McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 251. |
Magneto ignition system is used in scooters and motor cycles because |
| A. | it is less costly |
| B. | it is less bulky and requires less maintenance |
| C. | it gives higher voltage across the terminals of spark plug |
| D. | none of the above |
| E. | None of the above |
| Answer» B. it is less bulky and requires less maintenance | |
| 252. |
In case of automobile moving under normal road conditions the amount of fuel injected is proportional to |
| A. | speed of vehicle |
| B. | square of speed of vehicle |
| C. | square root of speed of vehicle |
| D. | none of the above |
| E. | None of the above |
| Answer» A. speed of vehicle | |
| 253. |
As a general rule if facing on the friction disc are worn down to the rivet heads |
| A. | The clutch should be replaced |
| B. | The linkage should be adjusted |
| C. | Rivets head should be filed |
| D. | Rivets should be replaced |
| E. | The friction disc should be replaced |
| Answer» E. The friction disc should be replaced | |
| 254. |
The disadvantage of stratified charge engine is |
| A. | reduced power for a given engine size |
| B. | higher weight for bhp |
| C. | poor reliability |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 255. |
The device which is used for atomising and vapourising the petrol fuel and mixing it with the air in varying proportions, to suit the changing operating conditions of the engine, is known as |
| A. | injector |
| B. | Spark plug |
| C. | carburettor |
| D. | none of the above |
| E. | None of the above |
| Answer» C. carburettor | |
| 256. |
As the gap between the electrodes of the spark plug increases |
| A. | spark intensity increases |
| B. | voltage required for sparking increases |
| C. | voltage required for sparking decreases |
| D. | frequency of sparking increases |
| E. | None of the above |
| Answer» B. voltage required for sparking increases | |
| 257. |
In order to easily start the precombustion chamber diesel engine, in the early cold morning |
| A. | Spark plug is used |
| B. | Injector is used |
| C. | Glow plug is used |
| D. | Petrol is poured through inlet manifold |
| E. | None of the above |
| Answer» C. Glow plug is used | |
| 258. |
Pick up the wrong statement |
| A. | Theoretically correct air fuel mixture for petrol engine is about 1.5 : 1 |
| B. | Diesel engines are CI engines |
| C. | SI engines are quality governed engines |
| D. | High speed compression engines operate on dual combustion cycle |
| E. | Thermal efficiency of diesel engine is about 34% |
| Answer» C. SI engines are quality governed engines | |
| 259. |
While starting a engine the starter pinion meshes with |
| A. | Gears in differential |
| B. | Engine flywheel ring gear |
| C. | Clutch |
| D. | Gears in gear box |
| E. | Propellor shaft |
| Answer» B. Engine flywheel ring gear | |
| 260. |
The efficiency of mechanical brakes is usually |
| A. | 85 - 95 percent |
| B. | 60 - 70 percent |
| C. | 30 - 40 percent |
| D. | 99 percent |
| E. | 95 - 98 percent |
| Answer» B. 60 - 70 percent | |
| 261. |
Engine dynamo is usually driven by |
| A. | V-belt drive |
| B. | Gear drive |
| C. | Chain drive |
| D. | P-I-V drive |
| E. | Flat belt drive |
| Answer» A. V-belt drive | |
| 262. |
In actual practice, the inlet value of a four stroke I.C. engine should open |
| A. | exactly at the start of suction stroke |
| B. | slightly after the start of suction stroke |
| C. | slightly before the start of the suction stroke |
| D. | none of the above |
| E. | None of the above |
| Answer» C. slightly before the start of the suction stroke | |
| 263. |
Gudgeon pins are made of |
| A. | White metal |
| B. | Hardened and ground steel |
| C. | Aluminium |
| D. | Cast iron |
| E. | Same material as that of piston |
| Answer» B. Hardened and ground steel | |
| 264. |
In a four stroke four cylinder petrol engine, the speed of distributor shaft is |
| A. | Half the engine speed |
| B. | Four times the engine speed |
| C. | Same as engine speed |
| D. | Double of engine speed |
| E. | Quarter of the engine speed |
| Answer» A. Half the engine speed | |
| 265. |
Instead of values, ports are used in case of |
| A. | Petrol engine |
| B. | Diesel engine |
| C. | Four-stroke I.C. engines |
| D. | Two-stroke I.C. engines |
| E. | None of the above |
| Answer» D. Two-stroke I.C. engines | |
| 266. |
In triptane rating the non-knocking reference fuel is |
| A. | leaded 2,3,3 trimethyl butane |
| B. | isobutane, C4H10 |
| C. | butadiene C4H6 |
| D. | none of the above |
| E. | None of the above |
| Answer» A. leaded 2,3,3 trimethyl butane | |
| 267. |
Which type of pump is preferred for pumping lubricating oil in automobile |
| A. | Reciprocating type |
| B. | Centrifugal pump with impeller shrouded on one side only |
| C. | Open impeller type |
| D. | Gear pump |
| E. | Centrifugal pump with impeller shrouded on both sides |
| Answer» D. Gear pump | |
| 268. |
In cars a temperature indicating instrument is usually provided which indicates the temperature of |
| A. | Lubricating oil |
| B. | Air surrounding engine cylinders |
| C. | Jacket cooling water |
| D. | Engine piston |
| E. | Engine cylinder |
| Answer» C. Jacket cooling water | |
| 269. |
Which one of the following is not the trade name of tractor in India? |
| A. | Standard |
| B. | Kirloskar |
| C. | Escort |
| D. | Ford |
| E. | HMT |
| Answer» A. Standard | |
| 270. |
The brake pipes in hydraulic brake systems are made of |
| A. | Aluminium |
| B. | Plastic |
| C. | Steel |
| D. | Rubber |
| E. | Polyvinylchloride |
| Answer» C. Steel | |
| 271. |
The maximum temperature in an I.C. engine is of the order of |
| A. | 2000-2500?C |
| B. | 1000-1500?C |
| C. | 1500-2000?C |
| D. | 2500-3000?C |
| E. | 500-1000?C |
| Answer» A. 2000-2500?C | |
| 272. |
In automobile ignition system, a distributor is mounted on |
| A. | low voltage side |
| B. | high voltage side |
| C. | both low as well as high voltage side |
| D. | neither low voltage nor high voltage side |
| E. | None of the above |
| Answer» B. high voltage side | |
| 273. |
The purpose of crankcase ventilation is to |
| A. | Assist in maintaining the viscosity of oil |
| B. | Supply oxygen to the crank case |
| C. | Partly convert engine power into electric power |
| D. | Remove vaporized water and fuel |
| E. | Cool the oil |
| Answer» D. Remove vaporized water and fuel | |
| 274. |
In a S.I. engine, when most economical mixture is supplied, the colour of exhaust flame is expected to be |
| A. | Yellow-red to red |
| B. | Dark red |
| C. | Bluish, transparent |
| D. | Dark blue to reddish-yellow |
| E. | Colour of exhaust flame has nothing to do with the mixture composition |
| Answer» D. Dark blue to reddish-yellow | |
| 275. |
Which one of the following is a wrong staement? |
| A. | Scavenging is the process of removing the burnt gas from the engine cylinder by fresh charge coming into cylinder from the crank-case |
| B. | The power developed in four stroke I.S. engine, for the same engine speed and cylinder volume, as compared to that of a two stroke engine is one-half |
| C. | Instead of values, ports are used in case of two-stroke I.C. engines |
| D. | In case of four stroke I.C. engines, the exhaust gases are driven out from engine cylinder by fresh charge of the fuel entering the cylinder |
| E. | None of the above |
| Answer» D. In case of four stroke I.C. engines, the exhaust gases are driven out from engine cylinder by fresh charge of the fuel entering the cylinder | |
| 276. |
The castor is called positive when |
| A. | the top of the king pin axis is inclined to the rear of the vehicle |
| B. | the top of the king pin axis is inclined to the front of the vehicle |
| C. | the top of the king pin axis is inclined to the left of the vehicle |
| D. | the top of the king pin axis is inclined to the right of the vehicle |
| E. | None of the above |
| Answer» A. the top of the king pin axis is inclined to the rear of the vehicle | |
| 277. |
In a four stroke S.I engine the exhaust valve usually opens |
| A. | 35? to 60? after BDC |
| B. | 35? to 60? before BDC |
| C. | At BDC |
| D. | 10? to 20? before TDC |
| E. | At TDC |
| Answer» B. 35? to 60? before BDC | |
| 278. |
For a four stroke engine the maximum power output is reached at an air quantity |
| A. | Deficient by 15 to 20 percent |
| B. | Deficient by 25 to 30 percent |
| C. | Surplus by 15 to 20 percent |
| D. | Surplus by 5 to 10 percent |
| E. | Deficient by 5 to 10 percent |
| Answer» E. Deficient by 5 to 10 percent | |
| 279. |
Which of the following is not incorporated in scooters? |
| A. | Air cleaner |
| B. | Muffler |
| C. | Fuel pump |
| D. | Fuel filter |
| E. | None of the above |
| Answer» C. Fuel pump | |
| 280. |
The exhaust gases are driven out from engine cylinder by the fresh charge of the fuel enter in the cylinder, in case of |
| A. | Petrol engine |
| B. | Diesel engine |
| C. | Four stroke I.C. engines |
| D. | Two-stroke I.C. engines |
| E. | None of the above |
| Answer» D. Two-stroke I.C. engines | |
| 281. |
The freezing temperature of ordinary petrol is |
| A. | ? 30?C to ? 50?C |
| B. | ? 100?C to ? 117?C |
| C. | 10?C |
| D. | 0?C |
| E. | ? 5?C to ? 10?C |
| Answer» A. ? 30?C to ? 50?C | |
| 282. |
The function of governor is |
| A. | To increase the speed of the engine at full load |
| B. | To decrease the speed of the engine at no load |
| C. | To maintain constant load at varying speeds |
| D. | To maintain constant speed at varying loads |
| E. | None of the above |
| Answer» D. To maintain constant speed at varying loads | |
| 283. |
Air supply in case of Diesel engines is usually |
| A. | 5 to 10 percent surplus |
| B. | About 40 percent surplus |
| C. | 10 percent deficient |
| D. | Stoichometric |
| E. | 15 to 20 percent surplus |
| Answer» B. About 40 percent surplus | |
| 284. |
The capacity of a battery is usually expressed in terms of |
| A. | Volts |
| B. | Weight |
| C. | Current in amperes |
| D. | Ampere hours |
| E. | Watts |
| Answer» D. Ampere hours | |
| Explanation: The capacity of a battery is usually expressed in terms of ampere-hours (Ah), which is a unit of electric charge. This represents the amount of electrical energy that can be stored in the battery and is typically used to determine how long a battery will last before needing to be recharged or replaced. Voltage (volts) and current (amperes) are also important factors in determining the capacity of a battery, but they are not typically used as the primary measure of capacity. Weight and watts are also not typically used to express the capacity of a battery. | |
| 285. |
Oil pan is attached |
| A. | In a separate unit away from the crankcase |
| B. | At the top of the cylinder block |
| C. | To the bottom of the cylinder block |
| D. | Adjacent to oil filters |
| E. | At the outside wall of the crank case |
| Answer» C. To the bottom of the cylinder block | |
| 286. |
Dynamo in automobile is a |
| A. | series generator |
| B. | shunt generator |
| C. | either of (A) and (B) above |
| D. | none of the above |
| E. | None of the above |
| Answer» B. shunt generator | |
| 287. |
In an engine the probable cause for low oil pressure cannot be |
| A. | Use of dilute engine oil |
| B. | Excessive clearances at valve pushers |
| C. | Air leaks in oil pump suction line |
| D. | Use of heavy engine oil |
| E. | Water, sludge, dirt etc. restricting pump intake screen |
| Answer» D. Use of heavy engine oil | |
| 288. |
In a four stroke engine, each cylinder has |
| A. | Three valves |
| B. | One valve |
| C. | Four valves |
| D. | Number of valves depends upon the engine design |
| E. | Two valves |
| Answer» E. Two valves | |
| 289. |
An automobile tyre will wear rapidly in case |
| A. | It is overloaded |
| B. | It is misaligned |
| C. | It is incorrectly inflated |
| D. | It is more frequently subjected to braking |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 290. |
About 5% of fuel in the lubricating oil lessen the ability to lubricate by about |
| A. | 30% |
| B. | 90% |
| C. | 10% |
| D. | 1% |
| E. | 5% |
| Answer» A. 30% | |
| 291. |
In forced feed lubrication system the device used to guard against excessive oil pressure is known as |
| A. | Balancer |
| B. | Stop valve |
| C. | Release chamber |
| D. | Pressure actuator |
| E. | Relief valve |
| Answer» E. Relief valve | |
| 292. |
In actual practice, the exhaust value of a four stroke I.C. engine should close |
| A. | exactly at the end of expansion stroke |
| B. | slightly before the end of exhaust stroke |
| C. | slightly after the end of exhaust stroke |
| D. | none of the above |
| E. | None of the above |
| Answer» C. slightly after the end of exhaust stroke | |
| 293. |
Latex |
| A. | A milky juice of rubber |
| B. | A plastic |
| C. | A cover on wires carrying current to spark plugs |
| D. | A variety of lubricant |
| E. | A variety of P.V.C. |
| Answer» A. A milky juice of rubber | |
| 294. |
The pressure of air for braking in case of heavy duty trucks in usually of the order of |
| A. | Depends upon the road conditions |
| B. | 1 to 2 atm |
| C. | 14 to 17 atm |
| D. | 4 to 7 atm |
| E. | 2 to 3 atm |
| Answer» D. 4 to 7 atm | |
| 295. |
The operation of removing trapped air from hydraulic braking system is known as |
| A. | Pressurization |
| B. | Tapping |
| C. | Trapping |
| D. | Clearing |
| E. | Bleeding |
| Answer» E. Bleeding | |
| 296. |
For faultless operation of hydraulic braking system |
| A. | Brake fluid should be pure |
| B. | Boiling point of brake fluid should be high |
| C. | Viscosity of brake fluid should be high |
| D. | There should be minimum amount of trapped air |
| E. | All of the above |
| Answer» D. There should be minimum amount of trapped air | |
| 297. |
If the first element of the fuel and C.I. air is having high temperature and a short ignition delay, then knocking will |
| A. | accelerate |
| B. | decrease |
| C. | remain constant |
| D. | none of the above |
| E. | None of the above |
| Answer» B. decrease | |
| 298. |
Noisy brakes indicate |
| A. | Grit on lining |
| B. | Drums scored |
| C. | Loose lining screws |
| D. | Distored brake spiders |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 299. |
Steering gear |
| A. | rack and pinion type |
| B. | worm and roller type |
| C. | recirculating ball type |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 300. |
In a ball bearing which is more harder than the other parts? |
| A. | It It depends on the size of bearing |
| B. | Inner race |
| C. | Ball |
| D. | Outer race |
| E. | All are equally hardened |
| Answer» E. All are equally hardened | |
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