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Categories >> Engineering >> Power-Plant-Engineering
 
 


 

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Question
I want to build 100 megawatt hydel dam. What does mean, 100
MW per hour? then how many electric bulb of 100 Watts the
dam would lit?
Rank Answer Posted By  
 Question Submitted By :: Ajmal
I also faced this Question!!   ALL Interview .com
Answer
No, it means we are giving 100MW input power to the alternator. We can lit 1000000 bulbs.
 
0
Saurabh Bhardwaj
 
 
Question
During shutdown of Steam Turbine,How do we cross the
critical speed?
Rank Answer Posted By  
 Question Submitted By :: Gooodlover
This Interview Question Asked @   OPG , Power Seaction
I also faced this Question!!   ALL Interview .com
Answer
Max speed at which turbine can rotate with load of maximum load
 
0
Sappy
 
 
Answer
As we closed esv after that speed of the turbine goes to
slow down automatically we can not any thing as it cross the
critical speed , for short time vibration increase but after
that goes slow down and turbine stop .Some turbine run above
the critical speed and some below the critical speed .
 
0
Chanchal Rajput
[NPTI]
 
 
 
Answer
As soon as steam stop valves are closed there is no control on coast down speed of turbine unless vacuum break valve of condenser is opened. Normally it takes approximately 55mins to coast down from 3000rpm to 20-30rpm barring gear speed. We keep watch on all turbo visors parameters in such times
 
0
Kaizad
[NPTI]
 
 
Answer
barring gear motor is used to cross the critical speed which is 20-25% of  rated speed
 
0
Ankit
[NPTI]
 
 
Question
what is scanner air fan & how dose it work & is there any
interlock in power plant
Rank Answer Posted By  
 Question Submitted By :: Brajesh_genus
I also faced this Question!!   ALL Interview .com
Answer
nothing but to remove flame scanner lance dust & taking
suction from atmosfier air and purging to lance & no interlock.
 
0
Brajesh_genus
 
 
Question
WHAT WILL HAPPEN IF ID FAN ON BOILER NOT FUNCTIONING?.CAN THE 
BOILER RUN WITHOUT ID FAN? WHAT IS THE EFFECT?
Rank Answer Posted By  
 Question Submitted By :: Guest
I also faced this Question!!   ALL Interview .com
Answer
Boiler furnance pressure raised & damaged the boiler if ID
Fan is not functioning.We can not run boiler without running
ID Fan.
 
2
Sk Abdul Halim
 
 
Answer
Boiler furnace pressure raised and start back firing and it is cause of furnace blast.
 
0
Devinder Singh
 
 
Answer
if ID FAN ON BOILER NOT FUNCTIONING, FURNACE PRESSURE WILL RAISE AND BYPASS DAMPER WILL OPEN IMMEDIATELY ASPER THE BOILER'S SAFETY INTERLOCK EXECUTION.SO THAT, THE BOILER WILL BE SAFE, WHERE AS BOILER EFFICIENCY WILL BE LOW BECAUSE OF NO HEAT EXCHANGING IN THE COMBUSTION AIR AND FURNACE DRAFT ALSO WILL NOT PERFECT.HENCE BOILER CAN RUN WITHOUT ID FAN WITH LOW LOAD.
 
0
Vellaisamy
 
 
Question
thermal power plants in steam using inlet of turbine.inlet 
of turbine pressure and flow is same as boiler feedpump why 
not use direct to turbine?
Rank Answer Posted By  
 Question Submitted By :: Subhani7894
This Interview Question Asked @   IBPIL , Jsw
I also faced this Question!!   ALL Interview .com
Answer
general
 
0
Subhani7894
 
 
Answer
Makes no sense.
 
0
No
 
 
Answer
BECAUSE STEAM TURBINE IT IS A DEVICE WHICH CONVERT HEAT ENERGY INTO MECHANICAL ENERGY SO WE HAVE REQUIRED SUFFICIENT HEAT , IT WILL COME FROM STEAM.  BUT IN ANOTHER WAY WE HAVE DIRECT WATER USE IN HYDRO POWER PLANT BUT WE CANNOT PLACE HYDRO POWER PLANT IN ANY WHERE SO .....
 
0
Devinder Singh
 
 
Answer
Because at that pressure steam has a energy in the form of
temperature and in turbine it expand ,in expansion we get
work in form of rotating energy, but at the same pressure
water has no heat energy so it can not expand in turbine
means no work output.
 
0
Chanchal Rajput
 
 
Question
What are the motors used in a thermal power plant? (With
type and ht/lt)
What voltage levels are used in a thermal power plant?
Rank Answer Posted By  
 Question Submitted By :: Rubankumar
This Interview Question Asked @   OPG
I also faced this Question!!   ALL Interview .com
Answer
mostly 3 ph induction motor are used in thermal power plant for
condensate extraction pump
cooling tower fan
reactor cooling fan in nuclear power plant
boiler feed pum
vlotage level of such IM are
3.3KV,6.6kv, 11KV
 
0
Ankit
 
 
Question
whatis means of PPA & FSA OR SFA in power plant operation
Rank Answer Posted By  
 Question Submitted By :: Sheikh
I also faced this Question!!   ALL Interview .com
Answer
PPA - power purchase agreement
FSA - Fuel supply agreement
 
0
Mob
 
 
Answer
Personal Protection Apparatus
Standard or Safety First Aid
 
0
Yvette Desmarais
 
 
Question
what are the major duties 
of a instrumentation 
engineer in a power plant.?
Rank Answer Posted By  
 Question Submitted By :: Abhay
This Interview Question Asked @   Gulf
I also faced this Question!!   ALL Interview .com
Answer
Attaining break down.first check fuse of all auxillary supply. Then check 
mechanism and all interlock such as differnt switch .controller 
measuring equipments.Al and DI DO
 
0
Sappy
 
 
Question
why the steam turbine is not operated in home(base) load
more than 1 hour kindly calrify
Rank Answer Posted By  
 Question Submitted By :: Sri151186
This Interview Question Asked @   Tata
I also faced this Question!!   ALL Interview .com
Answer
because churning will come and hp exhaust temperature will go high
 
0
Hardik085
 
 
Answer
It should not be economicql
 
0
Guest
 
 
Question
how many safeties should be present in boiler?what are they?
Rank Answer Posted By  
 Question Submitted By :: Narasi.23
This Interview Question Asked @   Thermax , Pump Technology Pvt Ltd, Dn
I also faced this Question!!   ALL Interview .com
Answer
there are 2 to 6 numbers of safety valves (SVs) on the boiler.
Around 2 Nos on Drum, of one high and one low setpoint.
Around 2 Nos on Superheater Steam Line of one high and one low setpoint.(but less then Drum SV setpoint, to avoid starvation of SH main steam line)
around 2 Nos on reheater line (if reheater is provided)
Apart from it 1 No of EMRV on the HP superheater line, setpoints below that of Safety valves of the lines.

Also we have Relief valves on he HP econimiser, which acts as a Over protection valve (against Pressure)

Remember SVs are Differnt from Relief valves, as RVs are used on liquid whereas SVs are used on Steam line.
 
0
Bhola Shnaker
 
 
Answer
only 6 safety valves used in reheater boilers normally small capacity boiler used 4 safety valves
 
0
Pandian
[Scs Ltd]
 
 
Answer
Totally 9 SV are There
Drum                 - 3 ( left side-1 , right side-2 )
SH Outlet( MS Line ) - 2
RH Inlet             - 1
RH Outlet            - 3

This is for BHEL 210MW Boiler
 
0
Arun
[Scs Ltd]
 
 
Question
Difference between directional earth fault and
non-directional earth fault
Rank Answer Posted By  
 Question Submitted By :: Guest
I also faced this Question!!   ALL Interview .com
Answer
Directional Earth Fault detection is used to isolate a 
fault, when using more than one source of power input.
Current Transformers are used to verify the net sum of 
current as zero between any two sources of power. If there 
is a fault, the breaker between the power sources is 
OPENED. The protection logic will then see if the fault has 
cleared. If the fault has cleared, the fault is on the side 
with ungrounded power source, and will protection logic 
will trip the ungrounded power supply. Conversely if the 
fault continues to flow after the bus tie is OPEN, then the 
fault is on the side of the grounded power supply, and the 
grounded power supply will be tripped.
Non-directional Earth Fault would be a simple fault 
detection, as located on a generator neutral.
 
0
Jerry Smith
 
 
Answer
Directional Earth Fault is the Fault(between Phase/s to
Earth)in the system,if system is using only one source, so
Fault would be in one direction(towards the system)
     where as Non-Directional Earth Fault is the
Fault(between Phase/s to Earth)in the system,if system is
using two or more source, so Fault would be in two
direction(away or towards)
 
0
Manesh S
 
 
 
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