Scavenging is usually done to increase__________________? - PakMcqs

Related Mcqs:

1. The term scavenging is generally associated with______________________?

   A. 2-stroke cycle engines B. 4-stroke cycle engines C. aeroplane engines D. diesel engines E. high efficiency engines...

2. Scavenging air in diesel engine means___________________?

   A. air used for combustion sent under pres-sure B. forced air for cooling cylinder C. burnt air containing products of combustion D. air used for forcing burnt gases out of engine’s cylinder during the exhaust period E. air fuel mixture...

3. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?

   A. yes B. no C. to some extent D. unpredictable E. depends on other factors...

4. In loop scavenging, the top of the piston is________________?

   A. flat B. contoured C. slanted D. depressed E. convex shaped...

5. In the crankcase method of scavenging, the air pressure is produced by_________________?

   A. supercharger B. centrifugal pump C. natural aspirator D. movement of engine piston E. reciprocating pump...

6. The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?

   A. higher B. lower C. same D. depends on size of engine E. unpredictable....

7. Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________?

   A. Supercharged B. Not supercharged C. Charged D. Supercharged provided its speed is low...

8. Carburretion is done to________________?

   A. feed petrol into cylinder B. govern the engine C. break up and mix the petrol with air D. heat up the charge to cylinder E. scavenge the cylinder...

9. Engine pistons ‘are usually made of aluminium alloy because it_________________?

   A. is lighter B. wears less C. absorbs shocks D. is stronger E. does not react with fuel and lub oil...

10. Piston rings are usually made of___________________?

    A. cast iron B. aluminium C. phosphor bronze D. babbitt E. carbon steel...