Detonation is caused by the following unstable compounds______________________?

Related Mcqs:

1. As a result of detonation in an I.C. engine, following parameter attains very high value _____________________?

   A. peak pressure
   B. rate of rise of pressure
   C. rate of rise of temperature
   D. peak temperature
   E. rate of rise of horse-power

2. According to Recardo’s theory, detonation occurs due to______________________?

   A. instantaneous auto-ignition of last part of charge to be burnt
   B. improper mixing of air and fuel
   C. improper combustion
   D. self ignition temperature has nothing to do with detonation
   E. none of the above

3. Detonation can be controlled by_____________________?

   A. varying compression ratio
   B. using lian mixture
   C. retarding the spark timing
   D. reducing the r.p.m.
   E. increasing inlet pressure

4. Violent sound pulsations within the cylinder of an I.C. engine are caused due to_________________?

   A. heavy turbulence
   B. improved scavenging
   C. heavy supercharging
   D. detonation
   E. preignition

5. Cavitation is caused by_____________________?

   A. high velocity
   B. high pressure
   C. weak material
   D. low pressure
   E. low viscosity

6. Which of the following statements is correct ?

   A. All the irreversible engines have same efficiency
   B. All the reversible engines have same efficiency
   C. Both Rankine and Caront cycles have same efficiency between same temperature limits
   D. All reversible engines working between same temperature limits have same-efficiency
   E. Between same temperature limits, both petrol and diesel engines have same efficiency

7. Cetane number is determined by comparing the performance of diesel oil with the following hydrocarbons___________________?

   A. cetane
   B. mixture of cetane and alphamethyl napthalene
   C. ethylene dibromide
   D. mixture of aldehydes and ketones
   E. mixture of cetane with tetra-ethyl lead

8. A 4-stroke diesel engine needs about following amount of air_________________?

   A. 75 cc per min. per h.p.
   B. 750 cc per min. per h.p.
   C. 7500 cc per min. per h.p.
   D. 75000 cc per min. per h.p.
   E. 750000 cc per min. per h.p

9. Which of the following engines can work on very lean mixture__________________?

   A. S.I. engine
   B. C.I. engine
   C. two stroke engine
   D. four stroke engine
   E. all of the above

10. Which of the following solid fuel has high carbon content?

    A. Coke
    B. Coal
    C. Peat
    D. None of these

    Submitted by: Faheem Zaman Dhaunroo