In loop scavenging, the top of the piston is________________?

Related Mcqs:

1. The top piston ring nearer to the piston crown is known as_____________________?

   A. compression ring
   B. oil ring
   C. scrapper ring
   D. groove ring
   E. leading ring

2. 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

3. Scavenging is usually done to increase__________________?

   A. thermal efficiency
   B. speed
   C. power output
   D. fuel consumption
   E. all of the above

4. 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

5. 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

6. 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

7. 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.

8. 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

9. Piston rings are plated with chromium,cadmium or phosphate in order to__________________?

   A. reduce cost
   B. improve surface finish
   C. prevent clogging
   D. reduce wear and eliminate scuffing
   E. improve heat transfer

10. Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?

    A. increases.
    B. decreases
    C. remains same
    D. unpredictable
    E. none of the above