Power plant instrumentation interview questions pdf

And syllabus NTPC. Pls leave to my email id in PDF. Email- nageshgowda gmail. Please send all mcq of Electrical Engineering with solution my email bjp gmail. Hi, I want all questions related to electrical engineering so that i can prepare better for my upcoming tests. It will be very helpful for me if you can send me these questions. I want question and answer about thermal and gas power plant. Your email address will not be published.

The commercial sources of energy are a solar, wind and biomass b fossil fuels, hydropower and nuclear energy c wood, animal wastes and agriculture wastes d none of the above Ans: b 2.

The proper indication of incomplete combustion is a high CO content in flue gases at exit b high CO2 content in flue gases at exit c high temperature of flue gases d the smoking exhaust from chimney Ans: a 7. The main source of production of biogas is a human waste b wet cow dung c wet livestock waste d all above Ans: d 8.

Solar thermal power generation can be achieved by a using focusing collector or heliostates b using flat plate collectors c using a solar pond d any of the above system Ans: d Thorium Breeder Reactors are most suitable for India because a these develop more power b its technology is simple c abundance of thorium deposits are available in India d these can be easily designed Ans: c The overall efficiency of thermal power plant is equal to a Rankine cycle efficiency b Carnot cycle efficiency c Regenerative cycle efficiency d Boiler efficiency x turbine efficiency x generator efficiency Ans: c Rankine cycle efficiency of a good steam power plant may be in the range of a 15 to 20 per cent 6 35 to 45 per cent c 70 to 80 per cent d 90 to 95 per ceut Ans: b Rankine efficiency of a steam power plant a improves in summer as compared to that in winter 6 improves in winter as compared to that in summer c is unaffected by climatic conditions d none of the above Ans: b Carnot cycle comprises of a two isentropic processes and two constant volume processes b two isentropic processes and two constant pressure processes e two isothermal processes and three constant pressure processes d none of the above Ans: b In Rankine cycle the work output from the turbine is given by a change of internal energy between inlet and outlet b change of enthaply between inlet and outlet c change of entropy between inlet and outlet d change of temperature between inlet and outlet Ans: b Regenerative cycle thermal efficiency a is always greater than simple Rankine thermal efficiency b is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure c is same as simple Rankine cycle thermal efficiency d is always less than simple Rankine cycle thermal efficiency Ans: a In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating a decreases with increase in Rankine cycle efficiency b increases with increase in Rankine cycle efficiency c is unaffected by increase in Rankine cycle efficiency d none of the above Ans: b In a regenerative feed heating cycle, the greatest economy is affected a when steam is extracted from only one suitable point of steam turbine b when steam is extracted from several places in different stages of steam turbine c when steam is extracted only from the last stage of steam turbine d when steam is extracted only from the first stage of steam turbine Ans: b The maximum percentage gain in Regenerative feed heating cycle thermal efficiency a increases with number of feed heaters increasing b decreases with number of feed heaters increasing c remains same unaffected by number of feed heaters d none of the above Ans: a In regenerative cycle feed water is heated by a exhaust gases b heaters c draining steam from the turbine d all above Ans: c Reheat cycle in steam power plant is used to a utilise heat of flue gases b increase thermal efficiency c improve condenser performance d reduce loss of heat Ans: b Mercury is a choice with steam in binary vapour cycle because it has a higher critical temperature and pressure b higher saturation temperature than other fluids c relatively low vapourisation pressure d all above Ans: d A steam power station requires space a equal to diesel power station b more than diesel power station c less than diesel power station Ans: b Economiser is used to heat a air b feed water c flue gases d all above Ans: b The modern steam turbines are a impulse turbines b reaction turbines c impulse-reaction turbines d none of the above Ans: c The draught which a chimney produces is called a induced draught b natural draught c forced draught d balanced draught Ans: b The draught produced by steel chimney as compared to that produced by brick chimney for the same height is a less b more c same d may be more or less Ans: b In a boiler installation the natural draught is produced a due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in b due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column c due to the fact that at the chimney top the pressure is more than its environmental pressure d all of the above Ans: b The draught produced, for a given height of the chimney and given mean temperature of chimney gases a decreases with increase in outside air temperature b increases with increase in outside air temperature c remains the same irrespective of outside air temperature d may increase or decrease with increase in outside air temperature Ans: a The draught produced by chimney of given height at given outside temperature a decreases if the chimney gas temperature increases b increases if the chimney gas temperature increases c remains same irrespective of chimney gas temperature d may increase or decrease Ans: b For forced draught system, the function of chimney is mainly a to produce draught to accelerate the combustion of fuel b to discharge gases high up in the atmosphere to avoid hazard c to reduce the temperature of the hot gases discharged d none of the above Ans: b Artificial draught is produced by a induced fan b forced fan c induced and forced fan d all of the above Ans: d The draught in locomotive boilers is produced by a forced fan b chimney c steam jet d only motion of locomotive Ans: c For the same draught produced the power of induced draught fan as compared to forced draught fan is a less b more c same d not predictable Ans: b Artificial draught is produced by a air fans b steam jet c fan or steam jet d all of the above Ans: d The artificial draught normally is designed to produce a less smoke b more draught c less chimney gas temperature d all of the above Ans: d For the induced draught the fan is located a near bottom of chimney b near bottom of furnace c at the top of the chimney D anywhere permissible Ans: a The pressure at the furnace is minimum in case of a forced draught system b induced draught system c balanced draught system d natural draught system Ans: c The effect of considering friction losses in steam nozzle for the same pressure ratio leads to a increase in exit velocity from the nozzle 6 decrease in exit velocity from the nozzle c no change in exit velocity from the nozzle d increase or decrease depending upon the exit quality of steam Ans: b The effect of considering friction in steam nozzles for the same pressure ratio leads to a increase in dryness fraction of exit steam b decrease in dryness fraction of exit steam c no change in the quality of exit steam d decrease or increase of dryness fraction of exit steam depending upon inlet quality Ans: a In case of impulse steam turbine a there is enthalpy drop in fixed and moving blades b there is enthalpy drop only in moving blades c there is enthalpy drop in nozzles d none of the above Ans: c The pressure on the two sides of the impulse wheel of a steam turbine a is same b is different c increases from one side to the other side d decreases from one side to the other side Ans: a Incase of reaction steam turbine a there is enthalpy drop both in fixed and moving blades b there is enthalpy drop only in fixed blades c there is enthalpy drop only in moving blades d none of the above Ans: a Curtis turbine is a reaction steam turbine b pressure velocity compounded steam turbine c pressure compounded impulse steam turbine d velocity compounded impulse steam turbine Ans: b Rateau steam turbine is a reaction steam turbine b velocity compounded impulse steam turbine c pressure compounded impulse steam turbine d pressure velocity compounded steam turbine Ans: c Reheat factor in steam turbines depends on a exit pressure only b stage efficiency only c initial pressures and temperature only d all of the above Ans: c Steam turbines are governed by the following methods a Throttle governing b Nozzle control governing c By-pass governing d all of the above Ans: d In steam turbines the reheat factor a increases with the increase in number of stages b decreases with the increase in number of stages c remains same irrespective of number of stages d none of the above Ans: a The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is a higher b lower c same as long as initial pressure and temperature is unchanged d none of the above Ans: a Posted by sudheesh From kuwait.

Posted by wew From qw sws. Posted by Falah From Dammam. Posted by saran From Tuticorin. Posted by srivenkatesh From newyork. Posted by kuldeep singh From karnal. Posted by pradeep From banglore. Posted by tamana From kuwait. Posted by Bidyut From Rourkela. Posted by aravinth kumar From chennai. Posted by Julio From Inhambane. Posted by sivaprasad. Posted by hussain From bangalore. Posted by saravanan From chennai. Posted by Nikhil From Thrissur. Posted by jagan From kakinada. Posted by kiran From mumbi.

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Posted by mayur From mumbai. Posted by Hardik From Mumbai. Posted by ulaganathanthangaiah45 gmail. Posted by Dhanesh Kumar From Mumbai. Posted by aishwarya From salem. Posted by sinto From kochi. Large core displacement are required for appreciable amount of differential output. Temperature affects the performance of the transducer. They are sensitive to stray magnetic fields. The temperature of a substance is a measure of hotness or coldness of that substance. Lower fixed point or ice point.

Upper fixed point or steam point. Expansion Thermometer. Filled system Thermometer. Electrical Thermometer. Gas-filled Thermometer. Liquid-filled Thermometer. Mercury-filled Thermometer. Vapour-filled Thermometer. If two dissimilar metals are joined together to form a closed circuit, there will be two junction where they meet each other.

If one of these junctions is heated, then a current flow in the circuit which can be detected by a galvanometer. The amount of current depends on the difference in temperature between the two junctions and on the characteristics of the two metals.

See back effect is used in thermocouple. It is used to protect the thermocouple from harmful atmosphere, corrosive fluids and also to prevent from mechanical damage. They have negative temperature coefficient of resistance i. Resistance thermometer. Radiation pyrometer b. It is used to measure high temperature. By adjusting the emissivity. Process Flow Diagram A flow diagram is a simple illustration that uses process symbols to describe the primary flow path through a unit 2.

Process and Instrument drawing A process and instrument drawing is more complex. This list should be used in relation to IEC , so we get some more uniform tree on engineering, construction and maintenance for all activities related reliabilaty. Many thanks.