In a typical medium speed, 4-stroke cycle diesel engine ___________________?

Related Mcqs:

1. In a typical medium speed 4-stroke cycle diesel engine the inlet valve_____________________?

   A. opens at 20° before top dead center and closes at 35° after the bottom dead center
   B. opens at top dead center and closes at bottom dead center
   C. opens at 10° after top dead center and closes 20° before the bottom dead center
   D. may open or close anywhere
   E. remains open for 200°.

2. In a typical medium speed 4-stroke cycle diesel engine________________?

   A. compression starts at 35° after bottom dead center and ends at top dead center
   B. compression starts at bottom dead center and ends at top dead center
   C. compression starts at 10° before bottom dead center and, ends just before top dead center
   D. may start and end anywhere
   E. none of the above

3. In a typical medium speed 4 stroke cycle diesel engine_______________?

   A. exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center
   B. exhaust valve opens at bottom ‘dead center and closes at top dead center
   C. exhaust valve opens just after bottom dead center and closes just before top dead center
   D. may open and close anywhere
   E. none of the above is true

4. 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

5. 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.

6. 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

7. 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

8. The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?

   A. more
   B. less
   C. same
   D. more upto some load and then less
   E. it may be less or more depending on several other factors

9. 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

10. The inlet value of a four stroke cycle I.C engine remains open for nearly___________________?

    A. 180°
    B. 125°
    C. 235°
    D. 200°
    E. 275°