If the intake air temperature of I.C. engine increases, its efficiency will_________________?

Related Mcqs:

1. It the temperature of intake air in IC engines is lowered, then its efficiency will_______________________?

   A. increase
   B. decrease
   C. remain same
   D. increase upto certain limit and then decrease
   E. decrease upto certain limit and then in-crease

2. In petrol engine, increase of cooling water temperature will_________________?

   A. increase the knocking tendency
   B. decrease the knocking tendecny
   C. not affect the knocking tendency
   D. increase or decrease knocking tendency depedning on strength and time of spark
   E. unpredictable

3. The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?

   A. lean mixture
   B. chemically correct mixture
   C. rich mixture
   D. unpredictable
   E. none of the above

4. Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The minimum value occurs in the region of________________?

   A. Lean mixture
   B. Chemically correct fuel air ratio
   C. Rich mixture
   D. Unpredictable

5. The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?

   A. lean mixture
   B. chemically correct mixture
   C. rich mixture
   D. unpredictable
   E. none of the above

6. In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?

   A. increase the knocking tendency
   B. decrease the knocking tendency
   C. not affect the knocking tendency
   D. increase or decrease knocking tendency depending on strength and time of spark
   E. unpredictable

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. 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. Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided__________________?

   A. it is properly designed
   B. best quality fuel is used
   C. can not work as it is impossible
   D. flywheel size is proper
   E. engine cooling is stopped

10. 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