MCQOPTIONS
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MCQOPTIONS
This section includes 317 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
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 | |
| 252. |
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 | |
| 253. |
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. | |
| 254. |
The percentage O2 by Weight in atmospheric air is |
| A. | 18% |
| B. | 23% |
| C. | 77% |
| D. | 79% |
| Answer» C. 77% | |
| 255. |
Load center in a power station is |
| A. | Center of coal fields |
| B. | Center of maximum load of equipments |
| C. | Center of gravity of electrical system |
| D. | None of the above |
| Answer» D. None of the above | |
| 256. |
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 | |
| 257. |
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 | |
| 258. |
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 | |
| 259. |
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 | |
| 260. |
Thorium Breeder Reactors are most suitable for India because |
| A. | these develop more power |
| B. | its technology is simple |
| C. | abundance of thorium deposits are available in India |
| D. | these can be easily designed |
| Answer» D. these can be easily designed | |
| 261. |
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 | |
| 262. |
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 | |
| 263. |
Economiser is used to heat |
| A. | air |
| B. | feed water |
| C. | flue gases |
| D. | all above |
| Answer» C. flue gases | |
| 264. |
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 | |
| 265. |
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 | |
| 266. |
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 | |
| 267. |
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 | |
| 268. |
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. | |
| 269. |
The net work done in a Rankine Cycle is the difference of? |
| A. | Condenser work & Boiler work |
| B. | Boiler work & Pump work |
| C. | Turbine Work & Pump work |
| D. | Condenser work & Pump work |
| Answer» D. Condenser work & Pump work | |
| 270. |
For analytical purposes, the Rankine Cycle is assumed to be in? |
| A. | Unsteady flow operation |
| B. | Turbulent flow operation |
| C. | Steady flow operation |
| D. | Laminar flow operation |
| Answer» D. Laminar flow operation | |
| 271. |
Ideal ‘Rankine Cycle’ is a __________ process. |
| A. | Reversible |
| B. | Irreversible |
| C. | Both of the mentioned |
| D. | None of the mentioned |
| Answer» B. Irreversible | |
| 272. |
Which of these shouldn’t be there in the pipelines of working fluid for achieving the conditions of Carnot Cycle? |
| A. | Heat Transfer |
| B. | Insulation |
| C. | Lubrication |
| D. | Zero Friction |
| Answer» B. Insulation | |
| 273. |
The elements of a Carnot heat engine are? |
| A. | Heat Exchangers, Turbine, Pump |
| B. | Heat Exchangers, Turbine, Evaporator |
| C. | Heat Exchangers, Turbine, Condenser |
| D. | Heat Exchangers, Turbine, Superheater |
| Answer» B. Heat Exchangers, Turbine, Evaporator | |
| 274. |
Heat input & output is obtained in? |
| A. | 2 reversible adiabatics |
| B. | 2 reversible isotherms |
| C. | 1 reversible isotherm & 1 reversible adiabatic |
| D. | 2 reversible isotherms & 1 reversible adiabatic |
| Answer» C. 1 reversible isotherm & 1 reversible adiabatic | |
| 275. |
Work input and work outputs are given & obtained in? |
| A. | 2 reversible adiabatics |
| B. | 2 reversible isotherms |
| C. | 1 reversible isotherm & 1 reversible adiabatic |
| D. | 2 reversible isotherms & 1 reversible adiabatic |
| Answer» B. 2 reversible isotherms | |
| 276. |
Which of these constitute a Carnot Cycle? |
| A. | 2 reversible isotherms & 2 reversible adiabatics |
| B. | 1 reversible isotherms & 2 reversible adiabatics |
| C. | 2 reversible isotherms & 1 reversible adiabatics |
| D. | 1 reversible isotherms & 2 reversible adiabatics |
| Answer» B. 1 reversible isotherms & 2 reversible adiabatics | |
| 277. |
Which of the following diagrams are used while analyzing the effect of superheat & Inlet Pressure on mean temperature of heat addition? |
| A. | P-V diagram |
| B. | T-S diagram |
| C. | P-T diagram |
| D. | V-T diagram |
| Answer» C. P-T diagram | |
| 278. |
A Hydraulic Ram Pump is based on the principle of? |
| A. | Wind Hammer |
| B. | Water hammer |
| C. | Wind gushing |
| D. | None of the mentioned |
| Answer» C. Wind gushing | |
| 279. |
Pelton Wheel Turbine is suited for? |
| A. | high heads |
| B. | low heads |
| C. | medium heads |
| D. | zero heads |
| Answer» B. low heads | |
| 280. |
Most of the turbine expansion takes place in? |
| A. | Liquid Region |
| B. | Solid Region |
| C. | Vapour Region |
| D. | Plastic Region |
| Answer» D. Plastic Region | |
| 281. |
The maximum temperature of steam that can be used is fixed from metallurgical considerations. This temperature limit is called? |
| A. | Mining Limit |
| B. | Metallurgical Limit |
| C. | Metallic Limit |
| D. | None of the mentioned |
| Answer» C. Metallic Limit | |
| 282. |
PWR stands for? |
| A. | Pressurized Water Relator |
| B. | Pressurized Water Reheater |
| C. | Pressurized Water Reactor |
| D. | Pressurized Water Refractory |
| Answer» D. Pressurized Water Refractory | |
| 283. |
What is the effect of the increase in the superheat at constant pressure? |
| A. | Decreases cycle efficiency |
| B. | Increases mean temperature of heat addition |
| C. | Decreases mean temperature of heat addition |
| D. | None of the mentioned |
| Answer» C. Decreases mean temperature of heat addition | |
| 284. |
The saturation pressure corresponding to the minimum practicable temperature of heat rejection is a function of? |
| A. | Temperature of heat rejection |
| B. | Temperature of surroundings |
| C. | Mean temperature of heat addition |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 285. |
Mean Temperature of Heat Addition is the ratio of? |
| A. | Difference of temperatures to difference of entropies |
| B. | Difference of enthalpies to difference of entropies |
| C. | Difference of temperatures to difference of enthalpies |
| D. | Difference of entropies to difference of enthalpies. |
| Answer» C. Difference of temperatures to difference of enthalpies | |
| 286. |
Which of the following is not a component of Brayton cycle? |
| A. | Compressor |
| B. | Combustion Chamber |
| C. | Turbine |
| D. | Pump |
| Answer» E. | |
| 287. |
A Sterling engine uses an energy source whose temperature is 727°C and an energy sink whose temperature is 27°C. How much heat must be added to the engine to produce 1 unit of work? |
| A. | 1.10 |
| B. | 1.19 |
| C. | 1.43 |
| D. | 2.0 |
| Answer» D. 2.0 | |
| 288. |
The compression ratio is the ratio of? |
| A. | Swept volume to total volume |
| B. | Total volume to swept volume |
| C. | Total volume to clearance volume |
| D. | None of the mentioned |
| Answer» B. Total volume to swept volume | |
| 289. |
For the same maximum pressure and heat input, the most efficient cycle is? |
| A. | Brayton cycle |
| B. | Carnot cycle |
| C. | Rankine cycle |
| D. | Dual cycle |
| Answer» B. Carnot cycle | |
| 290. |
A simple Brayton cycle has a pressure ratio of 5 and a maximum temperature of 900 K. Air enters the compressor at 100 kPa, 300 K. Based upon cold-air standard analysis assumptions, the back-work ratio of this cycle is: |
| A. | 0.23 |
| B. | 0.53 |
| C. | 0.48 |
| D. | 0.36 |
| Answer» C. 0.48 | |
| 291. |
A simple Brayton cycle uses Helium as the working fluid, has a maximum temperature of 1000 K, and a pressure ratio of 4. At the start of the compression, the Helium pressure and temperature are 50 kPa and 250 K. Based upon cold-air standard analysis assumptions, the thermal efficiency of the cycle is: |
| A. | 0.13 |
| B. | 0.23 |
| C. | 0.43 |
| D. | 0.53 |
| Answer» E. | |
| 292. |
What is the maximum possible TIT(Turbine Inlet Temperature)? |
| A. | 1000 K |
| B. | 1500 K |
| C. | 950 K |
| D. | 1300 K |
| Answer» E. | |
| 293. |
What is the range of Thermal efficiency in Brayton cycle? |
| A. | 30-35% |
| B. | 40-45% |
| C. | 50-55% |
| D. | 50-60% |
| Answer» D. 50-60% | |
| 294. |
A gas turbine works on? |
| A. | Carnot cycle |
| B. | Brayton cycle |
| C. | Dual cycle |
| D. | Rankine cycle |
| Answer» C. Dual cycle | |
| 295. |
Which of these factors don’t cause Internal Irreversibility of a Rankine cycle? |
| A. | Throttling |
| B. | Throttling |
| C. | Fluid Friction |
| D. | Fluid flow |
| Answer» E. | |
| 296. |
Phase change at constant pressure takes place in? |
| A. | Economiser |
| B. | Evaporator |
| C. | Superheater |
| D. | Air-Preheater |
| Answer» D. Air-Preheater | |
| 297. |
In Rankine Cycle, water is converted to saturated liquid in ___________ |
| A. | Evaporator |
| B. | Economizer |
| C. | Superheater |
| D. | Preheater |
| Answer» C. Superheater | |
| 298. |
The most common type of Evaporator is? |
| A. | Flooded Evaporator |
| B. | Plate Evaporator |
| C. | Coil Evaporator |
| D. | Brine Evaporator |
| Answer» C. Coil Evaporator | |
| 299. |
Steam Power Plants are more popular in electric power generation because |
| A. | Work output of turbine is very large than work input to the pump |
| B. | Work output of turbine is very large than work input to the pump |
| C. | Work output of turbine is very small than work input to the pump |
| D. | Work output of turbine is equal to work input to the pump |
| Answer» B. Work output of turbine is very large than work input to the pump | |
| 300. |
Efficiency of a Rankine Cycle is also expressed as_________ |
| A. | Capacity Ratio |
| B. | Heat Rate |
| C. | Heat Ratio |
| D. | Steam Rate |
| Answer» C. Heat Ratio | |