Power Plant Operation

Write the safety precautions to be taken during isolation of equipment.

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In a fluid coupling, connecting an induction motor and a fan, choose possibility

(i) motor speed can be changed by the fluid coupling

(ii) fan speed can be changed by the fluid coupling

(iii) both motor and fan speed can be changed by the fluid coupling

(iv) none of these is possible 

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The fan characteristics curve is a plot of

(i) static pressure vs flow                 (ii) dynamic pressure vs Now

(iii) total pressure vs flow                 (iv) suction pressure vs flow

Differentiate between cold, hot and warm start-up.

What is FSSS? How the auxiliary air dampers are modulating in a tangential fired Boiler? 

Discuss the functioning of HP/LP bypass system.

What are the operations to be followed if turbine control valves suddenly close during normal operation of a Power Plant? 

Describe boiler light-up procedure including pre-checks.

What is the difference between planned and forced shutdown.

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Which of the following heat recovery equipment works on a refrigeration cycle?

(i) Thermo compressor               (ii) Heat wheel              (iii) Heat pump          (iv) Heat pipe

Write the performance parameters to be monitored in case of coal mill,condenser, and regenerative feed heaters in a power plant.

Write five boiler and five turbine emergencies.

Describe the protections used in steam turbine operation.

Write the steps for turbine rolling and synchronization.

Write the roles of Recirculation line, Balance leak off line and Hydraulic coupling with scoop control in a BFP operation.

In between Boiler drum safety valve and super heater safety valve, which one will pop first during pressure rising and why? What would be your action?

What are the chemical dosing associated with feed water, condensate and a drum.

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A boiler gas pass is purged before light up in order to

(i)Warm up the gas pass

(ii) Cool down the gas pass

(iii) Remove deposits from metal surface

(iv) Remove unburnt combustibles from boiler. L .

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Which is not the critical speed of the turbine?

(i) 1585 rpm (ii) 2489 rpm (iii) 1881 rpm (iv) 2879 rpm

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If high pressure turbine, metal temperature is above 350°C, the type of start to be chosen is

(i) Hot start            (ii) warm start              (iii) cold start               (iv) none of these

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In a coal based modern thermal power station time required from light up to synchronization during cold start up under normal operating conditions considering all equipment availability is

(i) 2 hrs              (ii) 3 hrs             (iii) 4 hrs                (iv) 5 hrs

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A rise in conductivity of boiler feed water indicates

(i) Drop in the contamination of feed water

(ii) greater purity of feed water

(iii) rise in the contamination of feed water

(iv) it has got no relation with the contamination of feed water. 

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(i) 33%                 (ii) 42%                   (iii) 55%                 (iv) 60% 

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In the pre check for boiling light up, it is to be ensured that

(i) Safety valve are gaged                               (ii) drum vent is closed

(iii) soot blowers are in advanced position   (iv) non of these

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During the following condition Boiler trip automatically

(i) floating of Boiler drum safety valve

(ii) high super heater metal temperature

(iii) re-heater steam temperature becomes less than super heated steam temperature

(iv) very high furnace draft

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Signature Analyzer is used to determine

(i) Vibration parameters in static condition

(ii) vibration parameters in dynamic condition

(iii) Ieakage

(iv) crack  

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The purpose of venting air from steam systems is because air is a/an

(i) Insulator             (ii) good conductor                          (iii) inert substance           (iv) dilutant.

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The type of firing used for a pulverized coal fired boiler is

(i) Over-firing                                   (ii) tangential firing

(iii) vertical firing                            (iv) mixed firing of effective heat transfer