Related Questions

Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?
A Long vertical evaporator
B Horizontal tube evaporator
C Agitated film evaporator
D Calenderia vertical tube evaporator
When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as
A Internally fired boiler
B Externally fired boiler
C Natural circulation boiler
D Forced circulation boiler
The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.
A Viscosity
B Density
C Thermal conductivity
D Corrosive nature
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator
A Is economical in operation
B Employs high velocity, high heat transfer rate and less heating surface requirement
C Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
D Both B & C
Q.(1-4): Answer the questions on the basis of the information given below. * F,G and H are insurance companies , Q,R,S and T are private detectives .Each detective works for at least one of the insurance companies. * Q always works for F and at least one of the other companies. Some of the time G employs only one of these detectives,' the rest of the time it employs exactly two of them. *F and H each employ exactly two of these detectives all the time. If R works for H only, and if S works for G and H only, T works for--
A F only
B G only
C H only
D both F and G
The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is
A More
B Less
C Same
D Could be more or less depending on other factors
When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as
A Internally fired boiler
B Externally fired boiler
C Natural circulation boiler
D Forced circulation boiler
In forced circulation type boiler
A Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
B Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
C Feed pump is employed to supplement natural circulation in water wall type furnace
D Water is converted into steam in one pass without any recirculation
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
A Blow off cock
B Fusible plug
C Stop valve
D Safety valve
If Arif works alone he will take 20 more hours to complete a task than if he works with Babu to complete the task. If Babu work alone, he will take 5 more hours to complete the task than if he works with Arif to complete the task. What is the ratio of the time taken by Arif to than taken by Babu if each of them works alone to complete the task?
A 2 : 1
B 5 : 3
C 7 : 5
D None of these

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