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

Related Mcqs:

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

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

2. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?

   A. increases
   B. decreases
   C. remains unchanged
   D. increases/decreases depending on steam temperature requirements
   E. unpredictable

3. 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

4. The specific heat of superheated steam in kcal/kg is generally of the order of___________________?

   A. 0.1
   B. 0.3
   C. 0.5
   D. 0.8
   E. 1.0

5. The safety valve at superheater as compared to drum safety valve setting is set at___________________?

   A. higher value
   B. lower value
   C. same value
   D. any value
   E. none of the above

6. With increase in load, convection superheater has_______________________?

   A. drooping characteristic
   B. linear characterisstic
   C. rising characteristic
   D. flat characteristic
   C. none of the above

7. Pick up the correct statement as regards Cornish boiler and Lancashire boiler _______________?

   A. cornish is fire tube and lancashire is water tube
   B. cornish is water tube and lancashire is fire tube
   C. cornish has two fire tubes and lancashire has one
   D. lancashire has two fire tubes and cornish has one
   E. both have two fire tubes

8. The difference between cornish boiler and lancashire boiler is that_________________?

   A. former is fire tube type and latter is water tube type boiler
   B. former is water tube type and latter is fire tube type
   C. former contains one fire tube and latter contains two fire tubes
   E. none/of the above

9. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?

   A. more heating surface
   B. less heating surface
   C. equal heating surface
   D. heating surface depends on other parameters
   E. none of the above

10. Steam in water tube boiler as compared to fire tube boiler_________________?

    A. can be raised rapidly
    B. is raisd at slower rate
    C. is raised at same rate
    D. could be raised at fast/slow rate depending on design
    E. none of the above is true