MCQOPTIONS
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MCQOPTIONS
This section includes 84 Mcqs, each offering curated multiple-choice questions to sharpen your Energy Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Equivalent evaporation is the amount of water evaporated in a boiler from and at |
| A. | 0-degree celsius |
| B. | 100-degree celsius |
| C. | saturation temperature at given pressure |
| D. | room temperature |
| Answer» C. saturation temperature at given pressure | |
| 52. |
Babcock-Wilcox boiler is |
| A. | Water-tube boiler |
| B. | Once-through boiler |
| C. | Supercritical boiler |
| D. | Fire-tube boiler |
| Answer» B. Once-through boiler | |
| 53. |
A company wants to expand the solid propellant manufacturing plant by the addition of more than 1 ton capacity curing furnace. Each ton of propellant must undergo 30 minutes of furnace time including loading and unloading operations. Furnace is used only 80 percent of the time due to power restrictions. The required output for the new layout is to be 16 tons per shift (8 hours). Plant (system) efficiency is estimated at 50 percent of system capacity. The number of furnaces required will be |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 4 |
| Answer» B. 2 | |
| 54. |
Lancashire boiler is a __________ boiler |
| A. | Single pass |
| B. | Two pass |
| C. | Three pass |
| D. | Four pass |
| Answer» D. Four pass | |
| 55. |
Equivalence evaporation is defined as |
| A. | the ratio of heat actually used in producing stream to the heat liberated in the furnace |
| B. | the amount of water evaporated in kg per kg of coal burnt |
| C. | evaporation of water from and at 100°C into dry saturated steam |
| D. | evaporation of 15.653 kg of water per hour from and at 100°C |
| Answer» D. evaporation of 15.653 kg of water per hour from and at 100°C | |
| 56. |
A super critical boiler requires |
| A. | Only preheater and superheater |
| B. | Preheater, evaporator and superheater |
| C. | Only preheater |
| D. | Only superheater |
| Answer» B. Preheater, evaporator and superheater | |
| 57. |
A short chimney is provided for |
| A. | Lancashire Boiler |
| B. | Babcock and Wilcox Boiler |
| C. | Locomotive Boiler |
| D. | Cochran Boiler |
| Answer» D. Cochran Boiler | |
| 58. |
According to IBR regulations, boilers exceeding need regular inspection and certification. |
| A. | capacity of more than 15 litres |
| B. | capacity of more than 5 gallons |
| C. | capacity lesser than 5 gallons |
| D. | capacity of more than 50 gallons |
| Answer» C. capacity lesser than 5 gallons | |
| 59. |
Identify the incorrect statement, from the following options:The measurement of temperature, flow rate, and CO and CO2 content in a boiler chimney gases help one to calculate ________. |
| A. | Possibility of condensation of moisture in flue gas lines |
| B. | Energy lost as by partial combustion of fuel |
| C. | Loss due to incomplete combustion of fuel on grate |
| D. | Heat carried away by flue gases |
| Answer» D. Heat carried away by flue gases | |
| 60. |
For supplying feed water to a boiler which of the following pump is not used |
| A. | Steam injector |
| B. | Reciprocating pump |
| C. | Multistage centrifugal pump |
| D. | Gear pump |
| Answer» E. | |
| 61. |
In a power plant, the efficiencies of the electric generator, turbine, boiler, thermodynamic cycle and the overall plant are 0.97, 0.95, 0.92, 0.42 and 0.33 respectively. The total electricity generated for running the auxiliaries will be nearly |
| A. | 4.9% |
| B. | 5.7% |
| C. | 6.5% |
| D. | 7.3% |
| Answer» E. | |
| 62. |
Boiler rating is usually defined in terms of |
| A. | Maximum temperature of steam in Kelvin |
| B. | Heat transfer in KJ/hr |
| C. | Heat transfer area in metre2 |
| D. | Steam output in kg/hr |
| Answer» E. | |
| 63. |
A steam ejector which removes air and other non-condensable gases from the condenser is known as |
| A. | Wet air pump |
| B. | Dry air pump |
| C. | Centrifugal pump |
| D. | Circulating pump |
| Answer» C. Centrifugal pump | |
| 64. |
In a steam power plant, blow down is basically nothing but wastage of _______ from the boiler. |
| A. | unburnt coal |
| B. | water |
| C. | flue gases |
| D. | ash |
| Answer» C. flue gases | |
| 65. |
Identify the incorrect statement, from the following options. In the La Mont high pressure boiler _______. |
| A. | Radiation is the only mode of heat transfer to the water tubes |
| B. | Radiant as well as convective evaporating tubes are used |
| C. | Small diameter water tubes are used giving less weight and cost |
| D. | Small diameter tubes with high fluid velocities are used to obtain high heat transfer rates |
| Answer» B. Radiant as well as convective evaporating tubes are used | |
| 66. |
Natural draught is produced: |
| A. | By the use of steam jet |
| B. | By the use of chimney |
| C. | By the use of mechanical fan & steam jet |
| D. | By the use of mechanical fan |
| Answer» C. By the use of mechanical fan & steam jet | |
| 67. |
Fusible plug in a steam boiler is placed ______. |
| A. | at the crown of the furnace |
| B. | below the water level indicator |
| C. | at the fire grate of the boiler |
| D. | near the manhole |
| Answer» B. below the water level indicator | |
| 68. |
Operating pressure for the once-through boiler is: |
| A. | subcritical |
| B. | subcritical and critical |
| C. | critical |
| D. | super-critical |
| Answer» E. | |
| 69. |
Lancashire boiler has ________ flue tube(s), whereas Cornish boiler has ________ flue tube(s). |
| A. | 1; 2 |
| B. | 2; 1 |
| C. | 2; 2 |
| D. | 3; 2 |
| Answer» C. 2; 2 | |
| 70. |
A thermal power plant operates on a regenerative cycle with a single open feedwater heater, as shown in the figure. For the state points shown the specific enthalpies are : h1 = 2800 kJ/kg and h2 = 200 kJ/kg. The bleed to the feedwater heater is 20% of the boiler steam generation rate. The specific enthalpy at state 3 is |
| A. | 720 kJ/kg |
| B. | 2280 kJ/kg |
| C. | 1500 kJ/kg |
| D. | 3000 kJ/kg |
| Answer» B. 2280 kJ/kg | |
| 71. |
In a Lancashire boiler, the heat is transferred to the water by: |
| A. | Blow-down |
| B. | Natural circulation of water between water tubes and drum |
| C. | Radiation from walls of the furnace |
| D. | Flue tubes immersed in the water |
| Answer» E. | |
| 72. |
In a Lancashire boiler, the economiser is located |
| A. | Before air preheater |
| B. | After air preheater |
| C. | Between feed pump and boiler |
| D. | Not used |
| Answer» B. After air preheater | |
| 73. |
_____ boiler has unique characteristic of NOT having a steam separating drum. |
| A. | Benson |
| B. | LaMont |
| C. | Velox |
| D. | Loeffler |
| Answer» B. LaMont | |
| 74. |
Bull’s eye refers to a type of: |
| A. | bi-colour gauge |
| B. | flow measurement gauge |
| C. | pressure gauge |
| D. | manometric gauge |
| Answer» B. flow measurement gauge | |
| 75. |
IN_WHAT_IS_WATER_IN_HIGH_PRESSURE_BOILER_CIRCULATED_THROUGH??$ |
| A. | Conduits |
| B. | Cove |
| C. | Channel |
| D. | Tubes |
| Answer» E. | |
| 76. |
WHAT_IS_NEEDED_TO_BE_INCREASED_TO_INCREASE_THE_HEAT_TRANSFER_RATE_IN_THE_BOILER??$ |
| A. | Gas velocities |
| B. | Fuel input |
| C. | Water velocities |
| D. | Air supply |
| Answer» D. Air supply | |
| 77. |
What increases as steam pressure increases inside a boiler? |
| A. | Force |
| B. | Density |
| C. | Rate of steam conversion |
| D. | Viscosity |
| Answer» C. Rate of steam conversion | |
| 78. |
The _________ may have water circulation either by natural means due to difference in density or by external means. |
| A. | Piping |
| B. | Tubes |
| C. | Furnace |
| D. | Boiler |
| Answer» E. | |
| 79. |
What is the temperature at which the steam boilers are capable to withstand? |
| A. | 200<sup>o</sup>C |
| B. | 280<sup>o</sup>C |
| C. | 540<sup>o</sup>C |
| D. | 358<sup>o</sup>C |
| Answer» D. 358<sup>o</sup>C | |
| 80. |
Which type of boilers is preferred cost wise when the boilers are required to raise less than 30 tonnes of steam? |
| A. | Flued boiler |
| B. | Cornish boiler |
| C. | Butterley boiler |
| D. | Shell boiler |
| Answer» E. | |
| 81. |
How can be the plant efficiency of steam power plant is increased? |
| A. | By using high pressure and high temperature steam |
| B. | By equipping ash and flue gas clearance system |
| C. | By maintaining the boiler on daily basis by cleaning the soot and combustion products |
| D. | By using better and efficient type of fuel for combustion |
| Answer» B. By equipping ash and flue gas clearance system | |
| 82. |
What is the critical average pressure at which the single boiler unit per turbines is designed to handle? |
| A. | 150 bar |
| B. | 220 bar |
| C. | 740 bar |
| D. | 575 bar |
| Answer» C. 740 bar | |
| 83. |
Why single boiler unit per turbine is equipped commonly? |
| A. | For better turbine control |
| B. | To deduce the costs |
| C. | For overcoming losses of power |
| D. | To improve the efficiency |
| Answer» B. To deduce the costs | |
| 84. |
What is the function of boiler? |
| A. | To burn the fuel in a confined closed system with the supply of air |
| B. | To generate steam at varying pressure |
| C. | To generate steam at constant pressure |
| D. | To produce flue gases by burning fuel at a given pressure |
| Answer» D. To produce flue gases by burning fuel at a given pressure | |