E-PolyLearning

1. Boiling refers to a change from the
a. Solid to a liquid phase
b. Vapor to a liquid phase
c. Liquid to a solid phase
d. Liquid to a vapor phase
View Answer Report Discuss 50-50!
Answer: (d).Liquid to a vapor phase

2. The boiling process has wide-spread applications in

(i) Production of steam in nuclear and steam power plants for generation and for industrial processes and space heating
(ii) Absorption of heat in refrigeration and air-conditioning systems
(iii) Concentration, dehydration and drying of foods and materials

Identify the correct statements
a. 1 and 2
b. 2 and 3
c. 1, 2 and 3
d. 1 and 3
View Answer Report Discuss 50-50!
Answer: (c).1, 2 and 3

3. Maximum heat transfer rate in a modern boiler is about
a. 2 * 10⁵ W/m²
b. 3 * 10⁵ W/m²
c. 4 * 10⁵ W/m²
d. 5 * 10⁵ W/m²
View Answer Report Discuss 50-50!
Answer: (a).2 * 10⁵ W/m²

4. Which type of boiling occurs in steam boilers employing natural convection?
a. Forced convection
b. Pool
c. Local
d. Saturated
View Answer Report Discuss 50-50!
Answer: (b).Pool

5. In which type of boiling the fluid motion is induced by external means?
a. Pool
b. Local
c. Forced convection
d. Subcooled
View Answer Report Discuss 50-50!
Answer: (c).Forced convection

Page 1 of 13