McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
In a S.I. engine burned white deposit on spark plug with molten globules indicates that the engine has been generally operating on |
| A. | Most economical mixture |
| B. | Slightly rich mixture |
| C. | Stoichiometric mixture |
| D. | Too rich mixture |
| E. | Too lean mixture |
| Answer» E. Too lean mixture | |
| 152. |
Gum content of petroleum fuels is mainly due to |
| A. | concentration of sulphides and disulphides |
| B. | evaporation loss of lighter fractions |
| C. | oxidation of unsaturated bydrocarbons |
| D. | All of the above |
| E. | None of the above |
| Answer» C. oxidation of unsaturated bydrocarbons | |
| 153. |
A spark voltage needs a voltage of |
| A. | 440 V |
| B. | 220 V |
| C. | 12 V |
| D. | 24 V |
| E. | 5000 - 15000 V. |
| Answer» E. 5000 - 15000 V. | |
| 154. |
CFR engine is a |
| A. | high speed engine |
| B. | multi-cylinder four stroke engine |
| C. | 2 and 4 stroke engine |
| D. | variable compression ratio engine |
| E. | None of the above |
| Answer» D. variable compression ratio engine | |
| 155. |
During discharge of a battery, the sulphuric acid in the electrolyte is replaced by |
| A. | Lead sulphate |
| B. | Water |
| C. | Hydrogen |
| D. | Ions |
| E. | Oxygen |
| Answer» B. Water | |
| 156. |
The spark advance in SI engine is adjusted to obtain maximum pressure |
| A. | 10 - 12? past TDC |
| B. | at TDC |
| C. | 10 - 12? before TDC |
| D. | none of the above |
| E. | None of the above |
| Answer» A. 10 - 12? past TDC | |
| 157. |
In a four wheel drive the number of gear boxes is |
| A. | 2 |
| B. | 4 |
| C. | 1 |
| D. | One gear box with more gears |
| E. | Depends on the design of vehicle |
| Answer» A. 2 | |
| 158. |
Air injection in case of S.I. engine refers to injection of |
| A. | Doesn't exist |
| B. | Liquid fuel only |
| C. | Air only |
| D. | Air and fuel mixture |
| E. | Super charging |
| Answer» B. Liquid fuel only | |
| 159. |
The instrument used to check the state of charge of a battery is |
| A. | Battery eliminator |
| B. | Hygrometer |
| C. | Hydrometer |
| D. | Anemometer |
| E. | Battery charger |
| Answer» C. Hydrometer | |
| 160. |
Which fully charged the specific gravity of acid in a battery is usually |
| A. | 1.28 |
| B. | 1.12 |
| C. | 0.74 |
| D. | 0.84 |
| E. | 1 |
| Answer» A. 1.28 | |
| 161. |
The number of exhaust manifolds in a V-8 engine |
| A. | Eight |
| B. | One |
| C. | There is no exhaust manifold |
| D. | Two |
| E. | Four |
| Answer» D. Two | |
| 162. |
In the fuel injection pump of a Diesel engine, the fuel injection timing is adjusted by adjusting the |
| A. | Delivery valve |
| B. | Pump camshaft |
| C. | Lift of plunger |
| D. | Rotation plunger |
| E. | Tappets |
| Answer» D. Rotation plunger | |
| 163. |
Which of the following is a front wheel drive vehicle? |
| A. | Matador |
| B. | Ambassador |
| C. | Premier Padmini |
| D. | Maruti |
| E. | None of the above |
| Answer» D. Maruti | |
| 164. |
In an Ambassador car the number of forward gears provided is |
| A. | 2 |
| B. | 6 |
| C. | 5 |
| D. | 4 |
| E. | 3 |
| Answer» D. 4 | |
| 165. |
Which of the following hydrocarbon has ring structure? |
| A. | Paraffin |
| B. | Olefin |
| C. | Diolefin |
| D. | Naphthene |
| E. | None of the above |
| Answer» D. Naphthene | |
| 166. |
Brake lining is mounted on |
| A. | Brake shoe |
| B. | Brake drum |
| C. | Master cylinder |
| D. | Wheel cylinder |
| E. | Any of the above |
| Answer» A. Brake shoe | |
| 167. |
Water in lubricating oil aids in |
| A. | Burning |
| B. | Dilution |
| C. | Formation of solution |
| D. | Oxidation |
| E. | Decomposition |
| Answer» C. Formation of solution | |
| 168. |
In a Diesel engine, the temperature of gases under full load may be of the order of |
| A. | 100?C |
| B. | 900-1000?C |
| C. | 150-200?C |
| D. | 200-300?C |
| E. | 500-550?C |
| Answer» E. 500-550?C | |
| 169. |
In transmission system if the reverse gear slips out, the probable cause could be |
| A. | Reverse sliding gear teeth worn out |
| B. | Main shaft spines worn |
| C. | Reverse idler gear teeth worn |
| D. | Insufficient gear mesh |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 170. |
The device for smoothening out the power inpulses from the engine is called |
| A. | Clutch |
| B. | Differential |
| C. | Flywheel |
| D. | Gear box |
| E. | Torque convertor |
| Answer» C. Flywheel | |
| 171. |
In which case the air fuel ratio is expected to be the highest? |
| A. | Two stroke petrol engine |
| B. | Gas turbine |
| C. | Four stroke diesel engine |
| D. | Two stroke diesel engine |
| E. | Four stroke petrol engine |
| Answer» B. Gas turbine | |
| 172. |
Too rich mixture for a S.I. engine means air : fuel ratio of about |
| A. | 15 ; 1 |
| B. | 13 ; 1 |
| C. | 17 ; 1 |
| D. | 14 ; 1 |
| E. | 10 ; 1 |
| Answer» E. 10 ; 1 | |
| 173. |
During idling in a CI engine, the air fuel ratio may be of the order of |
| A. | 30 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| E. | 5 |
| Answer» A. 30 | |
| 174. |
In automobile ignition system contact breaker is used for |
| A. | Opening and closing the primary circuit |
| B. | opening and closing the secondary circuit |
| C. | increasing the duration of spark |
| D. | increasing the intensity of spark |
| E. | None of the above |
| Answer» A. Opening and closing the primary circuit | |
| 175. |
The spots from a car body are removed by |
| A. | Soap containing agents |
| B. | Soft sponge |
| C. | Washing with water |
| D. | Special cleaning agents |
| E. | Rubber brush and water |
| Answer» D. Special cleaning agents | |
| 176. |
The ignition coil acts as |
| A. | A capacitor |
| B. | An inductor |
| C. | A RC circuit |
| D. | A step up transformer |
| E. | A step down transformer |
| Answer» D. A step up transformer | |
| 177. |
If brake wheels get locked before the vehicle stops, the vehicle is said to be |
| A. | Rubbing |
| B. | Slipping |
| C. | Rolling |
| D. | Skidding |
| E. | Sliding |
| Answer» D. Skidding | |
| 178. |
Theoretically air required for the combustion of one kg of fuel is |
| A. | 17.4 kg |
| B. | 16.7 kg |
| C. | 18.9 kg |
| D. | 10 kg |
| E. | 14.5 kg |
| Answer» E. 14.5 kg | |
| 179. |
Quality of diesel oil can be expressed in terms of cetane number and also |
| A. | aniline point |
| B. | API gravity |
| C. | SAE number |
| D. | diesel index |
| E. | None of the above |
| Answer» B. API gravity | |
| 180. |
Automobile gears are generally made of |
| A. | Mild steel |
| B. | Alloy steel |
| C. | Cast iron |
| D. | Brass |
| E. | Stainless steel |
| Answer» B. Alloy steel | |
| 181. |
In a S.I. engine high air velocity through air hom may be of the order of |
| A. | 100 m/s |
| B. | 10 m/s |
| C. | 1 m/s |
| D. | 5 m/s |
| E. | 50 m/s |
| Answer» A. 100 m/s | |
| 182. |
In automobile, probable cause for ineffective brakes could be |
| A. | Grease on lining |
| B. | Excessive lining wear |
| C. | Drums scored |
| D. | Any of above |
| E. | None of the above |
| Answer» D. Any of above | |
| 183. |
If the oil level in the oil pan of the engine is maintained above the gauge mark, the likely damage it may cause is |
| A. | Engine fuming |
| B. | Carbon deposits |
| C. | Blue colour in exhaust |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 184. |
A two stroke engine is generally preferred to a four stroke engine because |
| A. | Shocks and vibrations are less |
| B. | It can be earily started |
| C. | Its size is smaller |
| D. | Its fuel consumption is low |
| E. | It can be easily controlled |
| Answer» C. Its size is smaller | |
| 185. |
High gum content in petrol may result in |
| A. | detonation |
| B. | misfiring |
| C. | clogging of carburettor |
| D. | none of the above |
| E. | None of the above |
| Answer» C. clogging of carburettor | |
| 186. |
Cetane number of a Diesel fuel is measure of |
| A. | Ignition quality |
| B. | Viscosity |
| C. | Volatility |
| D. | Delay period |
| E. | A.P.I. specific gravity |
| Answer» D. Delay period | |
| 187. |
Efficiency of an IC engine is normally of the order of |
| A. | 30-35% |
| B. | 50-60% |
| C. | 10-15% |
| D. | 80-90% |
| E. | Alcohol |
| Answer» A. 30-35% | |
| 188. |
For flow of petrol from fuel tank to the carburettor, the fuel system includes |
| A. | A vacuum pump |
| B. | A suction pump |
| C. | A float |
| D. | A fuel pump |
| E. | An acceleration pump |
| Answer» D. A fuel pump | |
| 189. |
Connecting rods are generally of the following form |
| A. | Forged I section |
| B. | Cast iron square section |
| C. | Forged square section steel |
| D. | Cast iron triangular section |
| E. | Forged round section |
| Answer» A. Forged I section | |
| 190. |
Piston compression rings are made of |
| A. | Bronze |
| B. | White metal |
| C. | Aluminium |
| D. | Steel |
| E. | Cast iron |
| Answer» E. Cast iron | |
| 191. |
Cetane number of Diesel oil normally available in market is in the range. |
| A. | 75 -- 80 |
| B. | 60 -- 65 |
| C. | 90 -- 105 |
| D. | 90 -- 100 |
| E. | 45 -- 50 |
| Answer» E. 45 -- 50 | |
| 192. |
If a spark plug does not fire, the probable cause could be |
| A. | Cracked porcelain |
| B. | Carbonized porcelain |
| C. | Moisture or dirt accumulation on porcelain |
| D. | Weak ignition coil |
| E. | Any of the above |
| Answer» B. Carbonized porcelain | |
| 193. |
Grease cannot be used as lubricant for the lubrication of |
| A. | Front wheel bearings |
| B. | Slip joint |
| C. | Input shaft |
| D. | Coolant pump |
| E. | Transmission |
| Answer» E. Transmission | |
| 194. |
Boiling range of kerosene is |
| A. | 50 to 100?C |
| B. | 100 to 150?C |
| C. | 150 to 300?C |
| D. | 350 to 500?C |
| E. | None of the above |
| Answer» C. 150 to 300?C | |
| 195. |
The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the cylinder from the crank-case, is known as |
| A. | cleaning |
| B. | priming |
| C. | scavenging |
| D. | none of the above |
| E. | None of the above |
| Answer» C. scavenging | |
| 196. |
In a four stroke SI engine the inlet valve opens |
| A. | at TDC and closes at BDC |
| B. | 10? before TDC and closes 10? after BDC |
| C. | 10? before TDC and closes 10? after BDC |
| D. | 10? before TDC and closes 50? after BDC |
| E. | None of the above |
| Answer» D. 10? before TDC and closes 50? after BDC | |
| 197. |
Which one of the following is not a part of the chassis? |
| A. | Steering system |
| B. | Wheels |
| C. | Rear axles |
| D. | Passenger seats |
| E. | Front axle |
| Answer» D. Passenger seats | |
| 198. |
The most widely used brakes are operted |
| A. | Electrically |
| B. | Hydraulically |
| C. | By vacuum |
| D. | Combination of (A) and (C) |
| E. | Mechanical |
| Answer» B. Hydraulically | |
| 199. |
Which part of the engine is directly driven by the starting motor? |
| A. | Flywheel |
| B. | Camshaft |
| C. | Crankshaft |
| D. | Pulley |
| E. | Any of the above |
| Answer» A. Flywheel | |
| 200. |
The fuel lines connecting the fuel injection pump individual elements with corresponding injector should have |
| A. | Length in increasing order |
| B. | Minimum length |
| C. | Varying length |
| D. | Equal length |
| E. | Length in decreasing order |
| Answer» A. Length in increasing order | |
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