Volumetric efficiency of air compressors is of the order of________________?

Related Mcqs:

1. Maximum temprature in a gas turbine is of the order of COMPRESSORS, GAS TURBINES AND JET ENGINES______________________?

   A. 2500°C
   B. 2000°C
   C. 1500°C
   D. 1000°C
   E. 700°C

2. Volumetric efficiency of a compressor without clearance volume________________?

   A. increases with increase in compression ratio
   B. decreases with increase in compression ratio
   C. is not dependent upon compressin ratio
   D. may increase/decrease depending on compressor capacity
   E. unpredictable

3. Volumetric efficiency is_____________________?

   A. the ratio of stroke volume to clearance volume
   B. the ratio of the air actually delivered to the amount of piston displacement
   C. reciprocal of compression ratio
   D. index of compressor performance
   E. proportional to compression ratio

4. Volumetric efficiency of a compressor with clearance volume ________________?

   A. increases with increase in compression ratio
   B. decreases with increase in compression ratio
   C. in not dependent upon compression ratio
   D. may increase/decrease depending on compressor capacity
   E. unpredictable

5. The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?

   A. 0.1%
   B. 0.5%
   C. 1.0%
   D. 5%
   E. 10%.

6. As the value of index ‘«’ is decreased, the volumetric efficiency will___________________?

   A. increase
   B. decrease
   C. remain unaffected
   D. may increase/decrease depending on compressor clearance
   E. none of the above

7. The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________?

   A. 0.1%
   B. 0.5%
   C. 1%
   D. 5%
   E. 10%.

8. The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of________________?

   A. 50%
   B. 75%
   C. 85%
   D. 90%
   E. 99%

9. During peak load periods, the best method of controlling compressors is___________________?

   A. start-stop motor
   B. constant speed unloader
   C. relief valve
   D. variable speed
   E. none of the above

10. Rotary compressors are suitable for ____________________?

    A. large discharge at high pressure
    B. low discharge at high pressure
    C. large discharge at low pressure
    D. low discharge at low pressure
    E. there is no such limitation