Test: IC Engine Performances, Carburetion, Fuel Injection, Emission & Control - 1 - Mechanical Engineering MCQ

Assertion (A): One of the important requirements of a carburettor is to supply leanmixture at starting.Reason (R): A rather lean mixture is required at No-load and low-load operation of a SI engine.  

In some carburettor, meter rod and economiser device is used for  

Consider the following statements:  
1. Recycling exhaust gases with intake increases emission of oxides ofnitrogen from the engine.
2. When the carburettor throttle is suddenly opened, the fuel air mixtureleans out temporarily causing engine stall.
3. The effect of increase in altitude on carburettor is to enrich the entirepart-throttle operation.
4. Use of multiple venturi system makes it possible to obtain a high velocityair stream when the fuel is introduced at the main venturi throat.
Which of these statements are correct?

Consider the following statements regarding the advantages of fuel injection over carburetion in S.I. engines:
1. Higher power output and increased volumetric efficiency. [IES-2001]
2. Simple and inexpensive injection equipment.
3. Longer life of injection equipment.
4. Less knocking and reduced tendency for back-fire.
Select the correct answer using the codes given below:

Assertion (A): Air injection system finds wide application in modern diesel engines.Reason (R): Very good atomization of fuels is attained by the air injection system.

Generally, in Bosch type fuel injection pumps, the quantity of fuel is increased or decreased with change in load, due to change in  

With increasing temperature of intake air, IC engine efficiency  

In a variable speed S.I. engine, the maximum torque occurs at the maximum

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

The method of determination of indicated power of multi-cylinder SI engineis by the use of 

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 the codes given below the lists :  
 

Keeping other parameters constant brake power of a diesel engine can be increased by  

Which one of the following quantities is assumed constant for an internal combustion engine while estimating  its friction power by extrapolation through Willan's line? 

Global warming is caused by 

Which one of the following set of materials is most commonly used in catalytic converters for CI engines?  

Which one of the following cannot be controlled by a three-way catalytic converter?

With respect to I.C. engine emissions, consider the following statements:
1. Evaporative emissions have no carbon monoxide and oxides of nitrogen.
2. Blow by emissions is essentially carbon monoxide and suspended particulate matter. 
3. Exhaust emissions contain 100% of carbon monoxide, 100% of oxides of nitrogen and around 50-55% of hydrocarbons emitted by the engine.
4. There are no suspended particulates in the exhaust.Of these statements are correct