McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 251. |
Which of the following compound is present in natural gas? |
| A. | urea |
| B. | benzoyl peroxide |
| C. | methane |
| D. | sulphonic acid |
| Answer» C. methane | |
| Explanation: natural gas is mainly composed of methane and small quantities of ethane and other hydrocarbons. urea consists of nitrogen due to which it is not present in natural gas. | |
| 252. |
Which type of natural gas is called wet natural gas? |
| A. | containing lower hydrocarbon with more ethane |
| B. | containing higher hydrocarbon with more ethane |
| C. | containing lower hydrocarbon with more methane |
| D. | containing higher hydrocarbon with more methane |
| Answer» D. containing higher hydrocarbon with more methane | |
| Explanation: if higher hydrocarbons are present along with methane, then the natural gas is called “rich” or “wet” natural gas. it is also called “marsh gas” because it majorly contains methane. | |
| 253. |
Which of the following natural gas has the highest ignition temperature? |
| A. | natural gas obtained from oil fields |
| B. | natural gas obtained from coal fields |
| C. | natural gas obtained from rocks |
| D. | natural gas obtained from sea |
| Answer» C. natural gas obtained from rocks | |
| Explanation: the natural gas produced from rocks by the diffusion of oil constituents a gas field that may be under high pressure. due to this high pressure, the flow potential of gas increase, which produces static electricity and increases the ignition temperature which is hazardous for us. | |
| 254. |
How much percentile of propane is present in natural gas? |
| A. | 5.5 % |
| B. | 3.7 % |
| C. | 1.8 % |
| D. | 0.5 % |
| Answer» B. 3.7 % | |
| Explanation: at an average 88.5 % of methane is present in natural gas. 5.5 % of ethane, 3.7 % of propane and 1.8 % of butane are present in natural gas. the higher hydrocarbons are present at about 0.5 %. | |
| 255. |
H2S is not present in natural gas. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: h2s is present in small quantity in natural gas. if it is present in an appreciable amount, then it is called as “sour” natural | |
| 256. |
Which of the following process is used to recover vapours of liquid hydrocarbons in wet natural gas? |
| A. | evaporation |
| B. | distillation |
| C. | cracking |
| D. | adsorption |
| Answer» D. adsorption | |
| Explanation: the vapours of liquid hydrocarbons can be recovered by condensation, absorption in oil and by adsorption on charcoal, silica or alumina gel. the liquid so recovered is called casinghead gasoline. | |
| 257. |
Gaseous fuel is most suited for IC engine since physical delay is almost |
| A. | zero |
| B. | more |
| C. | less |
| D. | none of the mentioned |
| Answer» A. zero | |
| Explanation: as compared to other fuels there is almost no delay in gaseous fuel and for this purpose it is preferred the most. | |
| 258. |
Advantage of hydrogen as an IC engine fuel |
| A. | high volumetric efficiency |
| B. | low fuel cost |
| C. | no hc and co emissions |
| D. | none of the mentioned |
| Answer» C. no hc and co emissions | |
| Explanation: the main advantage of hydrogen as an ic engine fuel is that there is no hc and co emissions. | |
| 259. |
Major constituent of natural gas is |
| A. | ethane |
| B. | methane |
| C. | butane |
| D. | propane |
| Answer» B. methane | |
| Explanation: only methane is the major constituent of natural gas. | |
| 260. |
At normal ambient temperature and atmospheric pressure, in which form LPG is obtained? |
| A. | solid |
| B. | gaseous |
| C. | liquid |
| D. | solid-liquid |
| Answer» B. gaseous | |
| Explanation: lpg is a certain mixture of light hydrocarbons derived from petroleum. at normal temperature and pressure it is in gaseous state and later on it is condensed to the liquid state by the application of moderate pressure. | |
| 261. |
Under which compound name does the liquid petroleum gas (LPG) are sold? |
| A. | urea |
| B. | ethylene |
| C. | benzoyl peroxide |
| D. | butane |
| Answer» D. butane | |
| Explanation: propane and butane are present in the largest amounts in lpg. small quantities of ethane, pentane, ethylene and pentene are also present. under trade names it is represented as hp, bharat gas and indian gas in india. | |
| 262. |
By which process only saturated hydrocarbons are obtained in LPG? |
| A. | straight distillation |
| B. | thermal cracking |
| C. | hydrocracking |
| D. | reforming |
| Answer» A. straight distillation | |
| Explanation: the lpg obtained from heavier hydrocarbons by straight distillation process only contains saturated hydrocarbons, where as the lpg obtained from thermal cracking or hydrocracking contains both saturated and unsaturated hydrocarbons. | |
| 263. |
Which type of LPG is mostly produced in Indian refineries? |
| A. | grade a |
| B. | grade b |
| C. | grade c |
| D. | grade d |
| Answer» B. grade b | |
| Explanation: according to the bureau of indian standards, grade b contains a mixture of butane and propane. this type of lpg are supplied for domestic uses. | |
| 264. |
According to the Bureau of Indian Standards which type of LPG only contains butane in them? |
| A. | grade a |
| B. | grade b |
| C. | grade c |
| D. | grade d |
| Answer» A. grade a | |
| Explanation: grade a consist predominantly of butanes, butylene or mixture of butanes and butylene’s. this type of lpg are most suitable for use due to their moderate rate of combustion. | |
| 265. |
In which regions does the LPG containing propane are found? |
| A. | hotter region |
| B. | monsoon region |
| C. | colder region |
| D. | terrestrial region |
| Answer» C. colder region | |
| Explanation: lpg containing propane is found in the colder region due to less temperature and pressure conditions. these are found towards the north pole of the earth. | |
| 266. |
Liquid petroleum gas (LPG) is corrosive to steel. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: the sulphur and phosphorous content in lpg are very low due to which these are non-corrosive to steel. this type of fuel is used in industries having large steel supplies. | |
| 267. |
What happens when LPG is inhaled in large concentrations? |
| A. | it kills a person |
| B. | it increases a person’s eye sight |
| C. | it does not have any effect on person’s health |
| D. | it causes a little anaesthesia |
| Answer» D. it causes a little anaesthesia | |
| Explanation: butane and propane are present in large amount are lpg. if inhaled in large quantities, it becomes anaesthetic which can cause a person to fall after some time. | |
| 268. |
What is the odour of Liquid Petroleum Gas (LPG)? |
| A. | it is odourless |
| B. | fruity smell |
| C. | undesirable odour |
| D. | alcoholic smell |
| Answer» A. it is odourless | |
| Explanation: lpg does not have a characteristic odour. highly odorous compounds such as ethyl and propyl merchants are deliberately mixed so as to | |
| 269. |
In which type of industries LPG is used as a fuel? |
| A. | steel industries |
| B. | plastic industries |
| C. | in the production of olefins |
| D. | in the production of coal gas |
| Answer» C. in the production of olefins | |
| Explanation: lpg is used as a feedstock for the manufacturing of olefins by the process of pyrolysis. it is also used as a domestic fuel for internal combustion engines. | |
| 270. |
Power alcohols contains |
| A. | 50-60% of petrol |
| B. | 70-80% of petrol |
| C. | 50-60% of ethanol |
| D. | 70-80% of ethanol |
| Answer» B. 70-80% of petrol | |
| Explanation: when ethyl alcohol is used in internal combustion engines then it is called as power. so, it contains 70-80% of petrol and 20-25% of ethanol. | |
| 271. |
Alcohol can absorb |
| A. | traces of water |
| B. | traces of impurities |
| C. | traces of dust |
| D. | traces of carbon |
| Answer» A. traces of water | |
| Explanation: alcohol has the power to absorb the traces of water present in petrol as it dissolves in water. | |
| 272. |
Ethyl alcohol reduces the |
| A. | oxygen emissions |
| B. | efficiency |
| C. | polluting emissions |
| D. | nitrogen emissions |
| Answer» C. polluting emissions | |
| Explanation: ethyl alcohol contains nascent oxygen atoms that reduce the pollutants like co and other hydro carbons. | |
| 273. |
Power alcohol is than petrol. |
| A. | bad product |
| B. | less efficient |
| C. | costlier |
| D. | cheaper |
| Answer» D. cheaper | |
| Explanation: power alcohol is cheaper than petrol. it is the main advantage of the power alcohols made them to be fuels. | |
| 274. |
Main disadvantage of the power alcohol is |
| A. | starting troubles |
| B. | more cost |
| C. | increases foreign currency |
| D. | increases octane number of petrol |
| Answer» A. starting troubles | |
| Explanation: the main disadvantages of the power alcohols are starting troubles due to the high surface tension and atomization. | |
| 275. |
What is the colour of the bio diesel? |
| A. | orange |
| B. | light yellow |
| C. | dark orange |
| D. | light brown |
| Answer» B. light yellow | |
| Explanation: the bio diesel is light yellow in colour. most of the power alcohols are yellow in colour as they are hydrocarbons. | |
| 276. |
Natural gas contains |
| A. | methane=70-90% |
| B. | benzene=40-30% |
| C. | hydrogen=50% |
| D. | methane=80-40% |
| Answer» A. methane=70-90% | |
| Explanation: the composition of natural gas is: methane=70-90%; benzene=5-10%; co+carbon dioxide=remainder. | |
| 277. |
The calorific value of LPG is |
| A. | 34800kcal/m3 |
| B. | 84000kcal/m3 |
| C. | 278000kcal/m3 |
| D. | 29000kcal/m3 |
| Answer» C. 278000kcal/m3 | |
| Explanation: the calorific value of the lpg is more than that of the natural gas. it is about 278000kcal/m3. so, it is more efficient than the natural gas. | |
| 278. |
Boiling point of LPG is |
| A. | 546k |
| B. | 373k |
| C. | above room temperature |
| D. | below room temperature |
| Answer» D. below room temperature | |
| Explanation: lpg has the property of fast ignition and it needs very less amount of energy to burn that is the heat supplied is very low about the temperature less than that if room temperature. | |
| 279. |
CNG has high auto-ignition temperature of |
| A. | 813k |
| B. | 993k |
| C. | 1163k |
| D. | 1273k |
| Answer» A. 813k | |
| Explanation: cng also have high auto ignition energy and has a calorific value of 900 kj/mole. its auto ignition temperature is about 813k. | |
| 280. |
To calculate HCV of the fuel, the products of combustion are cooled down to |
| A. | 600f |
| B. | 700f |
| C. | 400f |
| D. | 200f |
| Answer» A. 600f | |
| Explanation: the products of combustion are cooled down to 600f or 150c that is room temperature. the hydrogen gas gets converted into steam. | |
| 281. |
When the coal is completely burnt in air, then the maximum temperature reached is called |
| A. | calorific value of coal |
| B. | gross calorific value |
| C. | calorific intensity of coal |
| D. | net calorific value |
| Answer» C. calorific intensity of coal | |
| Explanation: calorific value of coal is defined as the amount of heat liberated during combustion of fuel completely. gross calorific value or hcv means the total heat liberated after combustion of fuel and | |
| 282. |
The Bomb calorimeter is used to determine the calorific value of |
| A. | solids and liquid fuels |
| B. | solid and gaseous fuels |
| C. | liquid fuels that can be easily vaporized |
| D. | solid fuels only |
| Answer» A. solids and liquid fuels | |
| Explanation: in bomb calorimeter, we can find the calorific value of both solid and gas fuels. in boy’s calorimeter we can fin calorific value for gaseous and easily vaporized liquid fuels. | |
| 283. |
Which of the following fuel gas will have the highest calorific value? |
| A. | water gas |
| B. | bio gas |
| C. | producer gas |
| D. | natural gas |
| Answer» D. natural gas | |
| Explanation: natural gas produces a high amount of heat when compared to the other three gases. water gas and producer gas are synthetic fuels and natural gas natural fuel. | |
| 284. |
On which property of fuel it’s calorific value is based? |
| A. | specific heat |
| B. | efficiency |
| C. | cost |
| D. | ignition temperature |
| Answer» B. efficiency | |
| Explanation: the calorific value is the total amount of heat liberated by complete combustion a unit amount of fuel, which is the total efficiency of the fuel. | |
| 285. |
What is the unit of calorific value in fps(foot pound sec)? |
| A. | gram calorie (g cal) |
| B. | pound calorie |
| C. | british thermal unit/ft3 |
| D. | calorie/gram2 |
| Answer» B. pound calorie | |
| Explanation: b.t.u. is the amount of heat required to rise the temperature of 1 lb of water through 1 0f. centigrade heat unit (chu) can also be used in fps system. | |
| 286. |
At how much temperature does the products of combustion should be cooled down to get Gross Calorific Value? |
| A. | 288 k |
| B. | 315 k |
| C. | 390 k |
| D. | 350 k |
| Answer» A. 288 k | |
| Explanation: at 288 k the products are cooled down, so as to get exact gross calorific value. it can be cooled down till room temperature. | |
| 287. |
What happens to the hydrogen present in fuel for calculating gross calorific value? |
| A. | it combines with carbon to form methane |
| B. | it combines with chlorine to form hydrochloric acid |
| C. | it combines with oxygen to form hydrogen per oxide |
| D. | it gets converted into steam |
| Answer» D. it gets converted into steam | |
| Explanation: after combustion of hydrogen, it gets converted into water vapour which then settles down as steam. after this process the products of combustion are cooled down. | |
| 288. |
How does the latent heat of condensation is included in gross calorific value? |
| A. | by the steam produced by the combustion of hydrogen |
| B. | by the combustion of products other than carbon and hydrogen |
| C. | by the combustion of carbon |
| D. | by the total heat produced in the system |
| Answer» A. by the steam produced by the combustion of hydrogen | |
| Explanation: the steam generated after combustion gets condensed into water and latent heat is evolved. the latent heat so liberated is included in gross calorific value. | |
| 289. |
Net Calorific Value is greater than Gross Calorific Value. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: ncv = [gcv – 0.09%h×587] cal/gm, since both gcv and % h are positive the value of ncv will be less than gcv. | |
| 290. |
Which of the following properties a good fuel should have? |
| A. | low calorific value |
| B. | moderate calorific value |
| C. | high calorific value |
| D. | high ignition temperature |
| Answer» C. high calorific value | |
| Explanation: calorific value is the total amount of heat liberated by complete combustion of fuel, therefore the more the calorific value will be, the good the fuel will be. | |
| 291. |
Which of the fuel has the highest calorific value? |
| A. | butane |
| B. | wood |
| C. | kerosene |
| D. | natural gas |
| Answer» A. butane | |
| Explanation: the calorific value of butane is 118 mj/kg, this is due to the saturation of carbon bonding in butane, where as the calorific value of wood is lowest which is 16 mj/kg. | |
| 292. |
How should be the ignition temperature of an ideal fuel? |
| A. | moderate |
| B. | low |
| C. | very low |
| D. | very high |
| Answer» A. moderate | |
| Explanation: the lowest temperature to which the fuel must be preheated so that it starts burning smoothly is called ignition temperature. low ignition temperature can cause fire hazards during storage and transportation of fuel. in case of high ignition temperature, there might be some difficulty during ignition of fuel. so, an ideal fuel should have moderate ignition temperature. | |
| 293. |
Fuel should have low moisture content. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: moisture if present in the fuel, reduces the heating value of the fuel. this ultimately leads to loss of money as moisture is paid at the same rate as that of fuel. hence, | |
| 294. |
In which type of fuel given below, risk of fire hazard is greatest? |
| A. | solid fuel |
| B. | gaseous fuel |
| C. | liquid fuel |
| D. | peat |
| Answer» B. gaseous fuel | |
| Explanation: risk of fire hazards in gaseous fuel is very high because these fuels are highly inflammable. peat is a type of solid fuel. | |
| 295. |
is easy in terms of storage. |
| A. | solid fuel |
| B. | liquid fuel |
| C. | gaseous fuel |
| D. | natural gas |
| Answer» A. solid fuel | |
| Explanation: solid fuel is easy to store. liquid fuel should be stored in closed containers only. gaseous fuel must be stored in leak proof storage tanks. natural gas is a type of gaseous fuel. | |
| 296. |
Rate of combustion should be |
| A. | very rapid |
| B. | moderate |
| C. | slow |
| D. | very slow |
| Answer» B. moderate | |
| Explanation: if the rate of combustion is low, then a part of heat liberated may get radiated instead of raising the temperature. if combustion rate is too high, reaction gets out of control. so, good fuel should have moderate rate of combustion. | |
| 297. |
Handling cost of solid fuel is high compared to liquid and gaseous fuel. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: handling cost of solid fuel is high because labour is required in their storage, transport, etc. whereas liquid and gaseous fuel can be easily transported through pipes. | |
| 298. |
The lowest temperature to which the fuel must be preheated so that it starts burning smoothly is called temperature. |
| A. | ignition |
| B. | combustion |
| C. | boiling point of fuel |
| D. | preheating |
| Answer» A. ignition | |
| Explanation: the lowest temperature to which the fuel must be preheated so that it starts burning smoothly is called ignition temperature. an ideal fuel should have moderate ignition temperature. | |
| 299. |
Which of the following fuel cannot be used in the internal combustion engine? |
| A. | gasoline |
| B. | diesel |
| C. | fuel oil |
| D. | anthracite coal |
| Answer» D. anthracite coal | |
| Explanation: anthracite is a type of solid fuel. it is not possible to use solid fuel in internal combustion engine. only liquid or gaseous fuels are possible to be used in the internal combustion engine. | |
| 300. |
In which of the following, smoke is produced maximum? |
| A. | solid fuel |
| B. | liquid fuel |
| C. | gaseous fuel |
| D. | coal gas |
| Answer» A. solid fuel | |
| Explanation: in solid fuel, smoke is invariably produced. in liquid fuel burning is clean however high carbon and aromatic | |
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