In a throttling process_________________?

Related Mcqs:

1. During polytropic process_________________?

   A. heat transfer takes place across cylinder walls
   B. work is done
   C. steam may be wet, dry or superheated after expansion
   D. all of the above
   E. none of the above

2. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?

   A. horizontal straight line
   B. vertical straight line
   C. straight inclined line
   D. curved line
   E. none of the above

3. In a throttling process________________?

   A. steam temperature remaisn constant
   B. steam pressure remains constant
   C. steam enthalpy remains constant
   D. steam entropy remains constant
   E. steam volume remains constant

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

   A. and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2
   B. and its corresponding conversion into dry steam at desired boiler pressure
   C. conversion into steam at atmospheric condition
   D. conversion into steam at the same pres-sure at which feed water is supplied
   E. none of the above

6. 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

7. The water tubes in a babcock and wilcox boiler are__________________?

   A. horizontal
   B. vertical
   C. inclined
   D. horizontal and inclined
   E. vertical and inclined

8. Which type of boiler can meet rapid changes of load____________________?

   A. vertical fire tube type
   B. horizontal fire tube type
   C. horizontal water tube type
   D. vertical water tube type
   E. forced circulation type

9. The balanced draft furnace is one using _________________________?

   A. induced draft fan and chimney
   B. induced draft fan and forced draft fan
   C. forced draft fan and chimney
   D. any one of the above
   E. none of the above

10. Gusset stays in a boiler are provided to____________________?

    A. prevent the bulging of flat surfaces
    B. avoid explosion in furnace
    C. prevent leakage of hot flue gases
    D. support furnace freely from top
    E. prevent atmospheric air leaking into furnace