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

Related Mcqs:

1. 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.

2. 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

3. For same power and same speed, the flywheel of a four stroke engine as compared to two-stroke I.C. engine will be________________?

   A. smaller
   B. bigger
   C. same size
   D. dependent on other engine parameters
   E. unpredictable

4. For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________?

   A. about twice
   B. about 0.5 times
   C. nearly equal
   D. about 1.7 times
   E. about 5 times

5. 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

6. In a naturally aspirated diesel engine, the air is supplied by________________?

   A. a supercharger
   B. a centrifugal blower
   C. a vacuum chamber
   D. an injection tube
   E. forced chamber

7. 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

8. The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of____________________?

   A. 5:25:30:50
   B. 25:35:5:35
   C. 25:5:10:60
   D. 40:30:15:15
   E. 25:5:35:35

9. A 4-stroke diesel engine needs about following amount of air_________________?

   A. 75 cc per min. per h.p.
   B. 750 cc per min. per h.p.
   C. 7500 cc per min. per h.p.
   D. 75000 cc per min. per h.p.
   E. 750000 cc per min. per h.p

10. A two stroke crank compressed engine has following ports in the cylinder_______________?

    A. suction port and exhaust port
    B. transfer port only
    C. suction port and transfer port
    D. transfer port and exhaust port
    E. suction port, exhaust port and transfer port