Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C__________________?

Related Mcqs:

1. Equivalent evaporation is the amount of water evaporated in a boiler from and at ____________________?

   A. 0°C
   B. 100°C
   C. saturation temperature at given pressure
   D. room temperature
   E. 20°C

2. The evaporation of 15.653 kg of water per hour from and at 100°C is called_________________?

   A. evaporative capacity
   B. factor of evaporation
   C. equivalent evaporation
   D. one boiler h.p.
   E. boiler efficiency

3. The equivalent evaporation of a boiler is a measure to compare _________________?

   A. the given boiler with the model
   B. the two different boilers of the same make
   C. two different makes of boilers operat¬ing under the same operating conditions
   D. two boilers of same make but operaing under different conditions
   E. any type of boilers operating under any conditions

4. Mechanical equivalent of heat for 1 kcal or Joule’s equivalent is equal to_________________?

   A. 421 kgm
   B. 421 kgm
   C. 539 kgm
   D. 102 kgm
   E. 75 kgm

5. 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

6. Deaeration of feed water is carried out because it reduces ____________________?

   A. cavitation of .boiler feed pumps
   B. corrosion caused by oxygen
   C. heat transfer coefficient
   D. pH value of water
   E. weight of water to be handled

7. Feed water conditioning in thermal power plants in done to__________________?

   A. reduce hardness and for removal of solids
   B. increase efficiency-of thermal power plant
   C. increase *heat transfer rate
   D. increase steam parameters
   E. all of the above

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

   A. centrifugal pump
   B. axial flow pump
   C. gear pump
   D. ejector pump
   E. reciprocating pump

9. 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

10. The feed check valve is used in order to ______________________?

    A. regulate flow of boiler water
    B. check level of water in boiler drum
    C. recirculate unwanted feed water
    D. allow high pressure feed water to flow to drum and not allow reverse flow to take place
    E. none of the above