mech
/ Elec,
choice is left them.
•
The question will be displayed on screen.
1st
question is asked to Team ‘A’
and Team ‘A’
could
answer it within the given time of 30 sec,30 sec,
then Team ‘A’
will be getting 5
marks.
If team –
A could not answer within the time, answer will be displayed automaticallyautomatically
on screen.
Then next question will be posed to Team ‘B’
and same process continues. No negative Markings.
If any discussion / clarification is required for a particular question, it will be discussed after it will be discussed after completion of quiz.completion of quiz.
Technical Quiz -
Rules
MechanicalMechanical
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The quantity of heat required to raise the
temperature of 1 gr
of water by 1OC
is termed as
One CalorieOne Calorie
1
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The method of producing power by utilizing steam generated for process in the boiler is termed as
CogenerationCogeneration
2
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The minimum capacity of any closed vessel which generates
steam under Indian Boilers Regulation Act
is ?
22.75 liters22.75 liters
3
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The type of cooling towers with maximum heat
transfer between air to water is ___.
Mechanical DraftMechanical Draft
4
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The heat input required for generating ‘one’
kilo watt-
hour
of electrical output is called as ___.
Heat RateHeat Rate
5
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The agency to look after the climate changes and
for action to cut GHG ____
UNFCCCUNFCCC
6
United NationsUnited NationsFrameworkFramework
Convention onConvention onClimate ChangeClimate Change
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Ultimate analysis of fuel is determination of
percentage of what ?
Carbon, Hydrogen, Carbon, Hydrogen, Nitrogen, Sulphur and MoistureNitrogen, Sulphur and Moisture
7
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Which is the best suited pump for pumping the
furnace oil ?
Screw / gear pumpScrew / gear pump
8
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A rise in the conductivity of boiler feed water
indicates ?
Increase in level of dissolved Increase in level of dissolved solidssolids
9
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If the dry bulb temperature of air is 35oC
and the wet bulb
temperature is 35oC
what will be the relative humidity %.
100%100%
10
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Acid rain is caused by the release of which components from
combustion of fuels.
SOSOXX
and NOand NOXX
11
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The parameter used by ASME
to define fans,
blowers and compressors is____
Specific ratioSpecific ratio
12
ASME=American societyOf Mechanical Engineers
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Which type of control gives maximum benefits
for fan
application from energy saving point of view ?
Speed ControlSpeed Control
13
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Name the instrument used for the measurement of specific gravity of liquid
fuels
HydrometerHydrometer
14
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For complete combustion of every kg
of Fuel oil firing,
the approximate theoretical quantity of air required is
14 Kg14 Kg
15
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Oxygen (O2
) percentage measurement by volume
basis
can be done by using
Zirconium Oxide probeZirconium Oxide probe
16
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What is the impact on flow and pressure when
the impeller of a pump is trimmed ?
Both pressure and flow Both pressure and flow decreasesdecreases
17
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How much % of efficiency
of Boiler will be increased with Air pre heaters ?
8 8 ––
12%12%
18
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What type of “Thermo couple”
will be used to
measure furnace temperature ?
Pt Pt --
RhRh
(up to 1400 deg. C)(up to 1400 deg. C)––
Platinum Platinum --
RhodiumRhodium
19
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Type of bearingType of bearing
20
First digit
of a ball bearing number indicates
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OD of thread portionOD of thread portion
21
The number in M12
Bolt specification indicates
The number in M12 Bolt specification indicates
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BlowerBlower
22
The supply air at high volume and low pressure,
the equipment used is
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ViscosityViscosity
23
The Lube oil specification number indicates what
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Flexible couplingFlexible coupling
24
The type of coupling used in high vibration applications ?
302928272625242322212019181716151413121110987654321End
BraytonBrayton
cyclecycle
25
For the same heat input and the same maximum pressure,
the most efficient cycle is
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Coefficient of expansionCoefficient of expansion
26
A bimetal strip consists of two metal strips have
different
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KineticKinetic
27
The moving blades of impulse turbine convert the _______ energy of the steam jet into
torque on turbine shaft.
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Flow and static pressureFlow and static pressure
28
The choice of fan type for a given application
depends on _______
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Discharge of fluidsDischarge of fluids
29
A Rota meter is used to measure
---------?
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Pipes carrying steam from boiler to turbinePipes carrying steam from boiler to turbine
30
In a steam power plant which pipe line section is
invariably lagged ?
ELECTRICALELECTRICAL
The type of energy possessed by the charged
capacitor is
ElectrostaticElectrostatic
1
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The portion of apparent power
that doesn’t do any
work is termed as
Reactive PowerReactive Power
2
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What determines the thermal loading on the
motor ?
Duty / Load cycleDuty / Load cycle
3
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Presenting the load demand of a consumer
against time of the day is known as___.
Load curveLoad curve
4
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Core losses in transformer are caused
by ?
HysterisisHysterisis & Eddy current& Eddy current
5
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The voltage appearing across the contacts after
opening of the circuit breaker is called ?
Recovery VoltageRecovery Voltage
6
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Burden of a protective relay is the power………
Absorbed by the Absorbed by the circuit of relaycircuit of relay
7
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The size and construction of bushings in transformers
depend up on the
Voltage appliedVoltage applied
8
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If the excitation of synchronous generator
fails, it acts as
Induction GeneratorInduction Generator
9
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The color of silica gel crystal when saturated ?
Pink colorPink color
10
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What parameters need to be measured after
rewinding of a motor ?
Winding resistance,Winding resistance,Air gap & no load currentAir gap & no load current
11
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What is the minimum ground clearance is required for
400KV System ?
8840 mm as per IE8840 mm as per IE--19561956
12
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The function of lightning arrester in power system
is ?
To provide path to high To provide path to high Voltage surge to earthVoltage surge to earth
13
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A fuse wire should be of material that has____
resistivity and____ melting points.
High, LowHigh, Low
14
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In large alternators Damper winding
is
used to improve..........
StabilityStability
15
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When a generator is connected to infinite
bus-bars, its ........ and .......... are fixed.
Frequency and voltageFrequency and voltage
16
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The power factor of an alternator depends on
LoadLoad
17
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If the input to the prime mover of an alternator is kept
constant but the excitation is changed, then the
Reactive component of the Reactive component of the output is changed output is changed
18
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Between two supports, due to sag the conductor
takes the form of
CatenaryCatenary
19
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The bundling
of conductors is done
primarily to
Reduce reactanceReduce reactance
20
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Fusing factor for a HRC fuse is
Minimum fusing current / Current ratingMinimum fusing current / Current rating
21
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A relay used for protection of motors against overload is
Thermal relayThermal relay
22
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The symbol indicates
Lightning ArresterLightning Arrester
23
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Differential protection principle is used in the
protection of
Generators, Transformers & feedersGenerators, Transformers & feeders
24
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The maximum Horse Power up to which 440 V
electric motors are used, is
200 HP200 HP
25
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Which meter is installed at the premises of a consumer for
recovery of charges of electrical energy
KWh meterKWh meter
26
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In ACSR conductors, purpose of aluminium
and of steel is ---------------
& --------------
Carry current & provide strengthCarry current & provide strength
27
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An electric transmission line has four parameters namely resistance, inductance,
capacitance
and __________.
Shunt conductanceShunt conductance
28
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Long distance railways use ----------
rating and ---
-----------
type of supply
25KV25KV &
Single phase ACSingle phase AC
29
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In a substation the equipment used to limit
short circuit current level is
Series ReactorSeries Reactor
30
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Stage Stage –– II
1951 Kcal/1951 Kcal/KwhKwh
1
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What is the design heat rate of turbine of 200 MW unit of Ramagundam
in kcal/kwh?
0.8 0.8 KscKsc
2
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What is the lube oil pressure to get start permissive
for starting
BFP ?
640 mmHg640 mmHg
3
302928272625242322212019181716151413121110987654321End
At what vacuum, vacuum unloader
will act ?
Corresponding FD Fan trips afterCorresponding FD Fan trips after30 seconds30 seconds
4
302928272625242322212019181716151413121110987654321End
What will happen to FD fans if a running APH
trips ?
395 m395 m33
5
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What is the capacity of boiler for filling including
Reheater
?
60 %60 %
6
302928272625242322212019181716151413121110987654321End
At what % of steam flow RH protection will get
armed ?
40 %40 %
7
302928272625242322212019181716151413121110987654321End
Power load Unbalance acts when the difference between
mechanical and electrical power is more than ---------
1616thth
8
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Mechanical power of turbine is calculated from which stage of Turbine ?
1326 Amps 1326 Amps
9
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What is the maximum excitation current we can
raise ?
9 Nos. 9 Nos.
10
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How many spring loaded safety valves available in total for 200MW boiler ?
Drum = 3 Nos.SH = 2 Nos.RH Inlet = 2 Nos.RH Outlet = 2 Nos.
Stage –
II –
16 Nos.
Inlet vane minimum position.Bearing temperature normal.Scoop oil temp. normal / scoop oil pressure adequate.Emergency push button is in released condition.At least one APH should be in service.
11
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Can you specify at least 3 permissives to start ID Fan ?
12
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Minimum how much velocity of air flow is required to avoid coal
chokage
in coal pipes ?
18 m/sec. 18 m/sec.
13
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At 2.0 ksc
of H2
pressure we can run at full load but with 1.0 ksc
of pressure, how much maximum load can be maintained ?
180 MW 180 MW
14
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How many feeders in 400kV switchyard
are having Auto
Reclose provision ?
10 Nos. 10 Nos.
15
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How many sources are available for TG MCC –
B
?
1. From Unit Aux Switchgear sec 1. From Unit Aux Switchgear sec --
B (Normal)B (Normal)2. Tie from TG MCC 2. Tie from TG MCC ––
Sec Sec --
C. C.
16
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What is the MVA rating of Unit Transformer
with ONAN / ONAF ?
12.5 MVA / 16 MVA12.5 MVA / 16 MVA
17
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Can you name at least 5 Control valves,
which will be in stay put
when loss of Instrument Air ?
1.
Guns power cylinder2.
Igniter power cylinder3.
HFO Pressure CV4.
LFO Pressure CV5.
Igniter oil Pressure CV6.
Gas/ air dampers7.
Interconnection dampers8.
FD Fan IGV
9.
FRS remain as it is10. Seal air discharge damper11. PA IGV 12. Tampering air damper13. Deaerator
pressure CV14. ID Fan IGV15. FD discharge damper16. ID discharge damper
18
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What are the Deaerator
normal, low and low –
low
values ?
2600, 1000 and 480 mm2600, 1000 and 480 mm
19
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Can you specify at least three applications
of clarified water in
stage –
I Turbine / Generator
side ?
1)
Generator H2
Gas Coolers -
4 nos.2)
Seal oil coolers -
2 nos.3)
CEP A&B bearing cooling.4)
BFP –
A, B, C main pump seal water cooling.5)
BFP Booster pumps gland cooling.6)
Air washer Units.7)
Sampling table cooler & chiller.
20
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How many groups of cooling fans are provided for TT-1 & TT-2
and
what are the cut in
temperatures ?
8 Nos
/ 2 Groups. Group –
I cut in at 600C & Group –II at 700C
Stage Stage –– IIII
When the flue gas at inlet drops When the flue gas at inlet drops Below 100 Below 100 00CC
1
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When the APH can be stopped while unit is going for shut-down ?
+ 1 / + 1 / --
0.95 mm0.95 mm
2
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Main Turbine trips at what values of Axial shift (mm)
in 500mw unit ?
Control fluid pressure Control fluid pressure < 26 < 26 KscKsc
3
302928272625242322212019181716151413121110987654321End
When does the stand by control fluid pump starts in
auto ?
--
164 MVAR 164 MVAR
4
302928272625242322212019181716151413121110987654321End
As per generator capability curve, maximum permissible
MVAR in leading zone is ?
2 & 3 2 & 3
5
302928272625242322212019181716151413121110987654321End
How many disposal lines available for Fly ash and
bottom ash
in stage –II ASPH ?
1)
ACSOP -
1 not running and pump-2 discharge pressure is < 3.5 ksc.2)
ACSOP -
2 not running and pump-1 discharge pressure is < 3.5 ksc.
3)
Air side seal oil pump 1 & 2 are not running.4)
ΔP between air side seal oil and H2
goes down to 0.9 ksc.
6
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Specify the at least ‘3’
reasons for auto start of DC Seal oil
pump ?
OIL
7
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What is the arc extinguishing media in 132 Kv
breakers in
switchyard ?
No. of wheels : 2 (one positive & one negative)No. of Fuses per rectifier wheel : 30No. of diodes per rectifier wheel : 60.
8
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How many number of fuses
are provided in each rectifier wheel
of excitation system ?
30 Nos.
9
302928272625242322212019181716151413121110987654321End
What are the PW stator winding flow normal, alarm and
trip
values in dm3/Sec ?
16.6 / 15.0 / 13.3 dm3
/ sec
1 m3/hr = 3.6 x dm3/Sec
10
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Stage –
II compressors -
IAC – 1,2,3,4 Supply is taken from
which switchgear ?
6.6 KV Unit switchgear –
4B/5B/6B and 6.6KV Station switchgear –
3S1
11
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When control fluid fullers earth filter
will be exhausted and
change over is to be done?
Control fluid acidity exceeds 0.2 mg KOH /gm.
12
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Specify at least ‘3’
conditions, for which SGWC pump trips ?
Discharge valve -
1 not fully open.Discharge valve -
2 not fully open.
Motor cavity temperature high -
> 60oC.
13
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What are the normal and over load currents of PA Fan ?
130 to 140 Amp / 212 A
14
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Specify at least ‘3’
consequences after failure of UPS System ?
1)
Boiler trips on Loss of 110 VAC. 2)
Turbine trips on boiler trip.
3)
Hydrastep
indication will not be available.4)
All Annunciation windows will fail.
5)
All Analog controls will drive to zero.6)
PA system will not be available.
15
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Specify at least ‘2’
reasons for tripping of air compressor
?
1)
Lube oil pressure very low -
2.0 ksc2)
Air receiver pressure very high -
9.4 ksc
3)
Cooling water flow very low -
350 liters /min4)
Air temperature after intercooler very high - 52 °C
16
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What is function of Auxiliary start up oil in governing
system
?
Resetting of all protection devices
17
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Specify what are the reasons for appearing of “MOT
measurement fault/trip not in service”
alarm in UCB ?
1)
When 1/3 (out of three -100 level switches) acted. OR2)
When oil level < 0 (Zero level switch acted) & TG valve inclosed condition with 3m delay. OR
3) Trip memory not set.
18
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How many emitter and collector rappers
are provided in each pass of ESP
?
12 & 6
19
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What are the recommended MS pressure & temp.
for turbine
rolling during warm start up ?
60 Ksc
and 400 0C
20
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What are the mechanical protections are provided for
stage –
II turbine ?
1. Turbine over speed –
110%.2. Low vacuum –
(-0.69 Ksc).
3. Axial shift +1.0 mm / -0.95 mm
