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.
| 151. |
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 | |
| 152. |
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 | |
| 153. |
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 | |
| 154. |
Example of overfeed type stoker is? |
| A. | chain grate |
| B. | spreader |
| C. | travelling grate |
| D. | all of the above |
| Answer» E. | |
| 155. |
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 | |
| 156. |
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. | |
| 157. |
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. | |
| 158. |
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. | |
| 159. |
Economiser is used to heat? |
| A. | air |
| B. | feed water |
| C. | flue gases |
| D. | all above |
| Answer» C. flue gases | |
| 160. |
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 | |
| 161. |
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 | |
| 162. |
The cooling section in the surface condenser |
| A. | increases the quantity of vapour extracted along with air |
| B. | reduces the quantity of vapour extracted along with air |
| C. | does not affect vapour quantity extracted but reduces pump capacity of air extraction pump |
| D. | none of the above |
| Answer» C. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump | |
| 163. |
The average ash content in Indian co als is about |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» E. | |
| 164. |
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 | |
| 165. |
A steam power station requires space |
| A. | equal to diesel power station |
| B. | more than diesel power station |
| C. | less than diesel power station |
| D. | none of the above |
| Answer» C. less than diesel power station | |
| 166. |
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 |
| D. | none of the above |
| Answer» D. none of the above | |
| 167. |
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 | |
| 168. |
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 | |
| 169. |
The artificial draught normally is designed to produce |
| A. | less smoke |
| B. | more draught |
| C. | less chimney gas temperature |
| D. | all of the above |
| Answer» E. | |
| 170. |
In India largest thermal power station is located at |
| A. | Kota |
| B. | Sarni |
| C. | Chandrapur |
| D. | Neyveli |
| Answer» D. Neyveli | |
| 171. |
Method which is commonly applied for unloading the coal for small power plant is |
| A. | lift trucks |
| B. | coal accelerators |
| C. | tower cranes |
| D. | belt conveyor |
| Answer» C. tower cranes | |
| 172. |
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 | |
| 173. |
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 | |
| 174. |
Parson's turbine is |
| A. | pressure compounded steam turbine |
| B. | simple single wheel, impulse steam turbine |
| C. | simple single wheel reaction steam turbine |
| D. | multi wheel reaction steam turbine |
| Answer» E. | |
| 175. |
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 | |
| 176. |
The percentage O2 by Weight in atmospheric air is |
| A. | 18% |
| B. | 23% |
| C. | 77% |
| D. | 79% |
| Answer» C. 77% | |
| 177. |
The value of reheat factor normally varies from |
| A. | 0.5 to 0.6 |
| B. | 0.9 to 0.95 |
| C. | 1.02 to 1.06 |
| D. | 1.2 to 1.6 |
| Answer» D. 1.2 to 1.6 | |
| 178. |
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 | |
| 179. |
The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is |
| A. | 0.6 |
| B. | 0.578 |
| C. | 0.555 |
| D. | 0.5457 |
| Answer» C. 0.555 | |
| 180. |
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 | |
| 181. |
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. | |
| 182. |
The energy radiated by sun on a bright sunny day is approximately |
| A. | 700 W/m² |
| B. | 800 W/m² |
| C. | 1 kW/m² |
| D. | 2 kW/m² |
| Answer» D. 2 kW/m¬¨‚⧠| |
| 183. |
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 | |
| 184. |
Belt conveyer can be used to transport coal at inclinations upto |
| A. | 30° |
| B. | 60° |
| C. | 80° |
| D. | 90° |
| Answer» B. 60¬¨‚àû | |
| 185. |
The amount of air which is supplied for complete combustion is called |
| A. | primary air |
| B. | secondary air |
| C. | tertiary air |
| D. | none of the above |
| Answer» C. tertiary air | |
| 186. |
In De Laval steam turbine |
| A. | the pressure in the turbine rotor is approximately same as in condenser |
| B. | the pressure in the turbine rotor is higher than pressure in the condenser |
| 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 condenser | |
| 187. |
Reheat factor in steam turbines depends on |
| A. | exit pressure only |
| B. | stage efficiency only |
| C. | initial pressures and temperature only |
| D. | all of the above |
| Answer» D. all of the above | |