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MCQOPTIONS
This section includes 2670 Mcqs, each offering curated multiple-choice questions to sharpen your Railways knowledge and support exam preparation. Choose a topic below to get started.
| 1201. |
In a turbo-jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in: |
| A. | Turbine blades, which is essentially an isentropic process. |
| B. | Turbine blades, which is polytropic process. |
| C. | Exit nozzle, which is essentially an isentropic process. |
| D. | Exit nozzle, which is a constant volume process. |
| Answer» B. Turbine blades, which is polytropic process. | |
| 1202. |
Consider the following statements: In open cycle turbo jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning more fuel is used to increase. 1. Thrust. 2. The efficiency of engine. 3. The range of aircraft. Of these statements: |
| A. | 1 and 3 are correct |
| B. | 1 and 2 are correct |
| C. | 2 and 3 are correct |
| D. | 1, 2 and 3 are correct. |
| Answer» C. 2 and 3 are correct | |
| 1203. |
In the context of performance evaluation of I.C. Engine, match List I with List II and select the correct answer List-I (Parameter) List-II (Equipment for measurement) A. Brake power(B.H.P.) 1. Bomb calorimeter B. Engine speed 2. Electrical tachometer C. Calorific value of fuel 3. Hydraulic dynamometer D. Exhaust emissions 4. Flame ionisation detector Codes: |
| A. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| B. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 |
| C. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| Answer» D. A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 | |
| 1204. |
Consider the following statements: I. The performance of an S.I. engine can be improved by increasing the compression ratio. II. Fuels of higher octane number can be employed at higher compression ratio. Of these statements |
| A. | Both I and II are true |
| B. | Both I and II are false |
| C. | I is true but II is false |
| D. | I is false but II is true |
| Answer» E. | |
| 1205. |
Compensating jet in carburettor supplies almost constant amount of petrol at all speeds because: |
| A. | The jet area is automatically varied depending on the suction. |
| B. | The flow from the main jet is diverted to the compensating jet with increase in speed. |
| C. | The diameter of the jet is constant and the discharge coefficient is invariant. |
| D. | The flow is produced due to the static heal in the float Chamber. |
| Answer» C. The diameter of the jet is constant and the discharge coefficient is invariant. | |
| 1206. |
Match List I with List II select the correct answer List-I (SI engine operating mode) List-II (Desired air-fuel ratio) A. Idling 1. 13.0 B. Cold starting 2. 4.0 C. Cruising 3. 16.0 D. Full throttle 4. 9.0 Codes: |
| A. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 |
| C. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| Answer» B. A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 | |
| 1207. |
Consider the following statements: The injector nozzle of a CI engine is required to inject fuel at a sufficiently high pressure in order to 1. be able to inject fuel in a chamber of high pressure at the end of the compression stroke. 2. Inject fuel at high velocity to facilitate atomization. 3. Ensure that penetration is not high. Of the above statements |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | 1, 2 and 4 are correct |
| Answer» B. 1 and 3 are correct | |
| 1208. |
Consider the following statements: Knock in the SI engine can be reduced by 1. Supercharging 2. Retarding the spark. 3. Using a fuel of long straight chain structure. 4. Increasing the engine speed. Of these statement: |
| A. | 1 and 2 are correct |
| B. | 2 and 3 are correct |
| C. | 1, 3 and 4 are correct |
| D. | 2 and 4 are correct |
| Answer» E. | |
| 1209. |
Which one of the following engines will have heavier flywheel than the remaining ones? |
| A. | 40 HP. four-stroke petrol engine running at 1500 rmp. |
| B. | 40 H.P. two-stroke petrol engine running at 1500 rmp. |
| C. | 40 H.P. two-stroke diesel engine running at 750 rmp. |
| D. | 40 H.P. four-stroke diesel engine running at 750 rmp. |
| Answer» E. | |
| 1210. |
List I gives the different terms related to combustion while List II gives the outcome of the events that follow. Match List I with List II and select the correct answer. List-I List-II A. Association 1. Pseudo shock B. Dissociation 2. Knock C. Flame front 3. Endothermic D. Abnormal combustion 4. Exothermic Codes: |
| A. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| B. | A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| Answer» E. | |
| 1211. |
In the Orsat flue gas analyser, ammonia Cal cuprous chloride is used to absorb: |
| A. | \[C{{O}_{2}}\] |
| B. | CO |
| C. | \[{{O}_{2}}\] |
| D. | \[{{N}_{2}}\] |
| Answer» C. \[{{O}_{2}}\] | |
| 1212. |
Propulsion efficiency of a jet engine is given by(where u is flight velocity and V is jet velocity relative to aircraft): |
| A. | \[\text{2}\,\text{u/}\left( \text{V}\,\,-\,\,\text{u} \right)\] |
| B. | \[\left( \text{V}\,\,\text{+}\,\,\text{u} \right)\text{/2}\,\text{u}\] |
| C. | \[\text{2}\,\text{u/}\left( \text{V}\,\,\text{+}\,\,\text{u} \right)\] |
| D. | \[\left( \text{V}\,\,-\,\,\text{u} \right)\text{/2}\,\text{u}\] |
| Answer» D. \[\left( \text{V}\,\,-\,\,\text{u} \right)\text{/2}\,\text{u}\] | |
| 1213. |
Consider the following statements: As compared to turboprop, a turbojet 1. Can operate at higher altitudes 2. Can operate at higher flight velocities 3. Is more fuel efficient at lower speeds Of these statements: |
| A. | 1, 2 and 3 are correct |
| B. | 1 and 2 are correct |
| C. | 2 and 3 are correct |
| D. | 1 and 3 are correct. |
| Answer» C. 2 and 3 are correct | |
| 1214. |
The method of determination of indicated power of multi-cylinder SI engine is by the use of: |
| A. | Morse test |
| B. | Prony brake test |
| C. | Motorist test |
| D. | Heat balance test |
| Answer» B. Prony brake test | |
| 1215. |
For a typical automobile C.I engine, for conditions of increasing engine speed match List I with List II and select the correct answer using codes given below the lists: List-I (Performance parameter) List-II (Tendency, qualitatively) A. Power output 1. Increasing and then decreasing B. Torque 2. Decreasing and then increasing C. Brake specific fuel consumption 3. Increasing throughout the range 4. Decreasing throughout the range Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]4, C\[\to \]3 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]2 |
| Answer» E. | |
| 1216. |
Keeping other parameters constant brake power diesel engine can he increased by: |
| A. | Decreasing the density of intake air |
| B. | Increasing the temperature of intake air |
| C. | Increasing the pressure of intake air |
| D. | Decreasing the pressure of intake air. |
| Answer» D. Decreasing the pressure of intake air. | |
| 1217. |
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic type of IC engines is: |
| A. | 4 stroke CI engine, 4 stroke SI engine. 2 stroke SI engine |
| B. | 4 stroke SI engine, 4 stroke CI engine, 2 stroke SI engine |
| C. | 4 stroke CI engine, 2 stroke SI engine. 4 stroke SI engine |
| D. | 2 stroke SI engine, 4 stroke SI engine, 4 stroke CI engine. |
| Answer» B. 4 stroke SI engine, 4 stroke CI engine, 2 stroke SI engine | |
| 1218. |
Use of hermetically sealed compressor in a vapour compression refrigeration system results in: |
| A. | Decrease in energy consumption |
| B. | Increase in energy consumption |
| C. | Increase in COP |
| D. | Increase in pressure ratio |
| Answer» B. Increase in energy consumption | |
| 1219. |
Witch of the following factors would increase the probability of knock in the CI engines? 1. Long ignition delay of fuel 2. Low self-ignition temperature of fuel 3. Low volatility of fuel Select the correct answer using the codes given below: Codes: |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» C. 1 and 3 | |
| 1220. |
By higher octane number of SI fuel, it is meant that the fuel has: |
| A. | Higher heating value |
| B. | Higher flash point |
| C. | Lower volatility |
| D. | Longer ignition delay |
| Answer» E. | |
| 1221. |
Match List I with List II, in respect of SI engines, and select the correct answer by using given below the list: List-I List-II A. Highest useful compression ratio 1. Ignitable mixture B. Dopes 2. Knock rating, of fuels C. Limiting mixture strength 3. Detonation D. Delay period 4. Chain of chemical reactions in combustion chamber Codes: |
| A. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| Answer» C. A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 | |
| 1222. |
The two reference fuels used for cetane rating are: |
| A. | Cetane and isooctane |
| B. | Cetane and tetraethyl lead |
| C. | Cetane and n-heptane |
| D. | Cetane and a-methyl naphthalene. |
| Answer» E. | |
| 1223. |
Knocking in the SI engine decreases in which one of the following orders of combustion chamber designs? |
| A. | F head, L head, I head |
| B. | T head, L head, F head |
| C. | I head, T head, F head |
| D. | F head, I head, T head. |
| Answer» B. T head, L head, F head | |
| 1224. |
A gas engine has a swept volume of 300 cc and clearance volume of 25 cc. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. What is the volume of the mixture taken in per Stroke? |
| A. | 248 cc |
| B. | 252 cc |
| C. | 264 cc |
| D. | 286 cc |
| Answer» D. 286 cc | |
| 1225. |
Match List I with List II and select the correct answer using the codes given below the lists: List-I (Operating mode of SI engine) List-II (Appropriate air-fuel ratio) A. Idling 1. 125 B. Cold starting 2. 9.0 C. Cruising 3. 16.0 D Maximum power 4. 22.0 5. 3.0 Codes: |
| A. | A\[\to \]2, B\[\to \]4, C\[\to \]5, D\[\to \]1 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]2 |
| C. | A\[\to \]5, B\[\to \]2, C\[\to \]1, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]5, C\[\to \]3, D\[\to \]1 |
| Answer» E. | |
| 1226. |
Besides mean effective pressure, the data needed for determining the indicated power of an engine would include: |
| A. | Piston diameter, length of stroke and calorific value of fuel |
| B. | Piston diameter, specific fuel consumption and calorific value of fuel |
| C. | Piston diameter, length of stroke and speed of rotation |
| D. | Specific fuel consumption, speed of rotation and torque |
| Answer» D. Specific fuel consumption, speed of rotation and torque | |
| 1227. |
Match List I with List II in respect of a chemical rocket engine and select the correct answer using the codes given below the List: List-I List-II A. Ethyl alcohol 1. Liquid oxidizer B. Nitrocellulose 2. Liquid fuel C. Ammonium perchlorate 3. Solid oxidizer D. Hydrogen peroxide 4. Solid fuel Codes: |
| A. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| B. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| C. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| D. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| Answer» D. A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 | |
| 1228. |
If V is the jet velocity Vo is the Vehicle velocity, the propulsive efficiency of a rocket is given by: |
| A. | \[\frac{2\,\left( {{\text{V}}_{\text{0}}}\text{/}{{\text{V}}_{\text{1}}} \right)}{1+\left( \frac{{{V}_{0}}}{{{V}_{1}}} \right)}\] |
| B. | \[\frac{\left( {{\text{V}}_{\text{0}}}\text{/}{{\text{V}}_{\text{1}}} \right)}{1+{{\left( \frac{{{V}_{0}}}{{{V}_{1}}} \right)}^{2}}}\] |
| C. | \[\frac{{{V}_{0}}}{{{V}_{0}}+{{V}_{1}}}\] |
| D. | \[\frac{{{V}_{1}}}{{{V}_{0}}+{{V}_{1}}}\] |
| Answer» B. \[\frac{\left( {{\text{V}}_{\text{0}}}\text{/}{{\text{V}}_{\text{1}}} \right)}{1+{{\left( \frac{{{V}_{0}}}{{{V}_{1}}} \right)}^{2}}}\] | |
| 1229. |
Excessive pressure drop in liquid line in a refrigerating system causes: |
| A. | High condenser pressure |
| B. | Flashing of the liquid refrigerant |
| C. | Higher evaporator pressure |
| D. | Under cooling of the liquid refrigerant |
| Answer» E. | |
| 1230. |
Which one of following quantities is assumed constant for an internal combustion engine while estimating its friction power by extrapolation through Willan's line? |
| A. | Brake thermal efficiency |
| B. | Indicated thermal efficiency |
| C. | Mechanical efficiency |
| D. | Volumetric efficiency |
| Answer» C. Mechanical efficiency | |
| 1231. |
An automatic expansion valve is required to maintain constant: |
| A. | Pressure in the evaporator |
| B. | Temperature in the freezer |
| C. | Pressure in the liquid line |
| D. | Temperature in the condenser |
| Answer» E. | |
| 1232. |
If the approximate average mean pressures during induction, compression, power and exhaust strokes of an internal combustion engine are respectively \[\text{15}\,\,\text{k}\,\text{N/}{{\text{m}}^{\text{2}}}\] below atmosphere 200\[k\,\text{N/m}\] above atmosphere, \[\text{1000}\,\,\text{k}\,\text{N/}{{\text{m}}^{\text{2}}}\] above atmosphere and \[20\,\,\text{N/}{{\text{m}}^{\text{2}}}\] above atmosphere, then the resultant mean effective pressure, in \[k\,\text{N/}{{\text{m}}^{\text{2}}},\] is: |
| A. | 765 |
| B. | 795 |
| C. | 800 |
| D. | 805 |
| Answer» B. 795 | |
| 1233. |
Generally, in Bosch type fuel injection pumps, the quantity of fuel is increased or decreased with change in load, due to change in: |
| A. | Timing of start of fuel injection |
| B. | Timing of end fuel injection |
| C. | Injection pressure of fuel |
| D. | Velocity of flow of fuel |
| Answer» C. Injection pressure of fuel | |
| 1234. |
Match List I with List II and select the correct answer using the codes given below the Lists: List-I (Operating condition) List-II (Approximate air fuel ratio) A. Idling 1. 16 B. Part load operation 2. 10 C. Full load 3. 12.5 D. Cold start 4. 3 Codes: |
| A. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| D. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| Answer» B. A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 | |
| 1235. |
Consider the following measures: 1. Increasing the compression ratio. 2. Increasing the intake air temperature. 3. Increasing the length to diameter ratio of the cylinder. 4. Increasing the engine speed. The measures necessary to reduce the tendency to knock in CI engines would include: |
| A. | 1, 2 and 3 |
| B. | 1, 2 and 4 |
| C. | 1, 3 and 4 |
| D. | 2, 3 and 4 |
| Answer» C. 1, 3 and 4 | |
| 1236. |
Reference fuels for knock rating of SI engine fuels would include: |
| A. | Iso-octane and alpha-methyl naphthalene. |
| B. | Normal octane and aniline |
| C. | Iso-octane and n-hexane |
| D. | n-heptane and is-octane |
| Answer» E. | |
| 1237. |
Match List I with List II and select the correct answer using the codes given below the lists: List-I (S.I. Engine Problem) List-II (Characteristic of fuel responsible for the problem) A. Cold starting 1. Front end volatility B. Carburettor icing 2. Mid-range volatility C. Crankcase dilutions 3. Tail end volatility Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]2 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]2 |
| Answer» B. A\[\to \]1, B\[\to \]3, C\[\to \]2 | |
| 1238. |
Which of the following factors increase detonation in the SI engine? 1. Increase spark advance. 2. Increased speed. 3. Increased air-fuel ratio beyond stoichiometric strength. 4. Increased compression ratio. Select the correct answer using the codes given below: Codes: |
| A. | 1 and 3 |
| B. | 2 and 4 |
| C. | 1, 2 and 4 |
| D. | 1 and 4 |
| Answer» E. | |
| 1239. |
Consider the following statements comparing I.C. engines and gas turbines: 1. Gas turbines are simple, compact and light in weight. 2. Complete expansion of working substance is possible in I.C. engines and not in gas turbines. 3. There is flexibility in the design of different components of gas turbines as different processes take place in different components. 4. Even low grade fuels can be burnt in gas turbines. Of these statement: |
| A. | 1, 2 and 3 are correct |
| B. | 1, 3 and 4 and correct |
| C. | 2, 3 and 4 are correct |
| D. | 1, 2 and 4 are correct |
| Answer» B. 1, 3 and 4 and correct | |
| 1240. |
Match List I with List II and select the correct answer using the codes given below the lists: List-I List-II A. Pre-combustion chamber 1. Compression swirl B. Turbulent chamber 2. Masked inlet valve C. Open combustion chamber 3. Spark ignition D. F-head combustion chamber 4. Combustion induced swirl 5. M-chamber Codes: |
| A. | A\[\to \]4, B\[\to \]5, C\[\to \]3, D\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]5, D\[\to \]2 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]5 |
| D. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| Answer» B. A\[\to \]1, B\[\to \]3, C\[\to \]5, D\[\to \]2 | |
| 1241. |
The essential function of the carburettor in a spark ignition engine is to: |
| A. | Meter the fuel into air stream and amount dictated by the load and speed |
| B. | Bring about mixing of air and fuel to get a homogeneous mixture |
| C. | Vaporize the fuel |
| D. | Distribute fuel uniformly to all cylinders in a multi-cylinder engine and also vaporize it. |
| Answer» B. Bring about mixing of air and fuel to get a homogeneous mixture | |
| 1242. |
Which of the following statements is "true"? |
| A. | The term "KNOCK" is used for on identical phenomenon in a spark ignition and compression ignition engine |
| B. | "KNOCK" is a term associated with a phenomeno a taking place in the early part of combustion in a spark ignition engine |
| C. | "KNOCK" is a term associated with a phenomenon taking place in the early part of combustion in a spark ignition engine and the later part of combustion in a compression ignition engine |
| D. | None of the above |
| Answer» B. "KNOCK" is a term associated with a phenomeno a taking place in the early part of combustion in a spark ignition engine | |
| 1243. |
The air fuel ratio for idling speed of an automobile petrol engine is closer to: |
| A. | 0.417361111111111 |
| B. | 0.625694444444444 |
| C. | 0.709027777777778 |
| D. | 0.875694444444444 |
| Answer» B. 0.625694444444444 | |
| 1244. |
A turbo prop is preferred to turbo jet because: |
| A. | It has high propulsive efficiency at high speeds |
| B. | It can fly at supersonic speeds |
| C. | It can fly at high elevations |
| D. | It has high power for take off |
| Answer» E. | |
| 1245. |
The refrigerant used for absorption refrigerators working heat from solar collectors is mixture of water and : |
| A. | Carbon dioxide |
| B. | Sulphur dioxide |
| C. | Lithium bromide |
| D. | Freon 12 |
| Answer» D. Freon 12 | |
| 1246. |
In solid propellants rockets, ammonium picrate is usually added as: |
| A. | An additive |
| B. | An inhibitor |
| C. | A darkening agent |
| D. | a plasticizer |
| Answer» B. An inhibitor | |
| 1247. |
The most commonly used method for the design of duct size is the: |
| A. | Velocity reduction method |
| B. | Equal friction method |
| C. | Static regain method. |
| D. | Dual or double dust method. |
| Answer» B. Equal friction method | |
| 1248. |
Consider the following statements: 1. Practically all common refrigerants have approximately the same COP and power requirement. 2. Ammonia mixes freely with lubricating oil and this helps lubrication of compressors. 3. Dielectric strength of refrigerants is an important property in hermetically sealed compressor units. 4. Leakage of ammonia can detected by halide torch method. Of these statements |
| A. | 1, 2, and 4 are correct |
| B. | 2 and 4 are correct |
| C. | 1, 3 and 4 are correct |
| D. | 1 and 3 are correct |
| Answer» E. | |
| 1249. |
A spherical drop of molten metal of radius 2 mm was found to solidify in 10 seconds. A similar drop of radius 4 mm would solidify in: |
| A. | 14.14 second |
| B. | 20 seconds |
| C. | 18.30 second |
| D. | 40 seconds |
| Answer» E. | |
| 1250. |
2000 cc. of air takes \[1{\scriptstyle{}^{1}/{}_{2}}\] minutes to pass through a standard Specimen of sand (5.08 cm high and 5.08 cm in dia.). The manometer indicates pressure as \[5\,\,\text{g/c}{{\text{m}}^{\text{2}}}\text{.}\] In this case the permeability number is: |
| A. | 30 |
| B. | 42 |
| C. | 51 |
| D. | 67 |
| Answer» E. | |