McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 251. |
CO in the exhaust of a car engine should not be more than: |
| A. | 0.5% |
| B. | 2% |
| C. | 5% |
| D. | 10% |
| Answer» A. 0.5% | |
| 252. |
The PCV (Positive Crankcase Ventilation) valve is located between the |
| A. | Air cleaner and the carburetor |
| B. | Carburetor and the intake manifold |
| C. | Intake manifold and air cleaner |
| D. | Intake manifold and crankcase |
| Answer» D. Intake manifold and crankcase | |
| 253. |
In case of engines backfiring, the PCV valve: |
| A. | Opens maximum |
| B. | Closes |
| C. | Disintegrates |
| D. | Sticks in the centre position |
| Answer» B. Closes | |
| 254. |
The position of the PCV valve plunger at idle speed is |
| A. | Towards the valve outlet side |
| B. | Towards the valve inlet side |
| C. | Towards the crankcase |
| D. | Near the valve centre |
| Answer» A. Towards the valve outlet side | |
| 255. |
The function of charcoal granules is to absorb: |
| A. | Water vapour |
| B. | Carbon monoxide |
| C. | Petrol Vapour |
| D. | Liquid petrol |
| Answer» C. Petrol Vapour | |
| 256. |
The liquid – vapour separator is located near the |
| A. | Fuel tank |
| B. | Carburettor |
| C. | Charcoal canister |
| D. | Purge valve |
| Answer» A. Fuel tank | |
| 257. |
EGR (Exhaust Gas Recirculation) system is employed for controlling emissions of: |
| A. | HC |
| B. | CO |
| C. | NOx |
| D. | HC and CO |
| Answer» C. NOx | |
| 258. |
The main purpose of the diverter valve in the air injection system is to |
| A. | Close the check valve |
| B. | Prevent back fire in the exhaust system |
| C. | Prevent backfire in the inlet manifold |
| D. | Weaken the air-fuel mixture |
| Answer» B. Prevent back fire in the exhaust system | |
| 259. |
The catalyst used in the reduction converter is |
| A. | Copper |
| B. | Charcoal |
| C. | Rodium |
| D. | Platinum |
| Answer» C. Rodium | |
| 260. |
The catalyst used in the converter for oxidizing HC and CO is |
| A. | Copper |
| B. | Charcoal |
| C. | Rodium |
| D. | Platinum |
| Answer» D. Platinum | |
| 261. |
In a three-way converter, the first converter controls |
| A. | HC |
| B. | CO |
| C. | NOx |
| D. | All of these |
| Answer» C. NOx | |
| 262. |
The air fuel ratio required for the efficient operation of a three approximately |
| A. | 5:1 |
| B. | 10:1 |
| C. | 15:1 |
| D. | 20:1S |
| Answer» C. 15:1 | |
| 263. |
Which stage of vehicle emission norms presently applicable in India in Internal Combustion Engine? |
| A. | Bharat Stage V |
| B. | Bharat Stage IV |
| C. | Bharat Stage III |
| D. | Bharat Stage II |
| Answer» B. Bharat Stage IV | |
| 264. |
Which of the following is one of the major exhaust emissions from CI engines compared to SI engines? |
| A. | Oxides of nitrogen |
| B. | Particulates |
| C. | CO and CO2 |
| D. | Unburnt hydrocarbon |
| Answer» B. Particulates | |
| 265. |
Which of the following causes the photochemical smog? |
| A. | Excess O2 |
| B. | CO and CO2 |
| C. | Soot and particulate matter |
| D. | NOx and HC |
| Answer» D. NOx and HC | |
| 266. |
What does the blue smoke in diesel engine indicate? |
| A. | Unburnt oil |
| B. | HC |
| C. | NOx |
| D. | CO |
| Answer» A. Unburnt oil | |
| 267. |
During which condition of the vehicle does NOx emission in SI engine will be lowest? |
| A. | Cruising |
| B. | Idling |
| C. | Accelerating |
| D. | Decelerating |
| Answer» B. Idling | |
| 268. |
For what purpose is the Rhodium used? |
| A. | To reduce CO and HC |
| B. | To reduce NOx |
| C. | To reduce CO |
| D. | To reduce HC |
| Answer» B. To reduce NOx | |
| 269. |
Why are lead compounds added in petrol? |
| A. | Reduce knocking |
| B. | Reduce HC emission |
| C. | Reduce exhaust temperature |
| D. | Increase power output |
| Answer» B. Reduce HC emission | |
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