The compression ratio of motor cars is___________________?

Related Mcqs:

1. The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?

   A. increase
   B. decrease
   C. remain unaffected
   D. increase/decrease depending upon engine capacity
   E. first increase and then decrease

2. The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________?

   A. increase
   B. decrease
   C. be independent
   D. may increase or decrease depending on other factors
   E. none of the above

3. 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.

4. Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke_________________?

   Isothermal compression efficiency, even when running at high speed, can be approached by using
   A. multi-stage compression
   B. cold water spray
   C. both A. and B. above
   D. fully insulating the cylinder
   E. high stroke

5. The m.e.p. of a diesel cycle having fixed compression ratio with increase in cut-off will_________________?

   A. increase
   B. decreae
   C. be unaffected
   D. depend on other factors
   E. unpredictable

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 efficiency of the ideal diesel cycle is ________ than that of Otto cycle, for the same compression ratio

   A. Higher
   B. Lower
   C. Equal
   D. None of these

   Submitted by: Faheem Zaman Dhaunroo

8. 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

9. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?

   A. same
   B. less
   C. more
   D. more or less depending on power rating
   E. unpredictable

10. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be________________?

    A. 2%
    B. 4%
    C. 8%
    D. 14%
    E. 27%.