The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be _______________?

Related Mcqs:

1. With increase in compression ratio, the efficiency of the otto engine________________?

   A. Increases
   B. Decreases
   C. Remain constant
   D. Increases linearly

2. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is____________________?

   A. 100,000 kW
   B. 160,000 kW
   C. 200,000 kW
   D. 320,000 kW

3. The work done in isothermal compression compared to that in adiabatic compression will be__________________?

   A. Less
   B. More
   C. Same
   D. More or less depending upon the extent of work done

4. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________?

   A. Less pronounced
   B. More pronounced
   C. Equal
   D. Data insufficient, can’t be predicted

5. Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________________?

   A. (T2 – T1)/T2
   B. (T2 – T1)/T1
   C. (T1 – T2)/T2
   D. (T1 – T2)/T1

6. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the__________________?

   A. Two temperatures only
   B. Pressure of working fluid
   C. Mass of the working fluid
   D. Mass and pressure both of the working fluid

7. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the__________________?

   A. Cold reservoir approaches zero
   B. Hot reservoir approaches infinity
   C. Either A. or B
   D. Neither A. nor B

8. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by__________________?

   A. T1/(T1-T2)
   B. T2/(T1-T2)
   C. T1/T2
   D. T2/R1

9. Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?

   A. 300 × (32/7)
   B. 300 × (33/5)
   C. 300 × (333/7)
   D. 300 × (35/7)

10. Air-petrol ratio for maximum power generation in spark ignition engine is about_____________________?

    A. 6 : 1
    B. 12 : 1
    C. 18 : 1
    D. 24 : 1