Q.1
What are modes of heat transfer in evaporators?
  • a) Conduction and convention
  • b) Conduction and radiation
  • c) Radiation and convention
  • d) Conduction, convention, radiation
Q.2
What controls the overall heat transfer coefficient in falling film evaporators?
  • a) Film thickness
  • b) Velocity
  • c) Liquid properties
  • d) Film thickness, velocity, liquid properties
Q.3
What is the cause of convection heat transfer in evaporators?
  • a) Convection is heat transfer by neutrons
  • b) Convection is heat transfer by mass motion of a heat source
  • c) Convection is mass transfer by mass motion of a fluid
  • d) Convection is heat transfer by mass motion of a fluid
Q.4
What is conduction?
  • a) Conduction is heat transfer by means of molecular agitation
  • b) Conduction is mass transfer by means of molecular agitation
  • c) Conduction is heat transfer by means of electron agitation
  • d) Conduction is heat transfer by means of atom agitation
Q.5
What is evaporation?
  • a) Process of substance in a liquid state changing to a gaseous state
  • b) Process of substance in a solid state changing to a gaseous state
  • c) Process of substance in a liquid state changing to a solid state
  • d) Process of substance in a gaseous state changing to a liquid state
Q.6
Which of the following statements about rate of evaporationare correct?
  • a) True, False
  • b) True, True
  • c) False, True
  • d) False, False
Q.7
What are the principle functions of evaporator?
  • a) Heat exchanger and separator
  • b) Heat exchanger
  • c) Heat exchanger
  • d) Evaporate
Q.8
What is meant by heat transfer coefficient?
  • a) The heat transfer coefficient is the heat transferred per unit volume per kelvin
  • b) The heat transfer coefficient is the heat transferred per unit area per kelvin
  • c) The heat transfer coefficient is the heat transferred per unit volume per Celsius
  • d) The heat transfer coefficient is the heat transferred per unit area per Celsius
Q.9
How do you increase heat transfer coefficient?
  • a) By increasing Reynolds number
  • b) By decreasing Reynolds number
  • c) By increasing velocity
  • d) By increasing Reynolds number and velocity
Q.10
What factors affect heat transfer coefficient?
  • a) Viscosity, density, specific heat
  • b) Viscosity
  • c) Density
  • d) Specific heat
0 h : 0 m : 1 s