The knocking in diesel engines for given fuel, will be__________________?

Related Mcqs:

1. Diesel engines as compared to petrol engines require ______________________?

   A. bigger flywheel
   B. smaller flywheel
   C. same size flywheel
   D. no flywheel
   E. flywheel whose size may be less or more depending on several other fac-tors

2. Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?

   A. not true
   B. true at full load
   C. true at part load
   D. true at both part and full load
   E. there could not be any such criterion

3. 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

4. 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

5. The ignition coil in diesel engines produces voltage of the order of________________?

   A. 6 to 12 volts
   B. 240 volts
   C. 1000 volts
   D. 20,000 volts
   E. 80,000 volts

6. Which of the following are used in diesel engines and oil fired boilers :

   A. Paraffin
   B. Gasoline
   C. Heavy fuel oils
   d) Patrol

   Submitted by: Faheem Zaman Dhaunroo

7. 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.

8. To reduce the possibility of knock in the C.I. engines, the first elements of fuel and air should have_______________?

   A. high temperature
   B. high density
   C. short delay
   D. reactive mixture
   E. all of the above

9. In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of________________?

   A. 0.85
   B. 1
   C. 1.1 to 1.3
   D. 1.2 to 1.5

10. Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?

    A. the friction is high
    B. the friction is unpredictable
    C. the small difference in cooling water temperature or in internal friction has a disproportionate effect
    D. the engine is rarely operated
    E. none of the above