MCQOPTIONS
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MCQOPTIONS
This section includes 302 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
On which factor does the calorific value of coal depend? |
| A. | Ash content |
| B. | Size of coal particles |
| C. | Moisture content |
| D. | Volatile material |
| Answer» B. Size of coal particles | |
| 52. |
The coal with highest ash content is ________. |
| A. | Lignite |
| B. | Steam coal |
| C. | Coking coal |
| D. | Bituminous coal |
| Answer» B. Steam coal | |
| 53. |
In De Laval steam turbine___________? |
| A. | the pressure in the turbine rotor is approximately same as in con¬denser |
| B. | the pressure in the turbine rotor is higher than pressure in the con¬denser |
| C. | the pressure in the turbine rotor gradually decreases from inlet to exit from condenser |
| D. | none from the above |
| Answer» B. the pressure in the turbine rotor is higher than pressure in the con¬denser | |
| 54. |
The major content of coal in India is ________________. |
| A. | Dust |
| B. | Ash |
| C. | Fly ash |
| D. | Cinder |
| Answer» C. Fly ash | |
| 55. |
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 |
| Answer» B. is different | |
| 56. |
Which among these is the main component of a gas turbine plant? |
| A. | Condenser |
| B. | Compressor |
| C. | Boiler |
| D. | None of these |
| Answer» C. Boiler | |
| 57. |
What part or % of power developed is utilised for driving the compressor? |
| A. | 65 % |
| B. | 70 % |
| C. | 55 % |
| D. | 80 % |
| Answer» B. 70 % | |
| 58. |
Which type of compressor is used in a gas turbine plant? |
| A. | Reciprocating compressor |
| B. | Screw compressor |
| C. | Multistage axial flow compressor |
| D. | None of these |
| Answer» D. None of these | |
| 59. |
The draught produced by the chimney is________________. |
| A. | Forced draught |
| B. | Natural draught |
| C. | Induced draught |
| D. | Balanced draught |
| Answer» C. Induced draught | |
| 60. |
A condenser condenses the steam coming out from___________. |
| A. | Boiler |
| B. | Turbine |
| C. | Economiser |
| D. | Super heater |
| Answer» C. Economiser | |
| 61. |
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 |
| Answer» D. pressure velocity compounded steam turbine | |
| 62. |
The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________? |
| A. | 0.555 |
| B. | 0.578 |
| C. | 0.5457 |
| D. | 0.6 |
| Answer» D. 0.6 | |
| 63. |
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 |
| Answer» C. pressure compounded impulse steam turbine | |
| 64. |
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 |
| Answer» B. there is enthalpy drop only in fixed blades | |
| 65. |
In a surface condenser if air is removed, there is___________? |
| A. | fall in absolute pressure maintained in condenser |
| B. | rise in absolute pressure maintained in condenser |
| C. | no change in absolute pressure in the condenser |
| D. | rise in temperature of condensed steam |
| Answer» B. rise in absolute pressure maintained in condenser | |
| 66. |
In a shell and tube surface condenser____________? |
| A. | steam and cooling water mix to give the condensate |
| B. | cooling water passes through the tubes and steam surrounds them |
| C. | steam passes through the cooling tubes and cooling water surrounds them |
| D. | all of the above varying with situation |
| Answer» C. steam passes through the cooling tubes and cooling water surrounds them | |
| 67. |
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 |
| Answer» B. decreases with the increase in number of stages | |
| 68. |
In jet type condensers___________? |
| A. | cooling water passes through tubes and steam surrounds them |
| B. | steam passes through tubes and cooling water surrounds them |
| C. | steam and cooling water mix |
| D. | steam and cooling water do not mix |
| Answer» D. steam and cooling water do not mix | |
| 69. |
Steam turbines commonly used in steam power station are__________? |
| A. | condensing type |
| B. | non-condensing type |
| C. | none of the above |
| Answer» B. non-condensing type | |
| 70. |
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 |
| Answer» B. lower | |
| 71. |
The maximum length of a screw conveyer is about___________? |
| A. | 30 metres |
| B. | 40 metres |
| C. | 60 metres |
| D. | 100 metres |
| Answer» B. 40 metres | |
| 72. |
Steam turbines are governed by the following methods_____________? |
| A. | Throttle governing |
| B. | Nozzle control governing |
| C. | By-pass governing |
| D. | all of the above |
| Answer» E. | |
| 73. |
Load carrying capacity of belt conveyor is about___________? |
| A. | 20 to 40 tonnes/hr |
| B. | 50 to 100 tonnes/hr |
| C. | 100 to 150 tonnes/hr |
| D. | 150 to 200 tonnes/hr |
| Answer» C. 100 to 150 tonnes/hr | |
| 74. |
Belt conveyer can be used to transport coal at inclinations upto____________? |
| A. | 30° |
| B. | 60° |
| C. | 80° |
| D. | 90° |
| Answer» B. 60° | |
| 75. |
Primary air is that air which is used to_____________? |
| A. | reduce the flame length |
| B. | increase the flame length |
| C. | transport and dry the coal |
| D. | provide air around burners for get¬ting optimum combustion |
| Answer» D. provide air around burners for get¬ting optimum combustion | |
| 76. |
In coal preparation plant, magnetic separators are used to remove___________? |
| A. | dust |
| B. | clinkers |
| C. | iron particles |
| D. | sand |
| Answer» D. sand | |
| 77. |
For the safety of a steam boiler the number of safety valves fitted are____________? |
| A. | four |
| B. | three |
| C. | two |
| D. | one |
| Answer» D. one | |
| 78. |
Load factor of a power station is defined as____________? |
| A. | maximum demand/average load |
| B. | average load x maximum demand |
| C. | average load/maximum demand |
| D. | none of the above |
| Answer» D. none of the above | |
| 79. |
Blowing down of boiler water is the process_____________? |
| A. | to reduce the boiler pressure |
| B. | to increase the steam temperature |
| C. | to control the solid concentration in the boiler water by removing some of the concentrated saline water |
| D. | none of the above |
| Answer» D. none of the above | |
| 80. |
Deaerative heating is done to_____________? |
| A. | heat the water |
| B. | heat the air in the water |
| C. | remove dissolved gases in the water |
| Answer» D. | |
| 81. |
Annual operating expenditure of a power plant consists of_________? |
| A. | fixed charges |
| B. | semi-fixed charges |
| C. | running charges |
| D. | all of the above |
| Answer» E. | |
| 82. |
TravelUng grate stoker can burn coals at the rates of____________? |
| A. | 50—75 kg/m per hour |
| B. | 75—100 kg/m per hour |
| C. | 100—150 kg/m per hour |
| D. | 150—200 kg/m2 per hour |
| Answer» E. | |
| 83. |
Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________? |
| A. | underfeed stoker |
| B. | overfeed stoker |
| C. | any |
| Answer» C. any | |
| 84. |
Which of the following load is responsible for lower power factor of supply system__________? |
| A. | induction motors |
| B. | resistive loads |
| C. | synchronous Motors |
| D. | all of the above |
| Answer» B. resistive loads | |
| 85. |
The power demand can be estimated approximately by |
| A. | Load survey method. |
| B. | Mathematical method. |
| C. | Statistical method. |
| D. | Economic parameters. |
| Answer» D. Economic parameters. | |
| 86. |
Evaporative type of condenser has___________? |
| A. | steam in pipes surrounded by water |
| B. | water in pipes surrounded by steam |
| C. | either A. or (b) |
| D. | none of the above |
| Answer» B. water in pipes surrounded by steam | |
| 87. |
Lower power factor is usually not due to ____________. |
| A. | Discharge lamp |
| B. | Arc lamps |
| C. | Incandescent lamps |
| D. | Induction furnace |
| Answer» D. Induction furnace | |
| 88. |
What is connected load? |
| A. | Installed electrical load in the premises of the consumer. |
| B. | Maximum load a consumer draws. |
| C. | Load drawn by a consumer at any instant. |
| D. | None of the above. |
| Answer» B. Maximum load a consumer draws. | |
| 89. |
A generating station has a connected load of 55 MW and maximum demand of 20 MW. What is the demand factor? |
| A. | 0.4785 |
| B. | 0.3636 |
| C. | 2.75 |
| D. | 1100 |
| Answer» C. 2.75 | |
| 90. |
Which of the following generating station has minimum running cost? |
| A. | Nuclear |
| B. | Hydro |
| C. | Thermal |
| D. | Diesel |
| Answer» C. Thermal | |
| 91. |
Which among the following plants have the least operating cost? |
| A. | Steam plants |
| B. | Hydro plants |
| C. | Nuclear plants |
| D. | Diesel plants |
| Answer» C. Nuclear plants | |
| 92. |
The power system experiences peak demand from ____________. |
| A. | Midnight to 8 A.M |
| B. | 8 A.M to 2 P.M |
| C. | 2 P.M to 6 P.M |
| D. | 6 P.M to 10 P.M |
| Answer» E. | |
| 93. |
In a steam power station, electric power is generated at what power? |
| A. | 440 V |
| B. | 1.1 kV |
| C. | 11 kV |
| D. | 33 kV |
| Answer» D. 33 kV | |
| 94. |
Reheat factor is the ratio of_____________? |
| A. | isentropic heat drop to useful heat drop |
| B. | adiabatic heat drop to isentropic heat drop |
| C. | cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop |
| Answer» D. | |
| 95. |
Determine the average demand of a plant if its load factor and maximum demand are 0.60 and 30 MW. |
| A. | 20 MW |
| B. | 18 MW |
| C. | 50 MW |
| D. | 13 MW |
| Answer» C. 50 MW | |
| 96. |
What are the essential requirements for power plants to be operated as peak load plants? |
| A. | Capability of quick start, synchronisation and taking up of system load. |
| B. | Quick response to load variations. |
| C. | Low capital cost. |
| D. | All of these. |
| E. | None of these. |
| Answer» E. None of these. | |
| 97. |
What is the modern trend in electric power generation? |
| A. | To have a large number of small size thermal plants located at different places. |
| B. | To have large size thermal plants near load centre. |
| C. | To have large size thermal plants located near coal fields. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 98. |
In hydro power plant, the graph between discharge and time is known as___________? |
| A. | monograph |
| B. | load graph |
| C. | discharge graph |
| D. | hydro graph |
| Answer» E. | |
| 99. |
What does the annual fixed cost include? |
| A. | Fuel, maintenance cost and labour |
| B. | Interest, taxes, insurance and depreciation |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» C. Both (a) and (b) | |
| 100. |
Which components are included in the annual operating cost? |
| A. | Fuel, maintenance cost and labour |
| B. | Interest, taxes, insurance and depreciation |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» B. Interest, taxes, insurance and depreciation | |