Power Plant Guruji

Question 1.The capacity of induced draft fan compared to forced draft fan in a boiler is ………. A. Same B. More C. Less D. Depending upon size of boiler Ans. B Question 2.O2 content in atmospheric air on volume basis is ………… A. 21% B. 23% C. 30% D. 78% Ans. A Question 3.Scale is formed on heat transfer surface when……………….. A. Water is acidic B. Water is alkaline C. Water contains dissolved gases D. Water contains dissolved calcium and magnesium salts. Ans. D Question 4.Which one of the following fuel has the highest hydrogen content and lowest sulphur content …………… A. Coal B. Furnace oil C. Natural gas D. LSHS Ans. C Question 5.For boiler water treatment chemical dosing with small discharge at high pressure, pump preferred is ………… A. Centrifugal B. Axil flow C. Propeller D. Reciprocating Ans. D Question 6.High % of carbon monoxide presence in the flue gas of boiler is an indicator of …………… A. Complete combustion B. Good control of pollutants C. Low excess air D. High excess air Ans. C Qu

Question 1. The height of chimney in a power plant is governed by A. The draft to be created norms B. Sulphur in fuel C. Control of pollution & government D. None  Ans. B Question 2. Cavitation occurs in Pump A. Suction pipe B. Discharge pipe C. NRV’s D. None of above Ans. D Question 3. Proximate analysis of coal gives the following result A. Carbon, hydrogen, nitrogen, sulphur B Fixed carbon, Ash , volatiles , moisture C. Lower Calorific Value D Higher Calorific Value Ans. B Question 4. A steam pipe is to be insulted by two insulting materials put over each other. For better result A. Both may be put in any order B. Better insulator of the two should be put first then cover by less insulating C. Lower insulator material should be first put and covered with higher insulating material D. Depends on the steam temperature and conductivity of pipe Ans. B Question 5. The use of primary air in a PF boiler is for A. Carrying pulverised coal to the burners B. Cooling the boiler walls C. Ta

Question 1. In a typical 200MW boiler, Emergency blow down tapping is taken from A. Drum B. Down comers/ring header C. De-aerator D. Can be any of the above Ans. A Question 2. which of the following is softer coal for grinding? A. Coal with HGI of 55 B. Coal with HGI of 45 C. Coal with HGI of 68 D. Any of the above Ans. C Question 3.typical combustion efficiency of a CFBC boiler is A. 40-60% B. 77-88% C. 88-96% D. 97-98% Ans. C Question 4.Drum material in typical 200MW boiler is A. Alloy steel B. Carbon steel C. Stainless steel D. All of the above Ans. B Question 5.Chromatographic analyser is used to measure the A. Oxygen in flue gas B. Carbon dioxide in flue gas C. Amount of individual gases in flue gas D. Sulphur dioxide in flue gas Ans. C Question 6.Spectrophotometer is used to A. Measure surface characteristics B. Measure chemical composition of alloy C. Gas composition D. Analyze colour spectrum Ans. B Question 7.The Orsat apparatus is used for measuring A. Chemical analysis of fl

Question 1. Name the fan more suitable for high pressure application A. Propeller type fan B. Tube axial fan C. Backward curved centrifugal fan D. None of the above Ans. C Question 2. ESP works on the principle of A. Corona effect B. Induction effect C. Skin effect D. None of the above Ans. A Question 3. A solution having 4 pH is more acidic than a solution of 7 pH A. 03 times B. 30 times C. 100 times D. 1000 times Ans. D Question 4. Demineralisation of water is the process to remove A Dissolved oxygen B. Dissolved salts C. Carbon dioxide D. Chlorine Ans. B Question 5. Which of the following parameter remains constant during ideal throttling process A. Pressure B. Entropy C. Enthalpy D. Temperature Ans. C Question 6. Which of the following substance will have same percentage in ultimate and proximate a A. Hydrogen B. Moisture C. Ash D. Volatile matter Ans. C Question 7.Atomising of LDO in burners is carried out through A. Steam B. Compressed air C. Self pressure D. All of the above Ans

Question 1. Incomplete combustion can be best judged by A. Smoke at chimney exit B. Excess air in fuel gas C. Measuring carbon monoxide in fuel gas D. Measuring temperature of fuel gas at exit of furnace Ans. C Question 2. In water wall furnace the heat is transferred to water will by A. Convection B. Radiation C. Conduction D. Radiation & conduction Ans. D Question 3. For industrial process heating the best quality of steam is A. Dry saturated steam B. Super heated steam C. Wet steam D. High pressure steam Ans. A Question 4. The parameter used by ASME to defined fans, blowers and compressors A. Fan ratio B. Specific ratio C. Blade ratio D. Twist ratio Ans. B Question 5. In a glass tube type water level indicator for a boiler , one end of the tube is connected to the water space and the other end is connected to A. Water space also B. Chimney C. Steam space D. Superheater Ans. C Question 6. The maximum heat loss in a boiler occurs due to A. Moisture in fuel B. Dry flue gases C. Ste

Question 1. Which is the common coal firing system used in Indian thermal power plant A. stoker firing B. pulverised coal firing C. pressurised bed D. fluidised bed Ans. B Question 2. Deaeration of boiler feed water is referred to us A. removal of scales by blow down B. removal of silica C. removal of dissolved gases D. phosphate treatment of feed water Ans. C Question 3. In industrial applications the type of trap used for main steam lines A. thermodynamic B. bimetallic C. float D. thermostatic Ans. A Question 4. Proper sizing of steam pipeline helps in minimising A. steam requirement B. pressure drop C. temperature drop D. boiler efficiency Ans. B Question 5. The Turndown ratio' for oil fired boiler burners is the ratio of A. air to fuel B. maximum fuel input to actual fuel inputs C. maximum air input over minimum air input D. maximum fuel input over minimum fuel input Ans. D Question 6. Which fuel requires the lowest amount of excess air for combustion A. natural gas B. Furnace

 Question 1. Cooling towers: 1. Remove the heat from the condensate 2. Should use water treatment 3. Prevent thermal pollution of rivers and lakes 4. Cannot be used during winter periods 5. Remove the sensible heat of the steam in the condenser  A. 2, 3  B. 1, 3, 4  C. 1, 3, 4, 5   D. 3, 4, 5   E.  2, 3, 4 Ans. A Question 2.Short term overheating usually exhibits:  A. Thin lip longitudinal rupture  B.  Thick lips longitudinal rupture  C.  Transverse cracks  D.   Severe pitting Ans. A  Question 3. High Temperature stress rupture and oxidation resistant can be increased by: A.  Alloying additives of Nickel and Tin B. Alloying additives of Phosphorus and Silicone C. Alloying additives of Molybdenum and Chromium D. Alloying additives of Aluminium and Boron Ans. C Question 4. Which of the following boilers has emerged as an alternative to conventional boilers because of its higher combustion efficiency? A. Fluidised bed combustion boiler B. Packaged boiler C. Stoker fired boiler D. Chain gr

 Qualifications: Post Graduates (MCA), Engineers (Civil), Engineers (CS/IT), Engineers (Electrical), Engineers (Electronics), Engineers (Electronics and Communication), Engineers (Mechanical), Engineers (Others) Experience Type : Experience Tenure Type : Contract Basis States : Delhi, Maharashtra National Thermal Power Corporation (NTPC) is inviting eligible candidates to apply for 9 contractual posts of Associate. Interested Eligible Candidates may send their applications as per prescribed format to concerned E-mail address by 23-12-2021. All the relevant documents must be sent alongwith application form, as proof of suitability for the posts. Email subject must be formed properly, containing name of post applied for. Vacancies & Eligibility Criteria : Post Vacancy Age Qualification Pay Associate 9 max 63 yrs BE/B. Tech in Computer Science/ IT or MCA and min 15 yrs experience as per norms * candidates are advised to check the official notice.   Dates to Consider: Application forms

Q.1 Main objective of a boiler trial is ? A. To determine the generating  capacity of the boiler B. To determine the thermal efficiency of the boiler, when working at a definite pressure C. To prepare heat balance sheet for the boiler D. All of the above Ans. D Q.2 Which super heater in a boiler has a dropping characteristics? A.Pendent super heater  B.convection super hater C. Radiant super heater D.conduction super heater Ans. C Q.3 Size of boiler tubes is specific by- A.Mean diameter and thickness B.Inside diameter and thickness C. Outside diameter & thickness D.Outside diameter alone  Ans. C You May Also Read :  Expansion and Contraction in Boilers Q.4 Reheating of steam under ideal condition takes place at constant A.Entropy B.Enthalpy C .Pressure D.Temparature Ans. C Q.5 The fusible plug in small boilers is located- A. In the drum B. In the fire tubes C. Above steam dome D. Over the combustion chamber Ans. D Q.6 Reheat cycle in steam power plant is used to- A. Prevent excess

 1.What is the method of priming? a) With a flooded suction b) A bypass around the discharge check valve    c)The foot  valve with auxiliary liquid supply d) All of the above 2. In Priming, the removal of air by filling the pump passages i.e. flow passages e.g. The impeller and the volute casing with liquid. a) True b) False 3. For Smooth operation in centrifugal pump NPSHA should be -------- than NPSHR a) Greater b) Less 4. Adverse effects of cavitation include a) Metallic erosion b) Deterioration pump performance c) Failure of pump components and Instability in flow pattern of pumping liquid d) All of the above 5. Operating point gets at the intersection of System curve and Efficiency curve. a) True b) False 6. Flat curve a) Shows little variation of head at all flows between design point & shut-off. b) Head developed at shut-off is less than head developed at some flow between B.E.P & shut-off. c) None of the above Pump Curves - 6 Types of head vs flow rate curves 7. Mechani

  Pump affinity laws : For a particular pump the head developed & the discharge can be controlled, within certain limits, according to the affinity laws. When only impeller dia. changes & speed remains the same Q2 = Q1 x (D2/D1) H2 =  H1 x (D2/D1)2 BKW2 = BKW1 x (D2/D1)3 When only speed changes & impeller diameter remains the same Q2 = Q1 x (N2/N1) H2 = H1 x (N2/N1)2 BKW2 = BKW1 x (N2/N1)3 When both dia & speed change Q2 = Q1 x (D2/D1)x (N2/N1) H2 = H1 x (D2/D1) x (N2/N1)2 BKW2 = BKW1 x (D2/D1) x (N2/N1)3 Q1, H1, BKW1, D1 & N1 ARE CAPACITY, HEAD, INPUT POWER IN KW, IMPELLER DIA. & SPEED AT INITIAL CONDITION. Q2, H2, BKW2, D2 & N2 ARE CAPACITY, HEAD, INPUT POWER IN KW, IMPELLER DIA. & SPEED AT CHANGED CONDITION. Related Documents : Pump Curves - 6 Types of head vs flow rate curves Types of Mechanical Seals in Pump  How to start and stop a centrifugal pump   Cavitation formation in the pump What is pump losses

  1. Flat curve Shows little variation of head at all flows between design point & shut-off. When a system consists of mostly Static Head or Static Pressure difference, it is termed a flat system curve.  Head vs Flow Flat curve What is priming in pump ? 2. Unstable curve The same head is developed at more than one flow rates . Head vs Flow Unstable curve 3. Stable curve Only one flow rate at any one head.It is called stable if it exhibits a continuously negative slope (negative differential quotient from head and flow with regard to the Q axis. Head Vs Flow Stable curve Why pumps are used in series and parallel ? 4. Steep curve Large increase in head developed at shut-off from B.E.P. When a system consists of mostly frictional resistance  it is termed a steep system curve. With a steep curve, we can notice a steeper arch, resulting in a larger head (pressure) increase as the flow decreases, compared to the Steadily rising Curve. Head Vs Flow Steep curve How to calculate suction hea

  Pump Losses Losses in a centrifugal pump  are classified into five types namely, mechanical losses, impeller losses, leakage losses , disk friction losses and casing hydraulic losses. Recommended : Types of Mechanical Seals in Pump   How to start and stop a centrifugal pump   Cavitation formation in the pump Type of losses exists inside the centrifugal pump Casing Hydraulic Losses Leakage losses Impeller losses Disk friction losses Mechanical losses Pump casing hydraulic losses Casing hydraulic loss is caused when fluid flows through the impeller, the pump housing casing, there is a change of flow rate and inverse pressure gradient magnitude and direction of the circulation and cause vortex, resulting in energy loss. Pump leakage losses There can be slipping back of part of liquid through the clearance between the impeller and casing due to pressure difference between inlet and outlet. This loss of energy of liquid is known as leakage losses. You May Also Like : What are the types of

What are Mechanical Seals for Pumps  The Sealing of a rotating shaft passing through a pump casing is also achieved by means of a rotating, optically flat seat, rubbing against a stationary, optically flat seat. Stationary seat is inserted into a gland plate or seal chamber and the spring loaded rotating face is mounted on the shaft. The spring holds the rotating face against the stationary face and sealing occurs in between rotating and stationary parallel faces. Also Read : Why use Mechanical seal in pump Gland seal vs. Mechanical seal Why priming centrifugal pumps How many types of mechanical seals are there  Shaft mounted or cartridge type Balanced and unbalanced type Pusher and non-pusher type Single and multiple seals  Externally and internally mounted seal Single and multiple spring seal  Mechanical Seal Types You May Also Like : What are the types of pump ? Coolant and lubricant Types of valve used in power plant Calculate suction head in centrifugal pump A variety  of seals ar