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.
| 201. |
The compressor has to be started |
| A. | Before starting the gas turbine. |
| B. | After starting the gas turbine. |
| C. | Simultaneously with starting of gas turbine. |
| D. | At any time during the operation. |
| Answer» B. After starting the gas turbine. | |
| 202. |
The heating value of gaseous fuels is about |
| A. | 500 kJ/litre |
| B. | 30 kJ/litre |
| C. | 100 kJ/litre |
| D. | 10 kJ/litre |
| Answer» C. 100 kJ/litre | |
| 203. |
The efficiency of the open cycle gas plant is quite low. Why? |
| A. | Gas gets cooled before reaching the turbine wheels. |
| B. | A lot of mechanical energy is used up by the compressor. |
| C. | Both (a) and (b). |
| D. | None of these |
| Answer» D. None of these | |
| 204. |
What would be the temperature of the gas in the combustion chamber? |
| A. | 500 ° |
| B. | 1600 ° |
| C. | 1200 ° |
| D. | 650 ° |
| Answer» C. 1200 ° | |
| 205. |
Mercury is a choice with steam in binary vapour cycle because it has____________? |
| A. | higher critical temperature and pressure |
| B. | higher saturation temperature than other fluids |
| C. | relatively low vapourisation pressure |
| D. | all above |
| Answer» E. | |
| 206. |
Binary’vapour cycles are used to_____________? |
| A. | increase the performance of the condenser |
| B. | increase the efficiency of the plant |
| C. | increase efficiency of the turbine |
| Answer» C. increase efficiency of the turbine | |
| 207. |
The draught produced by steel chimney as compared to that produced by brick chimney for the same height is_____________? |
| A. | less |
| B. | more |
| C. | same |
| D. | may be more or less |
| Answer» C. same | |
| 208. |
For forced draught system, the function of chimney is mainly_____________? |
| A. | to produce draught to accelerate the combustion of fuel |
| B. | to discharge gases high up in the atmosphere to avoid hazard |
| C. | to reduce the temperature of the hot gases discharged |
| D. | none of the above |
| Answer» C. to reduce the temperature of the hot gases discharged | |
| 209. |
In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating________________? |
| A. | decreases with increase in Rankine cycle efficiency |
| B. | increases with increase in Rankine cycle efficiency |
| C. | is unaffected by increase in Rankine cycle efficiency |
| D. | none of the above |
| Answer» C. is unaffected by increase in Rankine cycle efficiency | |
| 210. |
In a regenerative feed heating cycle, the greatest economy is affected___________? |
| A. | when steam is extracted from only one suitable point of steam turbine |
| B. | when steam is extracted from several places in different stages of steam turbine |
| C. | when steam is extracted only from the last stage of steam turbine |
| D. | when steam is extracted only from the first stage of steam turbine |
| Answer» C. when steam is extracted only from the last stage of steam turbine | |
| 211. |
In regenerative cycle feed water is heated by_____________? |
| A. | exhaust gases |
| B. | heaters |
| C. | draining steam from the turbine |
| D. | all above |
| Answer» D. all above | |
| 212. |
The draught produced by chimney of given height at given outside temperature___________? |
| A. | decreases if the chimney gas temperature increases |
| B. | increases if the chimney gas temperature increases |
| C. | remains same irrespective of chimney gas temperature |
| D. | may increase or decrease |
| Answer» C. remains same irrespective of chimney gas temperature | |
| 213. |
The maximum percentage gain in Regenerative feed heating cycle thermal efficiency____________? |
| A. | increases with number of feed heaters increasing |
| B. | decreases with number of feed heaters increasing |
| C. | remains same unaffected by number of feed heaters |
| D. | none of the above |
| Answer» B. decreases with number of feed heaters increasing | |
| 214. |
Carnot cycle comprises of_______? |
| A. | two isentropic processes and two constant volume processes |
| B. | two isentropic processes and two constant pressure processes |
| C. | two isothermal processes and three constant pressure processes |
| D. | none of the above |
| Answer» C. two isothermal processes and three constant pressure processes | |
| 215. |
In Rankine cycle the work output from the turbine is given by__________? |
| A. | change of internal energy between inlet and outlet |
| B. | change of enthaply between inlet and outlet |
| C. | change of entropy between inlet and outlet |
| D. | change of temperature between inlet and outlet |
| Answer» C. change of entropy between inlet and outlet | |
| 216. |
Artificial draught is produced by______________? |
| A. | induced fan |
| B. | forced fan |
| C. | induced and forced fan |
| D. | all of the above |
| Answer» E. | |
| 217. |
Regenerative cycle thermal efficiency_______________? |
| A. | is always greater than simple Rankine thermal efficiency |
| B. | is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure |
| C. | is same as simple Rankine cycle thermal efficiency |
| D. | is always less than simple Rankine cycle thermal efficiency |
| Answer» B. is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure | |
| 218. |
The draught which a chimney produces is called_____________? |
| A. | induced draught |
| B. | natural draught |
| C. | forced draught |
| D. | balanced draught |
| Answer» C. forced draught | |
| 219. |
In a boiler installation the natural draught is produced_____________? |
| A. | due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in |
| B. | due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column |
| C. | due to the fact that at the chimney top the pressure is more than its environmental pressure |
| D. | all of the above |
| Answer» C. due to the fact that at the chimney top the pressure is more than its environmental pressure | |
| 220. |
The draught produced, for a given height of the chimney and given mean temperature of chimney gases_______________? |
| A. | decreases with increase in outside air temperature |
| B. | increases with increase in outside air temperature |
| C. | remains the same irrespective of outside air temperature |
| D. | may increase or decrease with increase in outside air temperature |
| Answer» B. increases with increase in outside air temperature | |
| 221. |
The modern steam turbines are___________? |
| A. | impulse turbines |
| B. | reaction turbines |
| C. | impulse-reaction turbines |
| D. | none of the above |
| Answer» D. none of the above | |
| 222. |
The installed capacity of wind energy in India is about |
| A. | 8000 MW |
| B. | 1500 MW |
| C. | 6000 MW |
| D. | 4000 MW |
| Answer» B. 1500 MW | |
| 223. |
Which type of cylinder configuration is commonly used? |
| A. | Vertical – in line |
| B. | V – type |
| C. | Horizontal type |
| D. | All of these |
| Answer» B. V – type | |
| 224. |
In a 2 stroke engine, the operation cycle are completed in how many strokes and revolution? |
| A. | 4 strokes and 2 revolutions |
| B. | 2 stroke and 2 revolutions |
| C. | 2 strokes and 1 revolution |
| D. | 4 stroke and 4 revolutions |
| Answer» D. 4 stroke and 4 revolutions | |
| 225. |
The speed of the diesel engine may vary from |
| A. | 0 – 100 rpm |
| B. | 200 – 1000 rpm |
| C. | 500 -5000 rpm |
| D. | 1000 – 3000 rpm |
| Answer» E. | |
| 226. |
The diesel plants are mainly used ________. |
| A. | as peak load plants. |
| B. | as base load plants. |
| C. | as standby power plants. |
| D. | both peak and stand by plants. |
| Answer» E. | |
| 227. |
What is the ranging capacity of the diesel plant? |
| A. | 50 – 750 kW |
| B. | 100 – 1175 kW |
| C. | 75 – 3750 kW |
| D. | 150 – 4575 kW |
| Answer» D. 150 – 4575 kW | |
| 228. |
Which among the following instruments are provided on the exhaust line to reduce the pressure? |
| A. | Ducts |
| B. | Muffler |
| C. | Strainers |
| D. | Purifiers |
| Answer» C. Strainers | |
| 229. |
It is very much necessary to treat the makeup water to remove the scale forming the impurities. Which treatment is used? |
| A. | Zeolite softener |
| B. | Lime or lime soda treatment |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» D. None of the above | |
| 230. |
In fuel cell, the ___________ energy is converted into electrical energy? |
| A. | mechanical |
| B. | chemical |
| C. | heat |
| D. | sound |
| Answer» C. heat | |
| 231. |
What is supercharging? |
| A. | Pumping of air into the cylinder at the pressure greater than atmospheric pressure. |
| B. | Pumping of air out of the cylinder at the pressure greater than atmospheric pressure. |
| C. | Pumping of air into the cylinder at the pressure lower than atmospheric pressure. |
| D. | Pumping of air out of the cylinder at the pressure lower than atmospheric pressure. |
| Answer» B. Pumping of air out of the cylinder at the pressure greater than atmospheric pressure. | |
| 232. |
High output diesel engines are started by |
| A. | self starter. |
| B. | compressed air. |
| C. | battery. |
| D. | cranking. |
| Answer» C. battery. | |
| 233. |
The identification of a two stroke engine is given by |
| A. | Cooling system |
| B. | Lubrication system |
| C. | Absence of valve |
| D. | All of these |
| Answer» D. All of these | |
| 234. |
Reflector mirrors used for exploiting the solar energy are called |
| A. | Mantle |
| B. | Heliostats |
| C. | Diffusers |
| D. | Ponds |
| Answer» C. Diffusers | |
| 235. |
Maximum temperature developed in a diesel engine is in the range of |
| A. | 2000 - 2500 °C |
| B. | 500 – 1000 °C |
| C. | 1500 – 2000 °C |
| D. | 1000 – 1500 °C |
| Answer» B. 500 – 1000 °C | |
| 236. |
A pyrometer is used for the measurements of |
| A. | Diffuse radiations only. |
| B. | Direct radiations only. |
| C. | Both direct and diffused radiations. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 237. |
A steam power station requires space______________? |
| A. | equal to diesel power station |
| B. | more than diesel power station |
| C. | less than diesel power station |
| Answer» C. less than diesel power station | |
| 238. |
The function of a solar collector is of converting solar energy into |
| A. | Radiations |
| B. | Electrical energy directions |
| C. | Thermal energy |
| D. | All of the above |
| Answer» D. All of the above | |
| 239. |
Due to which of the following reasons the cables should not be operated too hot ? |
| A. | The oil may loose its viscosity and it may start drawing off from higher levels |
| B. | Expansion of the oil may cause the sheath to burst |
| C. | Unequal expansion may create voids in the insulation which will lead to ionization |
| D. | The thermal instability may rise due to the rapid increase of dielectric losses with temperature |
| E. | All of the above |
| Answer» F. | |
| 240. |
What are pyrheliometers? |
| A. | Instruments measures beam radiations |
| B. | Diffuse radiations |
| C. | Direct radiations only |
| D. | None of the above |
| Answer» B. Diffuse radiations | |
| 241. |
Temperature attained by cylindrical parabolic collector is of the order of |
| A. | 50 – 100 °C |
| B. | 100 – 150 °C |
| C. | 150 – 200 °C |
| D. | 200 – 300 °C |
| Answer» E. | |
| 242. |
In a solar collector, why is the transparent cover provided for? |
| A. | Protect the collector from dust |
| B. | Reduce the heat losses from collector beneath to atmosphere |
| C. | Transmit solar radiation only |
| D. | All of the above |
| Answer» E. | |
| 243. |
What is the working fluid in closed cycle MHD system? |
| A. | Helium and argon |
| B. | Coal |
| C. | Natural gas |
| D. | Potassium |
| Answer» B. Coal | |
| 244. |
Power output per unit volume of a MHD generator is proportional to |
| A. | Specific electrical conductivity of gas |
| B. | Square of the magnetic field strength |
| C. | Square of the fluid velocity |
| D. | All of these |
| Answer» E. | |
| 245. |
In a MHD generator the conductor is made of |
| A. | Copper |
| B. | Liquid metal |
| C. | Gas |
| D. | Liquid metal or gas |
| Answer» E. | |
| 246. |
What does a load duration curve represent? |
| A. | The variation of load during different hours of the day |
| B. | Average load |
| C. | The number of hours for which a particular lasts during the day |
| D. | None of the above |
| Answer» D. None of the above | |
| 247. |
A module in a solar panel refers to_______________. |
| A. | series arrangement of solar cells. |
| B. | parallel arrangement of solar cells. |
| C. | series and parallel arrangement of solar cells. |
| D. | None of the above |
| Answer» D. None of the above | |
| 248. |
Tidal energy utilizes |
| A. | Kinetic energy of water |
| B. | Potential energy of water |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» C. Both (a) and (b) | |
| 249. |
In a fuel cell, electrical energy is produced by |
| A. | Reaction of hydrogen with oxygen |
| B. | Thermionic action |
| C. | Combustion of fuel in the absence of oxygen |
| D. | All of the above |
| Answer» B. Thermionic action | |
| 250. |
What does the chronological load curve indicate? |
| A. | Variation in demand factor during 24 hours. |
| B. | Variation of demand from instant to instant during 24 hour. |
| C. | The total energy consumed upto different times of the day. |
| D. | The total number of hours for which a particular load lasts during the day. |
| Answer» C. The total energy consumed upto different times of the day. | |