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

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. 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

3. 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

4. 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°.

5. 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

6. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft___________________?

   A. 1/2
   B. 1
   C. 2
   D. 4
   E. 8

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. The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?

   A. 1500 rpm
   B. 750 rpm
   C. 3000 rpm
   D. any value independent of engine speed
   E. none of the above

9. All the four operations in two stroke engine are performed in following number of revolutions of crank shaft______________________?

   A. Half
   B. One
   C. Two
   D. Four

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

    A. fuelinjection starts at 10° before to dead center and ends at 20° after tor dead center
    B. fuel injection starts at top dead center and ends at 20° after top dead center
    C. fuel injection starts at just before top dead center and ends just after top deac center
    D. may start and end anywhere
    E. none of the above