Description : The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler. (A) Evaporative capacity (B) Evaporation efficiency (C) Thermal efficiency (D) Steam load
Last Answer : (A) Evaporative capacity
Description : Steam pressures usually used in thermal power plants are (A) 5 kg/cm2 to 10 kg / cm2 (B) 50 kg/cm2 to 100 kg / cm2 (C) 110 kg/cm2 to 170 kg / cm2 (D) 200 kg/cm2 to 215 kg / cm2
Last Answer : Ans: C
Description : Why the Thermal efficiency of the steam power plant is quite low?
Last Answer : In Steam power station, more than 50% of the total heat of combustion is lost as heat rejected to the condenser and the loss is unavoidable as the heat energy cannot be converted in to mechanical ... lowest temperature. This is the reason that the thermal efficiency of the power plant is quite low.
Description : What is the overall efficiency of the Thermal Power Plant or Steam Power Plant?
Last Answer : Overall efficiency of the system is defined as the ratio of heat equivalent of electrical output to the heat of combustion. Generally Overall efficiency of the steam plant will always be ... by multiplying the thermal efficiency of the plant with efficiency of the generator (electrical efficiency)
Description : What is the Thermal efficiency of steam power plant?
Last Answer : Thermal efficiency of steam power plant is defined as the ratio of heat equivalent of mechanical energy transmitted to the turbine shaft to the heat of combustion. Generally Thermal efficiency of the steam power plant will be in the range of 30-35%
Description : In Lurgi coal gasifier, (A) Coking coals cannot be used (B) Low carbon conversion efficiency is achieved (C) Entrainment of solids is higher (D) Larger quantity of coal can be processed
Last Answer : (D) Larger quantity of coal can be processed
Description : On what factors efficiency (thermal) of the steam plant depends?
Last Answer : Efficiency of the thermal plant depends on three factors, they are pressure of steam entering the turbine temperature of the steam entering the turbine pressure in the condenser Thermal efficiency ... as low as possible. Thermal efficiency also increases by reheating the steam between turbine stages
Description : Combustion of pulverised coal compared to the lumpy coal (A) Provides better control of furnace temperature (B) Facilitates combustion with lower excess air (C) Provides higher thermal efficiency & flame temperature (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : While coupled power and bending loss favor a high D, which Dvalue, smaller or larger, improves fiber bandwidth?
Last Answer : Smaller.
Description : The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the (A) Fuel cost per unit power generated is less (B) Thermal efficiency of the former is higher (C) Maintenance cost of the former is less (D) None of these
Last Answer : (A) Fuel cost per unit power generated is less
Description : High temperature carbonisation of coal produces (A) Inferior coke compared to low temperature carbonisation (B) Less of gases compared to liquid products (C) Larger quantity of tar compared to low temperature carbonisation (D) None of these
Last Answer : (D) None of these
Description : What consists of cooling water circuit and coal & ash circuit in steam power plant?
Last Answer : The cooling water circuit consists of a pump, condenser and cooling tower. The coal and ash circuit consists of coal delivery, preparation of coal, handling of coal to the boiler furnace, ash handling and ash storage.
Description : The correct sequence of factors in order of deceasing importance for location of a thermal power plant is [IAS-2001] (a) load, coal, water (b) coal, water, load (c) Water, load, coal (d) water, coal, load
Last Answer : (b) coal, water, load
Description : Overall thermal efficiency of a steam power station in India is in the range: A) 18-24 percent B) 30-40 percent C) 44-62 percent D) 68-79 percent
Last Answer : Overall thermal efficiency of a steam power station in India is in the range: 30-40 percent
Description : Coal used in power plant is also known as (A) steam coal (B) charcoal (C) coke (D) soft coal.
Last Answer : Ans: A
Description : n a chemical factory where dyes are made, wet cake at 30 OC consisting of 60% moisture is put in a dryer to obtain an output having only 5% moisture, at atmospheric pressure. In each batch about 120 ... dryer and the dryer efficiency is 80%. Latent heat of steam at 4 kg/cm2 is 520 kcal/kg.
Last Answer : Given that Qty of material dried per batch - 120 Kgs Moisture at inlet - 60% a. The quantity of moisture removed per batch. Water quantity in a wet batch - 120 x 0.6 = 72 Kgs. Quantity of bone dry ... - 48/0.95 = 50.5 Kgs. Equivalent water in a dry batch - 50.5 - 48 = 2.5 Kgs.
Description : A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the (A) Presence of large ... fuel (C) High sulphur content in the fuel (D) Lack of thorough mixing of fuel with air
Last Answer : (D) Lack of thorough mixing of fuel with air
Description : A reciprocating compressor is not suitable for use as a supercharger because: A. it runs at lower rpm B. the pressure ratio is high C. volumetric efficiency is high D. it is bulky and can handle small quantity of air
Last Answer : ANSWER : D
Description : Ratio of actual indicated work to hypothetical indicated work in a steam engine is the (a) Indicated thermal efficiency (b) Friction factor (c) Mechanical efficiency (d) Diagram factor
Last Answer : Ans : d
Description : Steam distillation is used to (A) Reduce the number of plates (B) Avoid thermal decomposition of a component (C) Increase the efficiency of separation (D) Increase the total pressure of distillation
Last Answer : (B) Avoid thermal decomposition of a component
Description : Which of the following has the least thermal efficiency? (A) Steam engine (B) Carnot engine (C) Diesel engine (D) Otto engine
Last Answer : A) Steam engine
Description : Boiler efficiency is a measure of how effectively _______ energy in fuel is converted into heat energy in steam going to the turbines A Chemical energy B Heat energy C Thermal energy D All of the above
Last Answer : A Chemical energy
Description : For same power output and same r, as compared to 2- stroke engines, four stroke SI engines have (a) Higher fuel consumption (b) Lower thermal efficiency (c) Highest exhaust temperatures (d) Higher thermal efficiency
Last Answer : Ans :d
Description : The heat recoverable from flue gases of furnaces depends on the (A) Thermal efficiency of furnace (B) Quantity of flue gases (C) Flue gas temperature drop through the furnace (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : What are different types of Steam boilers used in Thermal Power Plants?
Last Answer : Answer: Different type of boiler used in thermal power plants are: • Fire tube boiler • Water tube boiler • Natural Circulation boiler • Forced Circulation boiler • Once through boiler
Last Answer : Different type of boiler used in thermal power plants are: Fire tube boiler Water tube boiler Natural Circulation boiler Forced Circulation boiler Once through boiler
Description : A ultra-supercritical steam generator operates at pressures above the critical pressure- a. 2400 psi b. 1500 psi c. 3200 psi d. 4600 psi
Last Answer : c. 3200 psi
Description : In the Lurgi coal gasifier (A) Coking coals cannot be used (B) Low carbon conversion efficiency is achieved (C) Entrainment of solids is higher (D) Large quantity of coal can be processed
Last Answer : (D) Large quantity of coal can be processed
Description : Pick out the wrong statement about cavitation. (A) Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation ... (D) Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine blades
Last Answer : (D) Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine blades
Description : Pick out the wrong statement. (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal (B) Low grade coal can be used, but generally high volatile ... and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing (D) None of these
Description : Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent. (A) 10-15 (B) 25-30 (C) 45-50 (D) 65-70
Last Answer : (B) 25-30
Description : Finned tube heat exchangers (A) Give larger area per tube (B) Use metal fins of low thermal conductivity (C) Facilitate very large temperature drop through tube wall (D) Are used for smaller heat load
Last Answer : (A) Give larger area per tube
Description : Washing of coal (A) Reduces its sulphur and ash content (B) Controls its ash fusibility and increases its calorific value (C) Improves its coking properties (D) All (A), (B) and (C)
Description : Washing of coal (A) Reduces its ash & sulphur content (B) Improves its coking properties (C) Increase the fusion point of its ash by removing chlorine compounds (D) All (A), (B) and (C)
Description : In an induction machine, if the air gap increased a) Speed will be reduced b) Efficiency will be improved c) Power factor will be lowered d) Breakdown torque will be reduced
Last Answer : Ans: Power factor will be lowered
Description : Pick out the correct statement. (A) Compression ratio of an Otto engine is comparatively higher than a diesel engine (B) Efficiency of an Otto engine is higher than that of a diesel ... Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work
Last Answer : (B) Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio
Description : Pick out the wrong statement. (A) Strongly caking coal should not be used in the Lurgi gasifier (B) Acetylene gas cannot be used for illumination purpose (C) Water gas is called blue gas ... is burnt (D) Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels
Last Answer : (B) Acetylene gas cannot be used for illumination purpose
Description : The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the (A) Water alkalinity & leakage (B) Hydrazine addition during ... treatment (C) Release of non-condensable gas from water in the boiler (D) Scale formation
Last Answer : (C) Release of non-condensable gas from water in the boiler
Description : Thermal efficiency of an internal combustion engine on weak mixture is a. higher b. lower c. unaffected d. unpredictable
Last Answer : ANSWER a. higher
Description : The gas that causes suffocation and death when coal or coke is burnt in a closed room is - (1) Methane (2) Ethane (3) Carbon monoxide (4) Carbon dioxide
Last Answer : (3) Carbon monoxide Explanation: Exhaust fumes of motor cars, gases produced, from coal fire in a closed room and coal gas, all contain carbon monoxide, which is the cause of their ... is stable compound. This causes oxygen starvation in the body tissues and eventually causes death by suffocation.
Description : Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because (A) Its calorific value is very less (B) Tar neutralises the residual acids ... for its transportation through pipelines at economic pressure drop (D) All (A), (B) and (C)
Last Answer : (C) It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
Description : Green coal, in order to be burnt, must be (A) Heated sufficiently (B) Burnt in excess air (C) Heated to its ignition point (D) Burnt as powder
Last Answer : (C) Heated to its ignition point
Description : The gas that causes suffocation and death when coal or coke is burnt in a closed room is (1) Methane (2) Ethane (3) Carbon monoxide (4) Carbon di–oxide
Last Answer : Carbon monoxide
Description : What Consists Of Cooling Water Circuit And Coal & Ash Circuit In Steam Power Plant?
Description : Which of the following plant is having lowest load factor? a) Diesel Plant b) Pumped storage Plant c) Thermal Plant d) Nuclear Plant
Last Answer : Ans: Diesel Plan
Description : At lower temperatures and pressures, the latent heat of vaporization of a refrigerant (a) decreases (b) increases (c) remains same (d) depends on other factors
Last Answer : Ans: b
Description : Excessive humming of AC contactors may be caused by ______________. A. burnt arc shields B. shorted armature coils C. a broken shading coil D. high voltage
Last Answer : Answer: C
Description : The rankine cycle efficiency of steam power plant is (1) 60-80% (3) 30-45% (2) 45-80% (4) 20-30%
Last Answer : The rankine cycle efficiency of steam power plant is 30-45%
Description : Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an (A) Economiser (B) Steam superheater (C) Air preheater (D) All (A), (B) and (C)