Combustion in compression ignition engines is____________________?

Related Mcqs:

1. 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

2. 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

3. In the case of compression ignition engine, the %age of CO in exhaust gases is________________?

   A. Zero
   B. 5-10%
   C. Depends on load
   D. Considerable percent

4. Auto-ignition temperature is____________________?

   A. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
   B. temperature at which it solidifies or congeals
   C. that at which it catches fire without external aid
   D. indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
   E. indicated by 50% distillation temperature

5. Compression ratio of LC. engines is ___________________?

   A. the ratio of volumes of air in cylinder before compression stroke and after compression stroke
   B. volume displaced by piston per stroke and clearance volume in cylinder
   C. ratio of pressure after compression and before compression
   D. swept volume/cylinder volume
   E. cylinder volume/swept volume

6. Most high speed compression engines operate on __________________?

   A. Diesel cycle
   B. Otto cycle
   C. Dual combustion cycle
   D. Special type of air cycle
   E. Carnot cycle

7. Most high speed compression engines operate on ___________________?

   A. Otto cycle
   B. Diesel cycle
   C. Dual cycle
   D. Carnot cycle
   E. Two stroke cycle

8. Compression loss in I.C engines occurs due to_________________?

   A. leaking piston rings
   B. use of thick head gasket
   C. clogged air-inlet slots
   D. increase in clearance volume caused b bearing-bushing wear
   E. all of the above

9. 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

10. With increase in engine speed, the ignition of spark in petrol engine has to be __________________?

    A. Unaltered
    B. Increased
    C. Decreased
    D. Advanced