The function of injector used in small steam plants is to________________?

Related Mcqs:

1. The function of injector used in small capacity boilers is to____________________?

   A. create vacuum
   B. inject chemical solution in feed pump
   C. pump water, similar to boiler feed pump
   D. add make up water in the system
   E. none of the above

2. In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be__________________?

   A. less than 100°C
   B. between 100-250°C
   C. between 250 – 300°C
   D. between 400 – 500°C
   E. between 500 – 1000°C

3. In a diesel engine, injection pressure developed by injector is of the order of______________?

   A. 10 kg/cm2
   B. 100 kg/cm2
   C. 500 kg/cm2
   D. 1400 kg/cm2

4. One kg of steam sample contains 0.8 kg dry steam; it’s dryness fraction is__________________?

   A. 0.2
   B. 0.8
   C. 1.0
   D. 0.6
   E. 0.5

5. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?

   A. 40%
   B. 25%
   C. 50%
   D. 80%
   E. 90%

6. Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?

   A. desirable
   B. economical
   C. essential
   D. optional
   E. uneconomical

7. Vacuum for reciprocating steam engines compared to steam turbines is__________________?

   A. more
   B. equal
   C. less
   D. could be more or less depending on the size of plant
   E. none of the above

8. The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________?

   A. wet
   B. superheated
   C. remain dry saturated
   D. dry
   E. none of the above

9. The steam temperature with increase in load in case of a boiler fitted with radiation super heater________________?

   A. increases
   B. decreases
   C. remains unaffected
   D. first increases and then decreases
   E. unpredictable

10. In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?

    A. remain unaffected
    B. improve C. worsen
    C. may improve/worsen depending on size
    D. unpredictable