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____________________?

Related Mcqs:

1. 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

2. In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of____________________?

   A. 250°C
   B. 500°C
   C. 1000°C
   D. 150CPC
   E. 2000°C

3. The cooling water requirement for diesel engine is of the order of________________?

   A. 0.2 to 1.0 liter per minute per h.p.
   B. 1 to 3 liters per minute per h.p.
   C. 5 to 10 liters per minute per h.p
   D. 10 to 20 liters per minute per h.p.
   E. 20-30 liters per minute per h.p

4. High carbon content in diesel oil used for diesel engine leads to_________________?

   A. production of highly corrosive gases corroding the cylinder walls and exhaust system
   B. excessive engine wear
   C. damaging of both the storage tank and the engine
   D. deposition on engine parts
   E. none of the above.

5. 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

6. 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

7. 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

8. A hmh flame speed is obtained in diesel engine when air fuel ratio is_______________?

   A. uniform throughout the mixture
   B. chemically correct mixture
   C. about 3-5% rich mixture
   D. about 10% rich mixture
   E. about 10% lean mixture

9. In diesel engine, the compression ratio in comparison to expansion ratio is_______________?

   A. same
   B. less
   C. more
   D. variable
   E. more/less depending on engine capacity.

10. For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of _________________?

    A. 9 : 1
    B. 12 : 1
    C. 15 : 1
    D. 18 : 1
    E. 20: 1