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A series of multiple-choice questions and answers related to boiler water treatment, covering topics such as chemical carryover, mechanical carryover, feed systems, blowdown systems, and the role of various chemicals in boiler water treatment. It is a valuable resource for students studying power engineering or related fields, offering a practical approach to understanding key concepts and principles.
Typology: Exams
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Chemical carryover can be prevented by chemical injection, mud drum blowdown, and _____ ____. a) pure water b) boiler load c) continuous blowdown d) more chemicals - Answer-c A _________ feed system. This involves feeding the chemicals to the boiler system at the most efficient injection points and at a steady and continuous rate. a) closed bypass b) shot c) slug d) continuous - Answer-d Mechanical carryover can be prevented by careful boiler design and by operating the boiler within the design parameters for _______ level and firing rates. a) chemical b) water c) blowdown d) impurities - Answer-b Shot feeding involves the injection of chemicals over a relatively ______ period of time. a) long
b) intermittent c) short d) measured - Answer-c A significant improvement in _________ can be accomplished by recovering heat from the blowdown water and from its flash steam. a) control b) efficiency c) recovery d) chemical - Answer-b The two most common designs of chemical feed pumps are the___________, plunger- type and the electronic impulse-type. a) electric b) electronic c) reciprocating d) vibrating - Answer-c With the _________ feed system, it is common practice to mix one batch of chemicals per day. a) closed bypass b) shot c) slug d) continuous - Answer-d A simple blowdown system involves control that is totally reliant on the _______. a) effluent b) chemicals c) conductivity
d) operator - Answer-d ______ is particularly harmful as it forms a very hard deposit on turbine blades. a) carryover b) mist c) Silica d) Phosphate - Answer-c Control of the continuous blowdown flow, is ________ adjusted by the operator. a) manually b) automatically c) quickly d) slowly - Answer-a _________ is any solid, liquid or vaporous contaminants that leaves the boiler with the steam. a) Carryover b) Blowdown c) Feedwater d) Mist - Answer-a Chemical carryover is primarily caused by _________. a) foaming b) misting c) water d) load - Answer-a
Which of the following tests would need to be conducted in order to determine the total amount of all the dissolved materials that cause alkalinity in water? a) conductivity b) phenolphthalein alkalinity c) methyl orange test d) pH test - Answer-c Which is NOT likely to happen after addition of phosphate to boiler water? a) It will combine with dissolved solids in boiler water b) It will decrease the dissolved solids in boiler water c) It will increase the suspended solids in boiler water d) It will increase the pH of the boiler water - Answer-b What feed system requires the operator to mix a new batch of chemicals in a day tank each day? a) closed bypass feed system b) Continuous feed system c) shot feed system d) open bypass feed system - Answer-b How do you accurately check boiler water for dissolved solids? a) Filter the sample, then add sulphuric acid to neutralize the water b) Measure the "m" and "P" alkalinities c) Phenolphthalein is added to the sample to cause a blue colour to appear, neutralizing the water d) conductivity test - Answer-d Which of the following statements regarding the use of a pH meter is true? a) The voltage between the electrodes will vary according to the hydrogen ion concentration of the sample b) The voltage between the electrodes will vary inversely to the concentration of hydrogen ions c) The hydrogen ion concentration generates a current in the solution, which is measured and read in pH numbers
d) The voltage between the electrodes is not effected - Answer-a What is the main purpose of the continuous blow-down line that runs from the steam drum of a water tube boiler? a) Control the dissolved oxygen in the boiler water b) Heat the make-up water supplying a deaerator c) Control the quantity of dissolved salts within the boiler water d) Reduce the solids level of the boiler water by intermittent operation of the blow-off valves - Answer-c Which of the following is NOT an intended use for organics such as Tannins, Lignins, Starches, and synthetic polymers such as Sulphonated and Carboxylated polymers? a) reduce corrosion within the boiler b) prevent from attracting to each other to form larger particles c) coat suspended solids in the boiler water d) produce a non-sticky sludge in the boiler water - Answer-a Which of the following forms a hard deposit on turbine blades? a) Phosphate b) Chelate c) Sodium Hydroxide d) Silica - Answer-d By recovering heat from the blowdown water and from its flash steam you can greatly improve which aspect of operation? a) user friendly b) efficiency c) recovery d) control - Answer-b What is the purpose of hydrazine in high-pressure boilers? a) To eliminate erosion b) To control the dissolved solids c) To reduce effects of oxygen corrosion d) To prevent foaming - Answer-c