MCQOPTIONS
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MCQOPTIONS
This section includes 187 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
*/*_In case of impulse steam turbine? |
| A. | there is enthalpy drop in fixed and moving blades |
| B. | there is enthalpy drop only in moving blades |
| C. | there is enthalpy drop in nozzles |
| D. | none of the above |
| Answer» D. none of the above | |
| 102. |
*/*_The commercial sources of energy are? |
| A. | solar, wind and biomass |
| B. | fossil fuels, hydropower and nuclear energy |
| C. | wood, animal wastes and agriculture wastes |
| D. | none of the above |
| Answer» C. wood, animal wastes and agriculture wastes | |
| 103. |
%_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 | |
| 104. |
%_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 | |
| 105. |
%_The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation._% |
| A. | pv = C |
| B. | pv1A = C |
| C. | pv1i = C |
| D. | pv |
| Answer» E. | |
| 106. |
%_Steam pressure in a steam power station, which is usually kept now-a-days is of the order of_% |
| A. | 20 kgf/cm² |
| B. | 50 kgf/cm² |
| C. | 80 kgf/cm² |
| D. | 100 kgf/cm² |
| Answer» E. | |
| 107. |
%_The value of the reheat factor is of the order of_% |
| A. | 0.8 to 1.0 |
| B. | 1.0 to 1.05 |
| C. | 1.1 to 1.5 |
| D. | above 1.5 |
| Answer» D. above 1.5 | |
| 108. |
%_The commercial sources of energy are_% |
| A. | solar, wind and biomass |
| B. | fossil fuels, hydropower and nuclear energy |
| C. | wood, animal wastes and agriculture wastes |
| D. | none of the above |
| Answer» C. wood, animal wastes and agriculture wastes | |
| 109. |
%_The capacity of large turbo-generators varies from_% |
| A. | 20 to 100 MW |
| B. | 50 to 300 MW |
| C. | 70 to 400 MW |
| D. | 100 to 650 MW |
| Answer» C. 70 to 400 MW | |
| 110. |
%_Caking coals are those which_% |
| A. | burn completely |
| B. | burn freely |
| C. | do not form ash |
| D. | form lumps or masses of coke |
| Answer» E. | |
| 111. |
%_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 | |
| 112. |
%_In case of impulse steam turbine_% |
| A. | there is enthalpy drop in fixed and moving blades |
| B. | there is enthalpy drop only in moving blades |
| C. | there is enthalpy drop in nozzles |
| D. | none of the above |
| Answer» D. none of the above | |
| 113. |
_ The maximum length of a screw conveyer is about$? |
| A. | 30 metres |
| B. | 40 metres |
| C. | 60 metres |
| D. | 100 metres |
| Answer» B. 40 metres | |
| 114. |
_ The draught in locomotive boilers is produced by$? |
| A. | forced fan |
| B. | chimney |
| C. | steam jet |
| D. | only motion of locomotive |
| Answer» D. only motion of locomotive | |
| 115. |
_ Deaerative heating is done to$? |
| A. | Heat the water |
| B. | Heat the air in the water |
| C. | Remove dissolved gases in the water |
| D. | None of these |
| Answer» D. None of these | |
| 116. |
_ For Parson's reaction steam turbine, degree of reaction is$? |
| A. | 75% |
| B. | 100% |
| C. | 50% |
| D. | 60% |
| Answer» D. 60% | |
| 117. |
_ In a shell and tube surface condenser$? |
| A. | steam and cooling water mix to give the condensate |
| B. | cooling water passes through the tubes and steam surrounds them |
| C. | steam passes through the cooling tubes and cooling water surrounds them |
| D. | all of the above varying with situation |
| Answer» C. steam passes through the cooling tubes and cooling water surrounds them | |
| 118. |
_ Mercury is a choice with steam in binary vapour cycle because it has$? |
| A. | higher critical temperature and pressure |
| B. | higher saturation temperature than other fluids |
| C. | relatively low vapourisation pressure |
| D. | all above |
| Answer» E. | |
| 119. |
_ Compounding of steam turbine is done for$? |
| A. | reducing the work done |
| B. | increasing the rotor speed |
| C. | reducing the rotor speed |
| D. | balancing the turbine |
| Answer» D. balancing the turbine | |
| 120. |
_ Steam turbines commonly used in steam power station are$? |
| A. | condensing type |
| B. | non-condensing type |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» B. non-condensing type | |
| 121. |
_ In a regenerative feed heating cycle, the greatest economy is affected$? |
| A. | when steam is extracted from only one suitable point of steam turbine |
| B. | when steam is extracted from several places in different stages of steam turbine |
| C. | when steam is extracted only from the last stage of steam turbine |
| D. | when steam is extracted only from the first stage of steam turbine |
| Answer» C. when steam is extracted only from the last stage of steam turbine | |
| 122. |
__For the safety of a steam boiler the number of safety valves fitted are__ |
| A. | four |
| B. | three |
| C. | two |
| D. | one |
| Answer» D. one | |
| 123. |
__The effect of considering friction in steam nozzles for the same pressure ratio leads to__ |
| A. | increase in dryness fraction of exit steam |
| B. | decrease in dryness fraction of exit steam |
| C. | no change in the quality of exit steam |
| D. | decrease or increase of dryness fraction of exit steam depending upon inlet quality |
| Answer» B. decrease in dryness fraction of exit steam | |
| 124. |
__Underfeed stokers work best for __________ coals high in volatile matter and with caking tendency__ |
| A. | Anthracite |
| B. | Lignite |
| C. | Semi-bituminous and bituminous |
| D. | All of the above |
| Answer» D. All of the above | |
| 125. |
__In coal preparation plant, magnetic separators are used to remove__ |
| A. | Dust |
| B. | Clinkers |
| C. | Iron particles |
| D. | Sand |
| Answer» D. Sand | |
| 126. |
_Binary vapor cycles are used to$? |
| A. | Increase the performance of the condenser |
| B. | Increase the efficiency of the plant |
| C. | Increase efficiency of the turbine |
| D. | None of the above |
| Answer» C. Increase efficiency of the turbine | |
| 127. |
_For the same draught produced the power of induced draught fan as compared to forced draught fan is$? |
| A. | less |
| B. | more |
| C. | same |
| D. | not predictable |
| Answer» C. same | |
| 128. |
_The modern steam turbines are$? |
| A. | impulse turbines |
| B. | reaction turbines |
| C. | impulse-reaction turbines |
| D. | none of the above |
| Answer» D. none of the above | |
| 129. |
_In fuel cell, the ______ energy is converted into electrical energy.$? |
| A. | mechanical |
| B. | chemical |
| C. | heat |
| D. | sound |
| Answer» C. heat | |
| 130. |
_Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is$? |
| A. | underfeed stoker |
| B. | overfeed stoker |
| C. | any |
| D. | none of the above |
| Answer» C. any | |
| 131. |
_The proper indication of incomplete combustion is$? |
| A. | high CO content in flue gases at exit |
| B. | high CO2 content in flue gases at exit |
| C. | high temperature of flue gases |
| D. | the smoking exhaust from chimney |
| Answer» B. high CO2 content in flue gases at exit | |
| 132. |
_Bucket elevators are used for$? |
| A. | carrying coal in horizontal direction |
| B. | carrying coal in vertical direction |
| C. | carrying coal in any direction |
| D. | none of the above |
| Answer» C. carrying coal in any direction | |
| 133. |
_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$? |
| A. | 0.555 |
| B. | 0.578 |
| C. | 0.5457 |
| D. | 0.6 |
| Answer» D. 0.6 | |
| 134. |
_The main source of production of biogas is$? |
| A. | human waste |
| B. | wet cow dung |
| C. | wet livestock waste |
| D. | all above |
| Answer» E. | |
| 135. |
_Edward?s air pump$? |
| A. | removes air and also vapour from condenser |
| B. | removes only air from condenser |
| C. | removes only un-condensed vapour from condenser |
| D. | removes air alongwith vapour and also the condensed water from condenser |
| Answer» E. | |
| 136. |
_Artificial draught is produced by$? |
| A. | induced fan |
| B. | forced fan |
| C. | induced and forced fan |
| D. | all of the above |
| Answer» E. | |
| 137. |
_Curtis turbine is$? |
| A. | reaction steam turbine |
| B. | pressure velocity compounded steam turbine |
| C. | pressure compounded impulse steam turbine |
| D. | velocity compounded impulse steam turbine |
| Answer» C. pressure compounded impulse steam turbine | |
| 138. |
_In ______ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners$? |
| A. | unit |
| B. | central |
| C. | power |
| D. | none of the above |
| Answer» C. power | |
| 139. |
_Primary air is that air which is used to$? |
| A. | reduce the flame length |
| B. | increase the flame length |
| C. | transport and dry the coal |
| D. | provide air around burners for getting optimum combustion |
| Answer» D. provide air around burners for getting optimum combustion | |
| 140. |
In a boiler installation the natural draught is produced$? |
| 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 | |
| 141. |
The effect of considering friction losses in steam nozzle for the same pressure ratio leads to$? |
| A. | increase in exit velocity from the nozzle |
| B. | decrease in exit velocity from the nozzle |
| C. | no change in exit velocity from the nozzle |
| D. | increase or decrease depending upon the exit quality of steam |
| Answer» C. no change in exit velocity from the nozzle | |
| 142. |
Example of overfeed type stoker is$? |
| A. | chain grate |
| B. | spreader |
| C. | travelling grate |
| D. | all of the above |
| Answer» E. | |
| 143. |
Reheat cycle in steam power plant is used to$? |
| A. | utilise heat of flue gases |
| B. | increase thermal efficiency |
| C. | improve condenser performance |
| D. | reduce loss of heat |
| Answer» C. improve condenser performance | |
| 144. |
In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating$? |
| 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 | |
| 145. |
Rankine cycle operating on low pressure limit of p1 and high pressure limit of p2$? |
| A. | Has higher thermal efficiency than the Carnot cycle operating between same pressure limits |
| B. | Has lower thermal efficiency than Carnot cycle operating between same pressure limit |
| C. | Has same thermal efficiency as Carnot cycle operating between same pressure limits |
| D. | May be more or less depending upon the magnitude of p1 and p2 |
| Answer» B. Has lower thermal efficiency than Carnot cycle operating between same pressure limit | |
| 146. |
In a steam power plant, the function of a condenser is$? |
| A. | to maintain pressure below atmospheric to increase work output from the primemover |
| B. | to receive large volumes of steam exhausted from steam prime mover |
| C. | to condense large volumes of steam to water which may be used again in boiler |
| D. | all of the above |
| Answer» E. | |
| 147. |
The critical pressure ratio of a convergent nozzle is defined as$? |
| A. | the ratio of outlet pressure to inlet pressure of nozzle |
| B. | the ratio of inlet pressure to outlet pressure of nozzle |
| C. | the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is min-imum |
| D. | the ratio of outlet pressure to inlet pressure only when mass flow rate = c |
| Answer» E. | |
| 148. |
Economiser is used to heat$? |
| A. | air |
| B. | feed water |
| C. | flue gases |
| D. | all above |
| Answer» C. flue gases | |
| 149. |
Load carrying capacity of belt conveyor is about$? |
| A. | 20 to 40 tonnes/hr |
| B. | 50 to 100 tonnes/hr |
| C. | 100 to 150 tonnes/hr |
| D. | 150 to 200 tonnes/hr |
| Answer» C. 100 to 150 tonnes/hr | |
| 150. |
Solar thermal power generation can be achieved by$? |
| A. | using focusing collector or heliostates |
| B. | using flat plate collectors |
| C. | using a solar pond |
| D. | any of the above system |
| Answer» E. | |