MCQOPTIONS
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MCQOPTIONS
This section includes 371 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The radius of a dished head is taken approximately as______________________? |
| A. | one-fourth |
| B. | half |
| C. | one |
| D. | two |
| E. | three |
| Answer» D. two | |
| 102. |
Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C__________________? |
| A. | and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2 |
| B. | and its corresponding conversion into dry steam at desired boiler pressure |
| C. | conversion into steam at atmospheric condition |
| D. | conversion into steam at the same pres-sure at which feed water is supplied |
| E. | none of the above |
| Answer» B. and its corresponding conversion into dry steam at desired boiler pressure | |
| 103. |
The increase in pressure _________________? |
| A. | lowers the boiling point of a liquid |
| B. | raises the boiling point of a liquid |
| C. | does not affect the boiling point of a liquid |
| D. | reduces its volume |
| E. | none of the above |
| Answer» C. does not affect the boiling point of a liquid | |
| 104. |
Hygrometery deals with the_________________? |
| A. | Hygroscopic substances |
| B. | water vapour in air |
| C. | temperature of air |
| D. | pressure of air |
| E. | density measurement |
| Answer» C. temperature of air | |
| 105. |
Alkaline pyrogallate is used in Orsat’s apparatus for absorption of _________________? |
| A. | C02 |
| B. | CO |
| C. | 02 |
| D. | N2 |
| E. | none of the above |
| Answer» D. N2 | |
| 106. |
Efficiency of rankine cycle can be increased by_________________? |
| A. | decreasing initial steam pressure and temperature |
| B. | increasing exhaust pressure |
| C. | decreasing exhaust pressure |
| D. | increasing the expansion ratio |
| E. | increasing number of regenerative heaters |
| Answer» B. increasing exhaust pressure | |
| 107. |
For burning 1 kg of carbon to CO as per chemically correct combusiton, amount of air required is___________________? |
| A. | 1 kg |
| B. | 4/3kg |
| C. | 8/3kg |
| D. | 2 kg |
| E. | 16/3 kg |
| Answer» C. 8/3kg | |
| 108. |
The lenght of Cornish boiler is of the order of _________________? |
| A. | 2-4 m |
| B. | 3-5 m |
| C. | 5-7.5 m |
| D. | 7-9 m |
| E. | 9-11 m |
| Answer» D. 7-9 m | |
| 109. |
Which of the following gases has the highest calorific value ________________? |
| A. | producer gas |
| B. | coal gas |
| C. | water gas |
| D. | blast furnace gas |
| E. | coke oven gas |
| Answer» C. water gas | |
| 110. |
Which of the following is a fire tube boiler________________? |
| A. | locomotive boiler |
| B. | Babcock and Wilcox boiler |
| C. | Stirling boiler |
| D. | all of the above |
| E. | none of the above |
| Answer» B. Babcock and Wilcox boiler | |
| 111. |
The biggest size of thermal power unit operating in India is ________________? |
| A. | 30 MW |
| B. | 60 MW |
| C. | 100 MW |
| D. | 210 MW |
| E. | 500 MW |
| Answer» F. | |
| 112. |
Steam engine operates on_________________? |
| A. | carnot cycle |
| B. | joule cycle |
| C. | Stirling cycle |
| D. | brayton cycle |
| E. | none of the above |
| Answer» E. none of the above | |
| 113. |
Water tube boilers are those in which________________? |
| A. | flue gases pass through tubes and water around it |
| B. | water passes through the tubes and flue gases around it |
| C. | work is done during adiabatic expansion |
| D. | change in enthalpy |
| E. | none of the above |
| Answer» D. change in enthalpy | |
| 114. |
Lancashire boiler is of____________________? |
| A. | stationary |
| Answer» F. | |
| 115. |
Which of the following substance will have same percentage in both proximate and ultimate analysis___________________? |
| A. | ash |
| B. | volatile matter |
| C. | moisture |
| D. | hydrogen |
| E. | none of the above |
| Answer» B. volatile matter | |
| 116. |
The high pressure boiler is oiie producing steam at a pressure more than_________________? |
| A. | atmospheric pressure |
| B. | 5 kg/cm2 |
| C. | 10 kg/cm2 |
| D. | 40 kg/cm2 |
| E. | 75-80 kg/cm2 |
| Answer» F. | |
| 117. |
The diameter of cylindrical shell of the Lancashire boiler is of the order of__________________? |
| A. | 1 tp 1.25m |
| B. | 1 to 1.75 m |
| C. | 2 to 4 m |
| D. | 1.75 to 2.75 m |
| E. | 2.25 to 4.5 m |
| Answer» E. 2.25 to 4.5 m | |
| 118. |
The diameter of internal flue tubes in a Lancashire boiler compared to its shell is_________________? |
| A. | one-half |
| B. | one-third |
| C. | one-fourth |
| D. | one-fifth |
| E. | two-fifth |
| Answer» F. | |
| 119. |
Gusset stays in a boiler are provided to____________________? |
| A. | prevent the bulging of flat surfaces |
| B. | avoid explosion in furnace |
| C. | prevent leakage of hot flue gases |
| D. | support furnace freely from top |
| E. | prevent atmospheric air leaking into furnace |
| Answer» B. avoid explosion in furnace | |
| 120. |
Calorific value of coal is of the order of _______________________? |
| A. | 200-400 kcal/kg |
| B. | 800-1200 kcal/kg |
| C. | 2000-4000 kcal/kg |
| D. | 5000-8000 kcal/kg |
| E. | 8000-10,000 kcal/kg |
| Answer» D. 5000-8000 kcal/kg | |
| 121. |
A supercritical boiler is one that operates above the pressure and temperature of following values_____________________? |
| A. | 100 kg/cm2 and 540°C |
| B. | 1 kg/cm2 and 100°C |
| C. | 218 kg/cm2 abs and 373°C |
| D. | 218 kg/cm2 abs and 540°C |
| E. | 100 kg/cm2 abs and 373°C |
| Answer» D. 218 kg/cm2 abs and 540°C | |
| 122. |
Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________? |
| A. | higher effectiveness of boiler |
| B. | high calorific value coal being burnt |
| C. | fouling of heat transfer surfaces |
| D. | raising of steam temperature |
| E. | leakage of air |
| Answer» D. raising of steam temperature | |
| 123. |
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 |
| E. | burnt as lumps |
| Answer» D. burnt as powder | |
| 124. |
The three “Ts” for good combustion are____________________? |
| A. | temperature, time, and turbulance |
| B. | total air, true fuel, and turbulance |
| C. | thorough mixing, total air, and temperature |
| D. | total air, time, and temperature |
| E. | none of the above |
| Answer» B. total air, true fuel, and turbulance | |
| 125. |
The behaviour of coal in a furnace is determained by_______________________? |
| A. | the content of sulphur |
| B. | the content of ash and heating value |
| C. | the proximate analysis |
| D. | the exact analysis |
| E. | its type |
| Answer» D. the exact analysis | |
| 126. |
The proximate analysis of fuel lists__________________? |
| A. | various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume |
| B. | various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight |
| C. | fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash |
| D. | fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash |
| E. | moisture and ash free heating value |
| Answer» E. moisture and ash free heating value | |
| 127. |
Sulphur in coal results in___________________? |
| A. | causing clinkering and slagging |
| B. | corroding air heaters |
| C. | spontaneous combustion during coal storage |
| D. | facilitating ash precipitation |
| E. | all of the above |
| Answer» F. | |
| 128. |
During storage, the heating value of coal __________________? |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | may increase or decrease depending upon the method of storage |
| E. | none of the above |
| Answer» C. remains constant | |
| 129. |
Pour point of fuel oil is the____________________? |
| A. | lowest temperature at which oil will flow under set condition |
| B. | storage temperature |
| C. | temperature at which fuel is pumped through burners |
| D. | temperature at which oil is transported |
| E. | none of the above |
| Answer» B. storage temperature | |
| 130. |
In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________? |
| A. | remain unaffected |
| B. | improve C. worsen |
| C. | may improve/worsen depending on size |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 131. |
Deaeration of feed water is carried out because it reduces ____________________? |
| A. | cavitation of .boiler feed pumps |
| B. | corrosion caused by oxygen |
| C. | heat transfer coefficient |
| D. | pH value of water |
| E. | weight of water to be handled |
| Answer» C. heat transfer coefficient | |
| 132. |
Overfire burning is the phenomenon of _____________________? |
| A. | supply of excess, air |
| B. | supply of excess coal |
| C. | burning CO and unburnts in upper zone of furnace by supplying more air |
| D. | fuel bed firing |
| E. | none of the above |
| Answer» D. fuel bed firing | |
| 133. |
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________? |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | first increases and then decreases |
| E. | first decreases and then increases |
| Answer» C. remains unaffected | |
| 134. |
The condition of steam in boiler drum is always ___________________? |
| A. | dry |
| B. | wet |
| C. | saturated |
| D. | supersaturated |
| E. | superheated |
| Answer» C. saturated | |
| 135. |
In locomotive boiler, maximum steam pressure is limited to_______________? |
| A. | 1 kg/cm2 |
| B. | 5 kg/cm2 |
| C. | 10 kg/cm2 |
| D. | 18 kg/cm2 |
| E. | 31 kg/cm2 |
| Answer» E. 31 kg/cm2 | |
| 136. |
Which of the following boilers is best suited to meet fluctuating demands___________________? |
| A. | babcock and wilcox |
| B. | locomotive |
| C. | lancashire |
| D. | cochran |
| E. | comish |
| Answer» C. lancashire | |
| 137. |
The shell diameter and length of locomotive boiler are_______________? |
| A. | 1.5 m, 4 m |
| B. | 1.5 m, 6 m |
| C. | 1 m, 4 m |
| D. | 2 m, 4 m |
| E. | 1.5 m, 8 m |
| Answer» B. 1.5 m, 6 m | |
| 138. |
Boiler parameters are expressed by ___________________? |
| A. | tonnes/hr. of steam |
| B. | pressure of steam in kg/cm2 |
| C. | temperature of steam in °C |
| D. | all of the above |
| E. | none of the above |
| Answer» E. none of the above | |
| 139. |
Feed water conditioning in thermal power plants in done to__________________? |
| A. | reduce hardness and for removal of solids |
| B. | increase efficiency-of thermal power plant |
| C. | increase *heat transfer rate |
| D. | increase steam parameters |
| E. | all of the above |
| Answer» B. increase efficiency-of thermal power plant | |
| 140. |
In natural circulation type boiler _______________? |
| A. | heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum |
| B. | water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture |
| C. | feed pump is employed to supplement natural circulation in water wall type furnace |
| D. | water is converted into steam in one . pass without any recirculation |
| E. | water is fed at atmospheric pressure |
| Answer» B. water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture | |
| 141. |
Locomotive boiler is of the following type__________________? |
| A. | multitubular |
| B. | horizontal |
| C. | internally fired |
| D. | mobile |
| E. | all of the above |
| Answer» F. | |
| 142. |
A boiler in India should conform to safety regulations of__________________? |
| A. | DIN |
| B. | BS |
| C. | ASTM |
| D. | IBR |
| E. | GOST |
| Answer» E. GOST | |
| 143. |
Which of the following varieties of coals is mostly used in steam boilers____________________? |
| A. | non-coking bituminous coal |
| B. | brown coal |
| C. | peat |
| D. | coking bituminous coal |
| E. | none of the above |
| Answer» F. | |
| 144. |
Hard coke is produced by carborisation of coal at_______________? |
| A. | atmospheric temperature |
| B. | 500-600°C |
| C. | 70O-850°C |
| D. | 95O-1100°C |
| E. | 120O-1500°C |
| Answer» E. 120O-1500°C | |
| 145. |
Hard coke is used in________________? |
| A. | cement industry |
| B. | thermal power plant |
| C. | blast furnace |
| D. | domestic use |
| E. | locomotives |
| Answer» D. domestic use | |
| 146. |
Pick up the correct statement as regards Cornish boiler and Lancashire boiler _______________? |
| A. | cornish is fire tube and lancashire is water tube |
| B. | cornish is water tube and lancashire is fire tube |
| C. | cornish has two fire tubes and lancashire has one |
| D. | lancashire has two fire tubes and cornish has one |
| E. | both have two fire tubes |
| Answer» E. both have two fire tubes | |
| 147. |
Duplex feed pumps are used in small steam boilers. These operate on the principle of_________________? |
| A. | centrifugal pump |
| B. | axial flow pump |
| C. | gear pump |
| D. | ejector pump |
| E. | reciprocating pump |
| Answer» F. | |
| 148. |
During polytropic process_________________? |
| A. | heat transfer takes place across cylinder walls |
| B. | work is done |
| C. | steam may be wet, dry or superheated after expansion |
| D. | all of the above |
| E. | none of the above |
| Answer» E. none of the above | |
| 149. |
The water tubes in a babcock and wilcox boiler are__________________? |
| A. | horizontal |
| B. | vertical |
| C. | inclined |
| D. | horizontal and inclined |
| E. | vertical and inclined |
| Answer» D. horizontal and inclined | |
| 150. |
Locomotive type’ boiler is__________________? |
| A. | horizontal multitubular water tube boiler |
| B. | water wall enclosed furnace type |
| C. | vertical tubular fire tube type |
| D. | horizontal multi-tubular fire tube type |
| E. | none of the above types |
| Answer» E. none of the above types | |