McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 201. |
In order to engage securely and prevent dragging the clearance between release bearing and release collar in a clutch is usually |
| A. | 30 - 35 mm |
| B. | 20 - 25 mm |
| C. | 40 - 50 mm |
| D. | 2 - 3 mm |
| E. | 10 - 15 mm |
| Answer» D. 2 - 3 mm | |
| 202. |
Which of the following action reduces the life of tyre? |
| A. | Low air pressure |
| B. | Extra load |
| C. | Frequent braking |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 203. |
Loss of engine compression can result from |
| A. | Wrong timing |
| B. | Defective fan belt |
| C. | Worn out rings |
| D. | Excessive tappet clearance |
| E. | Excessive tappet clearance |
| Answer» C. Worn out rings | |
| 204. |
Excess oil consumption in engine may be due to |
| A. | Leakage of oil through oil pan gasket |
| B. | Poor quality or improper viscosity of engine oil |
| C. | Excessive oil pressure |
| D. | Badly worn piston rings |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 205. |
A hot plug has a |
| A. | Heat dam |
| B. | Short heat path |
| C. | Long insulator |
| D. | Long heat path |
| E. | Short insulator |
| Answer» A. Heat dam | |
| 206. |
Acid used in automobile battery is |
| A. | Hydrochloric acid |
| B. | Sulphuric acid |
| C. | Dilute nitric acid |
| D. | Concentrated nitric acid |
| E. | Hydrofluoric acid |
| Answer» B. Sulphuric acid | |
| 207. |
Diesel engine as compared to petrol engines require |
| A. | Biggenr flywheels |
| B. | Same size flywheel |
| C. | Smaller flywheel |
| D. | Flywheel whose size may be less or more depending on several other factors |
| E. | No flywheel |
| Answer» A. Biggenr flywheels | |
| 208. |
In a Diesel engine the fuel injection pressure is usually in the range |
| A. | 20 to 25 atm |
| B. | 10 to 15 atm |
| C. | 30 to 40 atm |
| D. | 60 to 70 atm |
| E. | 100 to 170 atm |
| Answer» E. 100 to 170 atm | |
| 209. |
In case of petrol engine, pre-ignition of the charge during compression stroke is |
| A. | not possible |
| B. | possible |
| C. | possible during power stroke |
| D. | none of the above |
| E. | None of the above |
| Answer» B. possible | |
| 210. |
Common causes for excessive oil consumption include |
| A. | Defective radiator |
| B. | Short trips and cold weather |
| C. | Heavy oil and light bearings |
| D. | Frequent oil changes |
| E. | High speed and worn engine |
| Answer» E. High speed and worn engine | |
| 211. |
Two SI engines run at same speed and develop same power but have different compression ratio. The engine with higher compression ratio will have its ignition advance |
| A. | more than |
| B. | less than |
| C. | equal to |
| D. | none of the above |
| E. | None of the above |
| Answer» B. less than | |
| 212. |
Exhaust valve temperature is about |
| A. | 1000?C |
| B. | 150?C |
| C. | 500?C |
| D. | 100?C |
| E. | 35?C |
| Answer» C. 500?C | |
| 213. |
Which oil is more viscous |
| A. | SAE 50 |
| B. | SAE 40 |
| C. | SAE 70 |
| D. | SAE 80 |
| E. | SAE 30 |
| Answer» D. SAE 80 | |
| 214. |
Commonly used antifeeze solution in automobiles is |
| A. | Freon 12 |
| B. | Ammonium chloride |
| C. | Carbon disulphide |
| D. | Liquid ammonia |
| E. | Gloycol |
| Answer» E. Gloycol | |
| 215. |
The heating value of diesel is approximately |
| A. | 7500 kcal/kg |
| B. | 6500 kcal/kg |
| C. | 10,000 kcal/kg |
| D. | 8500 kcal/kg |
| E. | 125000 kcal/kg |
| Answer» C. 10,000 kcal/kg | |
| 216. |
For S.I. engine carburettor the float is usually made of |
| A. | Brass sheet |
| B. | Nylon |
| C. | Cast iron |
| D. | Either (A) or (B) |
| E. | Either (B) or (C) |
| Answer» D. Either (A) or (B) | |
| 217. |
The exhaust value of a four stroke I.C. engine should open |
| A. | exactly at the end of expansion stroke |
| B. | slightly after the end of expansion stroke |
| C. | slightly before the end of expansion stroke |
| D. | none of the above |
| E. | None of the above |
| Answer» C. slightly before the end of expansion stroke | |
| 218. |
In case of petrol engines, into the engine cylinder during suction stroke |
| A. | air and fuel is drawn |
| B. | only fuel is drawn |
| C. | only air is drawn |
| D. | none of the above |
| E. | None of the above |
| Answer» A. air and fuel is drawn | |
| 219. |
Which of the following is a diesel engined vehicle? |
| A. | Ambassador Mark II |
| B. | Fiat 1100 |
| C. | Premier Padmini |
| D. | Standard Gazel |
| E. | None of the above |
| Answer» E. None of the above | |
| 220. |
In case of friction clutch the coefficient of friction is expected to be |
| A. | 0.4 to 0.5 |
| B. | 0.85 to 0.90 |
| C. | 0.1 |
| D. | 0.01 |
| E. | 0.15 to 0.17 |
| Answer» A. 0.4 to 0.5 | |
| 221. |
The octane rating of petrol commercially available is usually |
| A. | 110 - 125 |
| B. | 90 - 100 |
| C. | 100 - 105 |
| D. | 125 - 140 |
| E. | 85 - 90 |
| Answer» E. 85 - 90 | |
| 222. |
In a typical medium speed 4-stroke cycle diesel engine, the inlet value |
| A. | Opens at 20? before TDC and closes at 35? after BDC |
| B. | Opens at TDC and closes at BDC |
| C. | Opens at 10? after TDC and closes at 20? after BDC |
| D. | Remains open for 200?C |
| E. | None of the above |
| Answer» A. Opens at 20? before TDC and closes at 35? after BDC | |
| 223. |
The advanctage of stratified charge engine is |
| A. | better part load efficiency |
| B. | resistance to knocking tendency |
| C. | better volumetric efficiency |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 224. |
Accumulation of rust and scale in the engine cooling system will cause |
| A. | Reduced output |
| B. | Overheating |
| C. | Slow warm up |
| D. | Low exhaust temperature |
| E. | More noise |
| Answer» B. Overheating | |
| 225. |
The centrifugal advance mechanism is located |
| A. | One the camshaft |
| B. | In the camshaft gear |
| C. | In the distributor |
| D. | On the crankshaft balancer |
| E. | At the drive gear |
| Answer» C. In the distributor | |
| 226. |
In a Diesel engine the function of a fuel injector is |
| A. | To mix fuel and air |
| B. | To ignite air-fuel mixture |
| C. | To provide adequate air fuel mixture for combustion |
| D. | To provide flame front for ignition |
| E. | To spray atomized fuel in the cylinder |
| Answer» E. To spray atomized fuel in the cylinder | |
| 227. |
The angle during which both the inlet and exhaust valves remain open simultaneously, is known as |
| A. | exhaust value angle |
| B. | value angle |
| C. | value overlap |
| D. | none of the above |
| E. | None of the above |
| Answer» C. value overlap | |
| 228. |
The angle of camber is usually |
| A. | 5? to 7? |
| B. | Between |
| C. | Less than |
| D. | 2? to 5? |
| E. | More than 7? |
| Answer» B. Between | |
| 229. |
The valve is opened as the cam lobe on the cam raises the |
| A. | Piston pin |
| B. | Valve lifter |
| C. | Bearing |
| D. | Valve guide |
| E. | Valve seat |
| Answer» B. Valve lifter | |
| 230. |
The device used to reduce the exhaust noise is known as |
| A. | Exhaust manifold |
| B. | Exhaust pipe |
| C. | Tail pipe |
| D. | Muffler |
| E. | None of the above |
| Answer» D. Muffler | |
| 231. |
The firing order in case of four cylinder in-line engines is uaually |
| A. | 1-2-4-3 |
| B. | 1-3-4-2 |
| C. | 1-4-3-2 |
| D. | Either (A) or (B) |
| E. | Either (B) or (C) |
| Answer» E. Either (B) or (C) | |
| 232. |
The power developed in four stroke I.C. engine, for the same engine speed and cylinder volume, as compared to that of a two stroke engine is |
| A. | two times |
| B. | equal |
| C. | one half |
| D. | none of the above |
| E. | None of the above |
| Answer» C. one half | |
| 233. |
Power assisted brakes are often provided on |
| A. | motor cycles |
| B. | air cooled engine vehicles |
| C. | slow speed vehicles like road rollers etc. |
| D. | heavy duty vehicles |
| E. | None of the above |
| Answer» D. heavy duty vehicles | |
| 234. |
The magneto in an automobile is basically |
| A. | Magnetic circuit |
| B. | Transistor |
| C. | A.C. generator |
| D. | D.C. generator |
| E. | Capacitor |
| Answer» D. D.C. generator | |
| 235. |
Mixing of fuel and air in case of a diesel engine occurs in |
| A. | Injector |
| B. | Engine cylinder |
| C. | Inlet valve |
| D. | Fuel pump |
| E. | Inlet manifold |
| Answer» B. Engine cylinder | |
| 236. |
The minimum cranking speed in petrol engines is |
| A. | 2 - 3 rpm |
| B. | Equal to the normal operating speed |
| C. | 60 - 80 rpm |
| D. | Half of operating speed |
| E. | One fourth of operating speed |
| Answer» C. 60 - 80 rpm | |
| 237. |
The function of a governor in automobile is to |
| A. | Limit the power |
| B. | Maintain constant engine speed |
| C. | Effect maximum fuel economy |
| D. | Maintain constant engine speed when the vehicle speed changes |
| E. | Limit the speed |
| Answer» E. Limit the speed | |
| 238. |
The term master cylinder is associated with |
| A. | Braking system |
| B. | Starting mechanism |
| C. | Engine |
| D. | Lubrication system |
| E. | Cooling cylinder |
| Answer» A. Braking system | |
| 239. |
Ignition advance in S.I. engine is not the direct function of |
| A. | mixture strength |
| B. | compression ratio |
| C. | grade of petrol |
| D. | load on engine |
| E. | None of the above |
| Answer» D. load on engine | |
| 240. |
As carbon accumulates in a cylinder it causes an increase in |
| A. | Clearance volume |
| B. | Ignition time |
| C. | Volumetric efficiency |
| D. | Piston displacement |
| E. | Effective compression ratio |
| Answer» E. Effective compression ratio | |
| 241. |
The speed of the engine is increased or decreased by operating |
| A. | Throttle valve |
| B. | Choke valve |
| C. | Steering |
| D. | Clutch |
| E. | Any of the above |
| Answer» A. Throttle valve | |
| 242. |
Ethyl fluid is used as |
| A. | To improve lubricating quality of fuel |
| B. | To increase octane rating of fuel |
| C. | As a detonating agent |
| D. | To increase cetane rotary of fuel |
| E. | As a superior type of fluid compared to others |
| Answer» B. To increase octane rating of fuel | |
| 243. |
Which tractor has an air cooled engine |
| A. | Hindustan |
| B. | HMT |
| C. | Ford |
| D. | Ferguson |
| E. | Eicher |
| Answer» E. Eicher | |
| 244. |
The number of cylinders in an Ambassador car is |
| A. | 4 |
| B. | 2 |
| C. | 8 |
| D. | 6 |
| E. | 3 |
| Answer» A. 4 | |
| 245. |
Engine oil is usually renewed after |
| A. | 2500 - 6000 km |
| B. | 24 km |
| C. | 500 km |
| D. | 100 km |
| E. | 100 km |
| Answer» A. 2500 - 6000 km | |
| 246. |
By supercharging |
| A. | Power stroke becomes stronger |
| B. | Loss in exhaust is reduced |
| C. | Engine can be made to run smoother |
| D. | Thermal efficiency of the engine can be improved |
| E. | None of the above |
| Answer» D. Thermal efficiency of the engine can be improved | |
| 247. |
Automobile radiator is filled with |
| A. | Hard water |
| B. | Acidic water |
| C. | Alkaline water |
| D. | Rain water |
| E. | Soft water |
| Answer» E. Soft water | |
| 248. |
Brake shoes are made of |
| A. | Pressed steel |
| B. | Cast aluminium |
| C. | Plastic fibre |
| D. | Either (A) or (B) |
| E. | Either (A) or (C) |
| Answer» D. Either (A) or (B) | |
| 249. |
Theoretical correct air-fuel ratio for tetrol engine is |
| A. | 6 ; 1 |
| B. | 9 ; 1 |
| C. | 12 ; 1 |
| D. | 15 ; 1 |
| E. | 20 ; 1 |
| Answer» D. 15 ; 1 | |
| 250. |
When IHP and FHP on an engine are known, we can calculate |
| A. | Mean effective pressure |
| B. | Specific air consumption |
| C. | Revolutions per minute |
| D. | Brake horse power |
| E. | Compression ratio |
| Answer» D. Brake horse power | |
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