In water wall furnace, the heat is transferred to the water-walls by _________________?

Related Mcqs:

1. The ratio of heat utilised to produce steam and the heat liberated in furnace is known as___________________?

   A. boiler effectiveness
   B. boiler evaporative capacity
   C. factor of evaporation
   D. equivalent evaporation
   E. boiler efficiency

2. In regenerative air preheater, the heat is transferred _____________________?

   A. from a metal wall from one medium to another
   B. from heating an intermediateanaterial and then heating the air from this material
   C. by direct mixing
   D. heat is transferred by bleeding some gas from furnace
   E. none of the above

3. 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

4. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?

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

5. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?

   A. less
   B. more
   C. equal
   D. may be less or more depending on temperature
   E. unpredictable

6. The pressure at which latent heat of vaporisation of water is zero, is_________________?

   A. below atmospheric pressure
   B. 1 kg/cm2
   C. 100 kg/cm2
   D. 170 kg/cm2
   E. 225.6 kg/cm2

7. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is _________________?

   A. 0.83
   B. 0.6
   C. 0.4
   D. 0.3
   E. none of the above

8. The specific weight of water is 1000 kg/m”_________________?

   A. at normal pressure of 760 mm
   B. at 4°C temperature
   C. at mean sea level
   D. all the above
   E. none of the above

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. 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