Duplex feed pumps are used in small steam boilers. These operate on the principle of_________________?

Related Mcqs:

1. A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are________________?

   A. supplied by same manufacturer loose and assembled at site
   B. supplied mounted on a single base
   C. purchased from several parties and packed together at site
   D. packaged boiler does not exist
   E. none of the above

2. The basic job of feed water treatment in boilers is to overcome the problem of __________________?

   A. corrosion
   B. scale
   C. carryover
   D. embrittlement
   E. all of the above

3. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?

   A. lancashire boiler
   B. locomotive boiler
   C. babcock and wilcox boiler
   D. cochran boiler
   E. benson boiler

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. Operation of McLeod gauge used for low pressure measurement is based on the principle of_________________?

   A. gas law
   B. Boyle’s law
   C. Charle’s law
   D. Pascal’s law
   E. McLeod’s law

9. Principle of similitude forms the basis of_________________?

   A. comparing two identical equipments
   B. designing models so that the result can be converted to prototypes
   C. comparing similarity between design and actual equipment
   D. hydraulic designs
   E. performing acceptance tests

10. Fire tube boilers are those in which__________________?

    A. flue gases pass through tubes and water around it
    B. water passes through the tubes and flue gases around it
    C. forced circulation takes place
    D. tubes are laid vertically
    E. none of the above